JP2010011024A - Transmission device and control method - Google Patents

Abstract

A function equivalent to automatic switching control in units of CHs for a plurality of interface packages in a leased line service in a public leased line service network cannot be realized by time division multiplex transmission.
SOLUTION: A plurality of interface packages are provided, and an association unit is provided for associating switching information with divided data obtained by dividing input data input from the interface package, and any of the input data from the plurality of interface packages is selected for output. Switching means for determining whether or not to do this based on switching information associated with the divided data of the input data is provided. This switching means is provided separately from the interface package.
[Selection] Figure 1

Description

  The present invention relates to a transmission apparatus and a control method provided with a plurality of interface packages and having redundancy.

  A dedicated line service accommodation method in a general time division multiplexing transmission apparatus (Time Division Multiplexing, hereinafter referred to as TDM) will be described with reference to FIG.

As shown in FIG. 20, the “dedicated line LI point interface board” (interface package) terminates the interface of the LI point (transmission path interface point) of the dedicated line service with the service speed of 64 kbps / 128 kbps. Then, the divided data obtained by dividing the input data of 64 kbps data × 2 channels (Channel, hereinafter referred to as CH) input from NT (Network Termination) is output to the “Time Switch (hereinafter referred to as TSW) unit”. On the contrary, 64 kbps data × 2CH divided data is input from the “TSW unit” and transmitted to the NT.
TE (Terminal Equipment) is a terminal device that is connected to the NT and transmits and receives data.

  Also, as shown in FIG. 20, the “transmission path interface board” time-division-multiplexes 64 kbps data of a plurality of channels input from the “TSW unit” to a high-speed transmission path interface such as 1.544 Mbps, and To the transmission line. Conversely, 64 kbps data of a plurality of channels separated from the high-speed transmission path interface is output to the “TSW unit”.

  In addition, as shown in FIG. 20, the “TSW section” switches the data in 64 kbps CH units and connects the “dedicated line LI point interface board” and the “transmission path interface board” to transmit and receive data. To. The time switch of the “TSW unit” can be any switch depending on the setting.

In addition, the time division multiplexing apparatus of the related technology of the present invention includes a TSW that includes only a 64 k unit TSW memory for performing switching in 64 kbps units and functions as a 64 k unit TSW, and has a control unit. There is one in which allocation setting is performed in units of 64 kbps in TSW (see, for example, Patent Document 1).
JP 2001-251265 A

However, the general TDM as shown in FIG. 20 has the following problems.
First, automatic switching control in units of CHs for a plurality of interface packages, which is performed in a leased line service in a public leased line service network, has not been realized.

  Further, when automatic switching control in units of channels for the LI point interface is to be configured by TDM, redundancy can be secured if the configuration is performed within the “dedicated line LI point interface board” as shown in FIG. It will disappear.

  Further, in the above-described Patent Document 1, allocation is set in units of 64 kbps in the TSW by a control signal so as to simplify the TSW and reduce the size of the device. In the unit of CH for a plurality of interface packages. It was not taken into consideration until automatic switching.

  The present invention has been made in view of such a situation, and a function equivalent to automatic switching control in units of CHs for a plurality of interface packages in a leased line service in a public leased line service network is provided in time division multiplex transmission. An object is to provide a transmission apparatus and a control method that can be realized.

  In order to achieve the above object, a transmission apparatus according to the present invention is a transmission apparatus having a plurality of interface packages, and associates associating switching information with divided data obtained by dividing input data inputted from the interface package. Switching means for determining which of input data from the plurality of interface packages is selected for output based on switching information associated with the divided data of the input data, the interface package It is provided separately.

  The control method according to the present invention is a control method for a transmission apparatus including a plurality of interface packages, and performs an associating step of associating switching information with divided data obtained by dividing input data input from the interface package. A switching step is provided separately from the interface package for determining which of the input data from the plurality of interface packages is selected for output based on switching information associated with the divided data of the input data. It is characterized by being performed by the switching means.

  As described above, according to the present invention, a function equivalent to automatic switching control in units of CHs for a plurality of interface packages in a leased line service in a public leased line service network can be realized in time division multiplex transmission. .

  Next, an embodiment in which a transmission apparatus and a control method according to the present invention are applied to a time division multiplex transmission apparatus (TDM) will be described in detail with reference to the drawings.

