WO2008011835A1

WO2008011835A1 - A device and method of implementing backup for e1/t1 interface

Info

Publication number: WO2008011835A1
Application number: PCT/CN2007/070338
Authority: WO
Inventors: Weifeng Fang; Zhenya Li; Nengwu Xiang; Yaowen Zhang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-07-21
Filing date: 2007-07-20
Publication date: 2008-01-31
Also published as: CN100479341C; CN1996772A

Abstract

The invention provides a device and method of implementing backup for El/Tl interface. The device includes a main interface board and a standby interface board. Both of the main interface board and the standby interface board include a El/Tl interface module and at least one relay. Once one of the two interface boards is in failure, the other board is put into operation by the relay.

Description

Device and method for realizing El/Tl interface backup

[I] Technical field

[2] The present invention relates to the field of communications, and in particular, to an apparatus and method for backing up an E1/T1 interface.

[3] Background of the invention

[4] E1

(PCM30, nominal rate 2048kbit/s) /Tl (PCM24, nominal rate 1544kbit/s) The interface is an international standard and is a common interface type for network devices.

[5] One of the prior art E1/T1

The basic design idea of the outgoing mode of the interface is as follows: 数字 The frame and the analog part of the E1/T1 interface are integrated on the board. The board itself does not have an interface. The interface is placed on the backplane. On the other hand, use the SMB interface to release the backplane.

[6] In the process of implementing the present invention, the inventors found the above E1/T1

The outgoing mode of an interface has at least the following disadvantages:

[7] 1, unable to densely outlet;

[8] 2. There is no separation between the analog and digital parts;

[9] 3. Interface backup of E1/T1 is not supported.

[10] Another E1/T1 in the prior art

The basic design idea of the outgoing mode of the interface is: Integrate the digital and analog parts of the E1/T1 interface on the board. The single-board panel has an interface. There are many outlets. You can use the SMB interface to select the panel outlet mode.面板Use the panel outlet mode of interface modes such as DB100, DB50, DB25, etc., which is suitable for the design of front plug or front and rear plug-in frame.

[I I] In the process of implementing the present invention, the inventors have found that the above-mentioned E1/T1 interface has at least the following disadvantages:

[12] 1. There is no separation between the analog and digital parts;

[13] 2. The hardware does not support E1/T1 interface backup. The interface backup is implemented through software. The system architecture is very complicated, wastes transmission resources, and the switching speed is slow. [14] 3, each board must be out, increase the number of cables.

[15] According to the feedback from the market, E1/T1 interface damage is one of the highest proportions of board failures.

When the E1/T1 interface is damaged, it will not only cost a lot of maintenance costs, but may even bring a major accident to the office. If the board is damaged, the general processing method is to change the board, but the board change will inevitably affect the bundled E1/T1 cable, which is not desirable from the perspective of engineering and reliability.

[16] Due to the technical specificity of the E1/T1 interface, it has been difficult to implement E1/T1 interface backup. Because the network status of the board adopting the E1/T1 interface is important, in order to meet the requirements of low cost and reliability, the board that uses the E1/T1 interface needs to use the inter-board backup mode. If the E1/T1 interface of the interface card is damaged or the board is faulty, the system can automatically switch all the E1/T1 interfaces of the board to the adjacent standby interface board to enhance the E1. The reliability of the /T1 interface improves the stability of the system.

[17] One method for realizing E1/T1 interface backup in the prior art is as follows: 釆Use relay to realize backup of E1/T1 interface. When the main front board is damaged, the automatic front switch is automatically switched, and the standby front board automatically Putting into work, the reliability of the E1/T1 interface is enhanced.

[18] In the process of implementing the present invention, the inventors have found that the above method for realizing E1/T1 interface backup does not provide a cable connection mode of the main and standby front boards and the external E1/T1 interface lines. At the same time, the circuit part of the spare front board cannot provide a loopback channel during the process of not using it, and the standby circuit cannot be tested.

[19] Summary of the invention

[20] The embodiment of the present invention provides an apparatus and method for implementing E1/T1 interface backup, thereby

The drawbacks of the cable connection method in which the main and standby front boards and the external E1/T1 interface lines are not provided in the prior art are overcome.

[21] The purpose of the embodiment of the present invention is achieved by the following technical solutions:

[22] A device that implements the backup of the E1/T1 interface, including: the main interface board and the standby interface board;

[23] The front panel of the main interface board and the standby interface board are connected by a Y-type cable.

