WO2016192504A1

WO2016192504A1 - Method for realizing disaster recovery communications, station device and system

Info

Publication number: WO2016192504A1
Application number: PCT/CN2016/081017
Authority: WO
Inventors: 韩淑玲; 徐劲松; 余辰东
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-06-05
Filing date: 2016-05-04
Publication date: 2016-12-08
Also published as: CN106301713B; CN106301713A

Abstract

A method for realizing disaster recovery communications, a station device and a system. The method comprises: establishing communication connections among different station devices through a preset extending interface; and generating routing communication information corresponding to each station device through network topology information about all station devices and the established communication connections; and the method also comprises: when disaster recovery communications cannot be conducted since a kernel layer and/or a transport layer are/is abnormal, conducting disaster recovery communications of station devices on the established communication connections through the generated routing communication information.

Description

Method, site equipment and system for implementing disaster tolerance communication

Technical field

This document refers to, but is not limited to, disaster recovery protection technologies, especially a method, site equipment and system for implementing disaster recovery communication.

Background technique

With the retreat of traditional Time Division Multiplexing (TDM), Next Generation Network (NGN) has become popular in common commercial networks. Railways, rail transit, etc. have high reliability requirements for equipment, and require equipment to provide a special network for protection calls, that is, disaster recovery call functions under abnormal conditions, and are increasingly upgraded to NGN. NGN is a comprehensive broadband network platform system that provides softswitch (Soft Switch) technology as the core and provides multimedia services such as voice, video and data. As a layered fully open network, NGN adopts a technology in which services are separated from call control and separated from call control and bearer. The provision of services through the technology is not limited to the underlying network, and the service is independent of the network. Softswitch technology plays an important role in NGN because of its open architecture, packet transmission, and multiple access modes. It has gradually become the mainstream technology from traditional circuit switching to packet switching.

FIG. 1 is a schematic diagram of a network composition of a related art private network. As shown in FIG. 1 , in order to implement a disaster recovery communication (including at least a call) function, a media layer control layer (MGC, Media Gateway Control) of a core layer is set to pass hot standby. The backup mode works by setting up redundant MGC devices; the transport layer, ie Ethernet, is set to work by setting the loop to the dual path. The related network structure only performs disaster recovery protection for each device in the core layer and the transport layer, and does not perform disaster recovery protection settings when the core layer or the transport layer is completely invalid; although Ethernet improves its use in various ways. Reliability, but the characteristics and openness of Ethernet itself make the network still have other abnormal conditions. For example, an abnormality caused by a network device being attacked, a natural disaster causing an abnormality that cannot be communicated with an access gateway (AG, Access Gateway), and/or an MGC, an abnormality of the MGC device itself, or an abnormality that cannot be operated due to the device itself, The site devices cannot communicate with each other through the core layer and the transport layer. The disaster recovery protection for the core layer and the transport layer cannot implement disaster recovery communication.

In summary, the related core layer and the transport layer's disaster recovery protection method cannot implement the disaster recovery communication function for the above-mentioned abnormal conditions, which affects the service processing of the private network.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiments of the present invention provide a method, a site device, and a system for implementing disaster-tolerant communication, which can perform disaster recovery protection when the disaster recovery protection of the core layer and the transport layer cannot implement the disaster recovery communication function, and ensure normal processing of the private network service.

An embodiment of the present invention provides a method for implementing disaster-tolerant communication, including: a site device establishes a communication connection with other site devices through a preset expansion interface; and communicates with the network topology information and established communication with other site devices. The connection generates routing communication information corresponding to other site devices; it also includes:

When the core layer and/or the transport layer are abnormal and cannot perform disaster-tolerant communication, the generated routing communication information is used to perform disaster-tolerant communication of the site device with other site devices on the established communication connection.

Optionally, establishing a communication connection with other site devices includes:

A communication connection is established with all the adjacent site devices through the preset expansion interface to implement a communication connection with other site devices.

