JPH0730618A - Time-division multiplex communication system - Google Patents

Abstract

PURPOSE:To improve line use efficiency. CONSTITUTION:A voice signaling control part 12 applies a voice interface No at the transmission destination of an SS signal detected by a PBX interface part 11 and an ISDN telephone number corresponding to a voice channel No to an ISDN interface part 13. Thus, the ISDN interface part 13 sends the state of the SS signal, voice interface No and voice channel number through an ISDN network 3 to the destination of the telephone number. The ISDN interface part 13 at the telephone number destination receives data on the ISDN network 3 and from these received data, the voice signaling control part 12 decodes the voice interface No and the voice channel No and transmits an SR signal from the PBX interface part 11 corresponding to the provided voice interface No through a private branch exchange 4 to a voice terminal equipment 6 connected to the channel of the voice channel No. Thus, the SS signal is transmitted by using the ISDN network 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission system of signaling data for voice communication transmitted and received between time division multiplexers.

[0002]

2. Description of the Related Art A conventional communication system using a voice multiplexer has a structure as shown in FIG. The time division multiplexers 1-1 and 1-2 are connected by a high speed digital line 2 and an ISDN network 3. A private branch exchange 4-1 and a terminal device 5-1 such as a workstation are connected to the time division multiplexing apparatus 1-1, and similarly, the time division multiplexing apparatus 1
-2, a private branch exchange 4-2 and a terminal 5-2 such as a workstation are connected. The voice data and voice signaling data input from the private branch exchange 4-1 and the data input from the data terminal 5-1 are time-division multiplexer 1.
After being multiplexed by -1, it is transmitted to the opposing time division multiplexer 1-2 via the high speed digital line 2. Then, the time division multiplexer 1-2 decomposes the received multiplexed data into voice data, voice signaling data, and data, and then transmits the voice data and voice signaling data to the private branch exchange 4-2, and the data is the terminal device. 5-2. By the way, when the high-speed digital line 2 cannot be used due to a failure or the like, the time division multiplexers 1-1, 1-
2 is an ISDN network 3 as a bypass route for the above-mentioned data communication.
It is configured to transmit multiplexed data through.

However, the conventional communication system as described above has the following problems. Regarding voice communication, the use efficiency of the high-speed digital line 2 can be improved by the progress of voice data compression technology of the time division multiplexing apparatus. However, for voice signaling data, which originally has a small amount of data information, the merit of compression is small, and the information is required only at the time of connection / disconnection of voice communication. Since it is necessary to always reserve it for voice signaling data transmission, the capacity used for the high-speed digital line 2 is reduced by that much, which is a factor of impairing the line use efficiency. Further, the ISDN network 3 provided between the time division multiplexers 1-1 and 1-2 is used only during a period in which the high speed digital line 2 cannot be used due to a failure, and therefore is usually hardly used and is effectively used. The current situation is that there are none.

[0004]

In the conventional time division multiplex communication system as described above, in order to transmit the voice signaling data which is required as information only when the voice communication is connected or disconnected, a high speed digital signal is transmitted. Since it is necessary to always secure a communication band on the line, the transmission capacity of the high-speed digital line is reduced accordingly, and there is a drawback that the line use efficiency cannot be improved. Further, the ISDN network for communication backup when the high-speed digital line cannot be used due to a failure or the like is not used at all in normal times, and this also has a drawback that the line use efficiency is completely poor. Both of the ISDN and the ISDN network have a drawback that the line use efficiency is low and it is difficult to say that the communication system is economically excellent.

Therefore, the present invention eliminates the above-mentioned drawbacks and effectively utilizes the ISDN network that is a backup of the high-speed digital line to improve not only the ISDN network but also the line use efficiency of the high-speed digital line, and economically. Aims to provide an excellent time division multiplexing communication system.

[0006]

According to the present invention, a time-division multiplexer is connected by a high-speed digital line for transmitting multiplexed data and an ISDN network for backup in case of failure of the high-speed digital line. In the division multiplexing communication system, when voice communication is performed, voice data is transmitted using the high speed digital line, and voice signaling data is transmitted using the ISDN network.

