JPH0514984A - Line processing unit control system - Google Patents

Abstract

PURPOSE:To attain the control of the line processing unit from an exchange system independently of the installing location of the line processing unit by sharing a control information path of various line processing units in common in the exchange system accommodating an inter-station line so as to simplify the hardware of the exchange system. CONSTITUTION:A control signal S1 is transferred by using bits A-D on a specific time slot on a same transmission highway path VI in compliance with the CCITT recommendations Q.50 ANNEX A and various line processing units are controlled unifiedly by using the same transmission highway path VI in the case of controlling the various line processing units such as a digital line multiplexer 1 on a line, an echo canceller 3a and an A/mu converter 3b in an exchange system 4 accommodating an inter-station line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for a line processing device on a line in a switching system accommodating an interoffice line.

[0002]

2. Description of the Related Art A conventional technique in this field is shown in FIG. In the figure, 1 is a digital circuit multiplexer (Digital Cipher).
rcuit Multiplication Equipment, abbreviated as "DCME" hereinafter), 2 is a transmission synchronization terminal equipment, 3 is an echo canceller device composed of an echo canceller 3a, A / μ converter 3b, etc., 4 is an exchange that handles various communication types. system,
4a and 4b are the DCME control unit and the echo canceller device control unit in the switching system 4 corresponding to the DCME control transmission highway path III and the echo canceller device control path IV, respectively, and Ia to Id are the DCME 1 and the transmission synchronization terminal equipment 2. , II is a transmission highway between the transmission synchronization terminal equipment 2 and the echo canceller device 3, and III is DCME between the echo canceller device 3 and the switching system 4.
A control transmission highway path, IV is a control path for controlling the echo canceller device 3 between the echo canceller device 3 and the switching system 4, and V is a transmission path to the outside that is input to or output from the DCME 1.

As shown in FIG. 4, in the conventional line processor control system, the International Telegraph and Telephone Advisory Committee (hereinafter referred to as "C
It is necessary to separately set the control information path IV for the echo canceller device 3 including the echo canceller 3a, the A / μ converter 3b, etc. in addition to the DCME1 control path III defined by the recommendation). there were.

[0004]

In the conventional line processor control system as described above, the DC is provided inside the switching system 4.
Since it is necessary to have an independent control function corresponding to each control path such as the ME1 control path III and the echo canceller device 3 control path IV, the configuration of the exchange system 4 becomes complicated and its hardware scale becomes large. There was a problem of increasing.

[0005]

The above-mentioned problems can be solved by the present invention by adopting the following novel characteristic construction system. That is, the feature of the present invention is that CCITT Recommendation Q is used when controlling various line processing devices such as a digital line multiplexer, an echo canceller, an A / μ converter on the line in a switching system accommodating an interoffice line. ． 50 ANE
A line processing device control method in which a control signal is transferred by using a bit on a specific time slot on the same transmission line conforming to XA, and the various line processing devices are uniformly controlled using the same transmission line. Is.

[0006]

According to the present invention, by adopting the above-mentioned method, the unified control unit provided in the switching system uses the bits on the specific time slot on the same transmission line to make a unified system for various line processing devices. Since a control signal is transmitted and various line processing devices are controlled by the transmission signal, it is not necessary to provide a transmission control path or a control function in the switching system for each line processing device as in the conventional case.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the method of the present invention will be described with reference to the drawings. FIG. 1 shows an example of the configuration and connection to which this embodiment is applied, and FIG. 2 shows the same 2 megabit / s transmission line time slot 16
FIG. 3 is a table showing the frame format of the equivalent signal, and the configuration of the C and D bits allocated for controlling the echo canceller device. In the figure, 4c is a unified control unit of the DCME 1 and the echo canceller device 3 provided in the switching system 4, and VI is a unified transmission highway path for controlling the DCME and echo canceller device. The same elements as those of the conventional one are designated by the same reference numerals.

