JPS5828955B2 - Shusenouchi - Google Patents

Description

[Detailed description of the invention] The present invention relates to a line concentrator.

Concentrating multiple lines into a time-division multiplex transmission line in a line concentrator and connecting it to a central office via a highway is
This is a conventional practice in order to save on line costs, and from a cost standpoint the function of this line concentrator is kept as simple as possible.

An example of the configuration of a conventional line concentrator and central office is shown in FIG.

Many subscriber lines (only one 110 is shown in the diagram)
The line concentrator LC accommodating the network is connected via highway 111 to the central office C8W.

The line concentrator LC always periodically monitors the status of each line (110, etc.), and when a call is made from a certain line, the control unit LC
Under the control of C, the calling information is sent to line 106 and synchronizer 5YN.
L, highway 111, and transferred to central station C8W via synchronizer 5YNC.

This information is processed by the control unit SWC of the central station C8W, and controls the control unit LCC of the line concentrator LC in the reverse route to the previous one.
The calling line number is written to the cyclic memory CM in the area of the address corresponding to the vacant channel of Highway 111, and the calling line is transferred to Highway 1 in a time-sharing manner.
11 to the central station C3W (7"l connection information receiver).

When the calling subscriber sends connection information for connecting to the desired subscriber, this is received by the connection information receiver of the central station C8W mentioned above, and the control unit SWC performs connection control to the desired subscriber. .

Even if the desired subscriber belongs to the same concentrator as the calling subscriber, in the past, in order to avoid complicating the processing at the central office C8W, it was difficult to connect to a subscriber belonging to another concentrator. A similar process is carried out, so that this connection is made by reconnecting the highway 111 at the highway switch H8W of the central office C8W.

In the above-mentioned conventional device, when connecting two subscribers in the same concentrator, the connection between the two channels in one highway is performed by the highway switch H8 of the central station C8W.
However, some types of time-division switches may require special switching equipment to connect two channels within one highway.

In addition, it is necessary to set up a return connection path between the line concentrator LC and the central station C8W, but this is wasteful, and especially when the distance between the line concentrator and the central station is long, transmission delays and increased noise are undesirable. A phenomenon occurs.

Conventionally, the connection between two subscribers in the same line concentrator was made via the central office in order to unify the call connection processing at the central station and to prevent the connection processing unit from becoming complicated. In cases where the transmission line between the central office and the central office is constructed of a multi-stage highway, the conventional system wastes the transmission line, resulting in significant system drawbacks.

The present invention eliminates the above-mentioned drawbacks of the conventional device, eliminates waste by configuring the connection paths between subscribers accommodated in the same concentrator within the concentrator, and furthermore, eliminates unnecessary connections between the subscribers accommodated in the same concentrator. It is an object of the present invention to provide a line concentrator that does not lose the uniformity of processing.

The purpose of this invention is to provide a line concentrator for concentrating a plurality of lines into a highway consisting of time-division multiplexed transmission lines, which connects a highway connected to a central office, a highway turned back within the line concentrator, and each of the above-mentioned highways. A control memory for controlling the highway is provided, and connections between lines accommodated in the same line concentrator are achieved by a line concentrator configured to perform via the above-mentioned turned-back highway.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a block diagram of a line concentrator embodying the present invention.

In the figure, the concentrator LC has two highways 211 and 212 for the central station C8W, and two highways 213 and 214 for turning back within the concentrator.

Cyclic memories CM1-CM4 are provided for highways 211-214, respectively.

Now, for example, if there is a call from the line 110, the control unit LCC detects this as in the case of Fig. 1, and the control unit LC
C strand wire 106, highway 211, synchronizer 5YNL
, Highway 111, and the synchronizer 5YNC transfer this call information to the central station C8W.

This information is processed by the control unit SWC of the central station C8w, and controls the control unit LCC of the line concentrator LC in the reverse route to the previous one.
For example, the calling line number is written in the cyclic memo IJcM1 in the address area corresponding to the vacant channel of Highway 211, and the calling line receives connection information of the central office C8W via Highway 21L111 in a time-sharing manner. connected to the device.

Here, if the calling subscriber sends connection information for connecting to the desired subscriber, this is received by the connection information receiver of the central station C8W mentioned above, and the control unit SWC sends connection information for connecting to the desired subscriber. Connection control is performed.

At this time, if a subscriber accommodated in another line concentrator (not shown) is connected to the subscriber 110 of the illustrated line concentrator LC, the corresponding connection information is transmitted from the control unit SWC of the central station C8W to the synchronizer 5YNC, the highway 111, synchronization device 5
YNL Highway 211, via line 106 to control unit LCC
Based on this, the control unit LCC transfers the data to the cyclic memory CM corresponding to the highway 212, for example.
2, the desired subscriber number is written in the ATIS area corresponding to the vacant channel of Highway 212.

