JPS6256096A - Line concentration device for subscriber - Google Patents

Abstract

PURPOSE:To make unnecessary a main wiring board by providing a common subscriber circuit inserting socket for an analog subscriber and a digital subscrib er at an interface part with a subsriber's line. CONSTITUTION:A line concentration device 60 is equipped with a line concentration switch 61 and a network interface 62, a D-channel signal processor 63, a scanning memory 64, a signal distribution memory 65 and a line control memory 66 connected to the switch 61, and a line processor 68 connected to these devices 63-66 through a bus 67. Furthermore, at the interface part with a subscriber's line 2, subscriber circuit inserting sockets 69 are provided respectively corresponding to plural subscriber's lines 2. When a terminal unit connected to the subscriber's line 2 is an analog terminal 4a, the package of an analog subscriber's circuit is inserted to a corresponding subscriber circuit inserting socket 69 and when it is a digital terminal 4b, the package of a digital subscriber's circuit is inserted to the corresponding subscriber circuit inserting socket 69.

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 at the interface with the subscriber line, and the subscriber terminal A package for an analog subscriber circuit or a digital subscriber circuit is inserted into the socket depending on whether the device is an analog terminal device or a digital terminal device, and the output signal from the socket is accommodated in a concentrator switch without distinction 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 particularly to a main distribution frame (MDF).
) and eliminates the need for jumper wire connection work.

[Conventional technology]

A conventional subscriber line concentration system is shown in FIG. In FIG. 4, an algebraic subscriber line 2 bundled with a subscriber gaple 1 is accommodated at one end of an MDF 3. The other end of the subscriber line 2 is connected to an analog subscriber terminal 4f or a digital subscriber terminal 4b, or is vacant when no subscriber is present. The analog subscriber line 5a connected to the other end of the MDF 3 is accommodated 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. Digital subscriber line 71 fixedly provided in 6
] is housed in.

Within MnF3, service ordering functions associated with line concentration, traffic balance, movement of subscribers such as moving, or switching from analog terminal equipment to digital terminal equipment by subscribers are performed between subscriber line 2 and analog or digital terminal equipment. This is realized by connecting the jumper wire 8 to the subscriber line 5a or 5b.

[Problems to be solved by the invention] According to the above-mentioned conventional method, the jumper wire connection work is performed manually, which requires dedicated personnel for this connection work, resulting in high labor costs. There is a point. Another problem is that the MDF cannot be made smaller because the wiring work is done manually.

[Means for solving problems]

In order to solve the second problem, what is provided by the present invention is explained with reference to FIG. It has a subscriber circuit insertion socket 69 provided in the socket, and a line concentration switch 61 connected to the output terminal of the socket. Furthermore, a subscriber circuit insertion socket 6
The shape and logical interface of 9 are made common for analog subscribers and digital subscribers, and the subscriber circuit is changed depending on whether the subscriber terminal device connected to the subscriber line is an analog terminal device 4a or a digital terminal device 4b. Analog subscriber circuit or subscriber circuit insertion socket 6 into insertion socket 69
The output signal from the terminal W4b is received on the primary side of the concentrator switch without distinguishing between the audio signal and control signal from the analog terminal device 4a and the data and control signal from the digital terminal device W4b.

[For production]

By providing a subscriber circuit insertion socket with a common shape and logical interface for analog and digital subscribers at the interface with the subscriber line in the line concentrator, it is easy to move subscribers. All you have to do is simply replace the subscriber circuit package, and the MD
F becomes unnecessary.

〔Example〕

FIG. 1 is a block diagram showing a subscriber line concentrator according to an embodiment of the present invention. In FIG. 1, the line concentrator 60 is
A line concentration switch 61, a network interface (NWIF) 62 connected thereto, a D-channel signal processor 63, a scanning memory 64, a signal distribution memory 65,
and line control memory (LCM) 66,
A line processor (LPR) 6B is connected to these devices 63 to 66 via a bus 67, and a plurality of subscriber circuit insertion sockets 69 are provided at the interface with the subscriber line 2. These lines are provided corresponding to the traffic lines 2, respectively.

