JP2001007809A - Intra-channel multiplex switching system - Google Patents

Abstract

(57) [Summary] [Problem] To construct a network with high cost performance. An ATM access node has a correspondence table between a layer 3 address of a terminal and an ATM access node to which the terminal is connected, and when encapsulating data from the terminal in an AAL5 layer, a transmission destination layer. 3 address is written in the user data section 30 of the CPCS-PDU of the AAL5, and the data is transferred to a VC (virtual channel) of the public ATM network
And multiplex it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ATM (Asy)
In an nchronous transfer mode (asynchronous transfer mode) communication system, data from a plurality of terminals is transferred to a virtual channel (VC).
The present invention relates to an intra-channel multiplexing switching system for multiplexing and transmitting data on a virtual channel.

[0002]

2. Description of the Related Art FIG. 17 shows "Nikkei Communication".
(Nikkei BP 1999.2.1 No. 287) 10
FIG. 3 is a diagram showing a network configuration in a conventional ATM communication system shown in FIG. 3-3 on page 4, in which 10a to 10h are terminals, 11a to 11h are lines of the terminals 10a to 10h, 12a to 12h. 12d is each line 1
It is an ATM access node connected to each terminal 10a to 10h via 1a to 11h.

In FIG. 17, reference numeral 13 denotes a public ATM.
174 a to 174 d are VPs (Virtual Paths) connecting the ATM access nodes 12 a to 12 d in the public ATM network 13.
174a connects the ATM access nodes 12a and 12b, and 174b connects the ATM access nodes 12b and 12c.
, 174c are ATM access nodes 12c and 12d
And 174d connect the ATM access nodes 12d and 12a, respectively. As described above, when there are a plurality of ATM access nodes 12a to 12d, a network is constructed by connecting the ATM access nodes 12a to 12d by VP.

Next, the operation will be described. When the terminal 10a transmits data to the terminal 10c, the terminal 10a transmits data to the ATM access node 12a using the line 11a. ATM access node 12a is a VP 174
The received data is transmitted to the ATM access node 12b using the VC set between the terminal 10a and the terminal 10c in FIG. ATM access node 12b is connected to line 11c
To transmit the received data to the terminal 10c.

When the terminal 10a transmits data to the terminal 10d, the terminal 10a uses the line 11a to transmit
The data is transmitted to the M access node 12a. The ATM access node 12a transmits the received data to the ATM access node 12b using another VC set between the terminal 10a and the terminal 10d in the VP 174a. AT
The M access node 12b communicates with the terminal 1 using the line 11c.
The received data is transmitted to 0d.

[0006]

Since the network configuration in the conventional ATM communication system is configured as described above, communication can be realized if VPs 174a to 174d are set between the ATM access nodes 12a to 12d. There is a problem that the connection cost at １７174d is much higher than VC, and the cost performance is extremely low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a cost-effective intra-channel multiplex switching system in a network configuration in an ATM communication system.

[0008]

An intra-channel multiplex switching system according to the present invention is an ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal. It has a correspondence table between the layer 3 address of the terminal and the ATM access node to which the terminal is connected, and when encapsulating data from the terminal in the AAL5 layer, the data format of the CPCS-PDU of the AAL5 is used. The layer 3 address is written, and the data is multiplexed and transmitted to the VC of the public ATM network.

[0009] An intra-channel multiplex switching system according to the present invention is an ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal.
It has a correspondence table between the address and the ATM access node to which the terminal is connected.
When converting to an M cell, the layer 3 address is written in the data format of the ATM cell, and the data is multiplexed and transmitted to the VC of the public ATM network.

In the intra-channel multiplex switching system according to the present invention, a layer 3 address is written in an ATM cell information field in an ATM cell data format.

[0011] The intra-channel multiplex switching system according to the present invention is an ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal.
A correspondence table between the address and the ATM access node to which the terminal is connected;
When making a short cell in the L2 layer, the AAL2
The above-mentioned data format is written in the layer 3 address, and the data is multiplexed and transmitted to the VC of the public ATM network.

In the intra-channel multiplex switching system according to the present invention, a layer 3 address is written in a data portion in an AAL2 data format.

According to the intra-channel multiplex switching system of the present invention, in an ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal, the ATM access node sets a terminal to which data is to be transmitted. When the data from the terminal is encapsulated in the AAL5 layer, the SCCI is written in the data format of the CPCS-PDU of the AAL5, and the data is stored in the public ATM network. Multiplexed to the VC.

According to the intra-channel multiplex switching system of the present invention, in an ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal, the ATM access node transmits data to a terminal to which the data is sent. The SCCI of the designated layer 1 sub-channel is determined by signaling, and the data from the terminal is transmitted to AAL5.
When encapsulating with the layer of AAL5, CPC of AAL5
Write the above SCCI in the format of S-PDU,
The data is multiplexed and transmitted to the VC of the public ATM network.

According to the intra-channel multiplex switching system of the present invention, in an ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal, the ATM access node transmits data to a terminal to which the data is sent. The SCCI of the designated layer 1 sub-channel is determined by signaling, and when converting the data from the terminal into an ATM cell, the SCCI is written in the data format of the ATM cell, and the data is converted to the public ATM.
This is multiplexed and transmitted to the VC of the network.

In the intra-channel multiplex switching system according to the present invention, the SCI is written in an ATM cell information field in an ATM cell data format.

An intra-channel multiplex switching system according to the present invention is an ATM communication system in which an ATM access node connected to a public ATM network using a signaling VC and a user data VC transmits data from a terminal. The ATM access node determines, by signaling, the SCI of a layer 1 sub-channel designating a terminal to which data is to be sent, and transmits data from the terminal to the AAL.
When short cells are formed in the second layer, the SCCI is written in the data format of the AAL2, and the data is multiplexed and transmitted to a VC for user data in the public ATM network.

In the intra-channel multiplex switching system according to the present invention, the SCI is written in the data portion in the AAL2 data format.

An intra-channel multiplex switching system according to the present invention is an ATM communication system in which an ATM access node connected to a public ATM network using a signaling VC and a user data VC transmits data from a terminal. When the ATM access node encapsulates the signaling data at the AAL5 layer, the AA
In the L5 data format, write the SCCI of the layer 1 sub-channel designating the destination terminal of the data,
A connection for data is set by multiplexing and transmitting the signaling data to a signaling VC of the public ATM network.

In the intra-channel multiplex switching system according to the present invention, the SCI is written in the user data portion in the data format of the AAL5 CPCS-PDU.

[0021] The intra-channel multiplex switching system according to the present invention is an ATM communication system in which an ATM access node connected to a public ATM network having a plurality of VCs corresponding to service classes transmits data from terminals. The node has a correspondence table between the layer 3 address of the terminal and the ATM access node to which the terminal is connected, and when encapsulating data from the terminal in the AAL5 layer, the CPCS-of the AAL5
The layer 3 address is written in the data format of the PDU, and the data is multiplexed and transmitted to the VC of the public ATM network in accordance with the service class assigned to each terminal.

[0022] The intra-channel multiplex switching system according to the present invention relates to an ATM communication system in which an ATM access node connected to a public ATM network having a plurality of VCs corresponding to service classes transmits data from terminals. The node has a correspondence table between the layer 3 address of the terminal and the ATM access node to which the terminal is connected, and when encapsulating data from the terminal in the AAL5 layer, the CPCS-of the AAL5
The layer 3 address is written in the data format of the PDU, and the data is multiplexed and transmitted to the VC of the public ATM network in accordance with the service class assigned to the TOS of the data.

In the intra-channel multiplex switching system according to the present invention, a layer 3 address is written in a user data portion in a data format of a CPCS-PDU of an AAL5 layer.