  The present embodiment is characterized in that the function equivalent to the automatic switching control of the terminal section by the ai (Active Indication) bit (T point interface activation display bit) in the dedicated line service of the service speed of 64 kbps / 128 kbps is realized by TDM. It is said.

First, an outline of the present embodiment will be described.
In the present embodiment, as shown in FIG. 1, the association unit associates the switching information (ai bit) with the divided data obtained by dividing the input data input from the interface package. Then, switching means provided separately from the interface package determines which input data from the plurality of interface packages is to be selected for output based on switching information associated with the divided data of the input data. .

  For this reason, it is possible to automatically switch the divided data for each channel by the switching means while ensuring the redundancy of the interface package. Therefore, a function equivalent to the automatic switching control in units of CHs for a plurality of interface packages in the dedicated line service can be realized in time division multiplex transmission.

FIG. 2 shows a schematic configuration of a “time division multiplex transmission apparatus (TDM)” as the present embodiment.
As shown in FIG. 2, the “dedicated line LI point interface board” (interface package) terminates the LI point interface of the dedicated line service at the service speed of 64 kbps / 128 kbps, and receives 64 kbps input data × 2 received from NT. For the channel, the ai bit included in the input data is used as a switching bit (switching information), and the switching bit is associated with the divided data obtained by dividing the input data and integrated (attached), and output to the “TSW unit”. Input to system 0 or system 1 of the “64k unit switching panel” (switching means). Conversely, 64 kbps data × 2 channels (hereinafter referred to as CH) output from the 0 system or 1 system of the “64 k unit switching board” from the “TSW unit” is input from the “TSW unit” and transmitted to the NT.

  Further, as shown in FIG. 2, the “64k unit switching board” inputs a plurality of CHs of 64 kbps data output from the “TSW unit” and switching bits linked to the 64 kbps data, and 0 in CH units based on the state of the switching bits. The system is switched to system 1 and output from the COM (COMmon) side to the “TSW unit”. Conversely, the 64 kbps data input from the “TSW unit” on the COM side is branched into the 0-system and the 1-system and output to the “TSW unit”.

  Further, as shown in FIG. 2, the “transmission path interface board” inputs the 64 kbps data plural CHs after the 0 system / 1 system switching outputted from the COM side of the “64 k unit switching board” from the “TSW section”. It is multiplexed on a high-speed transmission line interface such as .544 Mbps and transmitted between TDMs. Conversely, 64 kbps data of a plurality of channels separated from the high-speed transmission line interface is output to the “TSW unit” and input to the COM side of the “64 k unit switching panel”.

  In addition, as shown in FIG. 2, the “TSW unit” switches the divided data and the switching bit attached to the divided data in units of 64 kbps, and switches the “dedicated line LI point interface board” and “64 k unit switching”. It is possible to send and receive data by connecting to the 0 system or 1 system of the “board”. It is also possible to send and receive data by connecting to the COM side of the “transmission path interface board” and “64k unit switching board”. The time switch of the “TSW unit” can be any switch depending on the setting.

  In this way, in the present embodiment, the ai bit from the NT at the LI point is combined with the divided data as a switching bit and output to the “TSW unit”, and switching is performed by the “64k unit switching board”. Therefore, automatic switching control of the terminal section equivalent to the leased line service can be realized by TDM.

  Next, the configuration of the “time division multiplex transmission apparatus (TDM)” as this embodiment will be described in detail with reference to FIG.

As shown in FIG. 3, the “dedicated line LI point interface board” terminates the LI point of the dedicated line service, separates 64 kbps input data 2CH of the B1 and B2 channels, and is on a time-division bus of 8 kHz period. Output. Further, the ai bit received at the LI point is used as a switching bit, and is output to the time-division divided data. Conversely, 64 kbps data 2CH of the B1 and B2 channels input from the time-division bus of 8 kHz period is transmitted to the LI point.
An example of a time-division bus with an 8 kHz period is shown in FIG. Which time slot (Time Slot, hereinafter TS) is used on the bus can be arbitrarily assigned by setting.

Further, as shown in FIG. 3, the “64k unit switching board” is connected to the “TSW section” in the TDM, and each of the 0-system input data and the 1-system input data is used for output. Select for each CH and output to COM side. The selection is determined based on the switching bit associated with the divided data. As an example of the judgment condition, when the initial state is set to 0 system selection and thereafter the switching bit is set in the selected system, switching to the other is performed, and when both systems have the switching bit set, or both systems have no switching bit set. In some cases, there are conditions such as maintaining the current selection system.
On the other hand, the data input from the COM side is branched and output to the 0 system and the 1 system.

