JPH03283735A - Multiplex system - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of a high speed relay line by increasing a voice compression rate in the occurrence of a fault or decreasing the data communication speed so as to generate a bypass band. CONSTITUTION:A network management equipment 106 bypasses a signal through a low speed line assigned to a relay line 107(108) through other high speed relay line 108(107) on the occurrence of a fault of the high speed relay line 107(108). When the bypass destination high speed relay line 108(107) has no enough band to allocate a bypass low spied line and the low speed line through the high speed relay line 108(107) is a voice line, the voice compression rate of the line is increased and when the line is a data line or a FAX terminal equipment or the like, the communication speed is lowered. Thus, the low speed line band required for the bypass communication is generated quickly to ensure the communication of the low speed line.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a multiplexing method in a multimedia multiplex system, and in particular,
When detouring low-speed line data to another high-speed relay line, data compression and communication speed of the low-speed line are dynamically changed according to the bandwidth usage rate of the detour optical high-speed relay line to ensure more communication. The present invention relates to a multiplexing method that can be used.

[Prior art] As a conventional technology regarding a multiplexing method in a line connection method using 15DN, for example, Japanese Patent Application Laid-Open No. 64-4634
A technique described in Publication No. 0 and the like is known. In this conventional technology, in order to use a high-speed relay line efficiently, the configuration information of the low-speed line is switched by specifying a time, etc. Also, when the low-speed line is detoured to another high-speed relay line, It was intended to switch to configuration information according to the location of the failure.

FIGS. 5 and 6 are diagrams for explaining a communication method using a multiplexing method according to the prior art. In Figures 5 and 6, 1
is a telephone, 2 is a data terminal, 3 is a multiplexer, and 4 is a high-speed trunk line.

In FIG. 5, a multiplexer 3 accommodates a plurality of telephones 1 and data terminals 2, and is connected to other multiplexers via a high-speed relay circuit M4. The data is multiplexed, the multiplexed data from the high-speed relay line 4 is distributed to the devices, and communication between the device towers is controlled.

In the communication system shown in FIG. 5, the multiplexing device 3 accommodates a large number of telephones, which are voice lines, during the daytime on weekdays when there is a lot of telephone use, and at night and on holidays when there is little telephone use. It is operated so that a large number of data terminals 2, which are data lines, are accommodated in the multiplexing device 3.

The conventional technology shown in FIG. 5 is capable of efficiently using the limited high-speed relay circuit [4] band through such operation.

Furthermore, in the prior art, when a failure occurs in the high-speed relay line M4 and the low-speed line is detoured to another high-speed relay line, the sixth
As shown in the figure, the configuration is configured so that the configuration information is switched depending on the location of the failure in the high-speed trunk line 4. and,
The high-speed relay line 4 is always operated with a band secured for this detour.

[Problems to be Solved by the Invention] The prior art does not take into consideration the efficient use of high-speed relay lines when a low-speed line is detoured to another high-speed relay line due to a failure in the high-speed relay line.

That is, in the conventional technology, it is necessary to always secure a bandwidth for the detoured low-speed line in the high-speed relay line as a countermeasure against temporary failures, and the detour bandwidth is not normally used. The problem is that high-speed relay lines are inefficiently used.

It is an object of the present invention to solve the problems of the prior art described above, to enable the use of high-speed trunk lines without securing the detour band during normal operation, and to enable the use of high-speed trunk lines without securing the detour band, and to prevent the need for detouring of low-speed lines due to failures, etc. It is an object of the present invention to provide a multiplexing method that makes it possible to secure a detour communication band for a detour low-speed line even in such a case, and to achieve highly efficient use of a high-speed relay line.

[Means for Solving the Problems] According to the present invention, the object is to calculate the unused bandwidth of the high-speed relay line when allocating a low-speed line for detour to a multiplexer, and to divide the bandwidth of the low-speed line for detour. If there is a detour, the signal of the low-speed line is detoured without changing the data compression rate or communication speed of the low-speed line, and if there is insufficient bandwidth, the high-speed relay is performed only during the period when the detour is necessary. This is achieved by increasing the data compression rate of the low-speed line passing through the line or lowering the communication speed to create the necessary band for the detour line, and then using this band to detour the low-speed line.

