JP2504280B2 - Unused channel effective utilization method of digital exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention effectively utilizes an unused channel of a digital exchange for effectively utilizing an unused channel of a digital exchange connected to a time division multiplexer in an international line. It is related to the method.

[Conventional technology]

An example of a conventional multiplexing device in an international line will be described with reference to FIG.

In the figure, 1 is a digital exchange, 2 is an exchange interface unit (hereinafter, abbreviated as EXIF) for connecting to the digital exchange 1, and 3 is for inputting and outputting a voice code string converted to TTL level by EXIF2. An exchange bus (hereinafter abbreviated as EX bus), 4 is a companding section for companding a corresponding channel of a voice code string on the EX bus 3, and 5 is input / output of data companded by the companding section 4. Is a multiplexing bus, 6 is a multiplexing unit for multiplexing and separating the data on the multiplexing bus 5 and inputting / outputting to / from a line, 7 is an international line, and the multiplexing unit 6 is connected to the international line 7. There is. In addition, (A) shows a multiplexer.

 Next, the operation will be described.

First, various standards output from the digital exchange 1, for example, a digital voice code string satisfying TTC is level-converted to a TTL level by EXIF2 and sent to the EX bus 3. Then, the corresponding used channels of the frame format of the digital voice code sequence on the EX bus 3 are compressed by the companding unit 4 corresponding to each channel, and the multiplexed bus 5 is used.
Is input to the multiplexing unit 6 via. The multiplexing unit 6 multiplexes the compressed audio data, performs level conversion suitable for the international line 7, and sends the data to the international line 7.

Next, when the data is input from the international line 7 to the multiplexing unit 6, the level of the data on the international line 7 is converted by the multiplexing unit 6 by the route reverse to the above, and the data is sent to the multiplexing bus 5.
The companding unit 4 expands the compressed data corresponding to each channel and sends it to the EX bus 3. And EX with EXIF2
The data on the bus 3 is fetched, converted into a level suitable for the digital exchange 1, and sent to the digital exchange 1.

[Problems to be Solved by the Invention]

Considering the frequency of use and line usage fees, the line capacity cannot support all the channels on the frame format of the digital exchange, considering the frequency of use and line usage charges. Even if a line is used, it is necessary to install a set of device configurations similar to those described above, and there are problems such as an increase in unused channels on the frame format of the digital exchange, resulting in an expensive device configuration.

The present invention has been made to solve such problems.
It is an object of the present invention to obtain an unused channel effective utilization method of a digital exchange, which can reduce the number of used lines of the digital exchange and has an inexpensive device configuration.

[Means for solving the problem]

An unused channel effective utilization system of a digital exchange according to the present invention is provided with first and second multiplexing units which are respectively connected to first and second international lines and multiplex digital voice signals, and first and second multiplexing units. First and second exchange interface units for connecting the multiplexing units to the digital exchanges, respectively, and a digital signal which is connected between the first multiplexing unit and the first exchange interface unit and is input to and output from the digital exchange. A first companding unit for companding a voice signal, and a second companding unit for companding a digital voice signal input / output to / from a digital exchange, which is connected between the second multiplexing unit and the second exchange interface unit. It is connected between the companding unit, the connection point between the first exchange interface unit and the first companding unit, and the second exchange interface unit, and is a connection point on the exchange bus on the exchange bus of the digital exchange. It is made and an unused channel re-editing unit for re-editing the unused channel in-time format.

Also, first and second line interface units connected to the first and second international lines, an exchange interface unit for connecting the first and second line interface units to a digital exchange, and a first A first companding unit connected between the line interface unit and the exchange interface unit for companding a digital voice signal input to and output from the digital exchange, and connected between the second line interface unit and the exchange interface unit. A second companding unit for companding a digital voice signal that is input to and output from the digital exchange, and is connected between the first and second line interface units and the first and second companding units. Any one of a first multiplexer including a companding unit 1 and a first line interface unit and a second multiplexer including a second companding unit and a second line interface unit It is made and an unused channel distributor for distributing the unused voice channels in the other one of the multiplexing apparatus in the multiplexer.

[Action]

In the present invention, since the unused channel is re-edited and supplied to the exchange interface of another multiplexer, it is not necessary to rent a circuit of the digital exchange for the other multiplexer.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an unused channel effective utilization system of a digital exchange according to the present invention.

In FIG. 1, the same reference numerals as those in FIG. 3 indicate corresponding parts, and 2 _A and 2 _B are exchange interface sections (hereinafter abbreviated as EXIF) for connecting to the digital exchange 1.
3 _A and 3 _B are exchange buses (hereinafter abbreviated as EX buses), 4 _A and 4 _B
Is a companding unit that compands the digital voice code input / output from the digital exchange 1, 5 _A and 5 _B are multiplexing buses, and 6 _A and 6 _B are multiplexing circuits connected to international lines 7 _A and 7 _B , respectively. Part, 8 is EX bus 3 _A
It is an unused channel re-editing section that re-edits the unused channels in the upper frame format.

 Note that (A) and (B) are diversification devices.

 The operation of the embodiment shown in FIG. 1 will be described below.

In the voice code stream transmitted from the digital exchange 1, one channel has 24 channels of 8 bits per channel.
There are 1.5M type frame format and 2.0M type frame format which has 30 channels of 8 bits per channel as one frame. At present, the line speed of international lines is often 128 Kb / s or less. This is because the usage fee for international lines is high and the frequency of use is low. Therefore, all channels on the frame format sent by the digital exchange 1 can be used only for a part of the support.