Optionally, the preset expansion interface is an external switching office FXO interface;

The communication connection is a communication connection between the FXO interface of the site device and the external exchange station FXS interface of the adjacent site device through a twisted pair.

Optionally, routing communication information includes:

When the site device is called, all the communication directions of all the called site devices, the site device addresses of the near and far site devices in all communication directions, and the information of the communication directory numbers of the terminals corresponding to all the site device addresses.

Optionally, performing disaster recovery communication of the site device includes:

When the calling device generates the calling communication, according to the generated routing communication information corresponding to itself, on the established communication connection,

According to the communication direction of the called site device, the network device is connected to the corresponding site device according to the site device address step by step, and each site is compared according to the site device address. Establishing a communication connection number of the terminal in the device until the communication record number of the called terminal is compared, establishing a communication connection between the site device of the calling party and the terminal of the called site device, and performing disaster recovery of the site device Communication.

Optionally, the method further includes:

When connecting from near to far to the corresponding site device step by step,

Determining whether the core device and the transport layer of the site device connected to the device are abnormal and cannot perform disaster-tolerant communication. If no abnormality is available for disaster-tolerant communication, the communication connection between the core layer and the transport layer is used for disaster-tolerant communication; The core layer and/or the transport layer are abnormally unable to perform disaster-tolerant communication, and the communication connection is performed through the disaster-tolerant communication of the site device.

The embodiment of the invention further discloses a site device for implementing disaster recovery communication, comprising: an interface unit, a communication routing unit, and a disaster recovery communication unit; wherein

The interface unit is configured to establish a communication connection with other site devices through a preset expansion interface;

a communication routing unit configured to generate routing communication information with other site devices by using network topology information with other site devices;

The disaster recovery communication unit is configured to perform disaster recovery communication with the site device through the generated route communication information when the core layer and/or the transport layer are abnormal and cannot perform disaster recovery communication.

Optionally, the communication routing unit is set to,

When a communication connection is established with all the adjacent site devices through the preset expansion interface, the communication direction of all called site devices is generated by using network topology information of other site devices, and all communication directions are near and The site device address of the far site device, and the information of all the site device addresses corresponding to the terminal's address book number.

Optionally, the disaster recovery communication unit is configured to perform disaster recovery communication when an abnormality occurs in the core layer and/or the transport layer.

Each of the site devices, according to the generated routing communication information, when the calling communication occurs,

According to the communication direction of the called site device, the network device is connected to the corresponding site device according to the site device address step by step, and each site device is compared according to the site device address. The communication record number of the internal terminal is established until the communication record number of the called terminal is compared, and the communication connection between the site device of the calling party and the terminal of the called site device is established, and the disaster recovery communication of the site device is performed.

An embodiment of the present invention further provides a system for implementing disaster recovery communication, including a plurality of site devices.

Each site device includes an interface unit, a communication routing unit, and a disaster recovery communication unit;

The interface unit is configured to establish a communication connection with other site devices in the network through the preset extended interface;

a communication routing unit configured to generate routing communication information with other site devices by using network topology information with all site devices;

The disaster recovery communication unit is configured to perform disaster recovery communication of the site device with other site devices in the network through the generated routing communication information when the core layer and/or the transmission layer are abnormal and cannot perform disaster recovery communication.

Optionally, the interface unit is set to,

Establishing a communication connection with the adjacent station device through the preset expansion interface.

Optionally, the communication routing unit is set to,

Through the network topology information of other site devices in the network, the communication direction of all called site devices, the site device addresses of the near and far site devices in all communication directions, and the address book number of the terminal corresponding to all site device addresses are generated. Routing communication information.

Optionally, the disaster recovery communication unit is configured to be unable to perform disaster recovery communication when the core layer and/or the transport layer are abnormal.

When the site device generates the calling communication, according to the generated routing communication information,

According to the communication direction of the called site device, the near-to-far communication is connected to the corresponding site device according to the site device address, and the communication record number of the terminal in each site device is compared according to the site device address. When the communication record number of the called terminal is compared, a communication connection with the terminal of the called site device is established, and the disaster recovery communication of the site device is performed.