In addition, when increasing the data compression rate or decreasing the communication speed mentioned above, prioritize the low-speed line side, and increase the compression rate only as much as necessary to secure the bypass band starting from the lowest priority. The communication speed may be changed.

[Operation] When a high-speed trunk line fails, the low-speed line assigned to the trunk line is detoured via another high-speed trunk line.

At that time, if there is not enough bandwidth to allocate a detour low-speed line to the detour destination high-speed relay line, and if the low-speed line passing through the high-speed relay line is a voice line, the voice compression rate of that line is increased, and the data line Or if it is a FAX terminal etc.
Reduce the communication speed.

As a result, it is possible to quickly create a low-speed line band necessary for detour communication and secure low-speed line communication.

According to the present invention, by the above-described control, when a low-speed line passing through a high-speed relay line is a data line or a fax terminal, the communication speed of these lines is reduced, but the connection is made to the low-speed line. It is possible to continue communication by providing the terminal with a function that automatically detects the communication speed and falls back accordingly.

Additionally, in the case of voice lines, increasing the compression rate will degrade voice quality, but if 64KHz voice is converted to 32KHz,
, 16KHz, and 8KHz has been established, and it is possible to make calls by changing the compression ratio.

[Example] Hereinafter, an example of a multiplexing device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a multimedia multiplexing system according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of an audio line interface section, FIG. 3 is a flowchart explaining detour operation, and FIG. FIG. 4 is a configuration diagram of a system that allows detours to multiple high-speed relay lines. 1st
2 and 4, 100.114 is a low-speed terminal, 101.109 is a multiplexing device, 102, 113 is a low-speed line multiplexing interface unit, and 103.110.1
04.111 is high-speed line interface section, 105-1
112 is a common control unit, 107 and 108 are high-speed relay lines,
106 is a network management device, 120 is a voice line interface section, 121.122 is a selection section, 123.124.125
126 is a control unit; 127 is a telephone; 40
1 to 403 are multiplexing devices, 404 to 406 are data terminals, 407 to 410 are high-speed trunk lines, and 411 is a network management device.

An embodiment of the present invention shown in FIG. 1 includes low-speed terminals 100 and 114 such as telephones, data terminals, and FAX terminals, multimedia multiplexing devices 101 and 109, low-speed line multiplexing interface units 102 and 113, and high-speed line interfaces. section 103.110.104, ill, common control section 105,
112, high-speed relay line 107.108 and network management device 1
06.

In the system configured as described above, first, telephone voice and data from the low-speed terminals 110 and 114 are digitally multiplexed by the low-speed line multiplexing interface units 102 and 113, and then transferred to the high-speed line interface units 103 and 113.
Sent on 04, 110, 111. This high-speed interface section provides high-speed relay of digital multiplexed data.
1107 and 108 to the opposing multimedia multiplexing devices 101 and 109.

At this time, the network management device 1 determines which low-speed terminal's data should be communicated via which high-speed relay line 107, 108.
It is determined based on the configuration definition information stored in 06.

This configuration definition information is specified and created when registering the low-speed terminals 100, 114 in the system. The configuration definition information created in the second network management device 106 is transferred to the common control units 105 and 112 in each multimedia multiplexing device 101 and 109, and
2 is used to control data routing within the low-speed line interface section and the high-speed line interface section, and to control data communication via a predetermined high-speed relay line.

Next, the low-speed line multiplexing interface section 102.11.
The configuration of the audio line interface section 120 in FIG. 3 will be explained with reference to FIG.

The audio line interface section 120 includes a selection section 121.1.
22. It is composed of audio compression sections 123, 124, and 125 and a control section 126 that controls them. The audio compression units 123, 124, and 125 each have a frequency of 32 KHz and a frequency of 1
It is assumed that three types of compression are performed: 6 KHz and a ratio of 8.

