JPH06204966A - Multiplex repeater - Google Patents

Abstract

PURPOSE:To provide a multiplex repeater for efficiently using the communication capacity of a transmission line by automatically changing a line allocated to a time slot. CONSTITUTION:This repeater is provided with input/output interfaces 52 connected to respective ISDN for transmitting/receiving data and a multiple separating circuit 56 for multipleseparating the signals of a channel B received by the input/output interfaces 52. The multiple separating circuit 56 classifies the respective separated signals of the time slots by each transmission destination and multiplexes the classified signals by each ISDN of the transmission destination. Since the classification is performed based on information transmitted to the channel D of the ISDN, the routing of the respective time slots can be dynamically changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple relay device used in ISDN (Integrated Services Digital Network).

[0002]

2. Description of the Related Art Recently, ISDN has been used as one of communication networks.
(Service integrated digital network) is widely used.
This ISDN aims to provide various communication services such as telephone, data, and image by a unified interface by digitally integrating a transmission line and an exchange. For example, as ISDN provided by NTT, INS
There is a net 64 or the like.

The I-interface defines the connection between the network in ISDN and the user terminal. The basic interface of this I interface comprises two B channels (64 kbps) and one D channel (16 kbps). This one B
The channel communication capacity of 64 kbps corresponds to one telephone line. That is, the voice of the telephone line is converted to the normal P
When transmitting by CM, sampling is performed at 8 kHz, which is twice the frequency bandwidth of the telephone line, which is 4 kHz.
When quantized by t, 64 kbps at 8 bits × 8 kHz
Becomes

As described above, one B channel corresponds to one voice call, but since a voice signal is generally extremely redundant, by compressing the amount of information, one B channel has two or more voice lines. Is proposed.

For example, ADPCM (adaptive differential pulse modulation)
Voice is compressed to 32 kbps by using, and two voice lines are loaded on one B channel, and LD-CELP is used.
(Low delay code excitation linear predictive speech coding method)
It has been proposed to compress voice to 16 kbps and mount four voice lines on one B channel. Furthermore, since a high compression rate is desired in recent years, LD-CEL
The voice may be compressed to 8 kbps by using the P system or the like, and eight voice lines may be mounted on one B channel.

An example of such multiplexed communication is described, for example, in Shinichiro Fujishima, published by Rick Telecom, "In-company ISDN construction technology", pages 147 to 151.
FIG. 5 shows 10 described on page 151 of this document.
It is the figure which quoted -6. Shown in the figure is a diagram showing the allocation of time slots when connecting branch lines between Osaka, Nagoya, Tokyo, and Sendai. As shown in the figure, six lines are multiplexed on the transmission line, and each line is assigned to time slots 1 to 6. That is, the multiplexing method shown here is TDM (Time Division Multiplexing), and a line is assigned to each time slot.

For example, as shown in the figure, the line between Osaka and Sendai is assigned to time slot "1", and the line between Osaka and Tokyo is assigned to time slot "2". In the figure, Osaka is represented by M1, Nagoya is represented by M2, Tokyo is represented by M3, and Sendai is represented by M4.

In this example, the capacities of the lines between the points are all the same, but in reality, if the communication volume in Tokyo and Osaka is large, the communication capacities are set to be large (for example, two time slots). To make efficient use of the capacity of the transmission line.

[0009]

As described above, in the conventional method,
It was possible to carry multiple voice lines multiplexed on each B channel. Further, as described above, the line assigned to each time slot is fixed in advance according to the amount of communication between the points, and cannot be changed when the communication equipment is in operation.

Therefore, in some cases, even if a certain time slot is vacant, the communication capacity of another time slot becomes the limit and, for example, a situation where a telephone is not easily connected occurs.

The present invention has been made in view of the above problems,
The purpose is to obtain a multi-repeater device in which the line served by the time slot is automatically changed and the communication capacity of the transmission line can be used efficiently.

