JPH01265799A - Subscriber line concentrator - Google Patents

Abstract

PURPOSE:To obtain an economical subscriber line concentrator system with excellent flexibility in the design of a station where the work is attained without stopping the subscriber service even in unscheduled case by changing the line concentration ratio in the unit of concentrators. CONSTITUTION:A time division exchange network 1 connects to a line concentrator 3 through a time division multiplex bus 2 and the time division exchange network 1, the line concentrator 3 and the time division multiplex bus 2 are of duplicated structure. The change of the line concentration ratio is applied in the unit of line concentrators 3. Thus, the economical subscriber line concentration system having a flexibility to the design of an exchange station making the work possible without stopping the subscriber service is obtained even in unscheduled case.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a subscriber line concentration system for performing digital line concentration in a telephone exchange.

[Conventional technology]

In the conventional subscriber line concentration system, as shown in FIG. ,
By allocating a call signal to an arbitrary time slot 1- of the plurality of line concentration buses 1-2 by the line concentration switch 15 in the subscriber circuit unit 13, the calls of the subscribers accommodated in the plurality of subscriber circuit units 13 are The line was concentrated and connected to the time division switching network 1 through the line concentrator 1 and the multiplex line 2.

[Problem to be solved by the invention]

In the conventional subscriber line concentration system described above, when changing the line concentration ratio, the number of subscriber circuit devices accommodated in each line concentrator must be changed. Therefore, in locations where the concentration ratio is expected to increase after the telephone exchange starts operating, the equipment should be designed to accommodate the equipment at the expected maximum concentration ratio, and the maximum number of connectors required for the concentration bus should be designed. In addition, the equipment rack must also have a spare overhead space (') for accommodating the subscriber circuit. In addition, if the line concentration ratio after the operation is required to be lowered, the subscriber circuits are accommodated in a separate line concentrator. Therefore, an empty area may appear on the equipment rack.

As mentioned above, in the conventional subscriber line concentration system, changing the line concentration ratio must be planned from the beginning, and it is not easy to implement construction work that is not in the plan. In particular, there is a problem in that it is difficult to carry out work to change the concentration ratio without stopping subscriber services.When making preliminary plans, it is necessary to leave a spare area open and prepare connectors. There is a second problem with the economy.

An object of the present invention is to change the concentration ratio using the concentrator as the priority, thereby making it possible for the switching center to change the concentration ratio to 2"11" without interrupting subscriber services, even if the concentration ratio is not planned. The purpose of the present invention is to provide an economical subscriber line concentration system that is flexible and compatible with the ``Setup R''.

[, To solve the problem σ) Means ゛1 The subscriber line concentration system of the present invention is a subscriber line concentration system that performs digital line concentration of a telephone exchange, by duplicating the line concentration circuit and connecting a time-sharing exchange network 1 to a plurality of networks. The concentrator is connected to the concentrator via a time division multiplex bus for communication and control information transmission, and is equipped with a concentrator number designation switch and a memory for allocating communication channels in two time slots of the time division multiplex bus. The concentrator, which connects and concentrates subscriber circuits, is configured to condense the subscriber's calls further to the time division multiplexed bus.
The configuration is such that the lines are concentrated at.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The time division switching network I/network 1 is connected to a concentrator 3 by a time division multiplex bus 2.The time division switching network 1, time division multiplex bus 2, and concentrator 3 each have a duplex configuration. have. The line concentrator 3 includes a subscriber switch 4 that connects a subscriber's line and a specific channel of the time division multiplexed bus 2, and a microprocessor 5 that controls the connection.
, a call channel allocation memory 6 that stores the channel number assigned to the subscriber's call path, and a line concentrator 3 that connects up to four devices to the same time division multiplexed bus 2. There is also a concentrator number designation switch 7 that specifies whether there is one. The line concentrator 3 is connected to three subscriber circuits 8 via multiplex lines 10, respectively. The multiplex line 10 has a configuration of 96 channels. The subscriber circuit 8 accommodates 96 subscribers, multiplexes the 96 calls through a multiplex circuit 9, and connects to a multiplex line 0. Note that the subscriber circuit 8 does not have a duplex configuration.

Next, the operation of the line concentrator 3 will be explained.