The voice from the telephone 127 is digitized by the selection section 121 and sent to one of the voice compression sections 123, 124, and 125 designated by the control section 126. The audio compression units 123, 124, and 125 compress the 4e4Kh audio data input from the selection unit 121, multiplex it via the selection unit 122, and send it to one of the high-speed trunk lines 107 and 108.

The selection of the compression ratio by the control unit 126 is carried out as specified by the network management device 106 in FIG. In addition, the audio line interface units 120 shown in the figure are installed for the number of low-speed lines (the number of telephone lines).

Next, the detour processing operation in the event of a high-speed trunk line failure will be explained with reference to the flow shown in FIG.

(1) For example, if a failure occurs at the high-speed relay port [107], the high-speed relay line interface section 103.110
detects this fault and reports the fault to network management device 106. When the network management device 106 receives the failure report, it determines from the configuration definition information whether detour in the event of a failure is specified for the low-speed line 110.114 that was allocated to the high-speed relay port 1!107 where the failure occurred. Check (step 301).

(2) If a detour is specified in step 301,
Find a detour. In this example, high-speed trunk line 107
Since it is assumed that the fault has occurred, the high-speed trunk line 108 is selected (step 302).

(3) Next, the network management device 106 determines whether the high-speed trunk line 108 selected in step 302 has sufficient unused bandwidth to allocate the low-speed line for which detour is specified as determined in step 301. It is checked whether or not (step 303).

(4) In step 303, if sufficient unused bandwidth cannot be secured, create a detour bandwidth by changing the communication bandwidth for all low-speed lines connected to the high-speed relay line 108 that can compress voice or reduce the data communication speed ( Step 304).

(5) If an unused band is secured in step 303,
Alternatively, in step 304, after creating a detour band, more low-speed lines are allocated to this band. In this case, if sufficient bandwidth cannot be secured even after compressing the data in step 304, allocating as much as possible is performed (step 305).

(6) When the allocation in step 305 is completed, the network management device 106 instructs the common control unit to control each multiplexing device 101, 109 based on the newly recalculated configuration information after the detour. 105.112 (step 306).

After the above processing is completed, the communication control units 105 and 112 control the multiplexing operation of the high-speed trunk line interface unit and the low-speed line interface unit in accordance with the newly designated operation instruction. In this case, the control unit 126 switches the low-speed line interface unit, for example, the audio line interface 120, to an audio compression unit with a higher compression rate based on the new configuration information.

In the above-described embodiment of the present invention, through these operations, the low-speed terminal line passing through the high-speed trunk line 107 can be detoured to the high-speed trunk line 108 that does not have a spare band for detouring. Furthermore, in the above-mentioned embodiment, if the faulty high-speed relay port MA 107 recovers, the original configuration information is redistributed from the network management device 106, thereby making it possible to return to the original multiplexing operation. can.

FIG. 4 shows an example of a system in which a detour to a plurality of high-speed relay lines is possible when a high-speed relay line fails, and this will be described below.

The illustrated system includes multiplexing devices 401-403, data terminals 404-406, high-speed trunk lines 407-410, and a network management device 411.

In a system configured in this way, during normal operation,
It is assumed that communication between data terminals 405 and 406 is performed using three high-speed relay lines 409, 410 and 408-407.

If a line failure occurs in the high-speed relay line 410, the network management device 411 calculates a detour for the data terminal that was passing through the high-speed relay port 8410. Then, through the process of step 301 described above, a data terminal with a detour designation is selected from among the data terminals passing through the high-speed relay port M410.

Next, through the process of step 302, the high-speed relay port [41
First, the detour routes 409 and 407-408 for 0 are selected.
The detour data terminal selected in step 302 is allocated to the remaining band of the detour route selected in step 302.

As a result of this allocation, if it is possible to allocate a detour data terminal using both detour paths, the allocation is performed at the normal communication speed, and if the bandwidth is insufficient, both detour data terminals are allocated using both detour paths. A detour band is created by increasing the compression rate of audio passing through the detour and lowering the communication speed of fall-packable data terminals such as FAX terminals, and the detour data terminals are allocated to the band.

