JPS62248347A - Composite switching system - Google Patents

Abstract

PURPOSE:To enable a digital sound and data to be transmitted in the same transmission line, by connecting each of the inputs/outputs of a sound switch and a data switch, to a terminal circuit forming the same transmission line, through a line interface provided at every composite terminal. CONSTITUTION:Eight bits of the digital sound by every 125mu s formed by a telephone terminal 11 are transmitted from a line interface part 13 to a line circuit 21 through a terminal line 3 following after the next frame synchronizing signal. The eight bits of the digital sound received from a sound switch 22 through a sound line 11 are also transmitted to a terminal line 13 by a line circuit 21 following after the frame synchronizing signal. Each of a line interface part 13' and the line circuit 21 which perform the transmission to the terminal lines 3 and 13, divides a received data D into a data A, and a data B at the receiving time of the frame synchronizing signal, and inserts a digital sound V, then outputs it. In this way, it is possible to connect mutually the line interface part, and the line circuit in the middle way only by performing a time/ position conversion, and the same effect as that conventional data network and telephone network are registered, can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite switching system having a voice switch for connecting telephone terminals and a data switch for connecting all data terminals.

[Conventional technology]

In the conventional composite switching system, telephone terminals that handle telephone calls with a high level of immediate response are connected to the voice switch, and data terminals that handle data transmission fees that allow waiting are connected to the data switch, making it easy to control switching connections. There is. Furthermore, in recent years, many data transmission systems have been proposed in which the address of a calling terminal is attached and packetized data packets are sent and received.

FIG. 5 is a block diagram showing a conventional example.

In FIG. 5, compound terminal 91 includes data terminal 92 and telephone terminal 93t. The data switch 94 has a data transmitting/receiving section 95, and at least one high-speed path 96 connects the data transmitting/receiving section 95. The data transmitting/receiving section 95 is installed and connected to each data terminal 92 of the composite terminal 91. Voice switch 97 is a conventional time division electronic switch that accommodates and connects telephone terminals 93. Data regarding the data terminal 92 and the data transmitting/receiving unit 95 may be transferred using, for example, a data packet having a calling terminal address and a called terminal address.
At the same time, it intercepts the data packet being transferred and extracts a packet t whose own terminal address is the called terminal address.

The data terminal 92 forms the operation t# information, for example, by operating the operation panel, into a data packet and sends it out, and also sends out the data packet on the high-speed path 96 whose own terminal is the called terminal)? It is detected and displayed on a CRT display device, for example. The data transmitting/receiving section 95 connects the high-speed path 96 and the data terminal 92 with each other.
adjust. The code transmission speed within the data network is, for example, ZO48.
Mbps.

The code transmission rate within the voice network is, for example, 64 Kbps.

[Problem that the invention seeks to solve]

As mentioned above, in the conventional composite switching system, the network that handles digital voice and the network that handles data are separated, so a telephone terminal and a data terminal are combined as a composite terminal, and a voice switch and a voice switch are used as a composite exchange. When merging a data switch with a data switch, there is rarely the problem that the terminal line connecting the composite terminal to the exchange is duplicated and becomes inconvenient. [Means for solving the problem] Complex switching system according to the present invention The main terminal has a line circuit in which the conventional voice switch and data switch human outputs are provided for each compound terminal, and is connected to a terminal line forming the same transmission path via this line circuit.

The line circuit detects digital audio from the digital code input from the terminal line and sends it to the audio switch.

The detected data packets are detected and outputted to the data switch, and the digital audio input from the audio switch and the manually generated data packet from the data switch are detected.
Output by arranging them in series on the terminal line.

One embodiment of the line circuit transmits the frame synchronization signal as a 125μ5t--frame and
8 digital audio for each line, grouped by s)
-7 frame synchronization signal and a predetermined time position relationship, and packetized data is inserted between the digital voices.

In addition, in another embodiment of the line circuit, when a predetermined digital voice insertion time arrives while a data packet is being transmitted to the terminal line, the superstition of the data packet is interrupted and digital voice is transmitted, and the transmission of the digital voice is terminated. and then transmitting the remaining data packet, and when a data packet is detected from the digital code received from the terminal line, the data packet to be transmitted to the data switch is delayed by at least the digital audio insertion time and output is started,
Digital audio? The remaining data packet after removing the pill and a series of data packets are restored and outputted by connecting them to the terminal line via the line ink 7 construction section.
The line interface section has conditions for interconnection with the above-mentioned line circuit installed at a position opposite to the terminal line.

〔Example〕

Next, the composite exchange system of the present invention will be explained with reference to the drawings.

@1 Figure is a block diagram showing one embodiment of the present invention. In FIG. 1, each of the compound terminals 10 is connected to a compound exchange 2.
0 via terminal line ■0. Complex leprosy 10 is a telephone terminal 11. data terminal center.

and a line interface section 13t. The line interface section 13 connects the compound exchange 20 and the terminal line ■◎, and connects the telephone terminal 11 and the line ■0.

