WO2001008355A1

WO2001008355A1 - Interconnection communication system and method

Info

Publication number: WO2001008355A1
Application number: PCT/JP1999/004001
Authority: WO
Inventors: Takashi Wakamatsu; Eiji Sugawara; Makiko Suzuki; Yasuo Ueda
Original assignee: Fujitsu Limited
Priority date: 1999-07-26
Filing date: 1999-07-26
Publication date: 2001-02-01

Abstract

A high-quality communication is implemented by efficiently housing a plurality of AN devices in one V5 interface. An identification number holding means (21) holds an identification number for identifying itself. An identification number judging means (22) extracts an identification number from down communication information and judges it for matching with its own identification number. A down communication information acquisition means (23), if matched, captures the down communication information and processes it. The communication information relay means (24), if not matched, relays the down communication information to another device, or, when up communication information is received from another device, relays it. A down communication information transmitting means (11) inserts an identification number to be transmitted of an access network device to generate down communication information and transmit it. An up communication information receiving means (12) receives up communication information from the access network device and processes it.

Description

Description Interconnection communication system and interconnection communication method

The present invention relates to an interconnection communication system and an interconnection communication method, and more particularly to an interconnection communication system for interconnecting and communicating with a V5 interface and an interconnection communication method for interconnecting and communicating with a V5 interface. About. Background art

As an international standard interface for telephone network data communication, the V series recommendation is defined by ITU-T and ETSI. In particular, the V5 interface in the V series recommendation is between the LE (Local Exchange) and the equipment in the AN (Access Network) (hereinafter referred to as AN equipment). This is an open-source product specification, and LE vendors and AN vendors can freely combine different vendors by conforming to the specifications.

FIG. 11 is a diagram showing a schematic system configuration of the V5 interface. An example is shown in which AN devices 201 to 204 in AN 200 are connected in a ring topology.

LE100 and AN device 201 are connected by an E1 link (2 Mbps) L line (up to 16 lines can be connected to one AN device). The specification of the open interface between LE100 and AN200 is the V5 interface.

Each of the AN devices 201 to 204 has an analog telephone, ISDN Digital terminals such as BRA (Basic Rate Access: 2B + D basic interface) and ISDN-PRI (Primary Rate Interface: 30B + D or 31BZD primary rate interface), or PAB X (automatic type) Private branch exchange: Private Automatic Branch Exchange) is connected. On the other hand, the call processing signal between LE 100 and AN 200 is a V5 protocol (hereinafter referred to as a LAPV 5 communication protocol) that uses the ISDN—LAPD (Link Access Protocol On The D Channel) communication protocol. ), And control of the LAP V5 communication protocol is performed between the LE 100 and the AN devices 201 to 204 through the E1 link L.

However, in a system using the conventional V5 interface as described above, if a new AN device is introduced to accommodate new subscribers, it is necessary to newly add an E1 link dedicated to the new AN device. There was a problem.

FIG. 12 is a diagram showing a system configuration when a new AN device is introduced. <As shown in the figure, a new AN device 205 is introduced into the system shown in FIG.

In this case, the communication between the new AN device 205 and the LAP V5 communication protocol is required between LE 100 and AN 200 (ie, between LE 100 and AN device 201). A new E1 link La (maximum 16) must be added.

In other words, in a conventional V5 interface system, the LAPV5 communication protocol exchanged between LE100 and AN200 is 1: 1 (one £: one AN device) communication. Therefore (in the past, one V5 interface could only accommodate one AN device), so it was necessary to add an E1 link for each AN device in AN200.

In this way, when a new AN device is introduced, its LAP V5 communication In order to establish the port protocol, the existing E1 link cannot be shared, so a new E1 link had to be added, and there was a problem when the additional cost was required. Disclosure of the invention

The present invention has been made in view of such a point, and provides an interconnected communication system that efficiently accommodates a plurality of AN devices in one V5 interface and performs high-quality communication. The purpose is to:

Another object of the present invention is to provide an interconnection communication method for efficiently accommodating a plurality of AN devices in one V5 interface and performing high-quality communication.