[0012]

The first aspect of the present invention is, in order to solve the above-mentioned problems, a multiplex relay device which receives a plurality of signals, multiplexes them, and sends them out to a transmission transmission line. And a destination information signal respectively representing the destinations of the plurality of signals, a plurality of signals received by the receiver, and a plurality of destination information signals of the plurality of signals. A classifying unit that inputs and classifies the plurality of signals for each transmission transmission line that is a destination thereof, and multiplexes the classified plurality of signals for each transmission transmission line to generate a transmission multiplexed signal. Information of the destinations of the plurality of classified signals is integrated for each of the transmission transmission lines, and a multiplexing means for generating a destination information signal; and a transmission multiplexed signal generated by the multiplexing means, The plurality of the plurality of signals that make up the multiplexed signal A destination information signal representing the No. of the destination, a multiple relay device which comprises a sending means for sending each said transmission the transmission path corresponding, the.

In order to solve the above-mentioned problems, a second aspect of the present invention is a multiplex relay for receiving a multiplexed signal in which a plurality of signals are multiplexed from a reception transmission line and sending it to two or more transmission transmission lines. An apparatus, comprising: receiving means for receiving the multiplexed signal from the reception transmission path and destination information signals respectively indicating destinations of the plurality of signals forming the multiplexed signal, and the receiving means. Demultiplexing means for demultiplexing the received multiplexed signal, a plurality of signals demultiplexed by the demultiplexing means, and destination information signals of the plurality of signals are input, and the plurality of signals are transmitted. A classifying unit that classifies each transmission transmission path, and a plurality of the classified signals are multiplexed for each transmission transmission path to generate a transmission multiplexed signal, and a transmission destination of the classified signals. Information of the transmission Each of which is integrated for each destination to generate a destination information signal, transmission multiplex signals generated by the multiplexor, and destination information indicating a destination of the plurality of signals forming the multiplexed signal. And a sending means for sending a signal to each of the corresponding transmission transmission paths.

[0014]

The classifying means in the first and second aspects of the present invention classifies the plurality of signals on the basis of the destination information signals representing the destinations of the plurality of signals. Therefore, when the transmission destination information signal changes, the transmission destinations of the plurality of signals forming the multiplexed signal output to each transmission transmission line change.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an example of a communication network using a multiple relay device according to an embodiment of the present invention. As shown in the figure, in this embodiment, the multiplex relay device 50 according to the present invention is installed at four points P, Q, R and S, and IS is provided between these four points.
A communication network is established using DN. ISD
N is its basic interface (2 B channels and 1
1 D channel) is used, but FIG.
In FIG. 1, only one B channel is shown for ease of understanding, and the other one B channel is omitted.

The data of the voice signal of the telephone is 16
It is compressed to kbps and is supplied to the multiplex relay device 50 via the PBX provided at each point. The multiplex relay device 50 multiplexes this voice signal on the ISDN B channel and sends it out. As mentioned above, the B channel is 64 kb
Since there is a communication capacity of ps, data of 16 kbps is 4
This can be multiplexed.

When the voice signal from the telephone is input through the PBX, the multi-repeater 50 searches for an available time slot out of the four time slots of the B channel, and searches for an available time slot. The audio signal is compressed and assigned. Then, the destination of the audio signal of the assigned time slot is notified to the other multiplex relay device 50 through the D channel.

The characteristic feature of the multiplex relay apparatus 50 in this embodiment is that, in this way, through the D channel,
In other words, the destinations of the signals on the time slots of the B channel are made known to the connected multiple repeaters.
Thus, every time a line is allocated to each time slot, the source and destination of the signal on that time slot are determined and transmitted to the multiplex relay device 50 connected through the D channel. In this way, each time a call request (hereinafter referred to as a call) is generated, it is assigned to an available time slot, so that the time slot can be efficiently used on the B channel. .

For example, the multiplex relay device 50q at the point Q in FIG. 1 uses all four time slots of the B channel, two of which are for point P and the other two are for point R. Is. Therefore, the multiplex relay device 50q
The destination of the communication on each time slot is transmitted to the multiplex relay device 50s by using the D channel.
Based on this information, s can classify the communication on each time slot for each desired transmission line (ISDN). Then, the multiplex relay device 50s multiplexes each transmission line and sends out this multiplexed signal.