In the intra-channel multiplex switching system according to the present invention, the layer 3 address is composed of a node ID designating each ATM access node and a terminal ID designating each terminal.

According to the intra-channel multiplex switching system of the present invention, in an ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal, the ATM access node is adapted to assemble / assemble the data cell. VC multiplexing is performed by adding a CLAD for performing disassembly, an ATM switch having an ATM cell header conversion function and a traffic control function, and a layer 3 address of the terminal or an SCCI of a layer 1 subchannel designating a terminal to which data is to be transmitted. And a VC multiplexing / demultiplexing unit.

According to the intra-channel multiplex switching system of the present invention, an ATM access node connected to a public FR network comprises:
In an ATM communication system for transmitting data from a terminal using DLC of the public FR network, the ATM access node performs C / A for assembling / disassembling the cells of the data.
The ATM switch having the LAD, the ATM cell header conversion function and the traffic control function, and the DLCI of the FR are determined from the VP of the ATM, and the SCCI of the FR is determined from the VC of the ATM. And an ATM-FR address conversion unit for performing address conversion of the ATM,
The DLCI determined by the FR address translator and the S
Write the CCI and replace the data with the DLC of the public FR
And a DLC multiplexing / demultiplexing unit for multiplexing and transmitting.

In the intra-channel multiplex switching system according to the present invention, the DLCI is written in the address field in the FR data format, and the SCCI is written in the information field.
Is written.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 shows A according to Embodiment 1 of the present invention.
It is a figure which shows the network structure in a TM communication system, In the figure, 10a-10f is a terminal, 11a-1
1f is a line of each of the terminals 10a to 10f, and 12a to 12c is an ATM access node connected to each of the terminals 10a to 10f via each of the lines 11a to 11f.

In FIG. 1, reference numeral 13 denotes a public ATM network, and reference numeral 14a denotes ATM access nodes 12a and 12b in the public ATM network 13, for example, PVC (Per
manent Virtual Connection
n) VC connected by the method, and 14b is a public AT
ATM access nodes 12b and 12c in M network 13
Are, for example, VCs connected by a PVC method. This P
According to the VC method, each of the ATM access nodes 12a to 12a
During the period c, a connection is constantly set regardless of the presence or absence of data transmission.

FIG. 2 shows terminal 10a according to the first embodiment.
"Node ID + terminal ID" which is a layer 3 address of 10 to 10f, and ATM connected to each terminal 10a to 10f
It is a figure showing a correspondence table with access nodes 12a-12c. For example, the terminal 10a has a layer 3 address of “1” as the node ID and “1” as the terminal ID, and
This indicates that the connection is made to the TM access node 12a.

FIG. 3 shows AAL5 (AT) according to the first embodiment.
M Adaptation Layer Type
5) CPCS-PDU (Common Pa) of the layer
rtConvergence Sublayer-Pr
3 is a diagram illustrating a data format of an O.O.C.O. (Autocol Data Unit) and a newly defined layer 3 address field. In the figure, reference numeral 30 denotes a user data portion in which user data is stored, 31 denotes a variable-length padding (PAD) field of a maximum of 47 bytes, and 32 denotes a 1-byte UU (User to User) field.
It is transmitted transparently between AL5 CPCS users.

In FIG. 3, reference numeral 33 denotes a 1-byte C
PI (Common Part Indicator)
The field 34 is a length (Len) indicating the user data length.
gth) field 35 is a 4-byte CRC-32 field, which is a CRC (Cyclic Redundancy) calculated for the entire contents of the CPCS-PDU.
y Check). 36 is a newly defined layer 3 address field using the first 4 bytes of the user data section 30.

Next, the operation will be described. In FIG. 1, when the terminal 10a transmits data to the terminal 10e, the terminal 10a transmits data to the ATM access node 12a using the line 11a. AT that received the data
The M access node 12a determines the partner node ID and the partner terminal ID from the slot position of the transmitting terminal, and determines from the correspondence table shown in FIG.
Is known to be the terminal 10e connected to.

Then, the ATM access node 12a
When the data from the terminal 10a is encapsulated in the AAL-5 layer, the layer 3 address field 36 shown in FIG.
Then, the “node ID + terminal ID” of the terminal 10e is written into the node, and the data is multiplexed on the VC 14a and transmitted to the ATM access node 12b.

At the ATM access node 12b, the layer 3 address field 36 of the received CPCS-PDU is
Is read from the correspondence table shown in FIG.
It is determined that the terminal 10e is connected to the M access node 12c. And the ATM access node 12
b multiplexes the data on the VC 14b and sends it to the ATM access node 12c.

At the ATM access node 12c, the layer 3 address field 36 of the received CPCS-PDU is
Is read, and the destination terminal is the ATM access node 12c.
It is determined that the terminal 10e is connected to the terminal 10e, and data is transmitted to the terminal 10e using the line 11e.

Similarly, when the terminal 10b in FIG. 1 transmits data to the terminal 10c, the terminal 10b transmits data to the ATM access node 12a using the line 11b.
The ATM access node 12a that has received the data determines “node ID + terminal ID” of the terminal 10c from the slot position of the transmitting terminal, and the destination terminal is connected to the ATM access node 12b according to the correspondence table shown in FIG. Terminal 10
know that it is c.

Then, the ATM access node 12a
When the data from the terminal 10b is encapsulated in the AAL-5 layer, the layer 3 address field 36 shown in FIG.
Write the “node ID + terminal ID” of the terminal 10c in
ATM access node 1 multiplexes data to VC 14a
2b.

At the ATM access node 12b, the layer 3 address field 36 of the received CPCS-PDU is
Is read, and the destination terminal is the ATM access node 12b.
It is determined that the terminal 10c is connected to the terminal 10c, and data is transmitted to the terminal 10c using the line 11c. With the above processing, data from a plurality of terminals are multiplexed into one VC, and intra-channel multiplex exchange is performed. As described above, this embodiment realizes a connectionless service in which a data transmission destination is identified by a layer 3 address, that is, in a layer lower than that, data is transmitted without being aware of a connection.

As described above, according to the first embodiment, the destination layer 3 address is set to the AAL5 layer C
By assigning each PCS-PDU, VC14a,
Even if data from a plurality of terminals 10a to 10f are multiplexed on the 14b, the destination can be identified and intra-channel multiplexing can be performed.
By constructing a network by connecting with C14a and 14b, an effect is obtained that the network cost can be greatly reduced as compared with a case where the ATM access nodes 12a to 12c are connected by VP.

Embodiment 2 A according to the second embodiment
The network configuration in the TM communication system is the same as that shown in FIG. 1 of the first embodiment. FIG. 4 is a diagram showing a data format of an ATM cell and a newly defined layer 3 address field according to the second embodiment. In the figure, 40 is a 5-byte ATM cell header,
VPI (Virtual Path Identifier)
er), VCI (Virtual Channel I)
(dentifier) field and the like. 41
Is a 48-byte ATM cell information field in which user data is stored. Reference numeral 42 denotes a layer 3 address field using the first 4 bytes of the ATM cell information field 41.

Next, the operation will be described. In FIG. 1, when the terminal 10a transmits data to the terminal 10e, the terminal 10a transmits data to the ATM access node 12a using the line 11a. AT that received the data
The M access node 12a determines the partner node ID and the partner terminal ID from the slot position of the transmitting terminal, and determines from the correspondence table shown in FIG.
Is known to be the terminal 10e connected to.

Then, the ATM access node 12a
When converting data from the terminal 10a into ATM cells, FIG.
The “node ID + terminal ID” of the terminal 10e is written in the layer 3 address field 42 of the
4a and transmitted to the ATM access node 12b.