If the terminal device connected to the subscriber line 2 is an analog terminal device 4a, the corresponding subscriber circuit insertion socket 69
In the case of the digital terminal device 4b, insert the puff cage of the digital subscriber circuit into the corresponding subscriber 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 accommodated on the primary side of the concentrator switch 61 without distinguishing between the audio signal and control data from the analog terminal device 4a and the data and control signal from the digital terminal device 4b. Ru.

FIG. 2 shows the data format on the subscriber line 2.

As shown in FIG. 2 fa), one frame of data and signals on the subscriber line 2 is transmitted in 125 μs, and each frame is transmitted in a data format consisting of n channels. One subscriber terminal's data and signals are inserted into each channel.

2nd edition) and fc) indicate the data format of one channel of the down highway and up highway for analog subscribers, respectively. As shown in the figure, one channel of the analog subscriber's highway includes 8-bit audio signals 81 to B8, and the lower rehabilitation station further includes eight types of distribution signals SD, ~S
D. is also included. One channel of the up highway includes audio signals 81 to B8 and eight types of scanning signals SCN and -3CNh from analog subscribers. distribution signal SD,
~SD includes a ringer signal for ringing the telephone bell, etc., and the scanning signal SCN --5CNH includes a telephone on-hook/off-hook detection signal, etc. Figure 2 (dl and (el) respectively indicate the data format of one channel of the down highway and up highway of digital subscribers. BI8 and 8-bit data F3
n1 to BI18, 2-bit control data DI,
Contains D2.

In analog subscriber lines, it is used to send 64 Kb/S distribution signals and scanning signals in addition to 64 Kb/S voice signals, and in digital subscriber lines, it is used to send 64 Kb/S distribution signals and scanning signals.
In addition to S audio signals, 64Kb/S data BIII
~BII8 and 16Kb/S control data Di,
02, one channel consists of 32 bits. All of these bits are accommodated on the primary side of the concentrator switch 61 without distinguishing between audio signals and control signals.

Returning to FIG. 1, the operation of the line concentrator will be explained. The line processor (LPR) 68E 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, and this line Processor (LPR
) 68, line control memory (LCM) 6
The line control memory (LCM) 66 sends control information to the line concentration switch 6 (LTSW) 6.
1, 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, control data DI, D2 from the digital subscriber terminal is sent to the D-channel processor 63, and the signal from the D-channel processor 63 is sent to the digital subscriber terminal. and sends it to the user terminal device 4b. The line concentration switch 61 also includes a line control memory (LCM) 6
6, in response to a call from the analog subscriber terminal device 4a or the digital subscriber terminal device 4b, 64 Kb/S audio signals 81 to B8,B
11 to BI8 and data B111 to BII8 are sent to the network interface (NWIF) 62. Network interface (NWIF) uses data 111 and 02 from digital subscriber terminals as packet information
Sometimes it is sent to 62.

The network interface (NWIF) 62 receives voice signals Bl-B8 from analog subscribers, signals Bll-8, Bnl-8, Dl, and D2 from digital subscribers, and connects them to the network in response to a subscriber's call. Connect to 70. 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 multiplexes the signal D2 on the digital subscriber line using a protocol such as LAP-D. Signal DI on digital subscriber line
, D2 and the processor 63 are semi-permanently connected, and the connection is maintained unless the digital subscriber terminal device 4b moves.

Control signals SCN, .about.SCN on the uplink highway of analog subscribers are written into the scanning memory 64 at a constant frequency. For example, if the signal indicating the subscriber's on-hook or off-hook is SCN, the line processor (!, PR) 68 detects Stl:N, and performs the necessary processing after the subscriber's on-hook or on-hook. This is performed by a line processor (LPR) 68.

The signal distribution memory 65 periodically sends out a ringer sending signal for belt ringing to the subscriber terminal device 4a under the control of the line processor 68 when a call arrives at the analog subscriber terminal bag Z4a.