  Input / output data on the 0, 1 and COM side is allocated on a time-division bus with a period of 8 kHz as in the “dedicated line LI point interface board”. Which TS is used on the bus can be arbitrarily assigned by setting.

  As shown in FIG. 3, the “transmission path interface board” terminates a high-speed transmission path such as 1.544 Mbps, and separates a plurality of channels multiplexed on the transmission path to create a “dedicated line LI point interface board” or “64 k Output on the time-divided bus with an 8 kHz period as in the “switch board”. On the contrary, the data of a plurality of channels input from the bus time-divisionally divided into 8 kHz periods are multiplexed and transmitted on the transmission path. Which TS is used on the bus can be arbitrarily assigned by setting.

  As shown in FIG. 3, the “TSW unit” transmits the divided data allocated to the upstream side (direction from the LI point to the high-speed transmission line) time-divisionally divided into 8 kHz periods on the downstream side (from the high-speed transmission line to the LI). Switch to the bus in the TS direction. Any combination of switches is possible depending on the setting. FIG. 5 shows an example of the switch.

  Although the configuration of the present embodiment has been described in detail above, the “TSW unit” and “transmission path interface board” in FIG. 3 are well known to those skilled in the art and are not directly related to the present invention. A detailed configuration is omitted.

Next, the operation of the “time division multiplex transmission apparatus (TDM)” as this embodiment will be described.
First, the operation in the direction of transmission from the LI point shown in FIG. 3 to the high-speed transmission path will be described with reference to the time charts shown in FIGS. 6, 7, 8, 9, 10, and 11. FIG.

As shown in FIGS. 6 and 7, the “dedicated line LI point interface board” separates 64 kbps divided data 2CH of B1 and B2 channels stored in words # 1 to # 20 on the LI point interface received from NT. Further, the ai bit stored in the CL channel (line system control channel) is separated and tied to each of the 2CH divided data, and output to the assigned TS on the 8 kHz period time division bus.
In the examples of FIGS. 6 and 7, the 0 system side is assigned to TS1 and TS2, and the 1 system side is assigned to TS3 and TS4, respectively.

  As shown in FIG. 8, the “TSW unit” switches the divided data and the switching bit from the upstream bus to the downstream bus according to the set switch setting. In the example of FIG. 8, TS1, TS2, TS3, and TS4 are switched to TS5, TS6, TS7, and TS8.

  As shown in FIG. 9, the B1 and B2 channels on the 0-system side and the B1 and B2 channels on the 1-system side output from the “TSW unit” are input to the “64k unit switching panel” and are linked to the divided data. Either the 0 system or the 1 system is selected for each CH by the determination of the switching bit. The selected B1 and B2 channels are output to the assigned TS on the 8 kHz period time division bus. In the example of FIG. 9, the case where it is assigned to TS9 and TS10 is shown.

  As shown in FIG. 10, the “TSW unit” switches data from the upstream bus to the downstream bus according to the set switch setting. In the example of FIG. 10, the case where TS9 and TS10 are switched to TS11 and TS12 is shown.

  As shown in FIG. 11, the selected B1 and B2 channels output from the “TSW unit” are input to the “transmission path interface board” and multiplexed on the CH on the high-speed transmission path. In the example of FIG. 11, a case where multiplexed on CH1 and CH2 is shown.

  Next, the operation in the direction of transmission from the high-speed transmission path in FIG. 3 to the LI point will be described with reference to the time charts shown in FIGS. 12, 13, 14, 15, 16, and 17.

  As shown in FIG. 12, the “transmission line interface board” separates 64 kbps divided data 2CH of B1 and B2 channels multiplexed on a predetermined CH on a high-speed transmission line, and assigns it to the assigned TS on the 8 kHz period time division bus. Is output. In the example of FIG. 12, an example is shown in which multiplexing is performed on CH1 and CH2 through a high-speed transmission path, and assigned to TS11 and TS12 through an 8 kHz period time division bus.

  As shown in FIG. 13, the “TSW unit” switches data from the upstream bus to the downstream bus according to the set switch setting. In the example of FIG. 13, TS11 and TS12 are switched to TS9 and TS10.

  As shown in FIG. 14, the B1 and B2 channels output from the “TSW unit” are input to the COM side of the “64k unit switching board” and branched into both the 0 system and the 1 system. The branched 0-system and 1-system B1 and B2 channels are output to the assigned TS on the 8 kHz time-division bus. In the example of FIG. 14, the 0 system is assigned to TS5, TS6, and the 1 system is assigned to TS7 and TS8.