According to the present invention, in order to solve the above-described problem, in an interconnected communication system 1 for interconnecting and communicating with a V5 interface as shown in FIG. 1, an identification holding an identification number for identifying itself is provided. Number holding means 21; identification number extracting means 22 for extracting the identification number from the downstream communication information to determine whether or not it matches its own identification number; Downlink communication information acquisition means 23 for processing, and communication information relay means 24 for relaying downlink communication information to another device if they do not match, or relaying uplink communication information when receiving uplink communication information from another device And a plurality of access network devices 20a to 20n each comprising: an identification number of an access network device to be communicated, and generating and transmitting downlink communication information. 1 1 Upstream communication information receiving means 12 for receiving upstream communication information from the access network devices 20a to 20n, extracting an identification number, and performing processing corresponding to each access network device; And an exchange 10 interconnected with the access network device 20a by one V5 interface. System 1 is provided.

Here, the identification number holding means 21 holds an identification number for identifying itself. The identification number determining means 22 extracts the identification number from the downlink communication information and determines whether or not it matches its own identification number. The downlink communication information acquisition means 23 fetches and processes the downlink communication information if they match. The communication information relay means 24 relays the downlink communication information to another device when the values do not match, or relays the uplink communication information when receiving the uplink communication information from the other device. The downstream communication information transmitting means 11 generates and transmits downstream communication information by inserting the identification number of the access network device to communicate with. The upstream communication information receiving means 12 receives the upstream communication information from the access network devices 20a to 20n, extracts an identification number, and performs a process corresponding to each access network device. .

Also, in an interconnected communication method for interconnecting and communicating via a V5 interface as shown in FIG. 10, the exchange exchange side inserts an identification number of an access network device to communicate with to generate downlink communication information. The access network device extracts the identification number from the downstream communication information, determines whether or not it matches its own identification number, and if so, fetches and processes the downstream communication information. If they do not match, the downstream communication information is relayed to the other device, and if the upstream communication information is received from the other device, the upstream communication information is relayed to the exchange to establish the interconnection between the exchange and the access network device. An interconnect communication method is provided.

Here, an identification number is retained for each of a plurality of access network devices, and if the downlink communication information has its own identification number, it is captured and processed. If the downlink communication information does not have its own identification number, it is processed. Relays to other devices.

The foregoing and other objects, features and advantages of the invention will be apparent from the following description, taken in conjunction with the accompanying drawings, which illustrate preferred embodiments of the invention. Will be. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram showing the principle of the interconnection communication system of the present invention.

FIG. 2 is a diagram showing a format configuration of the downlink communication information Ds.

FIG. 3 is a diagram showing a detailed format of EFA.

Figure 4 shows the protocol and architecture.

Fig. 5 shows a case where AN devices are connected in a ring.

FIG. 6 is a diagram showing the flow of communication information when a failure occurs.

FIG. 7 is a diagram showing a flow of communication information in a normal state.

FIG. 8 is a diagram illustrating path setting when a failure occurs.

FIG. 9 is a diagram illustrating path setting when a failure occurs.

FIG. 10 is a diagram showing a processing procedure of the interconnection communication method of the present invention.

FIG. 11 is a diagram showing a schematic system configuration of the V5 interface. Fig. 12 is a diagram showing the system configuration when a new AN device is introduced. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a principle diagram of the interconnection communication system of the present invention. The interconnection communication system 1 is composed of an exchange (LE) 10 and access network devices (AN devices) 20 a to 20 n in an access network (AN) 200.

The AN devices 20a to 20n are connected linearly in the figure. Also, A

By laying an E1 link L between the N device 20a and the LE device 10 and interconnecting the V5 interface, the connection between the LE device 10 and the AN devices 20a to 20n can be established. Communication takes place. In addition, analog telephones, digital terminals (including digital telephones), PAB X, etc. are connected to AN devices 20a to 20n. I do.

