CN1232073C - Method and equipment for implementing service interchanging between subnet of synchronous digital transmission system - Google Patents

Abstract

The invention discloses a method for realizing business intercommunication between subnets in a synchronous digital transmission system. The business telephone boards between the units are interconnected through serial lines and telephone lines. When the network elements between the two subnets realize business intercommunication, the signaling and voice of the business telephone are transmitted through the serial lines and telephone lines between the network elements of the outgoing subnets. The invention also discloses a device for realizing the above method at the same time. The method and the device can not only realize the official intercommunication of any network element between subnets, but also reduce resource consumption. The design is simple, easy to implement, stable, convenient and reliable.

Description

Method and device for realizing business interworking between subnets in synchronous digital transmission system

technical field

The invention relates to a communication technology between subnets in a Synchronous Digital Hierarchy (SDH) system, especially a method and a device for realizing official business intercommunication between subnets in a synchronous digital transmission system.

Background of the invention

In the SDH optical transmission network, each network element is connected through an optical fiber, and each network element realizes the user's request for an official call through the official bytes in the SDH frame structure - E1 and E2. In an actual networking environment, two subnets A and B that are relatively close to each other can communicate with each other in their respective services and business affairs. However, in the absence of optical fiber connection, the service call connection between any network element in subnet A and any network element in subnet B cannot be realized. The current solution is to select a network element in each of the A and B subnets, add an optical port board or an optical port to the selected network element, and connect the two subnets A and B through optical fibers to realize the business call connection. As shown in Figure 1.

Figure 1 is a schematic diagram of a network that realizes business interworking between two adjacent subnets in the prior art. There are four network elements 1, 2, 3, and 4 in subnet A and subnet B respectively, and each network element in subnet A The business and business intercommunication between the two subnets, and the business and business intercommunication between the network elements in subnet B, but the communication between the two subnets cannot be realized. At this time, select network element 4 in subnet A and subnet B respectively, add an optical port board to the optical interface processing modules of the two network elements 4, or select the original optical port board of network element 4 An unused optical port connects the two network elements through an optical fiber, and then connects subnets A and B together. With the optical fiber path, any network element in subnets A and B can communicate with each other through the optical fiber through the E1 and E2 bytes in the SDH frame structure.

Based on the above networking structure, the implementation process of business interworking is as follows, as shown in Figure 3: When NE 3 in subnet B wants to make a business call with NE 2 in subnet A, NE 2 in subnet A Network element 2 transmits the official bytes E1 and E2 to the optical interface board 301 of the optical interface processing module of network element 4 through the optical path 304 through the SDH frame structure, and the optical interface board 301 sends the E1 and E2 bytes to On the main control board (SCC) 302, the SCC302 sends the E1 and E2 bytes to the service phone board 500 through the downlink high-speed signal line, and transmits the SDH frame from the optical port on the service phone board 500 through the optical path 305 to send the E1 and E2 bytes to the service phone board 500. The bytes are sent from the optical port to the service telephone board 500 of network element 4 in subnet B, and then the SCC302 of network element 4 receives the E1 and E2 bytes sent by the service telephone board 500, and then sends them to the optical interface board 301, Then, the official information is transmitted to the network element 3 of the subnet B through the optical path 306 between the network 4 and the network element 3 .

Figure 2 is a schematic diagram of a network in which two back-to-back subnets realize business intercommunication in the prior art. Subnet A and subnet B are two chain networks. Subnet A includes two nodes net1 and net2, and net1 and net2 The business and official affairs between them are all interoperable. Similarly, subnet B includes two nodes net3 and net4, and the business and official affairs between net3 and net4 are also interoperable. But if there is no optical path connection, net1, net2 and net3, net4 cannot be connected for business. Add optical port boards on net2 and net3 respectively or select unused optical ports on the original optical port boards and connect them with optical fibers to realize business intercommunication between A and B subnets. The implementation process is the same as that of the first The implementation process in this networking situation is similar.

