JPS63237697A - Information communication system - Google Patents

Abstract

PURPOSE:To reduce the quantity of cables to be laid by directly connecting a time division multiplex communication line and a private line to a trunk exchange or a local exchange. CONSTITUTION:The transmission line to which subscriber's apparatus 1 following a local exchange 5 are connected is constituted into a tree-shaped time division multiplex transmission line 2, and a time division controller 3 is provided with a function, which converts the format of a signal transmitted in the common line signal system and that transmitted in the individual line individual channel system to each other, to directly connect the tree-shaped time division multiplex transmission line 2 to a trunk exchange 4 or the local exchange 5. Simultaneously, another time division controller 5 is connected to the time division controller 3 through a private line 6 and another treeshaped time division multiplex transmission line 2 is accommodated in the time division controller 3 to directly connect the private line 6 to the trunk exchange 4 or the local exchange 5. Thus, the quantity of cables to be laid is minimized and a flexible service is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a highly flexible information communication system suitable for public information communication such as telephone calls and data.

(Prior Art) A conventional information communication network (public network) connects a plurality of local exchanges (LS) to a transit switch (TS), and connects a plurality of remote line concentrators (RCS) under each of these local exchanges. Connected. A large number of subscriber devices (for example, telephones, data terminals, facsimile machines, etc.) are connected to this remote line concentrator. In addition, the above-mentioned relay exchange is connected to other relay exchanges in a mesh-like manner.
They are connected in tandem, loop, or star-like configurations via upper-level exchanges to construct, for example, a nationwide large-scale information communication network.

These relay exchanges and local exchanges mutually transmit signals using the common signal line method via the digital multiplex link described above.

Thus, when a subscriber device communicates information with another subscriber device connected to the same remote line concentrator, the line connection is made via the remote line concentrator.

In addition, when information is communicated with subscriber equipment connected to another remote concentrator, the subscriber equipment is transferred from the connected remote concentrator to the local exchange above it, and as necessary. Depending on the situation, a line connection is made via a higher-level relay exchange.

However, it is undeniable that establishing a new public information and communications network like this would require enormous amounts of time and expense. In particular, installing new communication cables (for example, twisted bare wires) between the remote concentrator and the subscriber equipment requires a large amount of expense. For this reason, most of the construction of new public information and communication networks is only planned for companies between major cities. In other words, the reality is that there are no prospects for the development of an inexpensive information and communication network for general subscribers.

On the other hand, in l5DN (Digital Integrated Network), which is one of the subscriber services that will be put into practical use in the near future, Twist Q
It is planned to implement two 84 Kbps information channels (B channels) and an 18 Kbps control/data channel (D channel) using wire pairs. However, since the above-mentioned channels are fixedly determined in this 15DN, there are problems such as, for example, normally, only two telephones can use the information communication network at the same time.

Therefore, 15DN has developed a (23B+D) optical fiber system for large companies in order to meet the demand for preparing a high-speed channel only when holding a video conference or transmitting a large amount of data in a short period of time. It is planned to prepare primary rate service and H channel service.

However, in order for a general subscriber to receive this service, it is necessary to install a new optical fiber cable between the local exchange 2 and the subscriber equipment 3. It was inappropriate as a service for people.

(Problems to be Solved by the Invention) In the information communication network, for which various studies have been carried out in the past, there remain many issues in dealing flexibly with installation costs and various service requests. has been done.

The present invention was made in consideration of these circumstances, and its purpose is to minimize the amount of cables that need to be laid and to provide flexible services to general subscribers. The purpose of the present invention is to provide an inexpensive information communication system that can connect a dedicated transmission line using a private line.

[Structure of the Invention (Means for Solving Problems)] The present invention provides a tree-like time division multiplex transmission path for the transmission path to which subscriber equipment below the local exchange is connected, and a tree-like time division multiplex transmission path. The transmission line is operated using the individual line individual channel system based on the TDMA system, and the format of the signal transmitted using the common line signal system and the signal transmitted using the individual line individual channel system is determined by the time division control device of this time division multiplex transmission line. By providing a function of mutually converting formats, the tree-shaped time division multiplex transmission path can be directly connected to a relay exchange or a local exchange.

At the same time, another time-division control device is connected to the above-mentioned time-division control device via a private line, and this time-division control device accommodates another tree-shaped time-division multiplex transmission path. The multiplex transmission line is operated in an individual line individual channel system using the TDMA system, and the private line is operated in an individual line common channel system, and the format of the signal transmitted to the time division control device in the common line signaling system is By providing a function to mutually convert signal formats transmitted using the individual line common channel system, the private line can be directly connected to a trunk exchange or a local exchange.