The ATM access node 12b reads the layer 3 address field 42 of the received cell,
From the correspondence table shown in FIG. 2, it is determined that the destination terminal is the terminal 10e connected to the ATM access node 12c. Then, the ATM access node 12b multiplexes the data on the VC 14b and transmits the multiplexed data to the ATM access node 12c.

The ATM access node 12c reads the layer 3 address field 42 of the received cell,
It determines that the destination terminal is the terminal 10e connected to the ATM access node 12c, and transmits data to the terminal 10e using the line 11e.

Similarly, also in the case where the terminal 10b of FIG. 1 transmits data to the terminal 10c, the data is multiplexed on the same VC 14a and transmitted. With the above processing, data from a plurality of terminals are multiplexed into one VC, and intra-channel multiplex exchange is performed. As described above, this embodiment realizes a connectionless service in which a data transmission destination is identified by a layer 3 address, that is, in a layer lower than that, data is transmitted without being aware of a connection.

As described above, according to the second embodiment, a plurality of terminals 10a to 14b are assigned to VCs 14a and 14b by assigning a destination layer 3 address to each ATM cell.
Even if data from 10f is multiplexed, it is possible to identify the transmission destination and perform intra-channel multiplex exchange. Therefore, when constructing the ATM communication system, the network is constructed by connecting with the VCs 14a and 14b. As compared with the case where the ATM access nodes 12a to 12c are connected by VP, the effect that the network cost can be greatly reduced can be obtained.

Embodiment 3 A according to the third embodiment
The network configuration in the TM communication system is the same as that shown in FIG. 1 of the first embodiment. FIG. 5 is a diagram showing an AAL2 data format and a newly defined layer 3 address field according to the third embodiment. In the figure, reference numeral 40 denotes the same 5-byte ATM cell header as that shown in FIG. 4 of the second embodiment, and includes VPI, VCI fields and the like.

In FIG. 5, reference numeral 51 denotes a 1-byte S
TF (Start Field) and OSF (Of
fset Field). Reference numeral 52 denotes a short cell, which is a 3-byte CPS (Common Pa).
(rt Sublayer) packet header 53 and a data part 54. Reference numeral 55 denotes a layer 3 address field using the first 4 bytes of the data section 54.

Next, the operation will be described. In FIG. 1, when the terminal 10a transmits data to the terminal 10e, the terminal 10a transmits data to the ATM access node 12a using the line 11a. AT that received the data
The M access node 12a determines the partner node ID and the partner ID from the slot position of the transmitting terminal, and learns from the correspondence table shown in FIG. 2 that the destination terminal is the terminal 10e connected to the ATM access node 12c. .

Then, the ATM access node 12a
When the data from the terminal 10a is converted into a short cell in the AAL-2 layer, the “node ID + terminal ID” of the terminal 10e is written in the layer 3 address field 55 of FIG. 5, and the data is multiplexed to the VC 14a to perform ATM access. Send to node 12b.

The ATM access node 12b reads the layer 3 address field 55 of the received short cell and determines from the correspondence table shown in FIG. 2 that the destination terminal is the terminal 10e connected to the ATM access node 12c. I do. And the ATM access node 12b
Multiplexes the data on the VC 14b and sends it to the ATM access node 12c.

The ATM access node 12c reads the layer 3 address field 55 of the received short cell and determines that the destination terminal is the terminal 10e connected to the ATM access node 12c.
The data is transmitted to the terminal 10e using e.

Similarly, when the terminal 10b shown in FIG. 1 transmits data to the terminal 10c, the data is multiplexed on the same VC 14a and transmitted. With the above processing, data from a plurality of terminals are multiplexed into one VC, and intra-channel multiplex exchange is performed. As described above, this embodiment realizes a connectionless service in which a data transmission destination is identified by a layer 3 address, that is, in a layer lower than that, data is transmitted without being aware of a connection.

As described above, according to the third embodiment, data from a plurality of terminals 10a to 10f is multiplexed to VCs 14a and 14b by assigning a destination layer 3 address to each AAL2 short cell. However, since the intra-channel multiplex exchange can be performed by identifying the transmission destination, the VC 14a,
By connecting at 14b and building a network,
As compared with the case where the ATM access nodes 12a to 12c are connected by VP, the effect that the network cost can be greatly reduced can be obtained.

Embodiment 4 A according to the fourth embodiment
The network configuration in the TM communication system is the same as that shown in FIG. 1 of the first embodiment. FIG. 6 is a diagram showing a data format of an AAL5 CPCS-PDU and a newly defined layer 1 subchannel field according to the fourth embodiment. In the figure, reference numeral 66 denotes a layer 1 sub-channel field using the first 4 bytes of the user data section 30. Others are the same as those shown in FIG. 3 of the first embodiment.

Next, the operation will be described. In FIG. 1, when the terminal 10a transmits data to the terminal 10e, the terminal 10a transmits data to the ATM access node 12a using the line 11a. AT that received the data
When encapsulating with AAL5, the M access node 12a adds
An SCCI (Short Cell C), which is a transmission destination layer 1 sub-channel that specifies a data transmission destination terminal
A channel identifier (short cell channel identifier) is written, and the data is multiplexed on the VC 14a and transmitted to the ATM access node 12b. here,
It is assumed that the ATM access node 12a has the SCI.

The ATM access node 12b receives not only the VPI and VCI at the time of reception, but also the received CPCS-PD.
It reads the SCCI of the U layer 1 subchannel field 66, multiplexes the data into the VC 14b, and sends it to the ATM access node 12c.

In the ATM access node 12c, not only the VPI and VCI at the time of reception but also the received CPCS-P
SCI of layer 1 subchannel field 66 of DU
Is read, and data is transmitted to the terminal 10e using the line 11e.

Similarly, when the terminal 10b shown in FIG. 1 transmits data to the terminal 10c, the data is multiplexed on the same VC 14a and transmitted. With the above processing, data from a plurality of terminals are multiplexed into one VC, and intra-channel multiplex exchange is performed. As described above, this embodiment realizes a connection-oriented service for identifying a data transmission destination by using the SCI, which is a layer 1 sub-channel, that is, transmitting data in consideration of a layer 1 connection. .

As described above, according to the fourth embodiment, the SCCI that is the destination layer 1 sub-channel is
By assigning each CPCS-PDU, VC14
Even if data from a plurality of terminals 10a to 10f are multiplexed on the terminals a and 14b, the transmission destination can be identified and intra-channel multiplex exchange can be performed. By constructing a network, the ATM access nodes 12a to 12c
The effect that the network cost can be greatly reduced as compared with the case where the connection is established by VP is obtained.

Embodiment 5 A according to the fifth embodiment
The network configuration in the TM communication system is the same as that shown in FIG. 1 of the first embodiment. In this embodiment, signaling for setting up a connection with a transmission destination is performed, and after the connection is set up, data is transmitted using the data format of the CPCS-PDU of AAL5 shown in FIG. Is transmitted.

Next, the operation will be described. In FIG. 1, when the terminal 10a transmits data to the terminal 10e, the ATM access node 12a uses signaling to transmit the data to the ATM access node 12b via the VC 14a.
Then, a sub-connection is set up in the VCs 14a and 14b to the ATM access node 12c via the VC 14b and an SCCI (short cell channel identifier) at the time of data transfer is determined.

Then, the terminal 10a transmits data to the ATM access node 12a by using the line 11a, and the ATM access node 12a, which has received the data, performs the encapsulation in the AAL5 layer when the data is encapsulated in the AAL5 layer. The SCCI obtained by using the above signaling is written in the field 66, and the data is multiplexed to the VC 14a and transmitted to the ATM access node 12b by using the sub-connection in the VC 14a.