For the above two solutions to realize business intercommunication between networks, although the interconnection is realized by optical path, the transmission distance is relatively long, and it is stable and reliable. However, adding optical boards and optical fibers will undoubtedly increase the cost of equipment and increase the complexity of structural design; moreover, although the added optical fibers and optical boards can also be used for business communications, if the added optical paths do not transmit services, they are purely It is obviously a great waste of resources to transmit the business bytes E1 and E2. In addition, not all devices can directly add optical boards. For example, in the second solution, if net2 and net3 are terminal multiplexer (TM) devices, intercommunication cannot be achieved by adding optical boards. It can be seen that the existing solution The program also has certain restrictions on the equipment.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method and device for realizing business intercommunication between subnets in a synchronous digital transmission system, so that it can not only realize business intercommunication of any network element between subnets, but also reduce resource consumption, The design is simple, easy to implement, stable, convenient and reliable.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A method for realizing business intercommunication between subnets in a synchronous digital transmission system, the method is to add an outgoing subnet processing module to the service telephone board of each outgoing subnet network element, and the public service between two outgoing subnet network elements The outbound subnet processing modules of the telephone board are interconnected through serial lines and telephone lines; when the network elements between the two subnets realize business interworking, the non-outgoing subnetwork elements are connected through the optical path between the network elements and the outbound subnetwork network of the local network The main control board in the unit transmits the order bytes in the frame structure to the outbound subnet processing module on the service telephone board of the outbound subnet network element of the local network; or, the outbound subnet network element passes the outbound subnet on the service telephone board The optical path connection between the processing module, the main control board and the network elements transmits the business bytes to the network elements of the non-outgoing subnet of the network; The serial line and telephone line connected between the network processing modules are used for transmission.

When the non-outgoing subnet network elements of the two subnets realize business interworking, the method specifically includes:

The network element of the non-outgoing subnet sends the order byte to the optical interface board of the optical interface processing module of the outbound subnet network element through the optical path, and the optical interface board sends the order byte to the main control board through the uplink high-speed signal line, and the main control board Send the business byte to the business phone board through the downlink high-speed signal line, and then send it to the outgoing subnet network element of the destination subnet through the signaling interface and voice interface connected to the outgoing subnet processing module on the business phone board;

After receiving the information from the voice interface and signaling interface connected to the subnet processing module on the service phone board, the outbound subnet network element of the destination subnet integrates the signaling and voice into the overhead time slot, and transmits the information through the uplink high-speed signal line The business bytes are sent to the main control board, and the main control board sends the business bytes to the optical interface board through the downlink high-speed signal line, and then to the destination network element through the optical path.

In the above process, the signaling is analyzed and converted and the overhead integration is processed in the service telephone board, and the voice information is coded and decoded and the overhead integration is processed in the service telephone board.

The present invention also proposes a device for realizing the above method. The device is located in the service telephone board, and is connected with the service telephone board of the subnet network element in another subnet through the serial line of the signaling interface and the telephone line of the voice interface. , the device includes at least:

The signaling processing module is connected to the signaling interface and is used to analyze the signaling and send it to the main control module for processing;

The main control module is used to interpret signaling and voice and control the transmission of signaling and voice;

The overhead and voice processing module is connected to the voice interface and is used for codec and overhead integration processing of the voice;

The main control module is simultaneously connected to the signaling processing module and the overhead and voice processing module through a control bus, a data bus and an address bus.

Wherein, the signaling processing module further includes a general asynchronous protocol processing chip and a level conversion unit, and the level conversion unit is connected with the signaling interface. The overhead and voice processing module further includes an overhead processing unit, a codec, and a user circuit. The overhead processing unit is connected to the main control board (SCC) through an overhead bus, and the user circuit is directly connected to the voice interface.

As can be seen from the above scheme, the key of the present invention is to add a subnet processing module in the service telephone board of the subnet network element, and realize the connection between the subnets by electrical connection through special signaling and voice interfaces. Business exchange.

Therefore, the method and device for realizing intercommunication between subnets in the synchronous digital transmission system provided by the present invention, because the two subnets are connected by the service telephone board in the network element of the subnet by means of electrical connection, the realization of It is simple and easy to implement, stable and reliable; and the structural design is not complicated, and there is no restriction on the equipment. Because it only needs to add simple circuit boards, serial port lines and telephone lines, compared with adding optical port boards and optical fibers, resource consumption and equipment costs are greatly reduced. For any network element between two subnets, business intercommunication can be realized through optical path and circuit.

