JPH0371840B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] In a subscriber line concentrator, a common subscriber circuit insertion socket for analog subscribers and digital subscribers is provided in the interface section with the subscriber line, and Depending on whether the terminal device is an analog terminal device or a digital terminal device, a package for an analog subscriber circuit or a digital subscriber circuit is inserted into the socket, and the output signal from the socket is accommodated in a concentrator switch without distinguishing between data and signals. This eliminates the need for a main distribution frame (MDF).

[Industrial application field]

The present invention relates to a subscriber line concentrator, and more particularly to a line concentrator that eliminates the need for a main distribution frame (MDF) and the work of connecting jumper wires.

[Conventional technology]

A conventional subscriber line concentration system is shown in FIG. In FIG. 4, a plurality of subscriber lines 2 bundled into a subscriber cable 1 are accommodated at one end of an MDF 3.
The other end of the subscriber line 2 is connected to an analog subscriber terminal 4a or a digital subscriber terminal 4b, or
Alternatively, it remains vacant when there are no subscribers. The analog subscriber line 5a connected to the other end of the MDF 3 is housed in an analog subscriber circuit 7a fixedly provided in the line concentrator 6, and the digital subscriber line 5b is housed in the line concentrator 6. It is housed in a digital subscriber line 7b that is fixedly provided in the digital subscriber line 7b.

Within MDF3, line concentration and traffic balance,
The service order construction function accompanying subscriber movement such as moving or switching from an analog terminal device to a digital terminal device by a subscriber is carried out between the subscriber line 2 and the analog or digital subscriber line 5a or 5b. This is realized by connecting the jumper wires 8.

[Problems to be solved by the invention]

According to the above-mentioned conventional method, since the jumper wire connection work is performed by obtaining the wire, a dedicated person is required for this connection work, resulting in a problem that the labor cost is high. Another problem is that MDF cannot be made smaller because the wiring work is done manually.

[Means for solving problems]

In order to solve the above problems, what is provided by the present invention is as shown in FIG.
0 is a line concentrator accommodating a plurality of subscriber lines, and includes a plurality of subscriber circuit package insertion sockets 6 provided at an interface with the subscriber lines.
9 and 1 of the subscriber circuit package insertion socket.
an analog subscriber circuit package that is inserted into the subscriber line and converts the analog signal from the subscriber line into a digital signal in a predetermined data format corresponding to the analog signal; and a subscriber circuit package insertion socket.
A digital subscriber circuit package inserted into the subscriber line and converting the digital signal from the subscriber line into a digital signal in a predetermined data format corresponding to the digital signal, and a subscriber circuit package inserted into the subscriber circuit package insertion socket 69. A processor 66 identifies whether the subscriber circuit package is an analog subscriber circuit package or a digital subscriber circuit package based on preset data, and a subscriber circuit package inserted into the subscriber circuit package insertion socket under the control of the processor. A line concentrator switch 61 is provided for switching the output of a subscriber circuit package insertion socket depending on whether the circuit package is an analog subscriber circuit package or a digital subscriber circuit package. a scanning memory 64 for scanning signals from the digital circuit package;
A signal distribution memory 65 for distributing signals to analog subscriber circuit packages and a D for data link (LAP-D) termination of control signals on the D-channel between the digital subscriber circuit packages.
- a channel signal processor 63, the shape of the subscriber circuit package insertion socket 69 is the same for analog subscribers and digital subscribers;
The subscriber circuit package on the primary side identifies whether the analog circuit package is a digital subscriber circuit package, and the signal time slots of the analog subscriber circuit package are used in scanning memory 64 and signal distribution memory 65 to identify whether the analog circuit package is a digital subscriber circuit package. The time slot is a subscriber line concentrator characterized by semi-permanent switching to the D-channel signal processor 63.

[Effect]

A socket for inserting a subscriber circuit package is provided in the interface part of the concentrator with the subscriber line, which has a common circuit shape for analog subscribers and digital subscribers, and the package inserted into the socket is used for analog subscribers. The processor stores in advance whether it is for digital or digital use, and the output of the socket is switched by a concentrator switch under the control of the processor. Therefore, when a subscriber moves, etc., the user can simply replace the subscriber circuit package and set it in the processor. All you have to do is change the data, and MDF is no longer necessary. In addition, a D-ch processor 63, SCN
By providing memory 64 and SD memory 65,
Since analog and digital signal devices can be installed according to the proportion of analog devices and digital devices, the cost of switching equipment can be reduced.

〔Example〕

FIG. 1 is a block diagram showing a subscriber line concentrator according to an embodiment of the present invention. In FIG. 1, a concentrator 60 includes a concentrator switch 61 and a network interface (NWIF) 6 connected to the concentrator switch 61.
2. D-channel signal processor 63, scanning memory 64, signal distribution memory 65, and line control memory (LCM) 66, and line processor (LPR) 68 connected to these devices 63-66 via bus 67. It is equipped with, and furthermore,
At the interface with the subscriber lines 2, subscriber circuit insertion sockets 69 are provided corresponding to a plurality of subscriber lines 2, respectively.