In the following description, LE 10 → AN device 20 a-AN device 20 b → ...-The communication information flowing to AN device 20 n is referred to as downlink communication information D s, and AN device 20 n →--AN The communication information flowing from the device 20 b to the AN device 20 a → LE 10 is called uplink communication information U s. Further, the downlink communication information Ds and the uplink communication information Us are communication information based on the LAPV5 communication protocol.

With respect to the AN device 20a, the identification number holding means 21 holds an identification number for identifying itself. The identification number is, for example, a different number given to each of the AN devices 20a to 20n.In the figure, the identification number of the AN device 20a is # 1, and the identification of the AN device 20b is # 1. The number is # 2 …….

The identification number determining means 22 extracts an identification number from the downlink communication information Ds and determines whether or not the identification number matches its own identification number. When the identification number is determined to be identical by the identification number determining means 22, the downstream communication information acquiring means 23 recognizes the downstream communication information Ds addressed to itself, and Capture and process.

When the identification number discrimination unit 22 determines that the identification numbers do not match, the communication information relay unit 24 relays the downlink communication information Ds to another AN device (subordinate AN device).

For example, in the figure, since the downlink communication information Ds including the identification number # 2 is transmitted, it does not match the identification number # 1 of the AN device 20a. Therefore, the downstream communication information Ds is relayed to the subordinate AN device (here, AN device 20b).

On the other hand, when receiving the uplink communication information U s from another AN device, the communication information relay unit 24 relays the uplink communication information U s toward LE 10. For example, when the uplink communication information Us transmitted from the AN device 20b is received, In this case, the communication information relay means 24 relays the uplink communication information Us toward LE 10.

Note that each of the components described above is also included in the AN devices 20b to 20n. However, since the AN device 2 On is located at the end in AN 200, it is not necessary to have a function of relaying the uplink communication information Us.

For LE 10, the downstream communication information transmitting means 11 1 inserts the identification number of the AN device with which communication is desired, generates and transmits downstream communication information Ds, and in the figure, the AN device 20 b The communication information Ds is generated and transmitted by inserting the identification number # 2 in order to communicate with the server.

The upstream communication information receiving means 12 receives the upstream communication information Us sent from any of the AN devices 20a to 20n, extracts an identification number, and performs processing corresponding to each AN device. Do.

The communication channel management means 13 performs management control so that a plurality of AN devices 20a to 20n share the same time slot with respect to the time slot in the communication channel. That is, in the present invention, since it is necessary to control a communication channel using the same link, control is performed so that a plurality of AN devices can share the same communication time slot at different times.

For example, the time slot TS1 in the communication channel is used when the LE 10 and the AN device 20a perform call control, and then used when the LE 10 and the AN device 20b perform call control. Management so that it can be done.

As described above, the interconnection communication system 1 of the present invention assigns identification numbers to a plurality of AN devices 20a to 2On, and takes in the case of downlink communication information Ds having its own identification number. In the case of downlink communication information D s which does not have its own identification number, it is relayed to another AN device, and in the case of uplink communication information U s, it is relayed toward LE 10. In a conventional V5 interface communication system, LE and AN devices were connected in a 1: 1 ratio. That is, the LE has determined the AN device to communicate with for each link corresponding to each AN device, and each AN device has a V5 interface. Therefore, the introduction of new AN equipment required the addition of a new E1 link to increase the number of V5 interfaces.

On the other hand, in the present invention, the identification number that is the destination of the AN device is added to the format of the communication information exchanged between the LE and the AN device, so that both the LE and the AN device perform communication while being aware of the communication partner. Can be.

For this reason, it is not necessary to have a V5 interface for each AN device, and a single V5 interface can accommodate multiple AN devices and perform 1: n (one LE: n AN devices) communication. It can be carried out.

Therefore, even when a new AN device is introduced, it is only necessary to newly add an identification number, and physical construction of the E1 link is not required.

Next, the format configuration of the downlink communication information Ds will be described. FIG. 2 is a diagram showing a format configuration of the downlink communication information Ds. The format of one frame of the downlink communication information Ds is composed of 〇ctet 1 to N.