(Function) According to the present invention, since the transmission path to which subscriber equipment is connected is tree-shaped, the amount of cable installation can be significantly reduced compared to a conventional star-shaped network.
The installation cost can be reduced. Furthermore, since this tree-like network is used in the TDMA system based on the individual line signaling system, the time slots can be freely allocated according to service requests. Therefore, it becomes possible to flexibly deal with various service requests.

In addition, the time division control device that manages such a tree-shaped time division transmission path is 1. It has a function to mutually convert the signal format transmitted by the common line signaling system and the signal format transmitted by the individual line signaling system, so the above tree-shaped time division multiplex transmission line can be directly connected to the relay exchange. It becomes possible to connect.

Furthermore, since a private line can be connected via the time division multiplex control device, effects such as being able to adequately handle subscriber equipment groups with high communication demands can be achieved.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an information communication system according to the present invention. A feature of the network constructed by this system is that some or all of the subscriber equipment accommodating a plurality of subscriber equipment 1 is configured using a time division multiplex control device (TDMA).
) 3. This time division multiplex control device 3 is characterized in that it is constructed so that it can be directly connected to a relay exchange 4 or a local exchange 5.

Furthermore, another time division multiplex control device 3 is connected to the above time division multiplex control device 3 via a private line 8, and a tree-shaped time division transmission line 2 is connected to this time division multiplex control device 3 in the same way. A plurality of subscriber devices 1 are connected through the network.

Further, the subscriber equipment connected to the local exchange 5 shown in FIG. 1 may be an existing one, or a system consisting of the above-mentioned time division multiplex control device 3 may be used. At this time, the time division multiplex control device 3 is connected to the local exchange, but technically it is the same as when connected to the transit exchange 4.

Thus, the relay exchange 4 transmits signals with other relay exchanges via a digital multiplex link using a common line signaling system. Further, signal transmission via the tree-shaped time division multiplex transmission line 2 is performed using an individual line individual channel system such as a TDMA system. and the time division multiplex control device 3 via the private line 6.
Signal transmission between the two is carried out using an individual line common channel system.

Here, the common line signaling system in which signals are transmitted between the trunk exchanges 4 is a frame structure in which 23 voice channels B and one control channel D are time-divided as shown in FIG. 2(a), for example. be.

and gives information on the data transmission destination for the plurality of audio channels B of the frame on the control channel D,
A plurality of audio data to be transmitted to the transmission destination are time-divisionally allocated to each of the audio channels, and, for example, 544 Mb
Signals are transmitted all at once at a transmission speed of ps.

Note that in DMl and the like, it is also considered to transmit signals at a transmission rate of 2.048 Mbps with a frame structure of (30B+2D).

On the other hand, signals transmitted via the tree-shaped time division multiplex transmission line 2 using the individual line individual channel method are as shown in FIG.
As schematically shown in c), the audio channel B and the control channel D, which indicates information on the destination of the signal transmitted via the audio channel, are individually associated with each other for signal transmission.

Such a set of audio channel B and control channel D forms a pair and is transmitted through the time division multiplex transmission path 2 in a time division manner. In signal transmission using the individual line common channel method via the private line 6, as shown in FIG. 2(b), although the voice channel B is set individually, the control information assigned to each terminal is These control information are multiplexed, for example, in a time-division manner and are commonly provided via a common control channel D.

The time division multiplex control device 3 that manages the tree-shaped time division multiplex transmission line 2 controls signal transmission via the time division multiplex transmission line 2 as described below, and also controls the time division multiplex transmission line 2. It is configured to have a function of mutually converting the signal format transmitted by the individual line signaling system through the relay exchange 4 and the signal format transmitted by the common line signaling system between the relay exchanges 4. It also has a function of mutually converting between the signal format transmitted in the individual line common channel system between the time division multiplex control devices 3 via the private line B and the signal format transmitted in the common line signaling system between the relay exchanges 4. It is composed of:

This conversion function is a function that the conventional local exchange 5 has. This is achieved by combining signals of a plurality of audio channels B and adding information of a common control channel D to the signals. Conversely, data on the voice channel B addressed to the subscriber device 1 managed by itself is extracted from the signals received by the trunk exchange 4 using the common line signaling method, and the control channel D is used to designate the subscriber device 1. When adding the data individually or transmitting a signal to a specific time division multiplex control device 3 via the private line 8, this is realized by providing the transmission destination as the common control data D.

By being equipped with such a signal format conversion function, the time division multiplex control device 3 can not only communicate information between a plurality of subscriber devices 1 connected to the time division multiplex transmission line 2 that it manages, but also communicate with private lines. It is possible to communicate information with the subscriber equipment 1 housed in another time division control device 3 via the switch 6, and even with another system via the relay exchange 4. .