If the terminal device connected to the subscriber line 2 is an analog terminal device 4a, insert the analog subscriber circuit package into the corresponding subscriber circuit insertion socket 69, and if it is a digital terminal device 4b, insert the analog subscriber circuit package into the corresponding subscriber circuit insertion socket 69. A digital subscriber circuit package is inserted into the circuit insertion socket 69. When the subscriber line 2 is in an empty state with no terminal equipment connected to it, no subscriber circuit is inserted as shown by the dotted line in the figure.

The output signal from the subscriber circuit insertion socket is
The audio signal and control data from the analog terminal device 4a and the data and control signal from the digital terminal device 4b are accommodated on the primary side of the concentrator switch 61 via the primary side highway 3 of the concentrator switch 61 without distinguishing them. .

FIG. 2 shows the data format on the primary highway 3 of the concentrator switch 61. As shown in FIG. 2a, one frame of data and signals on the primary highway 3 of the concentrator switch 61 is transmitted at 125 μS, and each frame is transmitted in a data format consisting of n channels. Each channel consists of 8 bits. , , , and has a total capacity of 32 bits. For example, the internal time slot is B1~
It consists of 8 bits of B8. One channel corresponds to one analog or digital subscriber terminal, and each subscriber terminal's data and signals are allocated to internal time slots. Figures 2b and 2c show the data formats of an analog subscriber's downlink highway and one highway channel, respectively. As shown in the figure, the analog subscriber's highway includes 8-bit audio signals B1 to B8 in one channel, and the downlink highway further includes eight types of distribution signals SD _a to SD _h to the analog subscriber. Also included. One upstream highway channel includes audio signals B1 to B8 and eight types of scanning signals SCN _a to SCN _h from analog subscribers. The distribution signals _SDa to _SDh include a ringer sending instruction signal for ringing the bell of the telephone, and the scanning signals SCNa _{to SCNh} include a detection signal of on-hook and off-hook of the telephone. Figures 2d and 2e show data formats for one channel of a digital subscriber's down-highway and up-highway, respectively. The downlink highway of a digital subscriber includes one channel of 8-bit audio signals B1 to B8, 8-bit data B1 to B8, and 2-bit control data D1 and D2.

Since all the above data and signals are assigned to the internal time slots of each channel,
It becomes possible to accommodate the voice signal and the control signal on the primary side of the concentrator switch 61 without distinguishing between them. The line concentration switch 61 controls each internal time slot (69kb/s)
Switching every time.

Returning to FIG. 1, the operation of the line concentrator will be explained. The line processor (LPR) 68 recognizes in advance as station information whether the terminal connected to each subscriber line 2 is an analog terminal device 4a, a digital terminal device 4b, or an idle state. From this line processor (LPR) 68,
The control information is sent to the line control memory (LCM) 66, and the line control memory (LCM) 66 then switches to the line concentrator switch (LTSW) 61.
The scanning signal from the analog subscriber terminal 4a is stored in the scanning memory 64, the distribution signal from the signal distribution memory 65 is sent to the analog subscriber terminal, and the control data from the digital subscriber terminal is D1 and D2 are sent to the D-channel processor 63, and the signals from the D-channel processor 63 are sent to the digital subscriber terminal 4b. In addition, the line concentration switch 61 is
Under switching control by the line control memory (LCM) 66, in response to a call from the analog subscriber terminal device 4a or the digital subscriber terminal device 4b, 64 kb/s audio signals B1 to B
8, B1 to B8, and data B1 to B
8 to network interface (NWIF) 62
send to

The network interface (NWIF) 62 receives audio signals B1 to B8 from analog subscribers,
Signals B1-8, B1 from digital subscribers
8, D1, and D2 are connected to the network 70 in response to a subscriber's call. The ratio of the number of channels to the network 70 and the number of channels of accommodated subscribers is the concentration ratio.

The D-channel signal processor 63 converts the signals D1 and D2 on the digital subscriber line into LAP-D.
Perform multiple processing using protocols such as The channels of signals D1 and D2 on the digital subscriber line and the processor 63 are semi-fixedly connected, and the connection is maintained unless the digital subscriber terminal device 4b moves.

The control signals SCN _a to SCN _b on the highway for analog subscribers are written in the scanning memory 64 at regular intervals. For example, if the signal indicating the subscriber's on-hook or off-hook is SCN _a , then SCN _a
The line processor (LPR) 68 detects the on-hook or post-on-hook processing of the subscriber.
8.

The signal distribution memory 65 is configured to transmit a call to the analog subscriber terminal device 4a when the analog subscriber terminal device 4a receives a call.
The ring for ringing the bell periodically sends out a sending signal under the control of the line processor 68.