Optionally, the site device further includes a determining unit, configured to receive the communication connection of the calling site device,

It is judged whether the core layer and the transport layer are abnormal and cannot be used for disaster recovery communication. If no abnormality is available for disaster recovery communication, the communication connection between the core layer and the transport layer is used for disaster recovery communication; if the core layer and/or the transport layer If the abnormality occurs, the disaster-tolerant communication cannot be performed, and the communication connection is performed through the disaster-tolerant communication of the site device of the disaster recovery communication unit.

Compared with the related art, the technical solution of the embodiment of the present invention includes: establishing a communication connection between devices at each site through a pre-set expansion interface; generating corresponding device devices by using network topology information of all site devices and establishing a communication connection The routing communication information is further included: when the core layer and/or the transport layer are abnormal, the disaster-tolerant communication cannot be performed, and the disaster-tolerant communication of the site device is performed on the established communication connection by using the generated routing communication information. The method of the embodiment of the present invention establishes a communication connection and a generated routing communication information of each site device by using an extended interface, and implements disaster recovery communication of the site device when the core layer and/or the transport layer are abnormally unable to perform disaster recovery communication.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a schematic diagram of a network composition of a related art private network;

2 is a flowchart of a method for implementing disaster tolerance communication according to an embodiment of the present invention;

3 is a structural block diagram of a site device for implementing disaster tolerance communication according to an embodiment of the present invention;

4 is a structural block diagram of a system for implementing disaster tolerant communication according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a network structure of a related art disaster recovery communication;

FIG. 6 is a schematic diagram of implementing disaster recovery communication of a site device according to the first embodiment of the present invention; FIG.

Figure 7 is a schematic view of a second embodiment of the present invention;

Figure 8 is another schematic view of a second embodiment of the present invention.

Embodiments of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

2 is a flowchart of a method for implementing disaster tolerance communication according to an embodiment of the present invention. As shown in FIG. 2, the method includes:

Step 200: Establish a communication connection with other site devices through a preset expansion interface.

In this step, establishing a communication connection with other site devices includes:

A communication connection with other neighboring site devices is established through a pre-configured expansion interface to implement a communication connection with other site devices.

It should be noted that in a private network, a site device may establish a communication connection with multiple adjacent site devices, such as a site device of a primary transfer site in a subway private network, a site device of a primary monitoring site, and the like. The device and the neighboring device of the different lines need to establish a communication connection to perform the disaster-tolerant communication of the site device in the embodiment of the present invention.

Specifically, how to establish a communication connection with all the adjacent site devices through the preset expansion interface can be implemented by using a well-known technology of the present invention, and is not intended to limit the scope of protection of the present invention, and details are not described herein again.

Optionally, the pre-configured extension interface includes a Foreign Exchange Office (FXO) interface or a Primary Rate Interface (PRI), and the FXO interface is connected to an external exchange station of the adjacent station device (FXS, Foreign) Exchange Station); the PRI is connected to the PRI of the neighboring site device.

The communication connection includes a communication connection between the FXO interface of the site device through the twisted pair and the external exchange station FXS interface of the adjacent site device; or the PRI of the site device through the optical path and the PRI of the adjacent site device.

The site device implements the calling through the FXO interface, implements the called by the FXS interface, or implements the calling by PRI, and implements the called by PRI.

It should be noted that since the rail transit carries out disaster-tolerant communication, it is necessary to ensure the stability and reliability of the communication. Therefore, the physical connection is generally used for communication, and the twisted pair is laid at the wall position of the rail transit.

Step 201: Generate routing communication information corresponding to other site devices by using network topology information and established communication connections with other site devices.

In this step, the routing communication information includes:

When the site device is called, all the communication directions of all the called site devices, the site device addresses of the near and far site devices in all communication directions, and all the site device addresses correspond to the terminals. Information on the number of the directory.