As a result, the calling subscriber is time-divisionally connected to the desired subscriber.

If a connection is to be made between subscribers of the same concentrator (e.g. LC as shown), the control SWC of the central station C8W provides information regarding the connection via line 106 to the control LCC, so that the The connection information is written in the cyclic memory CM3 corresponding to the highway 213 as described above, and the calling line 110 and the highway 213. A specific channel of
The same number as the channel used on the highway 213 is written, and the called party and the specific channel on the highway 214 are connected in a time-sharing manner.

Note that the highways 213 and 214 are connected to the phase matching circuit 20.
2 to absorb the difference in operating time of each highway.

This can for example consist of a simple loopback to another highway via a flip-flop circuit.

In the figure, MPX is a demultiplexing unit for each line.
10, etc.) and the output is sent to line 105 (first
(Fig. 2) or line 203 (Fig. 2), and also serves to separate multiplexed signals arriving from one line 203 into subscriber lines.

Line 203 is provided on the multiplexed side of demultiplexer MPX, is connected to highway distribution circuit 201, and functions to distribute subscriber lines to highways by cyclic memories CM1 to CM4.

In addition, a cyclic memory switching circuit SEL is provided,
The cyclic memories CM1 to CM4 are switched to control the demultiplexer MPX and the highways 211 to 214 in a time-division manner.

The time for one subscriber line channel allocated to highways 211 to 214, etc. is divided into four equal parts, and each of the divided parts is controlled by each cyclic memory CM1 to CM4, in other words, each cyclic memory CM1 to CM4. The configuration is such that information for each channel is transferred from the demultiplexer MPX to the highway, or vice versa, within the allocated time, and four cyclic memories CM1 to CM4 provide one Demultiplexer MP
It is possible to control X.

Note that if the number of lines 203 is increased to, for example, four lines, the clock rate will be the same as that of the highway.

Looking at this connection from the perspective of connection processing from the control unit SWC of the central station C8W, as shown in FIG. The connection information is transferred to the control unit of the central station C8W via an actual highway 111, processed by the control unit SWC, and sent via the existing highway 111 to the concentrator where the desired subscriber is accommodated. , its control unit LCC controls the cyclic memory to connect the vacant highway channel and the desired subscriber line in a time-division manner.

When connecting to a subscriber accommodated in the same concentrator (for example, the LC shown in the figure) as the calling subscriber, connection information and control information are received and received via the real highway 111, and the actual connection is controlled by the connection control information. The click memories CM3 and CH2 are operated to connect the calling subscriber to the highway 213, and the virtual synchronizer 5YNL and the highway 1 are connected to the calling party.
13. Synchronizer 5YNC1 and virtual highway switch of central office (not shown), virtual synchronizer 5 shown by dotted line
YNC, Highway 114, Synchronizer 5YNL.

The connection is virtually extended to the actual highway 214 and then actually connected to the highway 214 to the desired subscriber.

Virtual highways 113 and 11 by connection control information
Cyclic memory commercial as if 4 were real
3, a connection is established by CH2, but by controlling in this manner, both subscribers are actually connected via the existing highway 213, phasing circuit 202, and highway 214.

From the viewpoint of the control unit SWC of the central station C8W, it is possible to connect using the same process as connecting to a subscriber accommodated by another concentrator where the highway corresponding to the above-mentioned virtual highway actually exists, which impairs the uniformity of the connection process. Never.

In the line concentrator LC shown in FIG.
In principle, there are no particular restrictions on increasing the number of turnaround highways within C.
It is sufficient to provide a memory to increase the multiplexing speed of the demultiplexer MPX.

However, it will be necessary to add two turnaround highways within the concentrator.

This state is shown in FIG. In the figure, there are h highways 21-1 to 21-h connected to the central office.
・2l-nl and 21n2 are each phase matching circuit 2
02-k...202-n constitutes a turnaround highway.

And cyclic memory C corresponding to each highway
M1...CMh, CMkl, CMk2...CMn
1, CMn2 are provided.

However, because of this configuration, the number of highways that can be added is limited by the operating speed of the multiplexer/demultiplexer MPX or the multiplex line 203.

FIG. 5 is a block diagram of a different embodiment of the invention.

This embodiment shows an example in which one highway is used for turning back within the line concentrator LC.

For convenience of explanation of operation, each of the highways 211 and 212 and the line 106 are divided into a downstream data line (direction coming from the central office) and an upstream data line (direction going toward the central office), and are indicated by a and b, respectively. .

500 is a phase matching circuit for each highway of data lines 212b and 211a and 212a and 211b, which are connected to the OR circuit OR via line 502 and to the data line 211b via line 501, respectively.

The OR circuit OR outputs the logical sum of data lines 503 and 502 to data line 211a.