Octetl and OctetN are FLAG (01111110), Octet1 does not have a frame start flag, and 〇ctetN does not have a frame end flag. Octet 2 Envelope Function Address (EFA) is an address field into which the identification number of the present invention is inserted.

The Octets 3 and 4 EFA are address fields into which identification information for identifying the LAPV5 communication protocol and the like is inserted (described later). 〇 ctet 5 to N—3 is Information, and is an information field indicating the contents of the protocol specified by the EFA of Octet 3 and 4. You.

The FCS (Frame Check Sequency) of O ctet N-2 and N ctet N_l is a frame and check sequence, and is a CRC for detecting whether a transmission error has occurred from Octet 2 to Octet N-3. (Cyclic redundancy check code). Since the uplink communication information U s has the same configuration, the description is omitted. FIG. 3 is a diagram showing a detailed format of EFA. In bit 8 to bit 2 of the EFA of Octet2, the identification number of the AN device is inserted. The EA of bit 1 of 〇 ctet 2 to Octet 4 is continuous when EA = 0 (indicating that 〇 ctet continues), and ends when EA = 1 (hereinafter (ctet is This is a bit that indicates that it does not continue.)

数値 A numerical value expressed as 13 bits, combining the EFA (higher) of bits 8 to 3 of ctet 3 and the EFA (lower) of bits 8 to 2 of Octet 4 Indicates a unique ISDN user part within the V5 interface if the represents a range of 0 to 8175. Bit 2 of EFA of の ctet 3 is fixed to 0.

On the other hand, when 〇ctet3 and 〇ctet4 indicate the LAPV5 communication protocol, 5-8 (higher) of 063 is 111111.

Then, when the EFA (lower) of Octet 4a is 1110000 with respect to the EFA (lower) of Octet 4, PSTN (Public Switched Telephone Network) is defined as the LAPV5 communication protocol. That is, if the numerical value represented by the 13 bits of the EFA (higher) of Octet 3 and the EFA (lower) of Octet 4 is 8176, it is PSTN. PS TN is a protocol that controls the call of analog telephones. If Octet 4b has an EFA (lower) of 1110001, Control is defined as the LAPV5 communication protocol. That is, if the numerical value represented by 13 bits of 50613, 5-8 (higher) and Octet 4 EFA (lower) is 8177, then Contro1. Control is a protocol that performs overall control related to the V5 interface.

If E F A (lower) of O c t e t 4 c is 1110010, L A

BCC (Bearer Channel Connection) power is defined as a PV 5 communication protocol. In other words, if the numerical value represented by 13 bits of 〇 (: 1: 6 1; £? 8 (higher) of 3 and 〇c tet 4 EFA (lower) is 8 1 7 8

B C C BCC is a protocol that controls the communication channel between the LE and AN devices.

If E F A (lower) of O c t e t 4 d is 1110011, L A

Pr (Protection) is defined as a PV 5 communication protocol. That is, if the numerical value represented by 13 bits of EFA (higher) of 〇ctet3 and EFA (lower) of Octet4 is 8179, it is Pr. P r is a switching control protocol for switching to a standby system when a failure occurs in the link between the LE and AN devices.

If the lower of (61) and (46) is 1110100, Link_C (C: Control) is defined as the LAPV5 communication protocol. In other words, if the numerical value represented by 13 bits of EFA (higher) of 〇ctet3 and EFA (lower) of Octet4 is 8180, then Link

Becomes C. Link-C is a protocol that controls the link between the LE device and the AN device.

Next, the protocol architecture of the LAP V5 communication protocol of the present invention will be described. Figure 4 shows the protocol architecture. You.

The figure shows the layer 1 to layer 3 protocol architecture of LE 10 and AN devices 20a to 2On. Layer 10 of LE10 and AN device 20a ~ 20η, physical layer 'V5 interface interconnect function 10-1 and 20a- :! ~ 20 η_1 are located respectively, and provide the physical and electrical interface of the V5 interface.