It should be noted that step 200 and step 201 may be performed only once before step 202 is performed, and step 202 is processed according to the processing results of step 200 and step 201 for each occurrence of disaster recovery communication.

Step 202: When the core layer and/or the transport layer are abnormal and cannot perform disaster-tolerant communication, perform disaster-tolerant communication of the site device with other site devices on the established communication connection by using the generated route communication information.

It should be noted that the method for determining that the core layer and the transport layer are abnormal and unable to perform disaster recovery communication is a conventional technical means of those skilled in the communication field, and details are not described herein again.

In this step, the disaster recovery communication of the site device includes:

According to the communication direction of the called site device, the near-to-far communication is connected to the corresponding site device according to the site device address, and the communication directory number of the terminal in each site device is compared according to the site device address until the comparison is performed. When the called terminal's address book number is established, a communication connection between the calling site device and the called site device terminal is established, and the site device's disaster-tolerant communication is performed.

When the method is connected to the corresponding site device in a stepwise manner, the method in the embodiment of the present invention further includes:

It is judged whether the core device and the transport layer of the connected device are abnormal. The disaster recovery communication cannot be performed. If no abnormality is available for disaster recovery communication, the communication connection between the core layer and the transport layer is used for disaster recovery communication; if the core layer If the transmission layer is abnormal, the disaster recovery communication cannot be performed, and the communication connection is performed through the disaster recovery communication of the site device.

It should be noted that, in actual application, all site devices store the generated routing communication information corresponding to itself, and perform disaster recovery communication of the site device on the established communication connection according to the stored routing communication information corresponding to itself. .

The method of the embodiment of the present invention establishes a communication connection between the different site devices and the generated routing communication information by using the extended interface, and implements disaster recovery communication of the site device when the core layer and/or the transport layer are abnormally unable to perform disaster recovery communication.

FIG. 3 is a structural block diagram of a site device for implementing disaster tolerance communication according to an embodiment of the present invention, as shown in FIG. 3 The indication includes: an interface unit, a communication routing unit, and a disaster recovery communication unit; wherein

Optionally, the communication routing unit is set to,

When a communication connection is established with all adjacent site devices through a pre-configured expansion interface, the communication direction of all called site devices and the site devices of all the communication directions from near to far are generated through network topology information with other site devices. The site device address and all site device addresses correspond to the terminal's directory number information.

Optionally, the disaster recovery communication unit is configured to be unable to perform disaster recovery communication when an abnormality occurs in the core layer and/or the transport layer.

When the calling communication occurs, according to the generated routing communication information,

According to the communication direction of the called site device, the near-to-far communication is connected to the corresponding site device according to the site device address, and the communication directory number of the terminal in each site device is compared according to the site device address until the comparison is performed. When the called party's address book number is established, a communication connection between the calling site device and the terminal of the called site device is established, and the disaster recovery communication of the site device is performed.

4 is a structural block diagram of a system for implementing disaster recovery communication according to an embodiment of the present invention. As shown in FIG. 4, the device includes a plurality of site devices.

Optionally, the interface unit is configured to establish a communication connection with the adjacent site device through the preset extended interface.

Optionally, the communication routing unit is configured to: when the interface unit establishes a communication connection with the adjacent site device through the preset expansion interface,

The optional disaster recovery communication unit is configured to perform disaster recovery communication when the core layer and/or the transport layer are abnormal, and the interface unit establishes a communication connection with the adjacent site device through the preset expansion interface.

According to the communication direction of the called site device, the near-to-far communication is connected to the corresponding site device according to the site device address, and the communication directory number of the terminal in each site device is compared according to the site device address until the comparison is performed. When the called terminal's address book number is established, a communication connection with the terminal of the called site device is established, and disaster recovery communication of the site device is performed.

It is judged whether the core layer and the transport layer are abnormal and cannot be used for disaster recovery communication. If no abnormality is available for disaster recovery communication, the communication connection between the core layer and the transport layer is used for disaster recovery communication; if the core layer and/or the transport layer If an abnormality occurs, the disaster-tolerant communication cannot be performed, and the communication connection is performed through the disaster-tolerant communication of the site device of the disaster recovery communication unit.

