JPH02195751A - Multi-address communication using ring - Google Patents

Abstract

PURPOSE:To prevent throughput from being lowered and to perform multi- address communication in a communication network as suppressing transfer delay time by providing a ring module to be connected to plural terminals at communication nodes which perform transfer in one to one mutually. CONSTITUTION:In a wide area communication network such as a nationalwide network, etc., first communication nodes 111-114 and a second communication node 120 which perform the transfer in one to mutually are ester-connected, etc., the ring modules 141-145 which perform one-pair plural connection for each terminal equipment are provided at the nodes 111-114 and 120. For example, a communication signal from terminal equipment 101 is sent to the node 111, and is sent by the one-pair plural connection to terminal equipment 102 and 103, and a transmission line 131 by the module 141. Next, an input communication signal from each of transmission line 132 and 134 is one-pair plural connected to terminal equipment 104, 108, and 109 via the modules 142 and 144 at the nodes 112 and 114, and the multi-address communication of a transmission signal from the equipment 101 to the equipment 102-104, 108 and 109 are performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The Broadband Advanced Services Digital Network (BISDN) has the ability to connect multimedia such as voice, images, and data to traditional one-to-one connections and is a positive integer) connection. If a communication network could provide an L-to-N connection fee, it would be possible to send and receive information between multiple locations, such as in a video conference, to send the same document to multiple parties, or to broadcast broadcasts, such as receiving cable broadcasts. Users can freely receive services. It would be even more convenient if such services were available nationwide, rather than being limited to a particular region.

Generally, as shown in FIG. 7, a nationwide wide area communication network consists of first communication nodes 70s to 704 accommodating terminal devices 71 to 7I, and first communication nodes 701 to 704t.
- A star network is used, which consists of a second communication node 71 to accommodate. Such a star network is a communication network suitable for interconnecting a large number of terminal devices that cannot be accommodated by the first communication node alone.

Note that in an actual wide area communication network, the number of stages of communication nodes can be increased arbitrarily, and even though it is based on a star network, the (also served as the (n+1)th communication node),
Alternatively, a composite network may be used in which the (n+1)th communication nodes are connected in the form of a mesh (n is an arbitrary royal integer). FIG. 8 shows an example of a composite network based on a three-stage star network. 81-89 are terminals, 801-804
are the first communication nodes, 81s and 81m are the second communication nodes, and 83s to 83g are the third communication nodes.

The present invention relates to a broadcast communication system that provides broadcast communication services in real time in addition to conventional one-to-one communication services in such wide area communication networks.

[Conventional technology]

As conventional broadcast communication systems, there are two techniques shown below.

First Prior Art: FIG. 9 is an example of a broadcast communication system using a copy network, which is the first prior art.

In this prior art, each communication node performs one-to-many connections using the B network, and data is transferred one-to-one between the communication nodes. FIG. 9 shows an example of the configuration of each communication node, in which communication information is packetized and connected. Hereinafter, the operation of one-to-multiple connections will be explained using FIG. 9.

A communication signal from a subscriber line or trunk line 91 is input to a first packet processing module (PPI), the required number of copies is written in header information, and the signal is sent to a copy network 92. Next, in the copy network n, the communication signal is copied by the number specified by the header information and sent to the routing control circuit (RP). Next, the routing control circuit (R
Routing information to the target output terminal is written into the header information and sent to the distributed network 93. In the distributed network 93, a plurality of packets are transferred to each other via the routing network 9, which will be described later.
The packets are distributed and sent to each input terminal of the routing network 94 to avoid collision within the routing network 94. In the routing network 94, the packet is routed to the target output terminal based on the header information, and then sent to the second packet processing module (
PP2). The second packet processing module (
In PP2), header information necessary for the next communication node or receiving terminal device is written and sent to the subscriber line or trunk line 91.

Second Prior Art: FIG. 10 is an example of a broadcast communication system using a ring system, which is the second prior art. The ring system is a system suitable for broadcast communication, and is a technology that can provide broadcast connections while suppressing a decrease in throughput and an increase in transfer delay time compared to the first conventional technology.