L Ε 10 and AN device 20 a ~ 2 On Layer 2 include data link layer · V5 interface interconnect function 10-2 and 20 a-2 ~ 20 η-2 The interconnection control of the present invention, such as the identification number identification of the AN device as described with reference to FIG. 1, is performed in this portion. Further, the communication protocol of LAP V5 described above with reference to FIG. 3 is located in Layer 3 of L E 10 and AN devices 20a to 2On, respectively.

Here, the arrows in the figure show the flow of data and control when instructing PSTN communication control from LE 10 to AN device 20 n. Here, for example, in the data link layer of the AN device 20a, the V5 interface interconnect function 2Oa-2 determines the identification number in the downlink communication information Ds received from the LE10, It recognizes that it is not addressed to itself and relays it to the subordinate AN device (processing stops at Layer 2).

In addition, the data link layer of the AN device 20 η and the V5 interface interconnect function 2 η _ 2 determine the identification number in the downlink communication information Ds that is relayed and sent. Then, it recognizes that it is addressed to itself and passes the downlink communication information Ds to layer 3 for processing.

Next, problems that occur when the AN devices 20a to 20n are connected in a ring will be described. Fig. 5 shows a case where AN devices are connected in a ring.

AN device 20a to 20d are connected in a ring, and AN device 20a and LE 10 is connected. Then, the downstream communication information Ds flows in the order of AN device 20a → AN device 20b → AN device 20c → AN device 20d, and the upstream communication information Us flows from AN device 20d → AN device 2 0 c — Flow from AN device 20 b → AN device 20 a. The solid arrow in the figure is the downlink communication information Ds, and the dotted arrow is the uplink communication information Us.

FIG. 6 is a diagram showing the flow of communication information when a failure occurs. It is assumed that a failure has occurred between the AN device 20a and the AN device 20b. As a flow of communication information of the conventional ring configuration when a failure occurs, downlink communication information Ds flows from AN device 20 a → AN device 20 d → AN device 20 c → AN device 20 b, Uplink communication information Us flows from AN device 20b to AN device 20c to AN device 20d to AN device 20a.

In such a case, the AN device 20d when the failure does not occur in the figure is the end node of the system (having the identification number # 4 as the last number), so the relay function is not required. However, if a failure occurs between AN device 20a and AN device 20b as shown in Fig. 6, AN device 2Ob becomes the end node of the system, and AN device 20d has a relay function. There is a need.

As described above, when a failure occurs between the AN devices having the ring configuration, the order of the identification numbers is lost, and there is a possibility that communication control may be inconvenient (for example, a service interruption). Therefore, in order to apply the V5 interface interconnection control of the present invention as described with reference to FIG. 1 to AN devices having a ring configuration, control is performed so that the order of identification numbers is not disrupted even when a failure occurs. There is a need to. When AN devices are connected linearly, the order of the identification numbers does not change even if a failure occurs between AN devices.

Next, the path setting means of the present invention will be described. When a failure occurs between the AN devices connected in a ring, the path setting means determines the order of the identification numbers. The path of the detour route is set so as not to collapse. The path setting means is located in the AN device.

FIG. 7 is a diagram showing a flow of communication information in a normal state. AN devices 20a to 20d are connected in a ring shape, and AN device 20a is connected to LE10. The lines indicated by thick solid pipes are the P (Primary) line and the S (Secondary) line of the SDH interface.

The P line is a line that takes in communication information in preference to the S line. In the figure, the left line of the AN device 20b to 20d is the P line, and the right line is the S line. In addition, in the AN device 20a, the transmission side of the downlink communication information Ds fetched from the LE 10 is the P line.

Therefore, the flow of the downstream communication information Ds is AN device 20a → AN device 20b → AN device 20c → AN device 20d, and the identification number is # 1 → # 2 → # 3 → # 4 (In order to simplify the description, the description of the uplink communication information U s is omitted).