The scanning memory 64 and the signal distribution memory 65 also store the signals SCN, ~SCN, and SD on the analog subscriber lines.
~SD5, and the connection is maintained unless the analog subscriber terminal device 4a moves.

If the 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 necessary socket 69, and these tasks can be performed using a robot. is also possible. There is no need to manually connect jumper wires as in the past. By knowing which subscriber terminals have moved or switched from analog to digital, line processor 68 modifies the contents of line control memory (LCM) 66, thereby concentrating the line. The semi-fixed switching in the switch (LTSW) 61 is switched.

Note that the network (NW) 70 includes other line concentrators (
A relay line 71 from (not shown) is also accommodated, and 72 indicates an output relay line.

Figure 3 shows the line concentration switch (LTSW) 61 shown in Figure 2.
FIG. 2 is a block diagram showing a specific example of the configuration. In the figure, the line concentration switch 61 includes an upstream space switch 611 and a downstream space switch 612. In this example, the subscriber line on the primary side is a multiplexer MPXO for every 32 subscribers.
- It is time-division multiplexed by any one of the MPX7s and is stored in the upstream space switch 611 via one of the uplink path memories USMO-05M7.

If 32 subscribers are time-division multiplexed, one frame will consist of 1024 time slots in the format shown in FIG. 2, where n=32. The upstream space switch 611 transfers 512 time slots of the audio signal to the secondary side network interface (NWIF) 6 under the control of the line control memory (LCM) 66 (see FIG. 1).
2 and switched 1024 time slots respectively to the D-channel signal processors 63-N and 63-2 scanning and signal distribution methods.
SCN/5D) 64 (65), 1, 64 (6
5) Store in -2. network interface (
NWIF) 62, D-channel signal input 63-
1, 63-2, Scanning and Signal Distribution Memory (SCN/
5D) 64 (65) - 1 and 64 (65) - 2 are respectively connected to the down space switch 612 after performing necessary processing.
The signals of the 12th time slot and the 1024th time slot 7 are delivered to the downlink space switch 612. Downward space switch 612, line control memory (LCM)
Under the control of 66, the signals of 1024 time slots are switched and stored in the channel memory DSMO~i)5M7.
and the corresponding demultiplexer DMPX O~
7 to the secondary side.

In this way, the concentrator switch does not need to be aware of whether the data input manually from the primary side is from an analog subscriber terminal device or a digital subscriber/terminal device.
can be accommodated.

〔Effect of the invention〕

As explained above, according to the present invention, in the concentrator,
By providing a socket for inserting the subscriber circuit in the interface between the subscriber line and the subscriber line, MDF is no longer required, eliminating the need for complicated manual connection work, reducing human rights costs, and ultimately lowering the equipment price. In addition, by eliminating the MDF, it is possible to obtain a cotton collecting device that can realize miniaturization of the device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a subscriber terminal device according to an embodiment of the present invention, FIG. 2 is a diagram showing a data format on a subscriber line, and FIG. FIG. 4 is a block diagram showing a conventional line concentration system. 2... Subscriber line, 69... Subscriber circuit insertion socket, 4a... Analog terminal device, 4b... Digital terminal device, 61... Line concentration switch.

Claims (1)

[Claims] (1) A line concentrator that accommodates multiple subscriber lines,
The subscriber circuit insertion socket (69) is equipped with a subscriber circuit insertion socket (69) provided at the interface with the subscriber line, and a line concentration switch (61) connected to the output terminal of the socket. The shape and logical interface of 69) are made common for analog subscribers and digital subscribers, and the subscriber terminal device connected to the subscriber line is either an analog terminal device (4a) or a digital terminal device (4b).
), an analog subscriber circuit or a digital subscriber circuit package is inserted into the subscriber circuit insertion socket (69) depending on the subscriber circuit insertion socket (69), and the output signal from the subscriber circuit insertion socket (69) is Terminal device (4a)
audio and control signals from digital terminal equipment (
A subscriber line concentrator characterized in that data and control signals from 4b) are accommodated on the primary side of the line concentrator switch (61) without distinction.