The Y cable is connected to the external E1/T1 interface line:

[24] The main interface board and the standby interface board include a relay, and the internal E1/T1 circuit of the main interface board or the standby interface board that is working normally is selectively connected to the external E1 through the relay. The /T1 interface line is connected. [25] A method for implementing an El/Tl interface backup, comprising:

[26] Set the main interface board and the standby interface board that can implement the same function and the primary standby relationship. The front panel of the main interface board and the standby interface board are wired with the Y cable. The Y-type cable is connected to an external E1/T1 interface line, and the main interface board and the standby interface board include a relay;

[27] The internal E1/T 1 circuit of the working main interface board or the standby interface board is selectively connected to the external E1/T1 interface line through the relay.

[28] According to the technical solution provided by the foregoing embodiments of the present invention, the front panel of the main interface board and the standby interface board are connected by a Y-type cable, and the The Y cable is connected to the external E1/T1 interface line. The invention overcomes the defects of the cable connection mode of the main and standby front board and the external E1/T 1 interface line in the prior art, thereby saving transmission resources and reducing operating costs.

[29] BRIEF DESCRIPTION OF THE DRAWINGS

1 is a structural diagram of an apparatus for implementing E1/T1 interface backup according to an embodiment of the present invention;

2 is a flowchart of a method for implementing E1/T1 interface backup according to an embodiment of the present invention;

3 is a schematic structural diagram of a solid state relay used in an embodiment of the present invention;

[33] FIG. 4 is an embodiment of the present invention using a solid state relay

A circuit connection diagram of a device that implements an E1/T1 interface backup;

5 is a schematic structural diagram of a pulse relay used in an embodiment of the present invention;

[35] FIG. 6 is an embodiment of the present invention using a pulse relay

A circuit connection diagram of a device that implements E1/T1 interface backup.

[36] Mode for carrying out the invention

[37] Embodiments of the invention

According to the concept of modular separation, the E1/T1 interface is divided into two parts, in which the digital and active parts are integrated on the front panel, the analog and passive parts are integrated on the rear board, the front panel and the back plug The boards together form an interface board.

1 is a diagram of an embodiment of the present invention

The structure of the device that implements the backup of the E1/T1 interface. As shown in Figure 1, the device has a main interface board 1 and a standby interface board 2. The circuits and structures of the main and backup interfaces are identical. The same function can be completed. After the actual use, the boards of the primary and backup interfaces can be set to be the primary backup. Relationships, that is, any one of the primary and backup interface cards can be used as the primary interface card, and the other is used as the standby interface card to form a complete 1:1 backup relationship. If the main interface board 1 fails or is damaged, the switch is replaced by the standby interface board 2.

[39] As shown in Figure 1, the front panel of the main and standby interface boards is connected by Y-type cable, that is, the signal of the external E1/T1 interface line is input to the main and standby through the front panel. The relays J 1 and J3 of the interface board reach the independent and unaffected transceiver circuits in the main and standby interface boards, and finally reach the E1/T1 interface module in the main and standby interface boards. The signal processed by the E1/T1 interface module of the main and standby interface boards is output to the external El/Tl interface line through relays J2 and J4, where TPSCTL is the relay control signal, which is output by the driver, and the contact switch of the control relay or Select the contact to be turned on.

[40] In the device shown in Figure 1, the internal E1/T1 circuit of only one main interface board is connected to the external E1/T1 interface line at the same time, and the relay interface of the standby interface that is not connected is relayed internally. The wiring arrangement between them constitutes a loopback channel for easy testing. The status of the relay shown in Figure 1 is the normal working state of the current interface board. It can be seen that the main interface board 1 is in the closed state through the control relays Jl, J 2, so that the main interface is single. The internal E1/T1 circuit of the board 1 is connected to the external E1/T1 interface line; and the standby interface board 2 is disconnected by the control relay, so that the E1/T1 circuit of the standby interface board 2 and the external E1/T1 The interface line is disconnected, and the internal interface of the standby interface board 2 constitutes a loopback channel that can be used for testing. In the device shown in Figure 1, only the primary interface board 1 can receive and transmit E 1/T1 signals.