This embodiment will be described with reference to FIG. Figure 1
In the above, the exchange system 4 is an exchange system that handles various communication types, and depending on the communication type from the user, the DCM
When controlling the line processing devices such as the E1 and the echo canceller device 3, the switching highway VI (8.4) corresponding to the 2 megabit / s transmission line time slot 16 from the switching system 4 is used.
The control signal S1 is transferred onto the time slots 67 to 70 of megabit / s). The echo canceller device 3 controls the enable / disable of the echo canceller 3a and the A / μ converter 3b by using the signal related to the own device in the transferred control signal S1. Further, the control signal S1 is transparently transferred from the transmission highway II (8.4 megabit / s) to the transmission synchronous terminal equipment 2, and the transmission lines Ia to Id are transmitted.
It is transferred to DCME1 via (2 megabit / s). D
Similar to the echo canceller device 3, the CME 1 uses signals related to its own device to perform control such as capture of a transmission line according to various communication types requested by a user.

The format of FIG. 2 is CCITT recommended Q.264 as bits on a specific time slot adopted by this embodiment. It is the same as the frame format for DCME control shown in 50 ANNEX A. First, an outline of this frame format will be described. In the frame format shown in FIG. 2, the time slot 16 has 2 megabytes.
Bit / s 16 frames form one multi-frame, frame 0 multi-frame sync signal (bits B1 to B4 are all "0") and bearer resource status information and maintenance information in units of 2 megabit / s (30 channels) , And bearer setting / release information and transmission path failure information (control bits: A, B, C, D) are transferred in frames 1 to 15. According to CCITT recommendation, A is used for DCME control.
Since two bits of B, C, or D are used, in the present embodiment, the A and B bits are CCIT.
The C and D bits are assigned to the control of the echo canceller device 3 for the DCME1 control based on the T recommendation.

Next, the details of the A, B and C, D bits allocated for controlling each device will be described. As described above, the A, B bits allocated for the DCME1 control are CCI.
The description is omitted because it complies with the TT recommendation. In FIG. 3, in the signal S1 from the switching system 4 to the echo canceller device 3, C bit “0” is enable of the echo canceller 3a, “1” is disable,
"0" of D bit is disable of A / μ converter 3b,
"1" is associated with the enabled state, and logically there is a combination of C bit = "0" (echo canceller 3a = enable) and D bit = "0" (A / μ converter 3b = disable). Therefore, it is possible to prevent the generation of the "00" bit associated with the pseudo sync signal. Similarly, as a signal from the echo canceller device 3 to the switching system 4, an alarm (abnormal) state is displayed in [C, D bits = "01" or "10"] and an echo canceller is displayed in [C, D bits = "11"]. Signals representing the normal state of 3a and the A / μ converter 3b are assigned and [C, D bits = "00"] are unused to prevent the generation of pseudo sync signals.

[0011]

As described above, according to the method of the present invention, the DCME and the echo canceller connected on the line,
The control path of the echo canceller device including the A / μ converter can be shared, and the data path for control signal transfer of various line processing devices connected to the switching system and the line to be controlled are on the same transmission line. It is not necessary to set a new data path, the line processing device can be controlled from the switching system without being affected by the installation location of the line processing device, and the hardware configuration of the switching system is simplified. Demonstrate usefulness.

[Brief description of drawings]

FIG. 1 is a connection example of a line processing device to which an embodiment of the system of the present invention is applied.

FIG. 2 is a frame format of a signal corresponding to a 2 megabits / s transmission path time slot 16 in the control method according to the above.

FIG. 3 is a table showing a configuration of C and D bits allocated for controlling the echo canceller device in the above.

FIG. 4 is a connection configuration example of a conventional line processing device control system.

[Explanation of symbols]

1 ... DCME 2 ... Transmission synchronous terminal equipment 3 ... Echo canceller device 3a ... Echo canceller 3b ... A / .mu. Converter 4 ... Switching system 4a ... DCME control unit 4b ... Echo canceller device control unit 4c ... DCME / echo canceller device control Parts Ia to Id ... Transmission line between DCME and transmission synchronization terminal equipment II ... Transmission highway path III between transmission synchronization terminal equipment and echo canceller device ... Transmission highway path IV for DCME control ... Echo canceller device control Path V ... Transmission path VI / DCM for input / output to / from the outside VI ... Transmission highway path for controlling DCME and echo canceller device

Claims (1)

Claim: What is claimed is: 1. A switching system accommodating an interoffice line, wherein a digital line multiplexer, an echo canceller, A /
When controlling various line processing devices such as μ converters, CCITT Recommendation Q. A line characterized in that the control signal is transferred using bits on a specific time slot on the same transmission line conforming to 50 ANNEX A, and the various line processing devices are uniformly controlled using the same transmission line. Processor control system