The P line has a primary path corresponding to the active system and a secondary path corresponding to the standby system. Similarly, the S line has a primary bus corresponding to the active system and a secondary path corresponding to the standby system. In the figure, the solid line is shown as the primary path, and the dotted line is shown as the secondary path.

On the other hand, in the normal state, the primary path of the P line and the primary path of the S line are selected, and the V5 interface in the AN device 20a to 20d interconnection function 20a—2 to 20d_2 Communication is performed. In addition, the secondary path of the P line and the S line should be through connection.

FIG. 8 is a diagram illustrating path setting when a failure occurs. It is assumed that a failure has occurred between AN device 20a and AN device 20b. In this case, the AN device 20a releases the through connection of the secondary line of the P line and the S line, and connects the secondary path of the S line to the V5 interface interconnection function 20a-2. To switch from the P line primary path to the S line secondary path.

Similarly, in the AN device 20b, the through connection of the secondary path of the P line and the S line is released, and the secondary path of the S line is connected to the V5 interface interconnection function 20b-2. Switch from the primary path on the P line to the secondary path on the S line.

In other words, AN device 20a and AN device 20b are connected via path P1 as shown in the figure (V5 interface interconnection function 20a — 2 and V5 interface interconnection Function 2 0 b—connects 2). Therefore, in the AN device 20a before the failure occurred, the downstream communication information Ds received from LE 10 was sent on the primary path of the P line, but after the failure occurred, it was sent on the secondary path of the S line. Become.

In the AN device 20b before the failure, the downlink communication information Ds sent from the AN device 20a was received on the primary path of the P line, but after the failure, it was received on the secondary path of the S line. Will do.

Thereafter, the AN device 20c receives the downlink communication information D s from the AN device 20b on the primary path of the P line, and the AN device 20d receives the downlink communication information from the AN device 20c on the primary path of the P line. D s is received.

Therefore, the flow of the downstream communication information Ds is AN device 20a → AN device 20b → AN device 20c → AN device 20d, and the identification number is # 1 → # 2 → # 3 → # 4 Therefore, the interconnection control of the V5 interface can be performed without breaking the order of the identification numbers.

FIG. 9 is a diagram illustrating path setting when a failure occurs. It is assumed that a failure has occurred between the AN device 20b and the AN device 20c. In this case, the AN device 2 O b releases the through connection of the P-line and S-line secondary paths, and connects the P-line secondary path to the V5 interface interconnection function 20 b-2 To switch from the S path primary path to the P line secondary path.

In the AN device 20c, the through connection of the secondary path of the P line and the S line is released, and the secondary path of the S line is connected to the V5 interface interconnect function 20c-2. Switch from P-line primary path to S-line secondary path.

That is, the AN device 20b and the AN device 20c are connected by the path P2 as shown in the figure (V5 interface interconnection function 20b-2 and V5 interface interconnection function 2 0 c—connect 2). Therefore, in the AN device 20b before the failure occurred, the downstream communication information Ds received from the AN device 20a via the P-line primary path was passed through the S-line primary path, but after the failure, the P-line It will flow from the secondary path.

Before the failure occurred, the AN device 20c received the downlink communication information DS sent from the AN device 2Ob on the primary path of the P line, but after the failure occurred, received the downlink communication information DS on the secondary path of the S line. Will be.

Thereafter, the AN device 20d receives the downlink communication information Ds from the AN device 20c on the primary path of the P line.

Next, the interconnection communication method of the present invention will be described. FIG. 10 is a diagram showing a processing procedure of the interconnection communication method.

[S1] The identification number of the AN device to be communicated is inserted on the LE side to generate and transmit downlink communication information Ds. [S2] The AN device extracts the identification number from the downlink communication information Ds, and determines whether or not it matches its own identification number. If they match, go to step S3. If they do not match, go to step S4.

[S3] The downstream communication information Ds is fetched and processed.

[S4] The downlink communication information Ds is relayed to another AN device. Also, when the uplink communication information U s is received from another AN device, the uplink communication information U s is relayed to the LE.