Now, the format of the signal that is time-divisionally communicated via the above-mentioned tree-shaped time-division multiplex transmission line 2 under the control of the time-division multiplex control device 3 by the above-mentioned individual line signaling system is as shown in FIG. 3, for example. This is realized by the TDMA method.

That is, the downlink signal format transmitted from the time division multiplexing control device 3 to the plurality of subscriber devices 1, and the downlink signal format transmitted from the plurality of subscriber devices 1 to the time division multiplexing control device 3
As shown in FIG. 3, the uplink signal format transmitted to the A control area for transmitting communication control information (ASG, RSP) to and from subscriber equipment 1. These B channel areas and D channel areas are each divided into a plurality of time slots, and the time slots are allocated to the subscriber equipment 1 upon receiving a time slot allocation request (call request, etc.) from the subscriber equipment 1. 1 respectively.

Note that the number of time slots is set to be smaller than the number of subscriber devices 1 connected to the transmission path 2, since it is extremely rare for all of the subscriber devices 1 to have communication requests at the same time. ing.

The time division multiplexing control device 3 transmits each time slot of the B channel area and the D channel area to a request from the subscriber equipment 1 or to the relay exchange 4.
In response to a request from a subscriber, the information is allocated independently to each subscriber device 1 that is directly involved in the information communication, depending on the communication specification.

The time slot allocation request from the subscriber equipment 1 and the time slot allocation by the time division multiplex control device 3 in response to this request are handled by the time slot allocation request from the subscriber equipment 1 using the control area set in one frame as described above. Response signal RSP
This is performed using the control signal ASG from the time division multiplex control device 3.

This time slot allocation control is performed, for example, as follows.

Now, when the subscriber equipment 1, e.g. a standard telephone, goes off-hook, the subscriber equipment 1 will receive, e.g. 4K
Requests slot allocation for the bps D channel. The time division multiplex control device 3 receives this slot allocation request,
The D channel time slot assignment setting is performed for the subscriber equipment 1 via the ASG.

To allocate the D channel time slot via this ASG, for example, the starting position of that time slot (the number of bits from the first bit of the frame, and the length of the slot if necessary) is sent by issuing the above slot allocation request. This is done by notifying the subscriber equipment l.

In this way, the subscriber equipment l that has been assigned the time slot of the D channel transmits dial information (information that specifies the communication partner) to the time division multiplex control device 3 through the designated time slot of the D channel. It will be transmitted to. Then, if necessary, this time division multiplex control device 3
The dialing information is given to the relay exchange 4 from there.

Predetermined call processing is then performed according to this dial information. If a communication path can be established with the communication partner, a D channel time slot is similarly assigned to the subscriber equipment 1 of the communication partner. It goes without saying that the time slot of the D channel assigned to the subscriber device 1 at the other end of the communication is different from the time slot of the D channel assigned to the subscriber device 1 on the calling side described above. . At this point, subscriber equipment 1 is assigned only the D channel time slot.

Thereafter, the designated time slot of the D channel is used to allocate a B channel slot for communicating audio information, and at the same time, the B channel slot is used to transmit a ringing signal. As with the time slot designation for the D channel, the time slot designation for the B channel is performed by notifying the calling party and the communication partner subscriber equipment 1 of the slot position and number of bits. be exposed. As a result,
The subscriber equipment 1 is assigned a time slot for the D channel as well as a time slot for the B channel.

After receiving the designation of the B channel time slot in this way, the subscriber equipment 1 notifies the time division multiplex control device 3 of the release of the D channel time slot via the D channel time slot mentioned above. do. Then, upon receiving this notification, the time division multiplex control device 3 releases the D channel time slots set for the subscriber equipment 1 as described above.

Therefore, at this point, only the B channel time slot is allocated to the subscriber equipment 1. Then, between the calling party and the subscriber equipment 1 at the other end of the communication, communication of voice information, that is, a telephone call is carried out using the time slot of the designated B channel as described above.

Thereafter, when the call ends, that is, when the subscriber equipment 1 hooks on, the time division multiplex control device 3 is notified of the end via the R8P. Upon receiving this notification of the end of the call, the time division multiplex control device 3 releases the B channel time slots assigned to each subscriber device 1 as described above.

Such time slot allocation is carried out by, for example, using a channel management table provided in the time division multiplexing control device 3 to determine which time slot is allocated to which east line distribution terminal for each B channel and D channel. Management and seeking free time slots is done.

Note that although the above explanation is an example of time slot allocation in the case of communicating audio information, time slot allocation in other cases is performed in the same manner.

Furthermore, if it is desired to only communicate packet data via the D channel, for example, instead of the above-mentioned communication of audio information, the R8P is used to notify that fact. In this case, only time slot allocation in the D channel is performed.

Furthermore, for example, if communication using a B channel of 64 Kbps or more is required, that is, high-speed multidimensional exchange of (nX 84 Kbps), a plurality of time slots are allocated in the same way. Then, high-speed multidimensional exchange is performed using a plurality of time slots of the designated B channel.