All communication nodes 1 accommodating terminal devices 101 to 108
11 to 114 are connected in a ring shape. Each communication node 111 to 114 pulls in the communication signal to which header information representing broadcast communication is added and travels around the ring transmission path, and transmits the communication signal to the terminal device within the own communication node based on the header information. Determine whether the signal is a broadcast signal or not, and if it is a broadcast signal to the own communication node, copy the communication signal and send it to the terminal device and the ring transmission path, and broadcast to the own communication node. If the communication signal is not a signal, the communication signal is directly sent to the ring transmission path.

[Problem to be solved by the invention]

In the first conventional technology, the communication signals multiplied by the copy network rapidly increase the traffic volume of the subsequent distribution network and routing network, and the transfer capacity (throughput) of the switch network rapidly decreases due to congestion within the switch network. It will drop to . Special feature: When ordinary one-to-one connections are also implemented using the same switch network, the impact on one-to-one connection communications is enormous.

Furthermore, since the communication signal must pass through a total of three switch networks, including a copy network, a distribution network, and a routing network, there is a problem in that the transfer delay time increases.

In the second prior art, K, which constitutes a large-scale wide-area communication network on a nationwide scale, requires a very long ring transmission path, and the propagation delay time of the ring transmission path reduces the communication signal. Transfer delay time increases, and the transfer capacity (throughput) of the ring system decreases significantly. Therefore, realistically, the limit is to cover an area with a radius of about 20 km. We also have one ring system,
The number of communication nodes that can be accommodated is limited by the length of the address, and is about 100 at most.

The present invention solves these drawbacks, avoids an increase in traffic to the switch network through broadcast communication, prevents a decrease in throughput, and suppresses transfer delay time while being applicable to a wide area communication network such as a nationwide network. The purpose is to provide a possible broadcast communication method.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a first communication node that accommodates a terminal device, a second communication node that accommodates the first communication node, and a second communication node that accommodates the first communication node.
The terminal accommodated in the first communication node of a wide area communication network constituted by the (n+1)th (n is any positive integer) communication node accommodating communication nodes, hereinafter n communication nodes depending on the origin. In a broadcast communication method in which broadcast communication is performed from an arbitrary terminal device of a device to other arbitrary and plural terminal devices, each of the first to nth communication nodes has a one-to-multiple communication with the terminal device. It is characterized by comprising a ring module for making connections.

Each of the first to nth communication nodes includes a call processing module to which a subscriber line or a trunk line is connected and which performs call control, and a call processing module to which each of the call processing modules is connected to a ring access unit. An embodiment including ring modules that are connected to each other in a ring shape and perform one-to-many connections is effective.

Further, each of the first to nth communication nodes includes a call processing module to which a subscriber line or a trunk line is connected and performs call control, and a plurality of the call processing modules are connected to each other and are connected to one another.
Another device comprising: an interconnection module that performs a one-to-one connection; and a ring module in which each of the call processing modules is connected to a ring access unit, and the ring access units are connected to each other in a ring to perform a one-to-multiple connection. Aspects are also effective.

Further, each of the first to n-th communication nodes includes a call processing module to which a subscriber St or a trunk line is connected and which performs call control, each of the call processing modules and each of the relay processing modules described later is connected to a ring. The ring access units are connected to each other in a ring shape.
A plurality of ring modules that perform pair-to-multiple connections, a plurality of relay processing modules that are connected between the ring module and the interconnection module described later, and a plurality of the relay processing modules that are connected to each other and have a one-to-one connection. An embodiment comprising an interconnection module for making the connections is also advantageous.

Further, each of the first to nth communication nodes Kt has a call processing module to which a subscriber line or a trunk line is connected and performs call control, and a plurality of the call processing modules are connected and have a mutual l1c 1-to-1 connection. a plurality of ring modules in which each of the call processing modules is connected to a ring access unit and the ring access units are connected to each other in a ring shape to perform one-to-many connections;
An embodiment comprising a plurality of relay processing modules connected between each of the ring modules and the interconnect module is also effective.

Further, each of the first to nth communication nodes includes a call processing module to which a subscriber line or a trunk line is connected and performs call control, and a plurality of the call processing modules are connected to each other and are connected to one another.
An interconnection module that performs pair-to-one connection, each of a plurality of interface lines from the interconnection module is connected to a ring access unit, and the ring access units are connected to each other in a ring shape to receive signals input from the interconnection module. It is also effective to include a ring module that outputs broadcasts to a plurality of the interface lines according to the number of broadcasts to be broadcast.