Allocated memory for communication with microprocessors 6
has the function of causing the subscriber switch 4 to connect the subscriber's communication path to the time slots 1 to 1 of the time division multiplexed bus 2 in accordance with instructions from the exchange rough 1-ware. The east line device number designation switch 7 is a switch for identifying multiple concentrators 3 connected to the time division multiplex bus 2, and takes values from #0 to #3 for the 9 time division multiple bus 2. is 1
．． In addition to this, it has a control tie bus Vals J] Transfer of numerical values and fault information of line concentrator 6'3 are performed, and in the down direction, control of subscriber switch 4 and system control of line concentrator W3) f.
A second instruction will be given. To transmit the line scanning information, a specific one of the control time slots mentioned above is fixedly allocated to each subscriber's terminal number (=t4f. Therefore, the line concentrator 3 uses its own device number. The line scanning information of 96x3 subscribers belonging to the self is inserted into the time slot and soto stored in advance according to the OJ.
Unless a number is given to identify the line concentrator 3, it is not suitable for maintenance purposes. The line concentrator number designation step I7 has become necessary due to these circumstances. In addition, Micro 10 Setza 5 and call channel allocation memory 6
has the function of causing the subscriber switch 4 to connect the subscriber's communication path to the time slot of the time division multiplexed bus 2 according to instructions from the exchange rough 1-ware.

−〇− Next, the concentration ratio of subscriber circuit i ¥88 will be explained.

The line concentrator 3 connects the subscriber circuits 8 (Zunawa L), (→6) to the time-sharing winter bus 2.
Since the lines are concentrated in 120 channels, there are 2.41 lines concentrated in the line -].Furthermore,
Since the time division multiplex bus 2 is shared with another line concentrator 3,
Due to the number of shared pieces, the final east line ratio is 2.4Xn
: 1 (n=1.2.3.4>z, that is, 241 to 9
It is possible to select from four levels of values up to 61.

Next, the procedure for changing the east line ratio will be explained with reference to the drawings.

Figure 2 is a construction procedure diagram for changing the concentration ratio.

In this example, the concentration ratio is increased from 481 to 721.

In the figure, the symbols 21, 22, 23, 2 and 3 are one side of a duplex time division multiplex bus, respectively.

32, 33, 3, 4, 35, 36, and 37, 38 are each one side of the duplexed line concentrator. The codes such as <0.0>, (1, 1, >, etc. written on the right side of each concentrator are numbered from 0 to This indicates the number of the line concentrator.

First, put all the equipment involved in the construction work (in Figure 2, one side of the line concentrator 31.33, 35.37 and one side of the time division switching network I/network 1 connected to these) into sleep mode. 9 Next, change the setting of the concentrator number designation switch on one side 35 of the concentrator from #0 to #2, and change the setting of the concentrator number designation switch on one side 37 of the concentrator from #1 to #0. Change to Next, time division multiplexed bus 2], +'
2 The cable of B is shown in Fig. 2 (a, ) to Fig. 2 (
7). Next, at the same time as replacing the station data of the replacement hardware with the parent terminal number, the device (not shown in FIG. 2) is switched between the active system and the idle system. Continuing on, change the setting of the concentrator number designation switch on one side 36 of the concentrator of the device that is newly inactive from #0 to #2, and also set the concentrator number designation switch on one side 1i'1j138 of the concentrator. , from #1 to #0.The 6th order time-division multiplex bus 22°24 cabling is changed from J: shown in Figure 2 (b> to Figure 2 (c)). complete.

[Effect of invention]

As explained above, the present invention changes the concentration ratio on a concentrator-by-concentrator basis, thereby making it possible to carry out construction work without suspending subscriber services even if it is not planned in advance. This has the effect of providing an economical subscriber concentration system with flexibility in design.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a construction procedure diagram for changing the acquisition ratio, and Fig. 3 is a block diagram of a conventional subscriber line concentration system.・-Time division switched network I-network, 2. Time division multiplexed bus, 3. ]1 ・
・Line concentrator, 4. Subscriber switch, 5. ・Microprocessor module 16.--Speech channel assignment memory, 7-.Line concentrator number specification switch, 8. Subscriber circuit, 9. ]2...Multiple circuit, 10 Multiline, ]3
Subscriber circuit equipment, 15/Concentration Sui Sochi, 21.2
2,23゜24--One side of the duplex time division multiplexed bus, 3], 32.33.34,35.36,37.3
8. -One side of a duplexed line concentrator. Leopard 2 (2)

Claims (1)

[Claims] In a subscriber line concentration system that performs digital line concentration in telephone exchanges, the line concentrator circuit is duplicated, and the time division switching network and the plurality of line concentrators are connected via a time division multiplex bus to transmit calls and control information, and the line concentrator number is The concentrator, which has a designated switch and a call channel allocation memory for time slots on a time division multiplexed bus, connects and concentrates a plurality of subscriber circuits, further transfers the calls of the concentrated subscribers on the time division multiplexed bus. A subscriber line concentration method characterized by concentrating lines.