In the ATM access node 12b, not only the VPI and VCI at the time of reception but also the received CPCS-P
SCI of layer 1 subchannel field 66 of DU
Is read, the data is multiplexed on the VC 14b and transmitted to the ATM access node 12c by using the sub-connection in the VC 14b.

At the ATM access node 12c, not only the VPI and VCI at the time of reception but also the received CPCS-P
SCI of layer 1 subchannel field 66 of DU
Is read from the terminal 10e using the line 11e.
Send data to.

Similarly, when the terminal 10b in FIG. 1 transmits data to the terminal 10c, the data is transmitted using the sub-connection in the VC 14a. With the above processing, data from a plurality of terminals are multiplexed into one VC, and intra-channel multiplex exchange is performed. As described above, this embodiment realizes a connection-oriented service for identifying a data transmission destination by using the SCI, which is a layer 1 sub-channel, that is, transmitting data in consideration of a layer 1 connection. .

As described above, according to the fifth embodiment, a plurality of VCCIs 14a and 14b are assigned to the VCs 14a and 14b by assigning the SCCI which is the layer 1 subchannel of the transmission destination obtained using the signaling to each CPCS-PDU. Terminals 10a-
Even if data from 10f is multiplexed, it is possible to identify the transmission destination and perform intra-channel multiplex exchange. Therefore, when constructing the ATM communication system, the network is constructed by connecting with the VCs 14a and 14b. As compared with the case where the ATM access nodes 12a to 12c are connected by VP, the effect that the network cost can be greatly reduced can be obtained.

Embodiment 6 FIG. A according to the sixth embodiment
The network configuration in the TM communication system is the same as that shown in FIG. 1 of the first embodiment. FIG. 7 is a diagram showing an ATM cell data format and a newly defined layer 1 sub-channel field according to the sixth embodiment. In the figure, reference numeral 72 denotes an ATM cell information field 41.
Is a layer 1 sub-channel field using the first 4 bytes of the second embodiment, and the rest is the same as FIG. 4 of the second embodiment.

Next, the operation will be described. In FIG. 1, when the terminal 10a transmits data to the terminal 10e, the ATM access node 12a performs signaling and transmits the signaling to the ATM access node 12b via the VC 14a and to the ATM access node 12 via the VC 14b.
A sub-connection is set in each of the VCs 14a and 14b up to c, and an SCID (short cell channel identifier) at the time of data transfer is determined.

Then, the terminal 10a transmits data to the ATM access node 12a by using the line 11a, and the ATM access node 12a, which has received the data, converts the data into an ATM cell when converting the cell into the layer 1 subchannel field 7 shown in FIG.
2, the SCCI obtained by performing the above signaling is written, and the data is multiplexed on the VC 14a and transmitted to the ATM access node 12b by using the sub-connection in the VC 14a.

At the ATM access node 12b, not only the VPI and VCI at the time of reception but also the received CPCS-P
SCI of DU layer 1 subchannel field 72
Is read, the data is multiplexed on the VC 14b and transmitted to the ATM access node 12c by using the sub-connection in the VC 14b.

At the ATM access node 12c, not only the VPI and VCI at the time of reception but also the received CPCS-P
SCI of DU layer 1 subchannel field 72
Is read from the terminal 10e using the line 11e.
Send data to.

Similarly, when the terminal 10b of FIG. 1 transmits data to the terminal 10c, the data is multiplexed on the same VC 14a and transmitted. With the above processing, data from a plurality of terminals are multiplexed into one VC, and intra-channel multiplex exchange is performed. As described above, this embodiment realizes a connection-oriented service for identifying a data transmission destination by using the SCI, which is a layer 1 sub-channel, that is, transmitting data in consideration of a layer 1 connection. .

As described above, according to the sixth embodiment, a plurality of terminals 10a are provided to VCs 14a and 14b by adding, to each ATM cell, the SCI, which is the layer 1 sub-channel of the transmission destination obtained by using signaling. Even if data from to 10f are multiplexed, it is possible to identify the transmission destination and perform intra-channel multiplex exchange. Therefore, when constructing the ATM communication system, the network is constructed by connecting with the VCs 14a and 14b. , ATM access node 2
The effect that the network cost can be greatly reduced as compared with the case where the connection between a to 12c is connected by VP is obtained.

Embodiment 7 FIG. 8 is a diagram showing a network configuration in an ATM communication system according to Embodiment 7 of the present invention. In the figure, reference numeral 84a denotes a signaling VC for connecting ATM access nodes 12a and 12b by, for example, a PVC method, and 84b denotes an ATM. The signaling VC 84c for connecting the access nodes 12b and 12c by, for example, the PVC method is an ATM access node 12c.
VCs for user data that connect a and 12b by, for example, a PVC system, 84d are ATM access nodes 12b and 1d.
2c is a VC for user data connected by, for example, a PVC method, and the other is the same as FIG. 1 of the first embodiment.

FIG. 9 is a diagram showing an AAL2 data format and a newly defined layer 3 address field according to the seventh embodiment. In the figure, 95 is the data part 5
4 is a layer 1 sub-channel field using the first 4 bytes, and the rest is the same as FIG. 5 of the third embodiment.

Next, the operation will be described. In FIG. 8, when the terminal 10a transmits data to the terminal 10e, the ATM access node 12a uses signaling to transmit the data to the ATM access node 12b via the VC 84a.
Then, a sub-connection is set in the VC 84c and the VC 84d up to the ATM access node 12c via the VC 84b and the SCID (short cell channel identifier) at the time of data transfer is determined.

Then, the terminal 10a transmits data to the ATM access node 12a using the line 11a, and the ATM access node 12a receiving the data transmits the data to the AAL2.
When short cell is performed in the layer of FIG.
The SCCI obtained by using the above signaling is written in the sub-channel field 95, and the data is multiplexed to the VC 84c and transmitted to the ATM access node 12b by using the sub-connection in the VC 84c.

In the ATM access node 12b, not only the VPI and VCI at the time of reception but also the SCCI of the layer 1 sub-channel field 95 of the received short cell are read, and the data is used by using the sub-connection in the VC 84d. AT multiplexed with VC84d
Transmit to the M access node 12c.

The ATM access node 12c transmits data to the terminal 10e using the line 11e from the result of reading not only the VPI and VCI at the time of reception but also the SCCI of the layer 1 sub-channel field 95 of the received short cell. .

Similarly, also in the case where the terminal 10b in FIG. 8 transmits data to the terminal 10c, the data is multiplexed on the same VC 14a and transmitted. With the above processing, data from a plurality of terminals are multiplexed into one VC, and intra-channel multiplex exchange is performed. As described above, this embodiment realizes a connection-oriented service for identifying a data transmission destination by using the SCI, which is a layer 1 sub-channel, that is, transmitting data in consideration of a layer 1 connection. .

As described above, according to the seventh embodiment, when a signaling VC and a user data VC are separately present, the SCCI which is a layer 1 sub-channel of a transmission destination obtained by using signaling is used. Is assigned to each short cell in the AAL2 layer, so that VC14
Even if data from a plurality of terminals 10a to 10f are multiplexed on the terminals a and 14b, the transmission destination can be identified and intra-channel multiplex exchange can be performed. By constructing a network, the ATM access nodes 12a to 12c
The effect that the network cost can be greatly reduced as compared with the case where the connection is established by VP is obtained.

Embodiment 8 FIG. A according to the eighth embodiment
The network configuration in the TM communication system is the same as that shown in FIG. 8 of the seventh embodiment. In this embodiment, signaling data is transmitted using the data format of the CPCS-PDU of AAL5 shown in FIG.