[Operation] In the present invention, a first communication node that accommodates a terminal device, a second communication node that accommodates the first communication node, and a (n+1)th communication node that similarly accommodates an n-th communication node. In broadcast communication from any terminal device to any plurality of terminal devices in a wide area communication network (where n is any positive integer), each of the first to nth communication nodes includes a ring module and uses the ring module to perform a one-to-one connection, and the main feature is that one-to-one transmission is performed between each communication node. Therefore, the present invention is suitable for use on a nationwide scale. In a composite network based on a star network suitable for a wide area communication network, each communication node of the communication network performs one-to-multiple connections using ring modules that do not reduce throughput or increase transfer delay time. Data is transferred one-to-one between communication nodes.

Therefore, it is possible to provide a broadcast communication system that avoids a decrease in throughput and an increase in transfer delay time and is applicable to a wide area communication network such as a nationwide network. Examples will be described below based on the drawings.

〔Example〕

FIG. 1 shows an embodiment of the invention. In this example, for simplicity, a two-stage star network is shown in which the communication network is composed of a first communication node accommodating a terminal device and a second communication node accommodating the first communication node. It is. Note that it is also possible to set the number of stages of communication nodes to any positive integer, and even though the star network is used as a basis, the n-th communication node has the (n+1 ) or a complex network in which the (n+1)th communication nodes are connected in a mesh-like manner (n is any positive integer).

101 to 109 are terminal devices, 111 to 114 are first communication nodes that accommodate the terminal devices, 120 are second communication nodes that accommodate the first communication nodes, 131 to 134 are transmission paths, and 141 to 145 are rings. It is a module.

From the terminal device 101 to the terminal device 102.103.104.
The present invention will be explained in detail using an example of broadcast connection to 108° and 109.

First, a communication signal from the terminal device 101 is transmitted to the communication node 1
11, and one-to-many connections are made to the terminal devices 102 and 103 and the transmission line 131 in the ring module 141. Next, in the second communication node 120, the communication signal input from the transmission path 131 is transmitted to the ring module 1.
One-to-many connections are made at 45 to transmission lines 132 and 134. Next, the first communication nodes 112 and 1
At 14, communication signals inputted from transmission lines 132 and 134 are connected in a one-to-many manner to terminal devices 104, 108 and 109 in ring modules 142 and 144, respectively. In this way, the communication signal from the terminal device 101 is sent to the terminal device 102, 103.104.10.
Broadcast connection is made to 8.109.

FIG. 2 shows the first method of configuring a communication node according to the present invention.
This is an example.

The communication node is composed of a call processing module to which a subscriber line or a trunk line is connected, and a ring module in which a ring access unit is connected to the call processing module, and the core ring access units are connected in a ring shape. has been done.

The broadcast signal from the subscriber line or trunk line enters the call processing module (CPMI), and the call processing 317 joules (CPM
An example is shown in which one-to-multiple connections are made to 2) and (CPM4).

A broadcast control signal is added to a broadcast signal from a subscriber line or a trunk line by a call processing module (CPMI), and the signal is sent to a ring transmission path via a ring access unit (RAUI). On the ring transmission path - ring access units (RAU2), (RAU3).

The broadcast signals are circulated as (RAU4) and (RAUI).

Each ring access unit (RAU) determines whether to receive the broadcast signal based on the broadcast control signal among the broadcast signals that have been circulated. In this example, the lingua broadcast signal reception mechanism can be divided into a call control phase and a data transfer phase as shown in the first order.

First, in the call control phase, the call processing module (CPM
I) by @M* VCNat X, Y* R'
A broadcast control signal is added and the signal is sent to the ring transmission path via the ring access unit (RAUI). @M'' in the broadcast control signal is a multicast bit and indicates that it should be received by all ring access units (RAUs).
AU2), (RAU3), (RAU4)
receives the broadcast control signal. In addition, "X" and @Y# are ring access units (RAU's) that should receive broadcast signals.
) is displayed, "VCNa-" means the logical channel number used in the data transfer phase, and "R" is the ring access unit (RAUL) when the broadcast signal returns to it. It is displayed to be deleted.

Ring Access Unit (RAU2) and (RAU
4), the broadcast control signals @XIT and @
Y # indicates that a broadcast signal should be received, “
VCNa'' is a signal to be received in the data transfer phase and is written in the logical channel number management table.