The scanning memory 64 and the signal distribution memory 65 also include
It is fixedly connected to the signals SCN _a to SCN _h and SD _a to SD _h on the analog subscriber line, and the connection is maintained unless the analog subscriber terminal device 4a moves.

When a subscriber terminal device is moved, etc., it is only necessary to remove the corresponding subscriber circuit from the socket 69 and insert the subscriber circuit into the required socket 69, and these tasks can also be performed using a robot. It is possible. There is no need to manually connect jumper wires as in the past. line processor 68
By knowing which subscriber terminals have moved or switched from analog to digital, the line control memory (LCM) 66 is changed, thereby switching the semi-fixed switching in the line concentrator switch (LTSW) 61.

Note that the network (NW) 70 also accommodates trunk lines 71 from other line concentrators (not shown), and 72 indicates an output trunk line.

FIG. 3 is a block diagram showing a specific example of the configuration of the line concentration switch (LTSW) 61 shown in FIG. 2. In the figure, the concentrator switch 61 includes an upstream space switch 611 and a downstream space switch 612.
It is equipped with In this example, the primary side subscriber line is
The signals are time-division multiplexed by one of the multiplexers MPX0 to MPX7 for each of the 32 subscribers and stored in the uplink space switch 611 via one of the uplink channel memories USM0 to USM7. When 32 subscribers are time-division multiplexed, n=32 in the format shown in Figure 2.
As a result, one frame consists of 1024 time slots. The upstream space switch 611, under the control of the line control memory (LCM) 66 (see FIG. 1), accommodates 512 time slots of the audio signal into the network interface (NWIF) 62 on the secondary side and performs switching. D-channel signal processors 63-1, 63-2 scanning and signal distribution memories (SCN/SD) 64(65)-1,
64 (65)-2. Network interface (NWIF) 62, D-channel signal processor 63-1, 63-2, scanning and signal distribution memory (SCN/SD) 64 (65)-1, 6
4(65)-2 respectively deliver the signals of the 512th time slot and the 1024th time slot to the downlink spatial switch 612 after performing necessary processing. Downward space switch 61
2 is line control memory (LCM) 66
Under the control of
and the corresponding demultiplexer DMPX
It is sent to the primary side (downstream) via one of 0 to 7.

In this way, the concentrator switch can accommodate data on the primary side without being aware of whether the data is from an analog subscriber terminal or a digital subscriber terminal.

〔Effect of the invention〕

As explained above, according to the present invention, by providing the subscriber circuit insertion socket in the interface section between the subscriber line and the line concentrator,
Since MDF is no longer required, complicated manual connection work is no longer required, reducing labor costs and, ultimately, equipment prices.
By eliminating this, it is possible to obtain a line concentrator that can realize miniaturization of the device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a subscriber line concentrator according to an embodiment of the present invention, FIG. 2 is a diagram showing a data format on a subscriber line, and FIG. 3 is a concrete diagram of the line concentrator switch shown in FIG. FIG. 4 is a block diagram showing a conventional line concentration system. 2... subscriber line, 3... primary side highway of concentrator switch, 4a... analog terminal device, 4b... digital terminal device, 61... concentrator switch, 69... subscriber circuit insertion socket.

Claims (1)

[Scope of Claims] 1. A line concentrator accommodating a plurality of subscriber lines, comprising: a plurality of subscriber circuit package insertion sockets 6 provided at an interface with the subscriber lines;
9; and an analog subscriber circuit package inserted into one of the subscriber circuit package insertion sockets for converting an analog signal from the subscriber line into a digital signal in a predetermined data format corresponding to the analog signal; a digital subscriber circuit package that is inserted into one of the subscriber circuit package insertion sockets and converts a digital signal from the subscriber line into a digital signal of a predetermined data format corresponding to the digital signal; a processor 66 for identifying whether the subscriber circuit package inserted into the circuit package insertion socket is the analog subscriber circuit package or the digital subscriber circuit package based on preset data; and based on the control of the processor, A line concentrator that switches the output of the subscriber circuit package insertion socket depending on whether the subscriber circuit package inserted into the subscriber circuit package insertion socket is the analog subscriber circuit package or the digital subscriber circuit package. switch 61; and, on the secondary side of the concentrator switch 61, a scanning memory 64 for scanning signals from the analog subscriber circuit package, and a signal distribution memory for distributing signals to the analog subscriber circuit package. 6
5 and a D-channel signal processor 63 for multiplexing signals from or to the digital subscriber circuit package, and the subscriber circuit package insertion socket 69 has a shape similar to that of an analog subscriber circuit. The processor 66 identifies whether the subscriber circuit package on the primary side of the concentrator switch 61 is an analog circuit package or a digital subscriber circuit package, and A subscriber line concentrator characterized in that the signal time slots of the digital subscriber circuit package are semi-permanently switched to the scanning memory 64 and the signal distribution memory 65, and the signal time slots of the digital subscriber circuit package are switched to the D-channel signal processor 63.