After allocating all detour data to detour routes, the network management device
Through the process of step 306, each multiplexer 401 to 4
03 to perform a multiplexing operation based on the new configuration data, and each multiplexer causes the data terminal to perform a detour operation based on the instruction.

In the above case, in the process of step 304, the audio compression for the data terminal and the fall pack for the data terminal/FAX terminal can be specified for each data terminal, rather than automatically lowering the communication band used. , it is possible to target only specified data terminals. Thereby, it is possible to maintain the communication quality of the data terminal whose communication speed should not be lowered.

In addition, when lowering the peripheral speed for each data terminal, prioritize each data terminal, and if it is necessary to lower the communication speed due to insufficient bandwidth, all detour data is It is also possible to reduce the communication speed of the data terminal by the amount until it is allocated.

On the other hand, the terminal device side transmits the data communication to the multiplexer 40.
1 to 403, and a change in communication speed is detected by the terminal device due to an out-of-synchronization, etc., and when the communication speed changes, communication is performed following the changed communication speed.

In addition, this communication speed change is displayed on the data terminal screen,
It is also possible to notify the operator using the terminal whether or not fall pack is in progress.

[Effects of the Invention] As explained above, according to the present invention, a detour band is not secured during normal operation, and when a detour becomes necessary due to a failure, the voice compression rate is increased or data communication is By lowering the speed, a detour band can be created, so it is possible to perform high-quality voice and high-speed data communication with a low compression ratio during normal times. Although the present invention temporarily lowers the voice quality and lowers the data communication speed only in the event of a failure, it is not necessary to always reserve a detour band in the high-speed relay circuit, and it is highly efficient. High-speed relay lines can be used.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a multimedia multiplexing system according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of an audio line interface section, FIG. 3 is a flowchart explaining detour operation, and FIG. FIG. 4 is a block diagram of a system that allows detours to a plurality of high-speed relay lines, and FIGS. 5 and 6 are diagrams for explaining a communication method using a multiplexing method according to the prior art. 1...Telephone, 2...Data terminal, 3
...Multiplexing device, 4...High speed relay line, 10(), 114...Low speed terminal, 101.109.
...Multiplexing device, 102.113...Low-speed line multiplexing interface section, 103.110,10
4. Ill...High speed line interface section, 1
05.112...Common control unit, 107.108
. . . High-speed relay line, 106 . . . Network management device, 120 . . . Voice line interface unit,
121.122...Selection section, 123.124.125
. . . Audio compression section, 126 . . . Control section,
127...Telephone, 401-403...
- Multiplexing device, 404-406... Data terminal, 407-410... High-speed relay line, 411...
...Network management device. 01 ¥1 Figure 102.113: Doctor X! LA line multi-electrification interface I
A λ section 103.110, 104. II+ Expressway Exit 1 East I>Turf Ace Section 105, + 12. : Air flow system Otp up + 07108 Hatakerenchusamaroken 106 M@Arrival I! Gifu 20 Figure 2 120: f voice mouth line interface @p +21. +22: Selection tK part +23-+25: Sound P/I elephant premonition β 126: Controlled chord β I27: Telephone 401-403: 3-layer Ihi 1f 404-406゛Data Narume 407-41o: High-speed relay line 411 :Network management device

Claims (1)

[Claims] 1. In a multimedia multiplexing system that multiplexes low-speed line data from various low-speed terminals and transmits and receives this multiplexed data via a high-speed relay line, due to a failure in the high-speed relay line, the low-speed line data When detouring to another high-speed relay line, compress the data on the low-speed line passing through that high-speed relay line or change the communication speed depending on the data usage rate of the high-speed relay line to be detoured. Characteristic multiplexing method. 2. The multiplexing of the low-speed line data includes a low-speed line interface section that synchronizes and digitizes data from the low-speed line, and a data multiplexing section that multiplexes the data from the low-speed line interface section. and a high-speed relay line interface unit for transmitting the data to another data multiplexer via a high-speed relay line. The multiplexing method described in Section 1.