Also, the Ring Access Unit (RAUI) uses the broadcast control signal "R" to know that the signal it sent has made one circuit around the ring and returned, and deletes the broadcast signal because it is unnecessary. do.

Next, in the data transfer phase, the ring access unit (RAUI) transmits the broadcast signal to VCNa.

A control signal called R' is added and transferred onto the ring,
Ring access unit (RAU2), (RAU3)
.

It is circulated as (RAU4) and (RAUI). The ring access units (RAU2) and (RAU4) know from the control signal "VCNa" that it is a signal to be received, and each call processing module (CPM2) (
The broadcast signal is transferred to CPM4). Also, the broadcast signal is canceled by the ring access unit (RAUI) using the control signal "R". Note that ``R'' may display the own address of the ring access unit (RAUI).

In this way, it is possible to broadcast the signal to the target call processing module.

Note that in cases where the terminal equipment that receives the broadcast signal is fixed for a relatively long period of time, such as in cable television (CATV), it is possible to omit the above-mentioned call control 7 aids. It is also possible to perform a broadcast connection only in the data transfer phase using logical channel numbers (VCNr).

Furthermore, it is also possible to perform one-to-one connection using the ring module of the present invention.

FIG. 3 shows a second embodiment of the communication node configuration method according to the present invention.

301-304 are subscriber #s or trunk lines, 311-31
4 is a call processing module (CPM), 320 is a ring module, and 330 is an interconnection module.

Signals input from subscriber lines or trunk lines 301 to 304 are identified by call processing modules 311 to 314 as being broadcast signals or one-to-one communication signals, and if they are broadcast signals, they are treated as broadcast control signals. is added to ring module 3
20, if it is a one-to-one communication signal, a connection control signal is added and transmitted to the module 330 on the interconnection. The interconnect module transfers the signal to the destination call processing module. On the other hand, the broadcast signal is circulated in the ring module.

If the signal is addressed to itself, it is received and the broadcast signal is transferred to each connected call processing module (CPM). The operation of the ring module is similar to that in FIG.

FIG. 4 is a third diagram related to the communication node configuration method in the present invention.
This is an example.

The difference from Figure 2 is that there are multiple ring modules,
Another point is that there are a plurality of relay processing modules (TPM) and interconnection modules (PPM) to perform broadcast connections across a plurality of ring modules.

A call processing module (CPMI) to a call processing module (CPM2) in a first ring module (RMI).

An example of broadcasting to the call processing modules (CPM5) and (CPM6) in the second ring mall (RM2) will be explained.

The call processing module (CPMI) adds the broadcast control signal in the ring module (RMI) and sends the broadcast signal to the ring transmission path via the ring access unit (RAUI). On the ring transmission path, ring access units (RAU2), (RAU3)
.

The broadcast signals are circulated as (RAU4) and (RAUI).

Each ring access unit (RAU) determines whether to receive the broadcast signal based on the broadcast control signal among the broadcast signals that have been circulated. In this example, ring access units)
(RAU2) and (RAU3) receive the broadcast signal,
The broadcast signal is transferred to the call processing module (CPM2) and the first relay processing module (TPMI), respectively.

The relay processing module (TPMI) adds the connection control signal and broadcast communication information in the interconnection module (PPM) to the broadcast signal, and transfers the broadcast signal to the interconnection module (PPM). The interconnection module (PPM) transfers the broadcast signal to the second relay processing module (TPM2) based on the connection control signal. In the second relay processing module (TPM2) that received the broadcast signal,
A broadcast control signal in the ring module (RM2) is added to the broadcast communication information, and the broadcast signal is sent to the ring transmission path via the ring access unit (RAU7).

On the ring transmission path, the ring access unit) (RA
U8).

The broadcast signal is circulated as (RAU5), (RAU6), and (RAU7). Each ring access unit (R
The AU) determines whether or not to receive the broadcast signal based on the broadcast control signal among the broadcast signals that have been circulated. In this example, ring access units (RAU5) and (RAU6)
receives the broadcast signal and transfers the broadcast signal to the call processing modules (CPM5) and (CPM6). First, the ring access unit (RAU7) erases the broadcast signal.

In this way, from the call processing module (CPMI) to the call processing module (CPMI) in the ring module (RMI).
M2), call processing module (CPM5) in the ring module (RM2),
It is possible to broadcast to (CPM6).