The method of the present invention is described in detail below by way of specific examples, which are merely used to illustrate the invention and are not intended to limit the scope of the method of the invention.

Example 1

FIG. 5 is a schematic diagram of a network structure of a related art disaster recovery communication, as shown in FIG. 5, which is included in the network. There are core layer, transport layer and site devices 1 to 5, where the core layer includes the MGC, and the transport layer includes the Ethernet transport network. The site devices 1 to 5 are distinguished by the IP address of the site device in actual applications, in order to briefly describe the network. As a result, site devices with different numbers correspond to different site device addresses. The DR communication process between the site device 1 and the station site device 3 is controlled by the MGC and the AG is transmitted through the Ethernet. The DR communication process refers to the call process. When the site device 1 does not have abnormal communication with the MGC and the site device 3, that is, when the MGC and the site device 1, the MGC, and the site device 3 have no communication abnormality, the disaster recovery communication function is implemented through the core layer and the transport layer.

When the core layer and/or the transport layer are abnormal and cannot perform disaster-tolerant communication, the site device 1 and the site device 3 perform disaster-tolerant communication by using the disaster-tolerant communication method of the site device in the embodiment of the present invention.

Before the call process is performed on the disaster recovery communication of the site device, the FXS interface of all the adjacent site devices needs to be established through the extended FXO interface, and the physical connection can be made through the twisted pair. Since the disaster-tolerant communication for railways, rail transits, etc. is mainly for disaster-tolerant communication of adjacent site devices, it is only necessary to connect adjacent site devices through twisted pairs. Of course, if there are important site devices, such as transit site devices, and need to establish connections with neighboring site devices on multiple lines, you can directly establish connections with multiple adjacent site devices as needed, which can be more Communicate quickly.

After the communication connection of the site device is established, the communication direction of all the site devices is all generated when the disaster recovery communication of the site device is generated for all the site devices through the network topology information of all the site devices and the established communication connection. The routing device information of the site device address of the near and far site devices in the communication direction and the address book number of all the site device addresses corresponding to the terminal.

Table 1 is the address book number of the site device and the terminal device in the site device included in the network topology.

Table 1

Taking the private network of the subway as an example, by analyzing the network topology, it is also possible to determine the location of the called site device when the site device performs disaster recovery communication, and by determining the corresponding coordinate direction, each called site device can be defined. Communication direction. Table 2 is the routing communication information generated based on the network of FIG. 5, wherein the communication direction of the site device call is determined according to the direction of the subway target station, and the site device address of each near and far site device in each communication direction, and each site The device address corresponds to the routing communication information of the terminal's address book number. D1 is the communication direction in which the site device number is incremented, and d2 is the communication direction in which the site device number is decremented.

Table 2

When the adjacent AG devices are unable to communicate with the MGC for disaster-tolerant communication, for example, the user of the site device 1 calls the terminal device 2 with the address book number 68895008, and the AG cannot communicate with the MGC for disaster-tolerant communication. FIG. 6 is a schematic diagram of implementing disaster-tolerant communication of a site device according to the first embodiment of the present invention. As shown in FIG. 6, the routing information of the site device 1 is determined by the routing information of the site device 1, and the communication direction of the called site device 2 is determined as d1. In the direction, the site device address of the near and far site device is communicatively connected to the site device 2, and 68895008 is determined as the address book number of the terminal in the site device 2 according to the address book number of the terminal corresponding to each site device address, and the site device 1 is FXO's expansion interface and the FXS port of the site device 2, the site device 1 and the site device 2 have the address book number 68895008, and the terminal with the address book number 68895008 is off-hook to connect the line to realize the disaster recovery of the site device. Communication.

The disaster recovery communication implementation process of the neighboring site devices is the same.

