JPH02127895A - Subscriber line signal processing system - Google Patents

Abstract

PURPOSE:To save the cost of a signal transmission line and to attain effective utilization by using a data transmission line subjected to line concentration through the arrangement of a line concentration multiplex distributer to a data link from a subscriber line to a signal device. CONSTITUTION:An exchange system 100 consists of a line concentration stage 140 accommodating subscriber lines 2-1-2-m and a distribution stage 150 connecting between the line concentration stages 140 and between the line concentration stage 140 and a relay line, and exchange terminators 30-1-30-m accommodate each of m-lines of subscriber lines 2-1-2-m terminating the subscriber terminal equipment and connect them to the line concentration stage 140. The line concentration stage 140 consists of the line concentration switch 141 connecting a channel and a multi-line multiplex distributer 144 connecting the signal line. A distribution stage 150 consists of a distribution stage switch 151 connecting a channel, signal devices 152-1-152-m for the subscriber line signal, a controller 153 and a line concentration multiplex distributer 154 connecting the signal line to the signal devices 152-1-152-m. Thus, the cost of the transmission line is saved and the transmission line is effectively used.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a concentrator stage that accommodates subscriber lines terminating subscriber terminals via a switching termination device, a concentrator stage between the concentrator stages, and a concentrator stage and a trunk line. and a distribution stage that provides a connection between the subscriber terminal and the subscriber line signaling equipment of the distribution stage via a switching termination equipment, and transmits digital subscriber signals specified in CCITT Recommendation I, 440. This invention relates to subscriber line signal processing methods for switching systems using

[Conventional technology]

During the transition period when the switching system that accommodates scattered ISDN terminals via small-scale remote subscriber concentration stage slave stations to the distribution stage master station is transitioning from existing networks such as telephone networks and packet networks to ISDN. can reduce initial capital investment costs.

This type of conventional subscriber line signal processing method connects a data transmission line to the subscriber line signaling device in the distribution stage of the switching system for each switching termination device that accommodates and connects subscriber lines, and processes digital subscriber line signals. It was being transmitted and processed.

The prior art will be explained below using FIG. 3.

FIG. 3 is a block diagram showing an example of a conventional system expressed by space division for easy understanding. In FIG. 3, exchange termination devices 30-1 to 30-m accommodate and connect m subscriber lines 2-1 to 2-m, respectively, which terminate subscriber terminals.
Connect to the switch of the exchange system 200. In addition, the switching terminal devices 30-1 to 30-m are data transmission lines 1-1.
1-m to each of the signal devices 152-1 to 152-m on a one-to-one basis, and transmits and receives digital subscriber line signals.

[Problem to be solved by the invention]

In the conventional subscriber line signal processing method described above, the switching termination equipment connected to the concentrator stage and the signal equipment installed in the distribution stage are directly connected by a data transmission line corresponding to the subscriber line. If the distance between the distribution stage and the distribution stage is long, the transmission line cost will increase, and the digital subscriber line signaling system has the disadvantage that the data transmission traffic is not so high, so the transmission line cannot be used effectively. was.

SUMMARY OF THE INVENTION An object of the present invention is to provide a subscriber line signal processing system that solves the above-mentioned drawbacks by integrating transmission lines.

[Means to solve the problem]

The subscriber line signal processing method of the present invention provides a distribution stage for accommodating subscriber lines terminating subscriber terminals via a switching termination device, and a distribution stage for connecting between the concentrating stage and between the concentrating stage and the trunk line. between the subscriber terminal and the subscriber line signaling device of the distribution stage via the switching termination device.
TT Recommendation■.

In the subscriber line signal processing method of a switching system using digital subscriber line signals specified in CCITT Recommendation I, 440, data transmission lines are concentrated by being arranged in each of the concentration stage and the distribution stage, and as specified in CCITT Recommendation I, 440. It has a line multiplexing and distribution device that transmits and receives the invalid frames as line multiplexing and distribution information.

〔Example〕

Next, the subscriber line signal processing system of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, the switching system 100 includes a concentrator stage 140 that accommodates subscriber lines 2;
- A distribution stage 150 that connects the trunk lines, and each of the exchange termination devices 30-1 to 30-m connects each of the subscriber lines 2-1 to 2-m of m lines terminating the subscriber terminals. It is accommodated and connected to the concentrator stage 140. The concentrator stage 140 includes a concentrator switch 141 that connects communication paths and a concentrator multiplexer 144 that connects signal paths. The distribution stage 150 includes a distribution stage switch 151 that connects communication paths, signal devices 152-1 to 152-m for subscriber line signals, a control device 153, and a concentrator multiplex distribution device 154 that connects signal paths to the signal devices 152- to 152-m. have

The n-line data transmission lines 1-1 to -n connecting the line concentration multiplex distribution bags W144 and 154 are the m-line subscriber lines 2-1 to -n.
- for m, n/m = 1/8 to 1/32
The lines are concentrated with a reduction degree of .