In FIG. 1, the multiplex relay device 50s is
Of the four communications from point Q, two are to point P and the other two
Each of them is sent to the multiplex relay device 50 (p and r) at the R point.

FIG. 2 is a block diagram showing the structure of the multiplex relay device 50. As shown in the figure, the multiplex relay device 50 has an input / output interface 52 for transmitting / receiving to / from the ISDN. In this embodiment, two B channels are provided so that connection with the ISDN can be performed.
The individual input / output interfaces 52-1 and 52-2 are provided and are connected to the ISDN. However, when there is only one ISDN to be connected like the points P, Q and R in FIG. 1, nothing is connected to one input / output interface 52.

The input / output interface 52 is an ISDN.
Signal is received, divided into B channel and D channel, and supplied to the subsequent demultiplexing circuit 56 and demultiplexing circuit 58.
In this embodiment, like the input / output interface 52, three demultiplexing circuits 56 are provided corresponding to each input / output interface, and a B channel signal of 64 kbps is provided in each of four time slots. Each signal is demultiplexed into 16 kbps signals. The D channel signal is supplied to the subsequent classification circuit 58. The classification circuit 58 is 4
The 16 kbps signals are classified by destination according to the D channel signal from the input / output interface.

This structure is a characteristic structure of the present embodiment, and has various operational effects. As described above, since the information of the destination of each time slot of the B channel is transmitted through the D channel, the classification circuit 58 classifies the signal of each time slot of the B channel based on this information. It is possible to In this classification, the signal of the open time slot and the signal representing the transmission destination are classified for each transmission destination, and the demultiplexing circuit 56 is controlled.

In this classification, the signal of the time slot is sent to the PBX interface 60 which is an interface to the PBX installed at the point where the transmission destination is the point where the multiplex relay device 50 is installed. The compressed signal is expanded via the Udec circuit 59, and the signal from the PBX is compressed and supplied. The PBX interface 60 supplies the signal of the time slot to the telephone set or the like via the PBX in order to secure a communication line with the telephone set, the data terminal or the like installed at this point.

On the other hand, in the above classification, the time slot signal is supplied to the demultiplexing circuit 56 for sending to the ISDN to another point if the destination is another point. In the demultiplexing circuit 56, the destination is the ISD corresponding to the destination.
A plurality of N time slot signals are multiplexed and a B channel signal to be output to the ISDN is created. Further, the separating circuit 58 also creates a signal to be output to the D channel of the corresponding ISDN. That is, the signal indicating the destination of the signal of each time slot included in the B channel is D
Sent to the channel. The signal transmitted to the D channel is used when the time slot signal is classified again in another multiplex relay device 50 connected to the end of ISDN.

As described above, in the multiplex relay device 50 in this embodiment, the destination of each time slot is transmitted through the D channel, so that so-called routing can be performed dynamically.

Signals from the PBX at the same point where the multiplex relay device 50 is installed are also classified according to the transmission destination in the same manner as signals from the ISDN are classified, and then the transmission destination is Each ISDN is multiplexed and transmitted.

Next, how the routing is dynamically performed will be described with reference to FIGS. 1, 3 and 4.

In FIG. 1, as described above, two lines are communicated between the P point and the Q point, and two lines are similarly communicated between the R point and the Q point. ing.
Here, the communication of the two lines between the P point and the Q point is performed using the time slots 1 and 2, and the communication of the two lines between the R point and the Q point is performed in the time slot. 3 and 4
Be done using.

From this state, 2 between the R point and the Q point
FIG. 3 is a diagram showing a state in which line communication is completed. Next, FIG. 4 shows a situation in which one new communication (call) is made between the P point and the Q point. As shown in FIG. 4, this new communication (call) is performed using the time slot 3. What is characteristic of this embodiment is that each time slot is thus assigned each time a call occurs. Therefore, conventionally,
The communication that each time slot that composes the multiplexed signal is responsible for is fixed between, for example, a certain point and a certain point, but since it is dynamically assigned, the communication capacity of the transmission line is efficiently It is possible to use. This is because the destination of the signal (call) of each time slot is transmitted to the other party's multiplex relay device 50 using the D channel of ISDN, as described above, so that the destination of the signal (call) of the time slot is fixed. This is because it has become possible to change dynamically without doing so.