Next, the operation will be described. In FIG. 8, in order for the terminal 10a to transmit data to the terminal 10e, the ATM access node 12a sets the VC 84c and the VC 84d by using signaling, and sets a data connection to the ATM access node 12c. In this case, the ATM access node 12a performs encapsulation in the AAL5 layer when transmitting the signaling data.

In the ATM access node 12a, this A
When performing encapsulation in AL5, SCCI (short cell channel identifier) is written in the layer 1 sub-channel field 66 of FIG.
4a and transmitted to the ATM access node 12b.

The ATM access node 12b that has received the signaling data sets the SCCI in the layer 1 subchannel field 66 to set up a data connection with the ATM access node 12c, multiplexes the signaling data into the VC 84b, and performs the ATM access. Send it to node 12c.

The ATM access nodes 12c to 1
Also when transmitting signaling data to 2b, the signaling data is encapsulated in the AAL5 layer, the SCI is written in the layer 1 sub-channel field 66, the signaling data is multiplexed on the VC 84b, and transmitted to the ATM access node 12b.

The ATM access node 12b that has received the signaling data, based on the SCI of the layer 1 sub-channel field 66, transmits this signaling data to the VC 84
c and VC84d to determine that a subconnection is to be set. ATM access node 12
b is the SCCI in the layer 1 subchannel field 66
Is set, and the signaling data is multiplexed on the VC 84a and transmitted to the ATM access node 12a.

The ATM access node 12a, which has received the signaling data, determines that the signaling data is VC84 based on the SCI of the layer 1 sub-channel field 66.
c and VC84d, and determines that the sub-connection is to be established in the ATM access node 12.
Data connection up to c can be set. As described above, this embodiment realizes a connection-oriented service for identifying a data transmission destination by using the SCI, which is a layer 1 sub-channel, that is, transmitting data in consideration of a layer 1 connection. .

As described above, according to the eighth embodiment, when signaling VCs 84a to 84b and user data VCs 84c to 84d are separately provided, the destination layer 1 subchannel Is assigned to each of the AAL5 CPCS-PDUs, so that even if signal data from a plurality of terminals 10a to 10f are multiplexed on the VCs 84a and 84b, it is possible to identify the transmission destination and perform intra-channel multiplexing. When constructing an ATM communication system, VC84
By constructing a network by connecting at a and 84b, there is an effect that the network cost can be significantly reduced as compared with a case where the ATM access nodes 12a to 12c are connected by VP.

Embodiment 9 FIG. FIG. 10 is a diagram showing a network configuration in an ATM communication system according to a ninth embodiment of the present invention. In the figure, reference numeral 104a designates ATM access nodes 12a and 12b as service classes CBR.
(Continuous Bit Rate) VC for CBR, 104b is a C that connects ATM access nodes 12b and 12c with service class CBR.
VC for BR.

In FIG. 10, reference numeral 104c denotes an ATM.
Access nodes 12a and 12b to service class UBR
The UBR VC connected by (Unspecified Bit Rate), 104d is a UBR VC connecting the ATM access nodes 12b and 12c by the service class UBR, and the others are the same as those in FIG. 1 of the first embodiment. . Thus, in this embodiment, the QoS
VC1 for each (Quality of Service)
04a to 104d are set.

FIG. 11 shows each terminal 1 according to the ninth embodiment.
It is a figure which shows the service class allocated to 0a-10f. For example, data from the terminal 10a indicates transmission in the service class CBR, and data from the terminal 10b indicates transmission in the service class UBR. In this embodiment, data is transmitted using the correspondence table shown in FIG. 2 of the first embodiment and the format of the AAL5 CPCS-PDU shown in FIG.

Next, the operation will be described. In FIG. 10, when the terminal 10a transmits data to the terminal 10e, the terminal 10a transmits data to the ATM access node 12a using the line 11a. AT that received the data
The M access node 12a determines the partner node ID and the partner terminal ID from the slot position of the transmitting terminal, and determines from the correspondence table shown in FIG.
Is known to be the terminal 10e connected to.

Then, the ATM access node 12a
When encapsulating transmission data from the terminal 10a with AAL-5, the layer 3 address field 36 of FIG.
The “node ID + terminal ID” of the terminal 10e is written. Then, as shown in FIG. 11, since the data sent from the terminal 10a is to be transmitted in the service class CBR, the data is multiplexed on the VC 104a and transmitted to the ATM access node 12b.

At the ATM access node 12b, the layer 3 address field 36 of the received CPCS-PDU is
Is read, and from the correspondence table shown in FIG.
It is determined that the terminal 10e is connected to the M access node 12c. Also, the data is transmitted from the terminal 10a. According to FIG. 11, the data is transmitted in the service class CBR, and the ATM access node 12b multiplexes the data into the VC 104b and
2c.

In the ATM access node 12c, the layer 3 address field 36 of the received CPCS-PDU is
Is read, and the destination terminal is the ATM access node 12c.
It is determined that the terminal 10e is connected to the terminal 10e, and data is transmitted to the terminal 10e using the line 11e.

Similarly, in FIG. 10, when terminal 10b transmits data to terminal 10c, terminal 10b
1b to transmit data to the ATM access node 12a. ATM access node 12a receiving the data
Determines the partner node ID and the partner terminal ID of the terminal 10c from the slot position of the transmitting terminal, and knows from the correspondence table shown in FIG. 2 that the destination terminal is the terminal 10c connected to the ATM access node 12b. .

The ATM access node 12a
When the data from the terminal 10b is encapsulated by the AAL-5, the terminal 1 is added to the layer 3 address field 36 of FIG.
Write “node ID + terminal ID” of 0c. According to FIG. 11, the data transmitted from the terminal 10b is to be transmitted in the service class UBR.
The data is multiplexed on the VC 104c and transmitted to the ATM access node 12b.

In the ATM access node 12b, the layer 3 address field 36 of the received CPCS-PDU is
Is read, and the destination terminal is the ATM access node 12b.
It is determined that the terminal 10c is connected to the terminal 10c, and data is transmitted to the terminal 10c using the line 11c.

As described above, according to the ninth embodiment, the VCs 104a to 104d are set for each QoS,
By multiplexing the data into the VCs 104a to 104d corresponding to the S, the effect is obtained that the intra-channel multiplex exchange that guarantees the QoS can be performed.

Embodiment 10 FIG. The network configuration in the ATM communication system according to the tenth embodiment is the same as that shown in FIG. 10 of the ninth embodiment. Also in this embodiment, data is transmitted using the correspondence table shown in FIG. 2 of the first embodiment and the data format of the CPCS-PDU of AAL5 shown in FIG.

FIG. 12 shows an IP (Internet Pro).
TOS (Type) defined in the “tocol” header
FIG. 5 is a diagram illustrating a service class assigned to each value of an (Service) field. For example, TOS
If the field value is 0 × 10 data, transmission is performed using the VCs 104a and 104b of the service class CBR, and if the TOS field value is 0 × 08 data, transmission is performed using the VCs 104c and 104d of the service class UBR. It indicates that you want to.

Next, the operation will be described. In FIG. 10, when the terminal 10a transmits data to the terminal 10e, the terminal 10a transmits data to the ATM access node 12a using the line 11a. AT that received the data
The M access node 12a determines the partner node ID and the partner terminal ID from the slot position of the transmitting terminal, and determines from the correspondence table shown in FIG.
Is known to be the terminal 10e connected to.