Example 2

In this embodiment, the disaster-tolerant communication of the site device between non-neighboring site devices is clearly and in detail described. The disaster recovery communication between the site device 1 and the site device 4, for example, when the user of the site device 1 calls the terminal with the address book number 68895015 in the site device 4, when the site device 1 determines that the communication with the MGC is abnormal,

Determining, by the routing information of the site device 1, the communication direction of the called site device 2 is d1, and is connected to the site device 2 through the site device address of the near and far site devices in the communication direction, and corresponding to the terminal device according to the site device address. The address book number determines that the terminal whose address book number is 68895015 is not the terminal of the station device 2, and therefore continues to connect to the site device 3; comparing the address book numbers in the site device 3, it is found that the called party is not the terminal in the site device 3;

It is assumed that the site device 3 and the MGC are in normal communication, and the disaster recovery communication can be performed through the MGC at this time, or the call processing can be performed through the disaster recovery communication method of the site device of the present invention.

FIG. 7 is a schematic diagram of a second embodiment of the present invention. As shown in FIG. 7, before the site device 3, the disaster-tolerant communication of the site device is performed by using the d1 direction connection in the figure, and the communication between the site device 3 and the MGC is normal. The MGC performs subsequent connection and disaster recovery communication, and the network transmission through the MGC for disaster recovery communication is shown by the dotted line in the figure.

FIG. 8 is another schematic diagram of the second embodiment of the present invention. As shown in FIG. 8, the entire disaster tolerance communication process is completed through a communication connection of the expansion interface. Although the communication between the site device 3 and the MGC is normal, the extended communication connection is still adopted, that is, the site device 3 and the site device 4 continue to communicate through the extended interface. When calling to the site device 4, the address book number in the site device 4 is compared. The terminal with the address book number 68895515 is in the site device 4, and the terminal with the address book number 68895015 is off-hook to connect the line to realize the disaster-tolerant communication of the site device.

Embodiments of the present invention also provide a computer readable storage medium storing computer executable instructions for performing any of the methods described above.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct related hardware, such as a processor, which may be stored in a computer readable storage medium, such as a read only memory, disk or optical disk. Wait. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program in a storage and a memory by a processor. / instruction to achieve its corresponding function. The invention is not limited to any specific form of combination of hardware and software.

While the embodiments of the present invention have been described above, the described embodiments are merely for the purpose of understanding the invention and are not intended to limit the invention. Any modification and variation in the form and details of the embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention. The scope defined by the appended claims shall prevail.

Industrial applicability

The above technical solution implements disaster recovery communication of the site device when the core layer and/or the transport layer are abnormal and cannot perform disaster recovery communication.

Claims

A method for implementing disaster-tolerant communication includes: establishing, by a site device, a communication connection with other site devices through a preset expansion interface; generating and communicating with other site devices through network topology information and established communication connections with other site devices Corresponding routing communication information; also includes:

When the core layer and/or the transport layer are abnormal and cannot perform disaster-tolerant communication, the generated routing communication information is used to perform disaster-tolerant communication of the site device with other site devices on the established communication connection.
The method of claim 1 wherein said establishing a communication connection with other site devices comprises:

A communication connection is established with all the adjacent site devices through the preset expansion interface to implement a communication connection with other site devices.
The method according to claim 1 or 2, wherein the pre-set extension interface comprises an external exchange FXO interface;

The communication connection includes a communication connection between the FXO interface of the site device and the external exchange station FXS interface of the adjacent site device through a twisted pair.
The method of claim 1 or 2, wherein the routing communication information comprises:

When the site device is called, all the communication directions of all the called site devices, the site device addresses of the near and far site devices in all communication directions, and the information of the communication directory numbers of the terminals corresponding to all the site device addresses.
The method of claim 4, wherein the performing disaster tolerant communication of the site device comprises:

When the calling device generates the calling communication, according to the generated routing communication information corresponding to itself, on the established communication connection,