Description of drawings

Fig. 1 is a network diagram of an embodiment of realizing business interworking between two subnets in the prior art;

Fig. 2 is the networking diagram of another embodiment that realizes business interworking between two subnets in the prior art;

Fig. 3 is a schematic diagram of the process of realizing business interworking between two subnets in the networking example shown in Fig. 1;

4 is a schematic diagram of the composition and structure of the outbound subnet processing module in the present invention;

Fig. 5 is a schematic diagram of the connection relationship between the service phone board and other parts in the optical interface processing module.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Since the use of optical paths to realize the intercommunication between subnets wastes resources and increases costs, the present invention uses an electrical connection to connect the service telephone boards on the network elements of the selected outgoing subnets in the two subnets together, so that through An electrical connection connects the network elements of the two optical path connection subnets together, that is to say, there may be a section of circuit in the middle of the business intercommunication between two network elements.

Fig. 4 is the constituent structure schematic diagram of subnet processing module in the present invention, and the present invention is to increase a subnet processing module 400 on the original service telephone board of the selected subnet network element of each subnet, to realize Business exchange. As shown in Figure 4, the outbound subnet processing module 400 at least includes three parts: a main control module 401, an overhead and voice processing module 402, and a signaling processing module 403. Between the overhead and voice processing module 402 and the main control module 401, the signaling The transmission of control signaling and voice data is realized between the command processing module 403 and the main control module 401 through a control bus (CB), a data bus (DB) and an address bus (AB). The outgoing subnet processing module 400 is connected with the outgoing subnet processing module of the service telephone board in the outgoing subnet network element of another subnet through a signaling interface and a serial port line to realize signaling intercommunication. In this embodiment, the signaling interface adopts DB9 Serial port; Simultaneously, this outgoing subnetwork processing module is connected with the outgoing subnetwork processing module of the service telephone board in another subnetwork network element by voice interface and telephone line, realizes voice intercommunication, voice interface adopts RJ45 interface among the present embodiment. Wherein, the signaling processing module 403 includes a level conversion unit and a universal asynchronous protocol processing chip (UART) unit, and the signaling is interpreted through the conversion of the level conversion unit and the universal asynchronous protocol processing chip (UART) unit through the signaling interface After processing, the interpreted signaling is sent to the CPU for further processing, and the level conversion unit can use an RS232/RS422 serial port conversion chip; the overhead and voice processing module 402 includes an overhead processing unit, a codec, a user circuit and a local telephone Interface, the voice is sent to the overhead processing unit through the processing of the user circuit and the codec, and switched to the corresponding time slot.

The connection relationship between the business phone board 500 and other parts in the optical interface processing module is shown in Figure 5. One end of the business phone board (EOW) 500 is connected to the optical interface processing module through the uplink high-speed signal line (UHW) and the downlink high-speed signal line (DHW). The SCC is also connected to the optical interface board through UHW and DHW at the same time; the other end of the service phone board 500 is directly connected to the The service phone board of the outgoing subnet NE of another subnet is connected. Among them, only E1 and E2 bytes are transmitted on the HW between the SCC and the service phone board 500, while various overhead bytes are transmitted on the HW between the optical interface board and the SCC. In the prior art, when optical fiber connection is used to realize business intercommunication, the PCM codes of signaling and voice are time-divisionally transmitted through E1 and E2 bytes, that is, the signaling and voice go in the same time slot, while in this In the invention, signaling and voice are transmitted separately.

Combining with Figure 1, Figure 4 and Figure 5, still taking the topology structure in Figure 1 as an example, taking the network element 4 of subnet A and subnet B as the outgoing subnet network element, and the network elements of subnet A and subnet B respectively A subnet processing module 400 is added to the service phone board 500 of 4. In this embodiment, the general asynchronous protocol processing chip of the signaling processing module 403 in the outbound subnet processing module 400 adopts ST16C2552; the overhead processing unit in the overhead and voice processing module 402 adopts a programmable logic device, such as: FPGA, user circuit The unit consists of MT8870DSR, TP3067 and SH723 thick film chips. When NE 2 in subnet A wants to make an official call with NE 3 in subnet B, NE 2 in subnet A transmits the overhead bytes of the SDH frame structure via the optical path between NEs 1 and 4 Transmission to the optical interface board of network element 4, the optical interface board of network element 4 sends the overhead bytes to the main control board SCC through the UHW, and the SCC extracts the business bytes E1 and E2, and transmits them to the outbound subnet through the DHW Analysis and interpretation are performed in the main control module 401 of the processing module 400. The main control module 401 sends the signaling and voice to the signaling processing module 403 and the overhead and voice processing module 402 respectively via the bus, and undergoes corresponding codec or level conversion After processing, the signaling and voice are respectively sent to the signaling processing module 403 on the subnetwork processing module 400 of the subnetwork B network element 4 through the serial port line connected to the signaling interface and the telephone line connected to the voice interface, and overhead and voice processing In module 402, after signaling conversion and voice codec processing respectively, signaling and voice are sent to the main control module 401 through the bus, if the main control module 401 interprets that the voice and signaling are the phone of this station, then the voice coding is performed by The overhead processing module is crossed to the local time slot, and then sent to the local telephone interface through the codec and the user circuit, and the business is connected at this time. If the main control module 401 explains that the voice and signaling are not the phone of the local station, the main control module 401 controls the overhead processing unit in the overhead and voice processing module 402 to integrate the signaling and voice into the corresponding overhead time slot, and pass the overhead The E1 and E2 bytes of the bus are transmitted from the main control board SCC to the optical interface board, and then transmitted to the network element 3 through the optical path connection. In this way, any network element on subnets A and B can realize business communication.