In the above embodiment, the multiplex relay device 50 is used.
s relays the signal (call) from the multiplex communication device 50q from the Q point to the P point or the R point, but the signal (call) from the telephone or the like connected to the multiplex relay device 50s.
Can be sent to the P point or the R point by the same operation. In this case, needless to say, the same operational effects as those of the above-described embodiment are obtained.

As described above, according to this embodiment, the IS
The multiplexed signal is placed on the B channel of DN, and the transmission destination of the signal of each time slot forming the multiplexed signal is set to ISDN.
Since it is transmitted through the D channel of, the source and destination of the signal which each time slot is responsible for can be changed dynamically without being fixed. As a result, by using this multiplex relay device, it is possible to construct a communication network that can efficiently use the communication capacity of ISDN.

[0034]

As described above, according to the multiplex relay apparatus of the present invention, the destinations of a plurality of signals forming a multiplexed signal on a transmission line change depending on each communication (call). Therefore, conventionally, the transmission destinations of a plurality of signals forming the multiplexed signal on the transmission path are predetermined and fixed, but the utilization efficiency of the transmission path can be increased. As a result, the use of the multiple relay device according to the present invention has the effect of realizing a communication network with high utilization efficiency of transmission lines.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a communication network using a multiplex communication device according to a preferred embodiment of the present invention.

FIG. 2 is a block diagram of the configuration of the multiplex relay device of the embodiment of FIG.

FIG. 3 is a diagram showing a state in which two communications (calls) are completed from the state of FIG.

FIG. 4 is a diagram showing a state where one communication (call) is newly started from the state of FIG.

FIG. 5 is a diagram showing allocation of time slots in an example of a conventional communication network.

[Explanation of symbols]

 50 Multiplexing device 52 Input / output interface 56 Demultiplexing circuit 58 Common signal control circuit 59 Codec circuit (compression / expansion circuit) 60 PBX interface

Claims (2)

[Claims] 1. A multiplex relay device for receiving a plurality of signals, multiplexing the signals, and sending the multiplexed signals to a transmission channel, wherein the plurality of signals and the destinations of the plurality of signals constituting the multiplexed signal are respectively transmitted. Receiving means for receiving the destination information signal, a plurality of signals received by the receiving means, and destination information signals of the plurality of signals are input, and the plurality of signals are designated as the destination. Classification means for classifying each of the transmission transmission paths, the plurality of classified signals are multiplexed for each of the transmission transmission paths, a transmission multiplexed signal is generated, and information of the destinations of the classified plurality of signals is generated. Is integrated for each of the transmission transmission lines to generate a destination information signal, a transmission multiplexed signal generated by the multiplexing means, and the transmission of the plurality of signals forming the multiplexed signal. Destination information signal indicating destination A multiple relay device which comprises a sending means for sending each said transmission the transmission path corresponding, the. 2. A multiplex relay device for receiving a multiplexed signal obtained by multiplexing a plurality of signals from a reception transmission line and transmitting the multiplexed signal to two or more transmission transmission lines, wherein the multiplexed signal is transmitted from the reception transmission line. And receiving means for receiving destination information signals respectively representing destinations of the plurality of signals forming the multiplexed signal, and demultiplexing means for demultiplexing the multiplexed signal received by the receiving means. A plurality of signals separated by the demultiplexing means and a destination information signal of the plurality of signals are input, and the plurality of signals are classified by each transmission transmission path serving as a destination, The classified plurality of signals are multiplexed for each of the transmission transmission lines to generate a transmission multiplexed signal, and the information of the transmission destinations of the classified plurality of signals is integrated for each of the transmission transmission lines and transmitted. Generate destination information signal A multiplexing means, a transmission multiplexed signal generated by the multiplexing means, and a destination information signal representing a destination of the plurality of signals forming the multiplexed signal, for each corresponding transmission transmission path. A multi-repeater device comprising: a sending unit for sending.