JP2001268036A - Duplicate switching system for voice channel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a duplicate switching system for a voice channel, which duplicates a voice channel and monitors a voice signal. SOLUTION: An insertion circuit 12 inserts a monitoring fixed pattern from a pattern generator 14 to data from a voice panel, a branch circuit 16 branches the resulting data and outputs the branched data to a couple of interface sides. On the other hand, pattern detectors 32, 34 detect the pattern of the signal from the interface sides, a discrimination circuit 35 discriminates the coincidence and a selection circuit 36 outputs the signal of the selected channel to the voice panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplex switching system, and more particularly to a duplex switching system for an audio line connected between an audio board and an interface.

[0002]

2. Description of the Related Art A conventional line switching system for connecting and communicating digital equipment such as telephones and / or workstations is disclosed in, for example, "Line Switching System" of Japanese Patent Application Laid-Open No. 62-62651. Have been.

[0003] It is necessary to improve the reliability of a communication line so that important voice data is reliably transmitted to the other party. A common technique for that is to duplicate the voice line. That is, since the probability that a failure occurs simultaneously in the duplexed voice line is low, the use of the duplexed voice line as compared with the case of using a single voice line makes it more reliable by using the normal line. It should be possible to improve the quality.

FIG. 3 is a block diagram showing a general configuration in this case. This TDM (time division multiplexing device, namely Time Div.
The voice interface unit 110 and a pair of 1.5M
Interface units 120 and 130 are provided. In this way, the audio circuit can be duplicated in the TDM device 100.

[0005]

However, in the above-described general voice line duplexing, even if a failure due to a signaling failure occurs in the multiplexing unit of the receiving unit, it cannot be monitored. The line could not be switched.
Also, when trying to determine the line state by monitoring the signaling bits in the voice line, the signaling bits are always operating, and even if the L (low level) is fixed, the determination as MB is made. There was a problem that could not be done.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a duplex switching system of a voice line which enables monitoring of signaling between stations and enables duplexing and switching.

[0007]

According to the present invention, an audio line duplex switching system transmits and receives audio signal data between an audio board and a pair of selectable interfaces. A monitoring pattern is inserted into the data to the pair of interface sides, and a pattern detector detects the data monitoring pattern from the pair of interface sides to the audio board side, and the line on the side where the pattern matches is detected. select.

Further, according to a preferred embodiment of the duplex switching system of the audio line according to the present invention, the monitoring pattern is a predetermined fixed pattern. The monitoring pattern is inserted at a predetermined 1-bit position of an arbitrary channel. The pair of interfaces is a 1.5M interface, and the monitoring pattern is inserted at a predetermined 1-bit position of an arbitrary channel. The monitoring pattern is generated by the pattern generator, inserted by the insertion circuit, and then branched by the branch circuit to a pair of interface sides. A selection circuit for selecting data from the pair of interfaces is controlled by a determination circuit that determines a match / mismatch detection result of the pair of pattern generators, and is output to the audio board side.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration and operation of a preferred embodiment of a voice line duplex switching system according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a preferred embodiment of a duplex switching system for a voice line according to the present invention. This duplex switching system for an audio line has a data converter 10 connected to an audio board side, an interface side, and an interface circuit 20 connected to the interface side. Between the data converter 10 and the interface 20, an insertion circuit (INS) 12,
Pattern generator (pattern GEN) 14, branch circuit (S
EP) 16, one pair of DROP circuits 31, 33, and corresponding pattern detectors (patterns DET) 32, 34,
A determination circuit 35 and a selection circuit 36 are provided.

The pattern generator 14 generates a monitoring fixed pattern, and the pattern generator 14 inserts the fixed pattern into data input from the audio board via the data converter 10 by the insertion circuit 12.
The insertion circuit 12 may be a well-known arbitrary circuit. The input data into which the monitoring fixed pattern is inserted by the insertion circuit 12 is divided into two by the branch circuit 16 and output to both the 1.5M interface side and the 1.5M interface side via the interface circuit 20.