[41] In summary, as shown in FIG. 2, the embodiment of the present invention

The processing procedure of the method for implementing the E1/T1 interface backup includes the following steps:

[42] Step (201): Set the main interface board and the standby interface board that can implement the same function and the primary standby relationship.

[43] The front panel of the main interface board and the standby interface board is connected by a Y-type cable. The Y-type cable is connected to the external E1/T1 interface line, and the main interface board is reserved. The interface board contains relays.

Step (202): When the main interface board is faulty or damaged, the internal E1/T1 circuit of the currently working main interface board is selectively disconnected from the external E1/T1 interface line by the relay, and the standby is performed. The internal E1/T1 circuit of the interface board is connected to the external E1/T1 interface line.

[45] Embodiments of the invention

In the relay, use the relay as the selector switch for the internal E1/T1 circuit of the main and standby interface boards and the external E1/T

1 The connection/disconnection of the interface line is selected. The specific implementation of the present invention will be described in detail below with reference to the specific embodiments:

[46] Select solid state relay for backup:

[47] Embodiments of the invention

The principle structure of the solid state relay used in Figure 3 is shown in Figure 3. Work 吋, add a certain control signal at the A end.

, can control B and C end or B and D end, normal operation 吋, A terminal input control signal makes

B is connected to the C terminal.

[48] Referring to FIG. 4, that is, the embodiment of the present invention using the above solid state relay

The circuit connection diagram of the device that implements the E1/T1 interface backup. The main and backup interface boards require a total of four relays.

[49] Normal operation 吋, as shown in Figure 4, B1 and C1 terminals, B2 and C2 terminals in relays J1 and J2 are respectively connected, D1 and D2 terminals are connected; B3 and D3 terminals in relays J3 and J4, The B4 and D4 terminals are respectively connected, and the D3 and D4 terminals are connected. In this case, the main interface board 1 is in the connected state, the standby interface board 2 is in the disconnected state, and the internal E1/T1 circuit of the standby interface board 2 is A loopback channel is formed, and the test and maintenance of the standby interface board 2 can be performed.

[50] When the main interface board 1 fails or is damaged, the relay signal is controlled by the control signal. The relays J1 and J2 are switched to the B1 and D1 terminals, the B2 and D2 terminals are respectively connected, and the D1 and D2 terminals are connected. In the relays J3 and J4, the switches are switched to the B3 and C3 terminals, the B4 and the C4 terminals are respectively connected, and the D3 and D4 terminals are connected. In this case, the standby interface board 2 is in the ON state, and the main interface board 1 is in the disconnected state. The internal E1/T1 circuit of the main interface board 1 constitutes a loopback channel, and the test and maintenance of the main interface board 1 can be performed.

[51] Among them, the driver for controlling the relay switching control signal can select a triode, or a MOS (Metal-Oxide-Semiconductor, metal-oxide-semiconductor) tube, a Darlington tube, etc., driving method and circuit design It is described in the prior art and will not be repeated here.

In addition, the embodiment of the present invention

It is also possible to use a pulse relay to achieve the same effect as the above-described solid state relay to achieve backup, the present invention Example

The principle structure of the pulse relay used in Figure 5 is as shown in Figure 5. When a forward pulse control signal is applied to the A and B terminals, the C11 and D1 terminals, C12 and D2 terminals can be connected; Adding a reverse pulse control signal 端 allows C21 to be connected to the D1 terminal, C22 and D2 terminals.

[53] Referring to Figure 6, the present invention is described above using the pulse relay described above.

The circuit connection diagram of the device that implements the E1/T1 interface backup. The main and backup interface boards require a total of two relays.

[54] Normal operation 吋, as shown in Figure 6, D11 and C111 terminals, D21 and C121 terminals in relay J1 are respectively connected, C211 and C221 terminals are connected; in relay J2, D12 and C212 terminals, D22 and C222 terminals are respectively On, the C21 2 and C222 terminals are connected. In this case, the main interface board 1 is in the connected state, the standby interface board 2 is in the disconnected state, and the internal E1/T1 circuit of the standby interface board 2 constitutes the loopback. The channel can be tested and repaired on the standby interface board 2.