In addition, for the time slot in the communication channel, management control is performed so that multiple AN devices share the same time slot.

Furthermore, when the AN devices are connected in a ring and a failure occurs between the AN devices, a path is set so that the order of the identification numbers does not change.

As described above, the interconnection communication system of the present invention holds an identification number for each of a plurality of access network devices, takes in the case of downlink communication information having its own identification number, processes it, and In the case of downlink communication information that does not have an identification number, it is configured to relay to other devices. This makes it possible to efficiently accommodate a plurality of access network devices in one V5 interface and perform high-quality communication.

Also, the interconnect communication method of the present invention holds an identification number for each of a plurality of access network devices, takes in the case of downlink communication information having its own identification number, processes the downlink communication information, and processes its own identification number. In the case of downlink communication information that it does not have, it is relayed to other devices. This makes it possible to efficiently accommodate a plurality of access network devices in one V5 interface and perform high-quality communication.

The above merely illustrates the principles of the invention. In addition, many modifications and changes are possible for those skilled in the art, and the present invention is not limited to the exact configuration and application illustrated and described above, but Modifications and equivalents of the above are considered to be within the scope of the present invention by the appended claims and their equivalents.

Claims

The scope of the claims

1. In an interconnected communication system that communicates by interconnecting with V5 interface,

Identification number holding means for holding an identification number for identifying itself, identification number determination means for extracting the identification number from downlink communication information and determining whether or not the identification number matches the identification number; Means for acquiring and processing the downlink communication information and relaying the downlink communication information to another device when there is a mismatch, or when the uplink communication information is received from the other device, Communication information relay means for relaying a plurality of access network devices comprising:

A downlink communication information transmitting means for generating and transmitting the downlink communication information by inserting an identification number of an access network device to be communicated with, and receiving the uplink communication information from the access network device, An exchange that extracts a number and performs processing corresponding to each of the access network devices, and an exchange that is interconnected with the access network device through one V5 interface.

An interconnected communication system comprising:

2. The exchange further includes a communication channel management unit that performs management control for a plurality of access network devices to share the same time slot with respect to a time slot in the communication channel. The interconnect communication system of claim 1.

3. In the case where the access network devices are connected in a ring and a failure occurs between the access network devices, there is further provided a path setting means for setting a path such that the order of the identification numbers is not disrupted. 2. The interconnected communication system according to claim 1, wherein:

4. In an access network device that communicates by interconnecting with V5 interface,

Identification number holding means for holding an identification number for identifying itself, identification number determination means for extracting the identification number from downlink communication information, and determining whether or not the identification number matches the own identification number;

In the case of a match, the downlink communication information acquiring means for capturing the downlink communication information, and in the case of a mismatch, the downlink communication information is relayed to another device, or when the uplink communication information is received from the other device, the uplink communication information is acquired. Communication information relay means for relaying

An access network device comprising:

5. In a switch which performs communication by interconnecting with a V5 interface, a downstream communication information transmitting means for generating and transmitting downstream communication information by inserting an identification number of an access network device to be communicated with; ,

Uplink communication information receiving means for receiving uplink communication information from the access network device, extracting the identification number, and performing a process corresponding to each of the access network devices;

An exchange comprising:

6. In the interconnect communication method of interconnecting and communicating with V5 interface,

The switchboard inserts the identification number of the access network device to communicate with, generates and transmits downlink communication information, and

On the access network device side, extract the identification number from the downlink communication information, and determine whether or not the identification number matches its own identification number;

In the case of a match, the downstream communication information is captured and processed,

If not, relay the downlink communication information to another device,

When uplink communication information is received from the other device, the uplink communication information An interconnection communication method, wherein the interconnection and the access network device are interconnected by relaying to the exchange.

7. The interconnection communication method according to claim 6, wherein a plurality of the access network devices perform management control for sharing a same time slot with respect to a time slot in a communication channel.

8. When the access network devices are connected in a ring and a failure occurs between the access network devices, a path is set so that the order of the identification numbers is not disrupted. An interconnect communication method according to item 6.