On the other hand, the 1.5M interface side or the interface circuit 2 from the 1.5M interface side
Data input via 0 is branched by DROP circuits 31 and 33 and input to pattern detection circuits 32 and 34, respectively. The pattern detection circuits 32 and 34
A match / mismatch of the monitoring fixed pattern is detected. Then, the data selected by the determination circuit 35 is
6 and output to the audio board via the data converter 10. In this way, by transmitting and receiving a voice signal via a normal line without any trouble, the reliability of the voice line is improved.

FIG. 2 is a diagram for explaining the operation of the duplex switching system for voice lines shown in FIG. FIG. 2B shows 1.5M.
Indicates a frame. It is composed of 24 CHs of CH (channel) 1 to CH24. FIG. 2A is an enlarged view of CH1 in FIG. 2B. Each CH is composed of eight bits, bit 1 (b1) to bit 8 (b8). FIG. 2C shows six 1.5M frames (MF1 to MF6) shown in FIG. 2B.

The monitoring fixed pattern inserted by the pattern generator 14 in FIG. 1 through the insertion circuit 12 is shown in FIG.
As shown in (a), the eighth bit (b
8) Position. Therefore, the fixed pattern for monitoring is shown in FIG.
As shown in (c), b8 of each frame of MF1 to MF6
For example, a monitoring fixed pattern of “0” for MF1, “1” for MF2, “1” for MF3, “0” for MF4, “0” for MF5, and “1” for MF6 is inserted. This fixed pattern for monitoring corresponds to this “01100
The fixed pattern is not limited to “1” and may be any fixed pattern. Further, if necessary, this fixed pattern may be changed to another fixed pattern at an arbitrary timing.

The configuration and operation of the preferred embodiment of the voice line duplex switching system according to the present invention have been described above in detail. However, such embodiments are merely examples of the present invention and do not limit the present invention in any way. It will be readily apparent to those skilled in the art that various modifications can be made in accordance with the particular application without departing from the spirit of the invention.

[0016]

As is apparent from the above description, according to the duplex switching system of the present invention, the reliability of the voice line is improved and the pattern is generated by duplicating the transmission line through a pair of interfaces. It is possible to insert a monitoring fixed pattern by a detector and to detect a monitoring fixed pattern by a pattern detector to select a fault-free line with a matching pattern.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a preferred embodiment of a duplex switching system for a voice line according to the present invention.

FIG. 2 is an explanatory diagram of audio signal data and a monitoring fixed pattern to be inserted in the duplex switching system of the audio line of FIG. 1;

FIG. 3 is a configuration diagram of a duplex circuit of a general audio circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Data converter 12 Insertion circuit 14 Pattern generator 16 Branch circuit 20 Interface 31, 33 DROP circuit 32, 34 Pattern detector 35 Judgment circuit 36 Selection circuit

Claims (6)

[Claims] 1. A duplex switching system for an audio line for transmitting and receiving audio signal data between an audio board side and a selectable pair of interface sides, wherein data is monitored from the audio board side to the pair of interface sides. A pattern for monitoring data from the pair of interfaces to the audio board side is detected by each pattern detector, and a line on the side where the pattern matches is selected. Duplex switching method for voice line. 2. The system according to claim 1, wherein said monitoring pattern is a predetermined fixed pattern. 3. The system according to claim 1, wherein said monitoring pattern is inserted at a predetermined 1-bit position of an arbitrary channel. 4. The apparatus according to claim 1, wherein said pair of interfaces is a 1.5M interface, and said monitoring pattern is inserted at a predetermined 1-bit position of an arbitrary channel. Duplex switching method for voice lines. 5. The monitoring pattern according to claim 1, wherein said monitoring pattern is generated by a pattern generator, inserted by an insertion circuit, and then branched and output to said pair of interfaces by a branch circuit. 3. The duplex switching system for an audio line according to 3 or 4. 6. A selection circuit for selecting data from the pair of interfaces by a judgment circuit for judging a match / mismatch detection result of the pair of pattern detectors,
2. The duplex switching system for an audio line according to claim 1, wherein the audio line is output to the audio board side.