[0007]

In the time division multiplexing communication system of the present invention,
During voice communication, voice data is transmitted using a high speed digital line. On the other hand, the voice signaling data is ISDN.
It is transmitted using the network. As a result, the ISDN network for backup, which is not normally used, can be used for voice signaling data communication, and the high-speed digital line does not need to transmit voice signaling data, and other data can be transmitted correspondingly. Therefore, the ISDN line can be transmitted. Also, the line use efficiency of the high-speed digital line can be significantly improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the time division multiplexing communication system of the present invention. Reference numeral 1 is a time-division multiplexing device for time-division multiplexing voice data, voice signaling data, normal data, etc., which is a PBX interface unit 1.
1, a voice signaling control unit 12, an ISDN interface unit 13, and a multiplexing circuit 14.
The PBX interface unit 11 detects the transmitted voice signaling data (hereinafter referred to as SS signal) by SS signal detection means 111, and the SS signal by the voice interface N.
and an SR signal notifying unit 113 for notifying the private branch exchange 4 of the received voice signaling data (hereinafter referred to as SR signal). . The voice signaling control unit 12 stores a telephone number storage unit 121 that stores the telephone number of the other party corresponding to the voice interface No. and the voice channel No., and the voice interface No. of the called party by decoding the received voice signaling data. A decoding means 122 for obtaining a voice channel No. etc. is provided. The ISDN interface section 13 is an SS signal notifying means 131 for notifying the calling means of the telephone number of the destination of the SS signal, a calling means 132 for making a call to the destination via the ISDN network 3, and a disconnecting means for disconnecting the ISDN line. 133 and receiving means 134 for receiving SS signals on the ISDN network 3.
Is equipped with. 2 is a high-speed digital line for transmitting multiplexed data, 3 is an IS for transmitting voice signaling data
A DN network, 4 is a private branch exchange for connecting a voice terminal device such as a telephone, and 6 is a voice terminal device connected to the private branch exchange 4.

Next, the operation of this embodiment will be described. When the voice terminal device 6 turns the SS signal from off to on through the private branch exchange 4 in response to the call request, the time division multiplexing device 1
SS signal detecting means 1 in the PBX interface unit 11 of
11 detects the state change of the SS signal and activates the encoding means 112. The encoding means 112 receives the input S
The state of the S signal, the voice interface No. of the other party and the voice channel No. according to a predetermined rule are shown in FIG.
The file is converted into a file as shown in, and this is output to the voice signaling control unit 12. The voice signaling control unit 12 reads the voice interface No. of the inputted file as shown in FIG. 2A and the ISDN telephone number corresponding to the voice channel No. from the telephone number storage means 121 shown in FIG. After that, the audio signaling control section 12 creates a file as shown in FIG. 2B, and this file is created by the ISDN interface section 1.
Output to 3.

The ISDN interface unit 13 is shown in FIG.
When the file as shown in (B) is received, the ISDN telephone number in the file is extracted, and this is called by the calling means 13
Give to 2. As a result, the calling means 132 sends the message to the given ISDN telephone number destination via the B channel of the ISDN network 3. After that, when the line is connected via the ISDN network 3 to a time division multiplexing device having the opposite line, the SS signal notifying means 131 changes to the SS signal state.
As shown in (B), the message formed by adding the voice interface No. and voice channel No. in the file is IS.
It is sent to the DN network 3. Up to this point, the description has been given in the case where the time division multiplexing apparatus shown in FIG. 1 is the calling side, but the operation when the time division multiplexing apparatus in FIG. 1 is the called side will be described below. To do.

When a message is transmitted through the ISDN network 3, the receiving means 134 of the ISDN interface unit 13 of the time division multiplexing apparatus 1 receives the message, and from the received message, the voice interface No., the voice channel No. Necessary information such as the status of the SS signal is extracted and a file as shown in FIG. 3 (A) is created and then output to the voice signaling control unit 12. The decoding means of the voice signaling control unit 12 is shown in FIG.
When a file as shown in (A) is received, the audio interface No. and audio channel No. in the file are decoded to create a file as shown in FIG. 3 (B), and this is created as the audio interface No. in the file. Corresponding to
S of the BX interface unit 11 (however, although only one PBX interface unit 11 is shown in the figure, there are actually only the numbers corresponding to the above-mentioned voice interface No.)
The signal is output to the R signal notifying means 113.