A subscriber signal concentrator, multiplexer and distributor will be described below.

The line concentrator/distributor 144 monitors the flags of the subscriber line signal received from one of the exchange termination devices 301 to -m, for example, line m, and detects the start flag and end flag, thereby identifying the subscription surrounded by the flags. detects the signal block on the main line,
Temporarily memorize the meeting point. When the termination flag is detected, this stored information and the destination information of the subscriber line signal block (eg, designation information of the signaling device 152-m) are edited as invalid frame information of 5 octets or less. Next, the line concentrator multiplexer/distributor selects one free line, for example, line n, from among the data transmission lines 1-1 to -n, and uses this selected line n to send destination information in an invalid frame of 5 octets or less. . The line concentrator multiplexer 154 in the distribution stage 150 of the connection destination extracts the destination information from the information of the invalid frame of 5 octets or less and transfers it to lines n and 152 of the data transmission lines 1-1 to -n.
-1 to -m are connected, and a connection completion signal is sent to the line concentrator multiplexer 144 in the line concentrator 140 using an invalid frame of 5 octets or less to the subscriber line that was waiting. The signal block is transmitted via the selected data line 1-n to the signaling device 152-m.

Conversely, when transmitting a heterodigital subscriber line signal from the signal device 152-m to the switching termination device 30m, the above signal flow is performed in reverse.
54 will be explained.

FIG. 2 is a detailed block diagram showing an example of the line concentrator, multiplexer, and distributor of FIG. 1. As shown in FIG. 2, a code pattern (for example, all 1's, or a flag pattern) indicating an empty state in which no data is being sent is distributed to switching terminal equipment and signaling equipment that are not connected to the data transmission line.

In FIG. 2, the output of a pattern generator 156 for generating a code pattern is distributed via a switch matrix 157 to signal devices 152-3 and 152-3. The same applies to the line concentrator multiplexer/distributor 144.

Therefore, even though the number of data transmission and reception lines is limited to n lines, it can be made to appear equivalent to having an m-line exchange concentrator and an m-line signaling device, or a 1:1 arrangement of data transmission and reception lines. That is, for the number of data rings m (m integer) between the exchange termination equipment and the signaling equipment, n data transmission lines (n is an integer equal to m) are provided, and subscriber line signal blocks are detected by flag monitoring. A transmitting/receiving means that waits for line concentration through a data transmission line, and transmits and receives data blocks via a data transmission line, and a line concentrator that transmits and receives data block concentration information using invalid frames of 5 octets or less, and concentrates and distributes subscriber line signal blocks. A concentrating multiplexing and distributing device is provided which has pattern distributing means for distributing a predetermined code pattern to the multiplexing and distributing means, as well as the exchange termination equipment and the exchange side signaling equipment that are not connected to the data transmission line.

Here, the data transmission line can be concentrated to 10 nm/m, and the transmission line cost can be reduced, and 07 m can be reduced to 1/8 to 1/32. In addition, since the line concentrator/distributor only monitors the flags and does not check the contents of the data surrounded by the flags, it can be easily realized with a simple circuit, has a shallow logic depth, and can be realized economically at low cost.

〔Effect of the invention〕

As explained above, the subscriber line signal processing method of the present invention is
By arranging a concentrator, multiplexer, and distributor for the data link from the subscriber line to the signal equipment and using a data transmission line, it is possible to reduce the cost of the signal transmission line and make effective use of it.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the subscriber signal processing system of the present invention, FIG. 2 is a block diagram showing an example of partial details of FIG. 1, and FIG. 3 is a block diagram showing an example of the conventional system. be. 1...Data transmission line, 2...Subscriber line, 30...
・Exchange terminal device, 100...exchange system, 140・
... Line concentration stage, 141... Line concentration switch, 144, 15
4... Concentrator multiplex distribution device, 150... Distribution stage, 15
1... Distribution stage switch, 152... Signal device, 15
6... Pattern generator, 157... Switch matrix. Graduation drawing

Claims (1)

[Claims] It is composed of a concentration stage for accommodating subscriber lines terminating subscriber terminals via exchange termination equipment, and a distribution stage for connecting between this concentration stage and between the concentration stage and trunk lines, In a subscriber line signal processing method for a switching system that uses digital subscriber line signals specified in CCITT Recommendation I, 440 between a subscriber line signal device in a distribution stage and a subscriber line signal device in a distribution stage via a switching termination device, It is installed in each distribution stage to concentrate data transmission lines, and
A subscriber line signal processing system characterized by having a line multiplex distribution device that transmits and receives invalid frames defined in CITT Recommendation I, 440 as line multiplex distribution information.