In addition, the relay processing module (TPMI), (TPM2)
There are no restrictions on the connection relationship between the RAU″ and the ring access unit (RAU″), and any ring access unit (RAU″) can be
RAU) and a relay processing module (TPM).

Further, similar to FIG. 2, the mechanism for receiving broadcast signals within the ring module can be divided into a call control phase and a data transfer phase. Furthermore, it is also possible to perform a one-to-one connection using a ring module.

Figure 5 shows the original F! This is a fourth example regarding a communication node configuration method in AK.

The difference from FIG. 4 is that one-to-l connections and one-to-multiple connections are distributed by a call processing module (CPM) k and transferred to the interconnection module and ring module, respectively. The operation of one-to-one connection is the same as in Figure 3.
Pair-to-multiple connections are the same as in FIG.

In addition, in this way, book No. 1. Second. According to the third and fourth embodiments, it is possible to perform broadcast communication from any call processing module to any plurality of call processing modules without concentrating control on a specific device. Broadcast connection is also possible.

FIG. 6 is a fifth diagram related to the communication node configuration method according to the present invention.
This is an example.

From the call processing module (CPMI) (CPM3),
An example of broadcasting to (CPM4) will be explained.

A call processing module (CPMI) adds connection control signals and broadcast information within the interconnection module and transfers the broadcast signal to the interconnection module.

The interconnection module transfers the broadcast signal to the interface line (IFI) with the ring module according to the connection control signal. The ring module outputs the received broadcast signal to as many interface lines as the number of broadcast signals to be broadcast. still,
A connection control signal within the interconnection module is added to the broadcast signal output to each interface line. In the interconnect module, the destination call processing module (CPM)
Transfer the broadcast signal to.

Note that any number of interface lines (IFI to IF4) between the ring module and the interconnection module (!-) is possible.
You can use something similar to the figure. The difference lies in the method of adding the connection control signal described above.

〔Effect of the invention〕

As explained above, the present invention is applicable to a composite network based on a star network suitable for a nationwide wide area communication network.
Each communication node of the communication network performs one-to-many connections using a ring module that does not reduce throughput or increase transfer delay time, and data is transferred one-to-one between the communication nodes. Therefore, throughput reduction,
Furthermore, since an increase in transfer delay time is avoided and there is no limit to the number of communication nodes, it is possible to provide a broadcast communication system that can be applied to a wide area communication network such as a nationwide network. Further, if normal one-to-one communication is also performed using a ring module, the equipment can be shared between broadcast communication and one-to-one communication, and a small and economical communication node can be constructed.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of the present invention, and FIG. 2 is a first embodiment of the communication node configuration method according to the present invention.
Example. FIG. 3 is a second diagram related to the communication node configuration method according to the present invention.
FIG. 4 shows the third embodiment of the communication node configuration method in the present invention.
FIG. 5 shows a fourth embodiment of the communication node configuration method according to the present invention.
FIG. 6 shows a fifth embodiment of the communication node configuration method according to the present invention.
7 is a first configuration example of a wide area communication network, FIG. 8 is a second configuration example of a wide area communication network, and FIG. 9 is an example of a first conventional technology using a copy network. 10
The figure is an example of a second conventional technique using a ring system. 101-109...Terminal devices 111-114...First communication node 120...Second communication node 131-134...Transmission lines 141-145...Ring modules 301-304
...Subscriber lines or trunk lines 311-314...Call processing module 320...Ring module 330...Interconnection modules 71-79...Terminal devices 701-704...First communication node 71...2nd
Communication nodes 81-8@...terminal device SO, ~804...first communication node 811.81g
...Second communication nodes 831-83m...Third communication node 91...Subscriber m or trunk line 92...Copy network 93...Distribution network 94...Routing networks 101-108 ...Terminal devices 111 to 114...Communication node CPM...Call processing module RAU...Ring access unit IFI to IF4...Interface line TPM...Relay processing module Patent applicant Nippon Telegraph and Telephone Corporation Agent Patent Attorney Hisashi Tamamushi Gobe (5 members) CPM
: Time Processing Module Second Embodiment of the Communication Node Configuration Method in the Present Invention Figure 3. Interface line Fifth embodiment of communication node structure method according to the present invention FIG. 1st configuration example of wide area communication network Second configuration example of wide area communication network FIG. 8