The ATM access node 12a
When the data from the terminal 10a is encapsulated in the AAL-5 layer, the layer 3 address field 36 shown in FIG.
The “node ID + terminal ID” of the terminal 10e is written in the field.
Then, the TOS field value of the IP header is read,
When the TOS field value is 0 × 10, FIG.
Since data is transmitted in service class CBR, ATM
The access node 12a multiplexes the data on the VC 104a and transmits the multiplexed data to the ATM access node 12b.

At the ATM access node 12b, the layer 3 address field 36 of the received CPCS-PDU is
Is read, and from the correspondence table shown in FIG.
It is determined that the terminal 10e is connected to the M access node 12c. In addition, the TOS field value of the received CPCS-PDU is read, and according to FIG.
If the field value is 0 × 10, the data is transmitted in the service class CBR, so the ATM access node 12b
Multiplexes the data into the VC 104b and transmits the multiplexed data to the ATM access node 12c.

At the ATM access node 12c, the layer 3 address field 36 of the received CPCS-PDU is
Is read, and the destination terminal is the ATM access node 12c.
It is determined that the terminal 10e is connected to the terminal 10e, and data is transmitted to the terminal 10e using the line 11e.

Similarly, when terminal 10a transmits data to terminal 10e, the TOS field value is 0 × 0
8, the data is the service class UB according to FIG.
R, the ATM access node 12a multiplexes the data into the VC 104c and
2b.

In the ATM access node 12b, the layer 3 address field 36 of the received CPCS-PDU
Is read, and from the correspondence table shown in FIG.
It is determined that the terminal 10e is connected to the M access node 12c. Further, since the TOS field value of the received CPCS-PDU is read and the data is transmitted in the service class UBR according to FIG. 12, the ATM access node 12b multiplexes the data into the VC 104d and
The message is transmitted to the TM access node 12c.

In the ATM access node 12c, the layer 3 address field 36 of the received CPCS-PDU is
Is read, and the destination terminal is the ATM access node 12c.
It is determined that the terminal 10e is connected to the terminal 10e, and data is transmitted to the terminal 10e using the line 11e.

As described above, according to the tenth embodiment, the VCs 104a to 104d are set for each QoS,
S is dynamically determined by the TOS field, and QoS is determined.
By multiplexing the data into the VCs 104a to 104d according to the above, an effect is obtained that the intra-channel multiplex exchange that guarantees the QoS can be performed.

Embodiment 11 FIG. FIG. 13 is a block diagram showing a configuration of an ATM access node according to Embodiment 11 of the present invention. In the ATM access node 12a shown in the figure, reference numeral 135 denotes a CLAD (C
ell Assembly and Disassem
bly), 136 is an ATM switch having an ATM cell header conversion function and a traffic control function, and 137 is a VC multiplexing / demultiplexing unit for adding a layer 3 address and an SCI (short cell channel identifier) to perform VC multiplexing.
Others are the same as those shown in FIG. 1 of the first embodiment.

FIG. 14 shows terminals and VPI / VCI, VPI / VCI / SC in the ATM access node 12a.
FIG. 4 is a diagram showing CI mapping. For example, terminal 10a
Is transmitted as "1/1 / VPI / VCI"
The value of “1” is given by the CLAD 135, and further, in the VC multiplexing / demultiplexing unit 137, the data is VPI / VC
This indicates that "October 1" is given as I / SCI. From this, the VPI /
The VCI is “10/10”.

Next, the operation will be described. In FIG. 13, when the terminal 10a transmits data, the terminal 10a
Transmits to the ATM access node 12a using the line 11a. ATM access node 12a receiving the data
Then, the data is converted into cells by the CLAD 135.

At this time, the VPI in the ATM cell header is
For "/ VCI", "1/1" is used according to FIG. The cellized data is sent to the VC multiplexing / demultiplexing unit 137 while guaranteeing the QoS generally performed by the ATM switch 136. However, until the data is transmitted to the VC multiplexing / demultiplexing unit 137, the data is transmitted to the VC multiplexing / demultiplexing unit 137 by the VC switching function of the ordinary ATM switch 136 without considering the intra-channel multiplex switching of the patent. Can be

The VC multiplexing / demultiplexing unit 137 outputs the VPI / VCI / SCCI in the VC multiplexing / demultiplexing unit 1 shown in FIG.
Is 10/10/1, the V of the ATM cell header is
Set PI / VCI to “10/10” and further set S
Set CCI "1" to the layer 1 subchannel field. Then, by multiplexing and transmitting the data to the VC 14a, intra-channel multiplex exchange is performed.

As described above, according to the eleventh embodiment, in the ATM access node 12a, the existing AT
By providing a VC multiplexing / demultiplexing unit 137 between the M switch 136 and the public ATM network 13 to perform intra-channel multiplexing, the QoS guarantee function of the existing ATM switch 136 can be used, and it is easy and inexpensive. , QoS guarantee can be realized.

Embodiment 12 FIG. FIG. 15 is a block diagram showing a configuration of an ATM access node according to Embodiment 12 of the present invention. In the figure, 153 is a public FR (F
154a is a public FR network 15
3 (Data Link Channel)
l). Note that FR is a multiplex switching system that omits retransmission control at the time of transmission error in order to realize high-speed transmission and realizes data multiplexing at a data link layer level.

The ATM access node 12 shown in FIG.
In the figure, reference numeral 157 denotes a DLC multiplexing / demultiplexing unit which performs an ATM / FR interconnection function and multiplexes / demultiplexes the DLC 154a, and 158 denotes an A which performs ATM / FR address conversion.
It is a TM-FR address converter. Also, CLAD13
5, the ATM switch 136 is the same as that shown in FIG.
Is the same as The ATM access node 12a is connected to the public F
It is connected to the DLC 154a in the R network 153.
Further, the terminals 10a to 10b and the lines 11a to 11b
This is the same as FIG. 1 of the first embodiment.

FIG. 16 is a diagram showing a data format of FR and a newly defined layer 1 sub-channel field according to the twelfth embodiment. In the figure, reference numeral 160 denotes a 1-byte start flag, and 161 denotes a DLCI (Data
This is a 2-byte address field including a link channel identifier (Link Channel Identifier) and the like. 162 is an information field of a maximum of 4096 bytes, 163 is a frame check sequence field of 2 bytes, and 164 is 1
Byte end flag. 165 is a layer 1 sub-channel field using the first 4 bytes of the information field 162.

Next, the operation will be described. In FIG. 15, when the terminal 10a transmits data to a terminal 10e (not shown), the terminal 10a
The data is transmitted to the TM access node 12a. At the ATM access node 12a receiving the data, the CLAD
The data is cellized by 135. The cellized data is transmitted via the ATM switch 136 to the DLC multiplex /
It is sent to the separation unit 157.

The DLC multiplexing / demultiplexing unit 157
e Relay Forum FRF. According to 8, A
Performs TM and FR format conversion. Also, at this time,
The ATM-FR address converter 158 converts the VP to the DL
By determining C and determining SCCI from VC,
It performs ATM and FR address translation. The DLC multiplexing / demultiplexing unit 157 describes the value of the DLC in the address field 161 shown in FIG.
Is similarly described in the layer 1 subchannel field 165, and the data is stored in the DLC 154a of the public FR network 153.
Multiplexed and transmitted, thereby performing intra-channel multiplex exchange.

As described above, according to the twelfth embodiment, in the ATM access node 12a, the existing AT
A DLC multiplexer / demultiplexer 157 and an ATM-FR address converter 158 are provided between the M switch 136 and the public FR network 153.
And multiplexing in a channel by providing the above-mentioned structure, it is possible to easily and inexpensively perform DLC multiplexing in the public FR network 153 using the VC switching mechanism of the ATM switch.