Incidentally, the tree-shaped time division multiplex transmission line 2 described above may be constructed of a coaxial cable, an optical fiber cable, or the like. Further, the signal transmitted through the transmission line 2 may be a baseband signal or a modulated signal.

In particular, when using a wideband transmission line, it is possible not only to use telephone voice and relatively low-speed data communication, but also to
It will be possible to provide CSMA/CD system Nyor high-speed bucket exchange services and multi-channel video services such as those seen on C3TV.

As described above, the subscriber equipment 1 and the time division multiplex controller 3
Signal transmission is performed between them via a tree-shaped time division multiplex transmission path 2 under TDMA control using an individual line individual channel system. Furthermore, as mentioned above, signal transmission is performed between the time division multiplex control devices 3 via the private line 6 using the individual line common channel method, and between the relay exchanges 4 using the common line signaling method to the destination indicated by the control channel D. The data of a plurality of audio channels B are transmitted all at once.

As mentioned above, the time division multiplex control device 3 uses the individual line signal system (individual line individual channel system).

It is equipped with a function to mutually convert the format of signals transmitted using the individual line common channel method) and the format of signals transmitted using the common line signaling method, and can use this function as necessary to perform time division multiplex transmission. The data of voice channel B transmitted via line 2 is transmitted via relay exchange 4.

Therefore, according to this method, information communication between multiple subscriber devices can be carried out in a short period of time by effectively utilizing their communication resources and, if necessary, by directly accessing digital multiplex links between relay exchanges. A network that can efficiently communicate information can be constructed at a low cost. Furthermore, since specific communication information can be communicated all at once via the private line 6, the communication efficiency can be improved for large communication users.

Note that the present invention is not limited to the embodiments described above. For example, the number of subscriber devices 1 connected to the tree-shaped transmission path 2 is not particularly limited, and the number of time slots set for the transmission path 2 is also determined by the number of subscriber devices 1 connected to the transmission path 2. It is only necessary to determine the equipment and its operating rate in advance. Further, if the transmission between the time division multiplex control device 3 and the relay exchange 4 is performed using an individual line individual signaling system or a common line individual signaling system, the load on the time division multiplex control equipment 3 can be reduced. In short, the present invention can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] As explained above, according to the present invention, since the transmission path to which subscriber equipment is connected is tree-shaped, the amount of cables laid can be reduced compared to the case of constructing a conventional star-shaped network. can be significantly reduced. As a result, an information communication network can be constructed at low cost. Furthermore, since the time slots of the transmission path are allocated using TDMA, it is possible to flexibly respond to various service requests. In addition, since the time division multiplex transmission line to which subscriber equipment is connected can be directly connected to the relay exchange, it is possible to flexibly handle large amounts of information communication between remote locations via the relay exchange.
Further, the call setting procedure and the like can be quickly performed in a short period of time, and the communication resources can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an information communication system according to an embodiment of the present invention, and FIG. 2 is a common line signaling system. Figure 3 shows a comparison of the signal formats of the individual line common channel system 1 and the individual line individual channel system, and FIG. It is a diagram. DESCRIPTION OF SYMBOLS 1... Subscriber equipment, 2... Tree-shaped time division multiplex transmission line, 3... Time division multiplex control device, 4... Trunk exchange, 5... Local exchange, 6... Private line.

Claims (2)

[Claims] (1) interconnected via digital multiplex links;
A plurality of relay exchanges or local exchanges that transmit signals using a common line signaling system, a tree-shaped time division multiplex transmission line managed by a first time division multiplex control device, and a connection to this first time division multiplex control device. A plurality of subscriber devices are connected to the first time division multiplex control device via a private line, and signals are transmitted using the individual line common channel system via the private line. a second time division multiplex control device for controlling a plurality of connections connected via a tree-like time division multiplex transmission path managed by the second time division multiplex control device and transmitting signals by an individual line individual channel method; The first time division multiplex control device is configured to control the format of signals transmitted in a common line signaling system between a plurality of trunk exchanges or local exchanges, and to convert individual line individual channels via time division multiplex transmission lines. A function for mutually converting the format of signals transmitted in the common line signaling system between the plurality of trunk exchanges or local exchanges, and a function for mutually converting the format of the signals transmitted in the common line signaling system between the plurality of trunk exchanges or local exchanges, and the format of the signals transmitted in the individual line common channel system via the private line. An information communication system comprising: a function of mutually converting the format of a signal to be transmitted, and wherein the time division multiplex transmission line and the private line are directly connected to the relay exchange or local exchange. (2) The information communication system according to claim 1, wherein the tree-shaped time division multiplex transmission path transmits signals using a TDMA method.