  As shown in FIG. 15, the “TSW unit” switches data from the upstream bus to the downstream bus according to the set switch setting. In the example of FIG. 15, TS5, TS6, TS7, and TS8 are switched to TS1, TS2, TS3, and TS4.

  As shown in FIGS. 16 and 17, the B1 and B2 channels of each system output from the “TSW unit” are input to the “dedicated line LI point interface board” (in the examples of FIGS. 16 and 17, the 0 system side is TS1 and TS2 indicate that the system 1 side is assigned to TS3 and TS4), and are stored in words # 1 to # 20 on the LI point interface and transmitted to NT.

As described above, according to the present embodiment, the following effects can be obtained.
The first effect is that the ai bit is attached to the divided data divided in units of TS and sent to the switching unit via the TSW unit, thereby automatically switching the terminal section by the ai bit equivalent to the dedicated line service, that is, CH. This means that automatic switching between the 0 system and the 1 system in units can be realized by TDM.

  The second effect is that the dedicated line LI point interface unit and the switching unit are separated, so that the physical redundancy of the dedicated line LI point interface unit can be ensured.

As described above, in the present embodiment, the ai bit from the NT at the LI point is combined with the divided data as a switching bit and output to the “TSW unit”, which is different from the “dedicated line LI point interface board”. Switching is performed by a “64k unit switching panel”, and both are arbitrarily connected by a “TSW unit”.
As a result, automatic switching of the terminal section by the ai bit in TDM was realized. At the same time, the redundancy of the dedicated line LI point interface unit can be secured.

[Other embodiment 1]
As another embodiment of the present invention, the basic configuration is as described above, but the invention is further devised for ensuring redundancy. The configuration is shown in FIG. The “TSW unit”, “64k unit switching board”, and “transmission path interface board” shown in FIG. 18 have physical redundancy similar to the “dedicated line LI point interface board”. That is, when one system fails, the communication can be ensured by switching to the other system.

  The operation of the configuration example shown in FIG. 18 is basically the same as that of the above-described embodiment described with reference to FIG. 3, but the “TSW unit”, “64k unit switching board”, and “transmission path interface board” are It has an active system and a standby system, and the input is branched and input to the active system and the standby system. The output stops the standby system and outputs only the active system. When a failure occurs in the active system, the output of the active system is stopped and the standby system is output.

As described above, according to another embodiment shown in FIG. 18, the same effect as the above-described embodiment can be obtained, and the physical redundancy is increased, so that the effect of improving the reliability of the apparatus is obtained. It is done.
The “64k unit switching board” and “transmission path interface board” in this configuration may be configured as an integrated “64k unit switching transmission path interface board”.

[Other embodiment 2]

  As still another embodiment of the present invention, the basic configuration is as described above, but the number of switching groups is further devised. The configuration is shown in FIG. In the configuration example shown in FIG. 19, by automatically expanding the number of switching channels of the “64k unit switching panel” to 2 × N (N is an integer), automatic switching of terminal sections using ai bits equivalent to the dedicated line service is performed. N (N is an integer) sets can be realized.

  The operation of FIG. 19 is basically the same as that of the above-described embodiment described with reference to FIG. 3, except that the 0 system / 1 system / COM side of the “64k unit switching panel” is set to N (N is an integer) group. By providing, it has N times the number of CH.

  In other words, 2 × N (N is an integer) “exclusive line LI point interface board” is provided, whereas the set on the 0 system / 1 system / COM side in the “64k unit switching board” is N (N is N (Integer) set. Then, for input data from N sets of two “dedicated line LI point interface boards”, which input data is selected for output is determined based on the switching bit described above.

As described above, according to another embodiment shown in FIG. 19, the same effect as the above-described embodiment can be obtained, and the number of CHs per “64k unit switching panel” is increased, so that the mounting efficiency is improved. The effect of improvement is obtained.
The “64k unit switching board” and “transmission path interface board” in this configuration may be configured as an integrated “64k unit switching transmission path interface board”.

Each of the above-described embodiments is a preferred embodiment of the present invention, and the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.
For example, in the above-described embodiment, the “64k unit switching board” and the “transmission path interface board” are described as being separated from each other. However, the “64k unit switching board interface board” may be integrated. Good.