[0125]

As described above, according to the present invention, the AT
The M access node comprises a correspondence table between the terminal's layer 3 address and the ATM access node to which the terminal is connected,
When data from the terminal is encapsulated in the AAL5 layer, a layer 3 address is written in the data format of the AAL5 CPCS-PDU, and the data is transmitted to a public ATM.
By multiplexing and transmitting to a network VC, a network can be constructed by the VC, and there is an effect that the network cost can be greatly reduced.

According to the present invention, the ATM access node determines the layer 3 address of the terminal and the AT to which the terminal is connected.
A correspondence table with M access nodes is provided, and when converting data from a terminal into an ATM cell, a layer 3 address is written in the data format of the ATM cell, and the data is stored in a public AT.
By multiplexing and transmitting to the VC of the M network, a network can be constructed by the VC, and there is an effect that the network cost can be greatly reduced.

According to the present invention, the ATM access node determines the layer 3 address of the terminal and the AT to which the terminal is connected.
A correspondence table with M access nodes is provided. When data from a terminal is converted into a short cell in the AAL2 layer, the AAL
By writing the layer 3 address in the data format 2 and multiplexing and transmitting the data to the VC of the public ATM network, the network can be constructed by the VC, and the network cost can be greatly reduced. There is.

According to the present invention, the ATM access node holds the SCI of the layer 1 subchannel designating the terminal to which data is to be transmitted, and transmits the data from the terminal to AAL5
When encapsulating in the layer of AAL5, the CPCS-
By writing the SCCI in the data format of the PDU and multiplexing and transmitting the data to the VC of the public ATM network, it is possible to construct a network by the VC and to greatly reduce the network cost. .

According to the present invention, when the ATM access node determines, by signaling, the SCI of the layer 1 subchannel designating the terminal to which data is to be sent, and encapsulates the data from the terminal in the AAL5 layer, A
By writing SCCI in the format of the CPCS-PDU of AL5 and multiplexing and transmitting the data to the VC of the public ATM network, it is possible to construct a network on the VC and to greatly reduce the network cost. effective.

According to the present invention, the ATM access node determines, by signaling, the SCI of the layer 1 sub-channel designating the terminal to which data is to be sent, and converts the data from the terminal into an ATM cell. Write SCCI to data format and public AT
By multiplexing and transmitting to the VC of the M network, a network can be constructed by the VC, and there is an effect that the network cost can be greatly reduced.

According to the present invention, the VC for signaling
In a public ATM network using a VC for user data and user data, the ATM access node also determines by signaling the SCI of the layer 1 sub-channel designating the terminal to which the data is to be sent, and transmits the data from the terminal to the AAL2 layer. When a short cell is used, the SCCI is written in the data format of AAL2, and the data is multiplexed and transmitted to the VC for user data in the public ATM network.
There is an effect that a network can be constructed by VC and network cost can be significantly reduced.

According to the present invention, the VC for signaling
Also, in a public ATM network using a VC for user data, when the ATM access node encapsulates the signaling data in the AAL5 layer, the AAL5 data format designates a data destination terminal in the AAL5 data format. By writing the SCCI of the sub-channel and multiplexing the signaling data to the signaling VC of the public ATM network and transmitting the data, a network connection can be established by setting the data connection, and the network cost can be reduced. Has the effect of being able to reduce significantly.

According to the present invention, even in a public ATM network having a plurality of VCs corresponding to service classes, the AT
The M access node comprises a correspondence table between the terminal's layer 3 address and the ATM access node to which the terminal is connected,
When data from the terminal is encapsulated in the AAL5 layer, a layer 3 address is written in the data format of the AAL5 CPCS-PDU, and the data is transferred to a public ATM network VC according to the service class assigned to each terminal. By multiplexing and transmitting, a network can be constructed using VC, and the network cost can be greatly reduced.

According to the present invention, even in a public ATM network having a plurality of VCs corresponding to service classes, the AT
The M access node comprises a correspondence table between the terminal's layer 3 address and the ATM access node to which the terminal is connected,
When data from the terminal is encapsulated in the AAL5 layer, the layer 3 address is written in the data format of the AAL5 CPCS-PDU, and the data is stored in the public ATM network according to the service class assigned to the TOS of the data. By multiplexing and transmitting to a VC, it is possible to construct a network with the VC, and it is possible to greatly reduce the network cost.

According to the present invention, an ATM access node includes a CLAD for assembling / disassembling data cells,
A with M cell header conversion function and traffic control function
The TM switch and the SC of the layer 1 subchannel that specifies the layer 3 address of the terminal or the terminal to which the data is sent
The provision of the VC demultiplexing unit for performing the VC multiplexing by adding the CI makes it possible to use the QoS guarantee function of the existing ATM switch and realize the QoS guarantee easily and inexpensively. effective.

According to the present invention, even in a public FR network, an ATM access node has a CLAD for assembling / disassembling data cells, an ATM switch having an ATM cell header conversion function and a traffic control function, and an ATM V switch.
Determine the DLCI of FR from P and FR from ATM VC
The ATM-FR address conversion unit that performs the address conversion between the ATM and the FR by determining the SCCI of the ATM, the DLCI and the SCCI determined by the ATM-FR address conversion unit are written in the data format of the FR, and the data is written to the public FR. The provision of the DLC multiplexing / demultiplexing unit that multiplexes and transmits the DLC to the DLC has an effect that the DLC multiplexing in the public FR network can be easily and inexpensively performed using the VC switching mechanism of the ATM switch. .

[Brief description of the drawings]

FIG. 1 is a diagram showing a network configuration of an ATM communication system according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a correspondence table between a layer 3 address of a terminal and an ATM access node according to the first embodiment of the present invention.

FIG. 3 shows C of AAL5 according to Embodiment 1 of the present invention.
It is a figure which shows the data format of PCS-PDU, and a layer 3 address field.

FIG. 4 is a diagram showing a data format of an ATM cell and a layer 3 address field according to a second embodiment of the present invention.

FIG. 5 is a diagram showing an AAL2 data format and a layer 3 address field according to a third embodiment of the present invention.

FIG. 6 shows C of AAL5 according to Embodiment 4 of the present invention.
It is a figure which shows the data format of PCS-PDU, and a layer 1 subchannel field.

FIG. 7 is a diagram showing a data format of an ATM cell and a layer 1 subchannel field according to a sixth embodiment of the present invention.

FIG. 8 is a diagram showing a network configuration of an ATM communication system according to a seventh embodiment of the present invention.

FIG. 9 is a diagram showing an AAL2 data format and a layer 1 subchannel field according to a seventh embodiment of the present invention.

FIG. 10 is a diagram showing a network configuration of an ATM communication system according to Embodiment 9 of the present invention.

FIG. 11 is a diagram showing a service class assigned to each terminal according to Embodiment 9 of the present invention.

FIG. 12 shows each TOS according to the tenth embodiment of the present invention.
FIG. 6 is a diagram showing service classes assigned to the.

FIG. 13 is a block diagram showing a configuration of an ATM access node according to Embodiment 11 of the present invention.

FIG. 14 shows a terminal and V according to Embodiment 11 of the present invention.
FIG. 4 is a diagram showing mapping of PI / VCI and VPI / VCI / SCI.

FIG. 15 is a block diagram showing a configuration of an ATM access node according to Embodiment 12 of the present invention.

FIG. 16 is a diagram illustrating a frame relay data format and a layer 1 sub-channel field according to a twelfth embodiment of the present invention.

FIG. 17 is a diagram showing a network configuration of a conventional ATM communication system.