Claims (6)

[Claims] (1) A first communication node that accommodates a terminal device, a second communication node that accommodates the first communication node, and the following in order:
from any terminal device of the terminal device accommodated in the first communication node of the wide area communication network consisting of the (n+1)th (n is any positive integer) communication node accommodating communication nodes of In a broadcast communication system that performs broadcast communication to arbitrary and plurality of terminal devices, each of the first to nth communication nodes includes a ring module that makes one-to-multiple connections to the terminal devices. A broadcast communication system using a ring that is characterized by: (2) A first communication node accommodating a terminal device, a second communication node accommodating the first communication node, and the following in order: n
from any terminal device of the terminal device accommodated in the first communication node of the wide area communication network consisting of the (n+1)th (n is any positive integer) communication node accommodating communication nodes of In a broadcast communication system that performs broadcast communication to arbitrary and plurality of terminal devices, each of the first to nth communication nodes has a call processing module connected to a subscriber line or a trunk line and performing call control. , a ring module in which each of the call processing modules is connected to a ring access unit, and the ring access units are connected to each other in a ring shape to perform one-to-multiple connection. Communication method. (3) A first communication node accommodating a terminal device, a second communication node accommodating the first communication node, and the following in order: n
from any terminal device of the terminal device accommodated in the first communication node of the wide area communication network consisting of the (n+1)th (n is any positive integer) communication node accommodating communication nodes of In a broadcast communication system that performs broadcast communication to arbitrary and plurality of terminal devices, each of the first to nth communication nodes includes a call processing module to which a subscriber line or a trunk line is connected and performs call control; A plurality of call processing modules are connected one to one with each other.
Each of the call processing modules is connected to a ring access unit, and the ring access units are connected to each other in a ring shape to make a one-to-multiple connection. A broadcast communication method using a ring. (4) A first communication node accommodating a terminal device, a second communication node accommodating the first communication node, and the following in order: n
from any terminal device of the terminal device accommodated in the first communication node of the wide area communication network consisting of the (n+1)th (n is any positive integer) communication node accommodating communication nodes of In a broadcast communication system that performs broadcast communication to arbitrary and plurality of terminal devices, each of the first to nth communication nodes includes a call processing module to which a subscriber line or a trunk line is connected and performs call control; Each of the call processing modules and each of the relay processing modules described below are connected to a ring access unit, and the ring access units are connected to each other in a ring shape to make a one-to-multiple connection; A ring is used, characterized in that it comprises a plurality of relay processing modules connected between it and a connection module, and an interconnection module to which the plurality of relay processing modules are connected and perform one-to-one connection with each other. Broadcast communication system. (5) A first communication node accommodating a terminal device, a second communication node accommodating the first communication node, and the following in order.
from any terminal device of the terminal device accommodated in the first communication node of the wide area communication network consisting of the (n+1)th (n is any positive integer) communication node accommodating communication nodes of In a broadcast communication system that performs broadcast communication to arbitrary and plurality of terminal devices, each of the first to nth communication nodes includes a call processing module to which a subscriber line or a trunk line is connected and performs call control; A plurality of call processing modules are connected one to one with each other.
a plurality of ring modules in which each of the call processing modules is connected to a ring access unit and the ring access units are connected to each other in a ring to make a one-to-many connection; each of the ring modules 1. A broadcast communication system using a ring, comprising a plurality of relay processing modules connected between the interconnection module and the interconnection module. (6) A first communication node accommodating a terminal device, a second communication node accommodating the first communication node, and the following in order.
from any terminal device of the terminal device accommodated in the first communication node of the wide area communication network consisting of the (n+1)th (n is any positive integer) communication node accommodating communication nodes of In a broadcast communication system that performs broadcast communication to arbitrary and plurality of terminal devices, each of the first to nth communication nodes includes a call processing module to which a subscriber line or a trunk line is connected and performs call control; A plurality of call processing modules are connected one to one with each other.
each of the plurality of interface lines from the interconnection module is connected to a ring access unit, the ring access units are connected to each other in a ring shape, and the signals input from the interconnection module are broadcast. 1. A broadcast communication system using a ring, comprising a ring module that outputs broadcast broadcasts to a plurality of the interface lines according to the number of connections.