As described above, the present invention can be particularly preferably applied to a case where a general public leased line service network is replaced by TDM in one-to-one data communication at a service speed of 64 kbps / 128 kbps. .
In addition, when a function equivalent to the automatic switching of the terminal section by the ai bit of the leased line service network is required, it can be more suitably applied.

It is a figure which shows the outline of embodiment of this invention. It is a block diagram which shows the structure outline of the "time division multiplex transmission apparatus (TDM)" as embodiment of this invention. It is a block diagram which shows the example of a structure of the "time division multiplex transmission apparatus (TDM)" as this embodiment in detail. It is a figure which shows the example of the time-divided bus | bath of a 8 kHz period. It is a figure which shows the example of the combination of the connection by a switch. It is a figure which shows the example which attaches ai bit to division | segmentation data 2CH, and allocates it to TS. It is a figure which shows the example which attaches ai bit to division | segmentation data 2CH, and allocates it to TS. It is a figure which shows the example of the combination of the connection by a "TSW part". It is a figure which shows the operation example by which the division | segmentation data of 0 system and 1 system are determined and selected, and are allocated to TS. It is a figure which shows the example of the combination of the connection by a "TSW part". It is a figure which shows the operation example by which the division | segmentation data after selection are multiplexed by CH on a high-speed transmission path. It is a figure which shows the example which isolate | separates the division | segmentation data 2CH and allocates to TS. It is a figure which shows the example of the combination of the connection by a "TSW part". It is a figure which shows the operation example to which divided data are branched to 0 system and 1 system, and are allocated to TS. It is a figure which shows the example of the combination of the connection by a "TSW part". It is a figure which shows the operation example which stores division data 2CH in the word part for NT transmission. It is a figure which shows the operation example which stores division data 2CH in the word part for NT transmission. It is a block diagram which shows the structural example of the "time division multiplexing transmission apparatus (TDM)" as other embodiment of this invention. It is a block diagram which shows the structural example of the "time division multiplexing transmission apparatus (TDM)" as other embodiment of this invention. It is a block diagram which shows the structural example of the transmission system by a general TDM. It is a block diagram which shows the structural example which switches within a "private line LI point interface board" as related technology.

Claims (12)

A transmission device having a plurality of interface packages,
An associating means for associating switching information with divided data obtained by dividing input data input from the interface package;
Switching means for determining which of input data from the plurality of interface packages is selected for output based on switching information associated with the divided data of the input data is provided separately from the interface package A transmission device characterized by the above.   2. The association means associating one piece of switching information included in the input data with each divided data obtained by dividing the input data of each channel when the input data consists of a plurality of channels. Transmission equipment. The switching means is provided with an active system and a standby system,
3. The transmission apparatus according to claim 1, wherein an input to the switching unit is branched and input to the active system and the standby system, and an output from the switching unit is output from the active system. The switching means is
Determining which of the input data from the two interface packages is to be selected for output based on the switching information associated with the divided data of the input data;
4. The determination according to claim 1, wherein when the number of interface packages is 2 × N (N is an integer), the determination is performed on input data from each two interface packages. 5. The transmission device described.   The transmission apparatus according to any one of claims 1 to 4, wherein the switching information is an ai bit included in the input data.   The transmission apparatus according to claim 1, wherein the divided data is data obtained by dividing the input data in units of time slots for time division multiplex transmission. A control method for a transmission apparatus having a plurality of interface packages,
Performing an associating step of associating switching information with divided data obtained by dividing input data input from the interface package;
A switching step for determining which of input data from the plurality of interface packages is selected for output based on switching information associated with the divided data of the input data is provided separately from the interface package A control method characterized by being performed by a switching means.   8. In the association step, when the input data includes a plurality of channels, one switching information included in the input data is associated with each divided data obtained by dividing the input data of each channel. Control method. The switching means is provided with an active system and a standby system,
9. The control method according to claim 7, wherein an input to the switching unit is branched and input to the active system and the standby system, and an output from the switching unit is output from the active system. In the switching step,
Determining which of the input data from the two interface packages is to be selected for output based on the switching information associated with the divided data of the input data;
10. The determination according to claim 7, wherein when the number of interface packages is 2 × N (N is an integer), the determination is performed on input data from each two interface packages. The control method described.   The control method according to claim 7, wherein the switching information is an ai bit included in the input data.   12. The control method according to claim 7, wherein the divided data is data obtained by dividing the input data in units of time slots for time division multiplex transmission.

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