[Explanation of symbols]

10a-10f terminal, 12a-12c ATM access node, 13 public ATM network, 14a, 14b V
C, 30 user data section, 41 ATM cell information field, 54 data section, 84a, 84b VC for signaling, 84c, 84d VC for user data, 1
35 CLAD, 136 ATM switch, 137 V
C multiplexing / demultiplexing unit, 153 public FR network, 154 DL
C, 157 DLC multiplexing / demultiplexing unit, 158 ATM-FR
Address converter, 161 address field, 162
Information field.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K030 GA11 GA19 HA10 HB18 HB29 HC06 JA01 JA06 JA12 LB05 LE06 MA01 MB01 9A001 CC02 CC06 KK56

Claims (20)

[Claims] An ATM communication system in which an ATM (Asynchronous Transfer Mode) access node connected to a public ATM network transmits data from a terminal, wherein the ATM access node connects the terminal with a layer 3 address of the terminal. A correspondence table with the above-mentioned ATM access node is provided, and data from the above-mentioned terminal is transmitted to the AAL.
(ATM Adaptation Layer Type
e) When encapsulating at the layer of 5, the CPCS-PDU (Common Part Conv.
ergence Sublayer-Protocol
(Data Unit) data format, and writes the layer 3 address to the public ATM.
An intra-channel multiplex switching system characterized in that transmission is performed by multiplexing on a VC (virtual channel) of a network. 2. An ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal, wherein the ATM access node is connected to the layer 3 address of the terminal and the ATM connected to the terminal. A correspondence table with an access node is provided. When converting data from the terminal into an ATM cell, the layer 3 address is written in a data format of the ATM cell, and the data is multiplexed and transmitted to a VC of the public ATM network. Intra-channel multiplex switching. 3. The intra-channel multiplex switching system according to claim 2, wherein a layer 3 address is written in an ATM cell information field in an ATM cell data format. 4. An ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal, wherein the ATM access node is connected to a layer 3 address of the terminal and the ATM connected to the terminal. A correspondence table with access nodes is provided, and data from the above terminal is stored in AAL2.
When the short cell is formed in the layer of the above, the layer 3 address is written in the data format of the AAL2,
An intra-channel multiplex switching system, wherein the data is multiplexed and transmitted to a VC of the public ATM network. 5. The intra-channel multiplex switching system according to claim 4, wherein a layer 3 address is written in a data portion in the AAL2 data format. 6. An ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal, wherein the ATM access node specifies an SCCI (Layer 1 subchannel) for designating a terminal to which data is to be transmitted. Short data channel identifier), and when encapsulating data from the terminal in the AAL5 layer, the AAL5
The above SCC is added to the data format of the CPCS-PDU
Intra-channel multiplex switching system, wherein I is written, and the data is multiplexed and transmitted to a VC of the public ATM network. 7. An ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal, wherein the ATM access node transmits an SCCI of a layer 1 subchannel designating a terminal to which data is to be transmitted. Determined by signaling, when encapsulating data from the terminal in the AAL5 layer, the CPCS-
An intra-channel multiplex switching system, wherein the SCI is written in a PDU format, and the data is multiplexed and transmitted to a VC of the public ATM network. 8. An ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal, wherein the ATM access node transmits an SCCI of a layer 1 subchannel designating a terminal to which data is to be transmitted. Determined by signaling, when converting the data from the terminal into an ATM cell, writing the SCCI in the data format of the ATM cell, multiplexing the data with the VC of the public ATM network, and transmitting the multiplexed data. Intra-channel multiplexing. 9. The intra-channel multiplex switching system according to claim 8, wherein SCI is written in an ATM cell information field in the data format of the ATM cell. 10. An ATM communication system in which an ATM access node connected to a public ATM network using a signaling VC and a user data VC transmits data from a terminal, the ATM access node transmits data. The SCCI of the layer 1 sub-channel designating the previous terminal is determined by signaling, and when the data from the terminal is short-celled in the AAL2 layer, the SCI is written in the AAL2 data format, and the data is written in the AAL2 data format. An intra-channel multiplex switching system characterized by multiplexing and transmitting to a VC for user data in a public ATM network. 11. The intra-channel multiplex switching system according to claim 10, wherein the SCI is written in a data portion in the AAL2 data format. 12. An ATM communication system in which an ATM access node connected to a public ATM network using a signaling VC and a user data VC transmits data from a terminal, said ATM access node transmits signaling data. A
At the time of encapsulation in the AL5 layer, the SC1 of the layer 1 sub-channel designating the terminal of the data destination is written in the data format of the AAL5, and the signaling data is multiplexed on the signaling VC of the public ATM network. An intra-channel multiplex switching system characterized in that a connection for data is set by transmitting data. 13. The intra-channel multiplex switching system according to claim 6, wherein the SCI is written in a user data portion in a data format of the CPCS-PDU of AAL5. 14. A plurality of VCs corresponding to a service class
In an ATM communication system in which an ATM access node connected to a public ATM network having a function of transmitting data from a terminal, the ATM access node comprises a layer 3 address of the terminal and the ATM access node to which the terminal is connected. And the data from the above terminal is AAL5
When encapsulating with the layer of AAL5, CPC of AAL5
The layer 3 address is written in the data format of the S-PDU, and the data is stored in the VC of the public ATM network according to the service class assigned to each terminal.
Intra-channel multiplex switching system characterized in that the signal is multiplexed and transmitted. 15. A plurality of VCs corresponding to a service class
In an ATM communication system in which an ATM access node connected to a public ATM network having a function of transmitting data from a terminal, the ATM access node comprises a layer 3 address of the terminal and the ATM access node to which the terminal is connected. And the data from the above terminal is AAL5
When encapsulating with the layer of AAL5, CPC of AAL5
The layer 3 address is written in the data format of the S-PDU, and the TOS (Type Of
An intra-channel multiplexing switching method characterized in that the data is multiplexed and transmitted to a VC of the public ATM network in accordance with a service class assigned to the service. 16. An AAL5 layer CPCS-PDU
2. A layer 3 address is written in a user data section in the data format of (1).
4. The intra-channel multiplexing switching system according to any one of the items 4 and 15. 17. The method according to claim 1, wherein the layer 3 address is constituted by a node ID designating each ATM access node and a terminal ID designating each terminal.
2. The intra-channel multiplex switching system according to any one of 2, 4, 14, and 15. 18. An ATM communication system in which an ATM access node connected to a public ATM network transmits data from a terminal, wherein the ATM access node performs CLAD (Cel) for assembling / disassembling a cell of the data.
l Assembly and Disassembl
y), an ATM switch having an ATM cell header conversion function and a traffic control function, and a VC which performs VC multiplexing by adding a layer 3 address of the terminal or an SCCI of a layer 1 subchannel designating a terminal to which data is to be transmitted. An intra-channel multiplex switching system comprising a demultiplexing unit. 19. Public FR (Frame Relay)
An ATM access node connected to the network transmits data from the terminal to a DLC (DataLink C) of the public FR network.
an ATM communication system for transmitting data by using the ATM access node; a CLAD for assembling / disassembling the data cell; an ATM switch having an ATM cell header conversion function and a traffic control function; (Virtual path) from above DLCI of FR
(Data Link Channel Identify
er), and from the VC of the ATM, the SC of the FR
By determining the CI, the ATM-FR address converter that performs the address conversion of the ATM and the FR, and the DLCI and the SCCI determined by the ATM-FR address converter are written in the data format of the FR, A DLC multiplexing / demultiplexing unit for multiplexing the data on the DLC of the public FR and transmitting the multiplexed data. 20. The intra-channel multiplex switching system according to claim 19, wherein DLCI is written in an address field in the data format of FR, and SCI is written in an information field.