[55] When the main interface board 1 fails or is damaged, the relay signal is controlled by the control signal. The D11 and C211 terminals, D21 and C221 terminals in the relay J1 are respectively connected, and the C211 and C221 terminals are connected. In the relay J2 D12 and C112 are connected, and the D22 and C122 are respectively connected. C212 and C222 are connected. In this case, the standby interface board 2 is in the ON state, the main interface board 1 is in the disconnected state, and the main interface board is in the open state. The internal E1/T1 circuit of 1 constitutes a loopback channel, and the test and maintenance of the main interface board 1 can be performed.

[56] Among them, the driver for controlling the relay switching control signal can select a triode, or a MOS tube, a Darlington tube, etc. The driving method and circuit design are described in the prior art, and are not heavy here. Said.

[57] In the embodiment of the present invention, the front panel of the main interface board and the standby interface board are connected by a Y-type cable, and the Y-type cable is connected to the external E1/T1. Line connection. It overcomes the shortcomings of the prior art that the cable connection mode of the main and standby front board and the external E1/T1 interface line is not provided, thereby saving transmission resources and reducing operating costs.

The embodiment of the present invention provides a loopback function of the standby interface board, which improves the testability of the board, thereby improving the stability of the system.

[59] In the embodiment of the present invention, the transceivers of the main and standby interface boards are all provided with relays to avoid receiving E1/T1 signals. The transformers in the E1/T1 interface module are connected in parallel to affect the receiving capability of the E1/T1 signals, and the same can be avoided. The lightning striker will destroy the E1/T1 port of the main and standby interface boards, and the anti-lightning performance will be greatly improved, avoiding major accidents such as downtime.

[60] The hardware switching in the embodiment of the present invention is fast, and the service interruption is minimized.

[61] The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of within the technical scope disclosed by the present invention. Changes or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim

[1] 1. A device for backing up an El/Tl interface, comprising: a primary interface card and a standby interface card;

The front panel of the main interface board and the standby interface board are connected by a Y-type cable, and the Y-type cable is connected to an external E1/T1 interface line;

The main interface board and the standby interface board include a relay, and the internal E1/T1 circuit of the active interface board or the standby interface board that is working normally is selectively connected to the external E1/T1 interface through the relay. The line is connected.

[2] 2. The device for implementing E1/T1 interface backup according to claim 1, wherein: the relay comprises a solid state relay or a pulse relay.

[3] The device for implementing the E1/T1 interface backup according to claim 1, further comprising: a driver, configured to send a control signal to the relay, and the relay is selectively controlled by the control signal The internal E1/T1 circuit of the active interface board or the standby interface board that is working normally is connected to the external E1/T1 interface line.

[4] 4. The device for implementing E1/T1 interface backup according to claim 3, wherein the driver comprises: a triode, a MOS tube or a Darlington tube.

[5] The device for implementing the backup of the E1/T1 interface according to claim 1, wherein: the internal E1/T1 circuit of the active interface board or the standby interface board that does not currently work through the relay The wiring arrangement constitutes a loopback channel.

[6] 6. A method for implementing E1/T1 interface backup, which is characterized in that:

The main interface board and the standby interface board that can implement the same function and are in the main standby relationship. The front panel of the main interface board and the standby interface board are connected by Y cable.

The Y-type cable is connected to an external E1/T1 interface line, and the main interface board and the standby interface board include a relay;

The internal E1/T1 circuit of the working main interface board or the standby interface board is selectively connected to the external E1/T1 interface line through the relay.

[7] 7. The method for implementing the backup of the E1/T1 interface according to claim 6, wherein: the relay is used to selectively perform the current working interface of the primary interface or the standby interface. The connection of the El/Tl circuit to the external El/Tl interface line is accomplished by the driver transmitting a control signal to the relay.

[8] 8. The method for implementing the backup of the E1/T1 interface according to claim 6, further comprising: configuring, by using the wiring of the relay, the main interface board or the standby interface that is not currently working. The internal E1/T1 circuit of the board forms a loopback channel.

[9] 9. The method for implementing E1/T1 interface backup according to any one of claims 6 to 8, characterized in that

The main interface board and the standby interface board include mutually independent transceiver circuits and E1/T1 connections.

□ Module.

[10] The method for implementing the E1/T1 interface backup according to claim 9, wherein the method further comprises:

The signal of the external E1/T1 interface line is input to the independent transceiver circuit and the E1/T1 interface module in the main interface board and the standby interface board through the Y-type cable; The signal processed by the E1/T1 interface module of the board or the standby interface board is output to the external E1/T1 interface line through the Y cable.