First, the voice code string sent from the digital exchange 1 is
After level conversion with EXIF2 _A , it is sent to EX Bus 3 _A. The channel used in the multiplexer (A) is the companding unit 4 _A.
Is compressed by the multiplexer 6, multiplexed by the multiplexer 6 _A , and output to the international line 7 _A. The unused channels in the multiplexer (A) are taken into the unused channel re-editing section 8 via the EX bus 3 _A. In this unused channel re-editing unit 8, the unused channels are rearranged in a preset order (this order depends on the used channel of the multiplexing device (B) connected to the next stage), and the same as in the digital exchange. supplied to EXIF2 _B of multiplexer (B) at the frame the format. Then, in the same procedure as the prior art shown in FIG. 3 the multiplexer (B), though the compression as if it were connected to a digital switch, multiplexes and transmits the data to the international circuits 7 _B.

Next, data is input from the international line 7 _B to multiplexer (B), separated by the same procedure as the prior art shown in FIG. 3, as if stretched, and outputs from EXIF2 _B to digital switch sends To do. Then, the unused channel re-editing unit 8 rearranges the voice code string received from the multiplexer (B) into the original channel position suitable for the EX bus 3 _A in the multiplexer (A), and EXIF2 _A Pass to. The EXIF 2 _A converts the level of the data on the EX bus 3 _A and outputs it to the digital exchange 1.

In the above embodiment, the unused channel in the frame format on the EX bus is re-edited and supplied to another multiplexer (B) by the interface similar to the line of the digital exchange. However, it can also be realized by extending the EX bus, increasing the companding unit, providing two systems of the multiplexing unit, and distributing the data string on the multiplexing bus to each multiplexing unit.

FIG. 2 is a block diagram showing another embodiment in which the data string on the multiplex bus is distributed to each multiplex section.

In FIG. 2, the same reference numerals as those in FIGS. 1 and 3 indicate corresponding parts, 4 _A and 4 _B are companding parts connected to the exchange 3 and the multiplexing bus 5, and 9 is a multiplexing part. Unused channel distributors (multiplexed data distributors) for allocating unused voice channels to other multiplexers, 10 _A and 10 _B are line interface units.

 Next, the operation of the embodiment shown in FIG. 2 will be described.

First, the voice code string output from the digital exchange 1 is
After the level conversion in EXIF2, to capture compress each relevant channel in companding unit 4 _A, 4 _B via the EX bus 3. Then, the compressed data is multiplexed by the unused channel distribution unit 9 (multiplexed data distribution unit) via the multiplexing bus 5, and the respective line interface units 10 _A , 10 _{A are connected} .
Distribute and distribute data to _B. The line interface units 10 _A and 10 _B output after level conversion to the international lines 7 _A and 7 _B connected to them.

Next, the data input from the international lines 7 _A and 7 _B are level-converted by the line interface units 10 _A and 10 _B, respectively, and collected and multiplexed in the unused channel distribution unit 9 (multiplexed data distribution unit). And sends it to the digital bus 5. Then, in the companding units 4 _A and 4 _B , the data taken in via the multiplexing bus 5 is expanded for each channel and output to the E bus 3. EXIF2 converts the level of EX bus 3 data,
It is sent to the digital exchange 1.

〔The invention's effect〕

As described above, the present invention is configured to allocate an unused channel on the frame format of a digital exchange to another multiplexing device, so that it is not necessary to rent a line of another digital exchange, and it is inexpensive and sufficient. There is an effect that it is possible to build a different system.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an unused channel effective utilization system of a digital exchange according to the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, and FIG. 3 is a conventional international line. It is a block diagram which shows an example of a multiplexer. 1 ...... digital switch, 2 ...... exchange interface section, 3,3 _A, 3 _B ...... exchange bus, 4 _A, 4 _B ...... companding unit, 6 _A, 6 _B
...... Multiplexing unit, 7 _A , 7 _B・ ・ ・ International line, 8 ・ ・ ・ Unused channel re-editing unit, 9 ・ ・ ・ Unused channel distribution unit

Claims (2)

(57) [Claims] 1. A first and a second multiplexer, each of which is connected to a first and a second international line and multiplexes a digital voice signal, and a first and a second multiplexer which are respectively connected to a digital exchange. A first and a second exchange interface unit for performing the operation, and a first voice signal connected between the first multiplexing unit and the first exchange interface unit for companding a digital voice signal input to and output from the digital exchange. And a second companding unit connected between the second multiplexing unit and the second exchange interface unit for companding a digital voice signal input / output to / from the digital exchange, Unused in the frame format on the exchange bus of the digital exchange which is connected between the connection point of the exchange interface section and the first companding section and the second exchange interface section and is the connection point. Cha Unused channel effective utilization method of a digital switching system, characterized by comprising a non-used channel re-editing unit for re-editing Le. 2. The first connected to the first and second international lines
And a second line interface section, an exchange interface section for connecting the first and second line interface sections to a digital exchange, and the digital exchange connected between the first line interface section and the exchange interface section. A first companding unit for companding a digital voice signal input / output to / from a second line interface unit and a switch interface unit, and compands a digital voice signal input / output to / from the digital exchange. And a second companding unit for connecting the first and second line interface units to the first and second companding units.
Unused voice channel in any one of the first multiplexer and the second companding unit including the line companding unit and the second companding unit including the second line interface unit An unused channel effective utilization method of a digital exchange, characterized by comprising an unused channel distribution section for distributing to either of the other multiplexers.