Claims (6)

1, a kind ofly realizes in the synchronous digital transmission system method of public affair intercommunication between subnet, it is characterized in that: go out to increase by one in the Order Wire Card OW of subnet network element and go out the subnet processing module at each, two go out the going out between the subnet processing module by Serial Port Line and telephone wire interconnection of subnet network element Order Wire Card OW;

When two sub-inter-network units realize the public affair intercommunications, non-ly go out that the subnet network element connects by the light path between network element and Home Network goes out master control borad in the subnet network element and transmits public affair byte to Home Network in the frame structure and go out and go out the subnet processing module on the subnet network element Order Wire Card OW; Perhaps, going out the subnet network element connects and transmits public affair byte to Home Network non-and go out the subnet network element by the light path between subnet processing module, master control borad and network element of going out on self Order Wire Card OW; Go out the signaling of official telephone between the subnet network element and speech respectively by going out Serial Port Line and the telephone wire transmission that is connected between the subnet processing module on the Order Wire Card OW separately.

2, method according to claim 1 is characterized in that, the non-of two subnets goes out when realizing the public affair intercommunication between the subnet network element, and this method specifically comprises:

Non-ly go out the subnet network element and deliver to out the public affair byte on the Optical Fiber Interface Board of subnet network element optical interface processing module by light path, Optical Fiber Interface Board is delivered to master control borad by the up-high speed holding wire with the public affair byte, master control borad is delivered to Order Wire Card OW by the down high speed holding wire with the public affair byte, goes out the subnet network element via what go out on the Order Wire Card OW that signaling interface that the subnet processing module connected and cable voice port deliver to the purpose subnet again;

After the going out the subnet network element and go out cable voice port that the subnet processing module connects and signaling interface and receive information of purpose subnet from self Order Wire Card OW, signaling and speech are incorporated into the expense time slot, by the up-high speed holding wire public affair byte is delivered to master control borad, master control borad is delivered to Optical Fiber Interface Board by the down high speed holding wire with the public affair byte again, and then sends to the purpose network element by light path.

3, method according to claim 1 and 2 is characterized in that: signaling is resolved conversion and expense integration processing in Order Wire Card OW, speech information carries out encoding and decoding and expense integration processing in Order Wire Card OW.

4, a kind of device of realizing said method, it is characterized in that: this device is arranged in Order Wire Card OW, and the Order Wire Card OW that goes out the subnet network element in the Serial Port Line by signaling interface and the telephone wire of cable voice port and another subnet links to each other, and this device comprises at least:

Signaling processing module links to each other with signaling interface, is used to resolve signaling and gives the main control module processing;

Main control module is used to explain signaling and speech and controls signaling and the transmission of speech;

Expense and speech processing module link to each other with cable voice port, are used for speech is carried out encoding and decoding and expense integration processing;

Main control module is connected signaling processing module and expense and speech processing module simultaneously by control bus, data/address bus and address bus.

5, device according to claim 4 is characterized in that: described signaling processing module further comprises universal asynchronous protocol processes chip and level conversion unit, and this level conversion unit links to each other with signaling interface.

6, device according to claim 4, it is characterized in that: described expense and speech processing module further comprise overhead processing unit, codec and subscriber line circuit, wherein, described overhead processing unit links to each other with master control borad (SCC) by overhead bus, and subscriber line circuit directly connects cable voice port.

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