According to the communication direction of the called site device, the near-to-far communication is connected to the corresponding site device according to the site device address, and the communication record of the terminal in each site device is compared according to the site device address. The number is up until the communication record number of the called terminal is compared, and the communication connection between the site device of the calling party and the terminal of the called site device is established, and the disaster recovery communication of the site device is performed.
The method of claim 5, further comprising:

When the near and far are connected step by step to the corresponding site device,

Determining whether the core device and the transport layer of the site device connected to the device are abnormal and cannot perform disaster-tolerant communication. If no abnormality is available for disaster-tolerant communication, the communication connection between the core layer and the transport layer is used for disaster-tolerant communication; The core layer and/or the transport layer are abnormally unable to perform disaster-tolerant communication, and the communication connection is performed through the disaster-tolerant communication of the site device.
A site device for implementing disaster recovery communication, comprising: an interface unit, a communication routing unit, and a disaster recovery communication unit; wherein

The interface unit is configured to establish a communication connection with other site devices through a preset expansion interface;

a communication routing unit configured to generate routing communication information with other site devices by using network topology information with other site devices;

The disaster recovery communication unit is configured to perform disaster recovery communication with the site device through the generated route communication information when the core layer and/or the transport layer are abnormal and cannot perform disaster recovery communication.
The site device according to claim 7, wherein said communication routing unit is configured to

When the communication connection is established with all the adjacent site devices through the preset expansion interface, the communication direction of all the called site devices is generated by using the network topology information of the other site devices, and all communication directions are near and far. The site device address of the site device and the information of all the site device addresses corresponding to the terminal's address book number.
The site device according to claim 7 or 8, wherein the disaster recovery communication unit is configured to be unable to perform disaster recovery communication when an abnormality occurs in the core layer and/or the transport layer.

When the calling communication occurs, according to the generated routing communication information,

According to the communication direction of the called site device, the near-to-far communication is connected to the corresponding site device according to the site device address, and the communication record number of the terminal in each site device is compared according to the site device address. When the communication record number of the called terminal is compared, a communication connection with the terminal of the called site device is established, and the disaster recovery communication of the site device is performed.
A system for implementing disaster recovery communication, including a number of site devices,

Each site device includes an interface unit, a communication routing unit, and a disaster recovery communication unit;

The interface unit is configured to establish a communication connection with other site devices in the network through the preset extended interface;

a communication routing unit configured to generate routing communication information with other site devices by using network topology information with all site devices;

The disaster recovery communication unit is configured to perform disaster recovery communication of the site device with other site devices in the network through the generated routing communication information when the core layer and/or the transmission layer are abnormal and cannot perform disaster recovery communication.
The network of claim 10, wherein the interface unit is configured to

Establishing a communication connection with the adjacent station device through the preset expansion interface.
The network according to claim 10 or 11, wherein said communication routing unit is configured to

Through the network topology information of other site devices in the network, the communication direction of all called site devices, the site device addresses of the near and far site devices in all communication directions, and the address book number of the terminal corresponding to all site device addresses are generated. Routing communication information.
The network according to claim 12, wherein the disaster recovery communication unit is configured to be unable to perform disaster recovery communication when an abnormality occurs in the core layer and/or the transport layer.

When the calling communication occurs, according to the generated routing communication information,

According to the communication direction of the called site device, the near-to-far communication is connected to the corresponding site device according to the site device address, and the communication record number of the terminal in each site device is compared according to the site device address. When the communication record number of the called terminal is compared, a communication connection with the terminal of the called site device is established, and the disaster recovery communication of the site device is performed.
The network according to claim 13, wherein the site device further comprises a judging unit configured to receive a communication connection of the calling site device,

It is judged whether the core layer and the transport layer are abnormal, and the disaster-tolerant communication cannot be performed. If there is no abnormality, the disaster-tolerant communication cannot be performed, and the communication connection between the core layer and the transport layer is used to perform disaster-tolerant communication; If the core layer and/or the transport layer are abnormal, the disaster-tolerant communication cannot be performed, and the communication connection is performed through the disaster-tolerant communication of the site device of the disaster recovery communication unit.