The SR signal notifying means 113 of the PBX interface section 11 outputs the SR signal to the private branch exchange 4 using the channel corresponding to the voice channel No. in the file received from the decoding means 122, and the decoding means. The file received from 122 is recreated as shown in FIG. 3 (B) and is output to the private branch exchange 4 using the voice channel. The private branch exchange 4 causes the voice terminal device 6 connected to the voice channel to receive the SR signal. The voice terminal device 6 receiving the SR signal transmits the SS signal as a response signal to the time division multiplexing device on the calling side by using the ISDN line connected as described above, and then the ISDN network 3 is used. Thus, transmission of voice signaling data can be realized.

Thereafter, the voice data is multiplexed with other data by using the multiplexer 14 of the time division multiplexer 1 on the calling side, and the voice data is sent out on the high speed digital line 4. The voice data multiplexed with other data on the high-speed digital line 4 is received by the time division multiplexer 1 on the receiving side, and the voice data separated by the separation circuit is the voice terminal to which the SR signal is received. It is transmitted to the device 6 via the private branch exchange 4.
Also, the ISDN interface unit 1 of the time division multiplexer 1
After completion of connection with the other party's time division multiplexer via the ISDN network 3, the disconnecting means 33 of No. 3 checks whether or not SS signal data is transmitted / received for a predetermined time, and the transmission / reception of the SS signal is recognized within this predetermined time. If not, the ISDN network 3 is disconnected to establish a line connection with the other party.

According to this embodiment, when voice data is transmitted,
Since the voice signaling data is transmitted and received via the ISDN line 3, the ISDN line 3 which is conventionally only on standby as a backup of the high-speed digital line 2 can be utilized, and the line use efficiency can be improved. In addition, since it is not necessary to send and receive voice signaling data using the high-speed digital line 2, the transmission capacity of the high-speed digital line 2 is correspondingly free, and the data transmission amount of the high-speed digital line 2 can be increased. The use efficiency can be improved. In this way, if the use efficiency of both the high-speed digital line of the system and the ISDN network 3 is improved, its economic effect can be significantly improved.

[0015]

As described above, according to the time division multiplex communication system of the present invention, by effectively utilizing the ISDN network which is a backup of the high speed digital line, ISD
Not only the N network but also the line usage efficiency of high-speed digital lines can be improved, and an economically superior system can be constructed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a time division multiplexing communication system of the present invention.

FIG. 2 is a diagram showing an example of a file created when the time division multiplexing apparatus shown in FIG. 1 becomes a calling side.

FIG. 3 is a diagram showing an example of a file created when the time division multiplexing apparatus shown in FIG. 1 becomes a receiving side.

FIG. 4 is a diagram showing an example of stored contents of a telephone number storage means in the time division multiplexing apparatus shown in FIG.

FIG. 5 is a block diagram showing an example of a conventional time division multiplexing communication system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Time division multiplexer 2 ... High-speed digital line 3 ... ISDN network 4 ... Private branch exchange 6 ... Voice terminal device 11 ... PBX interface unit 12 ... Voice signaling control unit 13 ... ISDN interface unit 14 ... Multiplexing circuit

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshiyuki Higashi 1-chome, 3-1, Asahigaoka, Hino-shi, Tokyo Incorporated company Toshiba Hino Factory (72) Inventor Yuji Sasamoto 3-1-1, Asahigaoka, Hino-shi, Tokyo Toshiba Communication Systems Engineering Co., Ltd.

Claims (1)

[Claims] 1. A time division multiplex communication system in which a time division multiplex device is connected by a high speed digital line for transmitting multiplexed data and an ISDN network for backup in case of failure of the high speed digital line, When performing voice communication,
Transmitting voice data using the high speed digital line,
A time division multiplexing communication system, wherein voice signaling data is transmitted using the ISDN network.