The operation of this embodiment is as follows.

When connecting a subscriber line accommodated in this line concentrator LC to a line other than this line concentrator, use highway 211a.

b is used.

At this time, Highway 212a. For the cyclic memory CM2 having opening/closing information of b, the highway 211a used for connection.

Highway free information is written in the address corresponding to the channel number b, and the highway data that passes through the line 501, the phase matching circuit 500, and the data line 212a does not flow into the subscriber line side, and the data line 212b, the phase Highway data passing through the matching circuit 500 and line 502 does not flow in from the subscriber line side, so it is always logic II O.
I+, and in the end, the data on the multiplex transmission line from the central office is sent to the synchronizer 5YNL line 503, the OR circuit OR, and the data line 2.
11a, highway distribution circuit 201. multiplet line 203a,
The subscriber line 110 is separated into the subscriber circuit 5UB1 via the demultiplexing unit MPX, and at the same time, the data of the subscriber line 110 is multiplexed onto a multiplex line via the reverse route, similar to the case of one normal highway. demultiplexing is realized.

In the case of interconnection of two subscribers housed in the same concentrator, one subscriber line, e.g. calling line 110, connects to highway data lines 211a, 211b, and the other subscriber line 120 connects to highway data lines 211a, 211b. 212a, 212b
Connect to.

However, data lines 211a, 212a, 211b and 212
It is assumed that b is the same channel number used on each highway, and that the channel with the above number on the highway connecting the central office and the line concentrator LC is vacant.

At this time, one line, for example, the calling line 110, includes the subscriber circuit 5UB1, the demultiplexer MPX, the multiplex line 203b, the highway distribution circuit 201, and the highway data line 211b.
, line 501, phase matching circuit 500, data line 212a, highway distribution circuit 201, multiplex line 203a, demultiplexer MPX, subscriber circuit 5UB2, subscriber line 120. , subscriber circuit 5UB2, demultiplexer MPX, multiplex line 203
b. From the subscriber circuit 5UB1 to the subscriber line 11 via the highway distribution circuit 201, data line 212b, phase matching circuit 500, line 502, OR circuit OR, and data line 211a.
0, and both subscribers are looped back within the concentrator.

In this embodiment, by providing one highway within the line concentrator LC, loopback connections within the line concentrator are possible without impairing the uniformity of connection processing at the central office.

As described above, the present invention enables mutual connection between subscribers accommodated in the same line concentrator within the line concentrator without using a connection path via the central office. It is possible to save on transmission lines between offices and highway switches within the central office, and since there are no unnecessary transmission lines, disadvantages in transmission, such as transmission delays and increased noise, can be prevented.

The economical effect is particularly large when there is a large amount of traffic between subscribers accommodated in one line concentrator or when the distance between the line concentrator and the central office is large.

Furthermore, in the present invention, the connection of the line concentrator is controlled by the control section of the central office, but when this control section performs storage program control processing, the connections between subscribers within the same line concentrator are also As already explained with reference to FIG. 2, ordinary connections of Processing can also be unified in terms of software configuration.

In addition, a return highway can be connected to a central office as a normal highway by adding a synchronizer and a time division multiplex transmission line, and can also be connected to a central office as a normal highway by adding a synchronizer and a time division multiplex transmission line. By removing the transmission line and providing a loopback phase matching circuit in the concentrator, it is possible to create a highway for loopback within the concentrator, allowing flexible configuration of the concentrator system according to local conditions and traffic fluctuations. be.

In addition, since there is no need to use a highway switch at the central office for connections within the concentrator, traffic
This also has the effect of reducing the load on the central office.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional line concentrator, FIG. 2 is a block diagram of a line concentrator embodying the present invention, and FIG. 3 is an explanatory diagram of the connection type within the line concentrator as seen from the control section of the central office. FIG. 4 is a block diagram of another embodiment of the invention, and FIG. 5 is a block diagram of still another embodiment of the invention. In the figure, LC is a line concentrator, C8W is a central office, and SUB
, 5UB1, t5UB2 are subscriber circuits, MPX is a demultiplexing unit, CM1 to CM4 to CMn are cyclic memories, LCC is a control unit, and 5YNL. 5YNC is synchronizer 105, 21L212°213.2
14. 21-1 to 21-h, 21-1 to 2l-n2 are highways, 202, 202 to 202-n, 500
is a phase matching circuit, and 11L112 is a time division multiplex transmission line.

Claims (1)

[Claims] 1. In a line concentrator that concentrates multiple lines into a highway consisting of time-division multiplexed transmission lines, the highway is controlled for the highway connected to the central office, the highway that turns back within the line concentrator, and each of the above highways. 1. A line concentrator comprising: a control memory for controlling a line concentrator, and interconnecting lines accommodated in the same line concentrator via the above-mentioned turned-back highway.