Also, they are connected to the data terminal 12 through the line (phase). The composite exchange 20 has a line circuit 21. Audio switch 22. and a data switch 23. The line circuit 21 is connected to the composite terminal 10 and the terminal line ■0, the voice switch 22 and the voice line ■■, and the data switch 23.
and data line ■@Yoshi, respectively. The data switch 23 includes a data transmitting/receiving section 24 and a high-speed path 25.
has. The data transmitting/receiving section 24 is connected to one high-speed path, and the data line ■0 is connected to each line circuit 21.
◎ Next, referring to Fig. 2 and Fig. 1 together, the transmission form of digital codes in each line will be explained.

FIG. 2 is a time chart showing an example of the transmission code in FIG. In FIG. 2, the frame synchronization signal S is adopted in the terminal line (2). First, 64 Kbps digital audio transmission will be explained.

8 bits of digital audio every 125 .mu.s generated by the telephone terminal 11 is transmitted to the line circuit 21 via the terminal line (2) following the next frame synchronization signal at the line interface section 13. The line circuit 21 also transmits the 8-bit digital voice received from the voice switch 22 via the voice line Qt to the terminal line ◎ following the frame synchronization signal. The 98 bits received following the frame synchronization signal are digital audio.

Line circuit 21 and line interface section 13 are activated for transmission to voice switch 22 and telephone terminal 11, respectively.

If the terminal line is a multiplex line for a composite terminal, for example, 16-bit digital audio for two lines may be transmitted. Maf
c If you want to reduce the audio quality and increase the transmission capacity instead of sampling by 8 degrees of normal quality, use 1, for example, 4KHz.
For sampling, one frame of 250 μs may be sufficient.

Next, transmission of data packets will be explained with reference to FIGS. 2 to 4. FIG. 3 is a frame format diagram showing an example of a data packet, and FIG. 4 is a format diagram showing an example of the transmission code format on the terminal line of FIG. A 147 packet frame is identified by an 8-bit 7-lag sequence F before and after the frame. Next, an 8-bit address field, a controller C9, a data packet of, for example, 256 octets, and a 16-bit frame calibration value FC8 are sequentially formed and transmitted. The data packet typically includes a calling terminal code and a called terminal code.

In Fig. 4, one frame 125 us is the frame synchronization signal S.
frame synchronization signal 5rcF! i
An example is shown in which data D for a data packet is inserted and transmitted between 8-bit digital audio and the next frame synchronization signal S.

Terminal line■0 is, for example, the code transmission speed I in a conventional data network
I 2.048Mb part 156Mb
ps (If you have D speed, you can transfer 32 octets of packet data in 1 frame, 125 μs.
An 8 Mbps packet transmission line can be provided.

Normally, most data packets are divided into multiple frames for transmission.

Next, the division of data packets will be explained referring back to FIG. Voice is sampled at 8 KHz and converted from digital to analog, and because dialogue requires immediacy, it is sent out on the transmission path with the highest priority. In the example of FIG. 2, the frame synchronization signal and the number of multiplexed lines are clear, so the transmission timing and number of transmission bits of digital audio on the transmission path can be known.

Therefore, each of the circulation I/Toughface unit 13 and the line circuit 21 transmitting the received data D to the final round -〇〇
= i When the frame synchronization signal is received, it is divided into data DA and data DB, and the digital audio V is inserted and output. On the other hand, each of the line circuit 21 and line interface unit 13 receiving from the terminal (terminal) customer is approximately the same as the predetermined length digital audio portion inserted at the beginning of all transmissions of all received data D and DA. By delaying for a rather long time, the divided data DA and data DB can be formed into a series of data DKff and output after extracting the sidigital audio v=2.

In the above embodiment, only one high-speed path is shown in the data switch, and if the data switch has a large capacity, the high-speed paths may be multiplexed and transfer means between the high-speed paths may be provided.

The bit rate of the terminal line is even higher than that of the high-speed path, and the input/output speed at the data terminal can be adjusted by making the high-speed path a predetermined length and limiting the number of audio divisions. delay time g#L is possible).

Therefore, the line interface section and the line circuit on the way can be connected to each other only by changing the time tt, and the same effect as the conventional data network and telephone network tX can be obtained. In addition, although the digital audio insertion timing has been described as the time when the frame synchronization signal is received, if the frame synchronization signal and the predetermined timing position are present, it is possible to divide the digital audio into the digital audio, which would impair the model of this embodiment. It's not a thing.

[Effects of the Invention] As explained above, according to the uninvented composite switching system described in 5, a composite exchange connects a composite terminal including a telephone terminal and a data terminal to a terminal line that is the same transmission path for digital voice and data. A conventional telephone terminal further includes a line circuit for terminating the terminal line, and a low interface section for terminating the composite terminal at the terminal line and interconnecting the line circuit.

The advantage is that digital voice and data can be transmitted over the same transmission path without impairing the basic functions of the voice switch, data terminal, and data switch.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the composite switching system of the present invention, Fig. 2 is a time chart showing an example of transmission codes transmitted to each line shown in Fig. 1, and Fig. 3 is a data packet. FIG. 4 is a frame shape diagram showing an example of the transmission code shape on the terminal line in FIG. 1;
FIG. 5 is a block diagram showing a conventional example. 10...Multiple terminal, 11...Telephone terminal, 12...Boole m end, 1a/mountain...Line earter 7 engineering section, 20......・Switchboard, 21・River・
・Line circuit, 22・・Voice switch, 23・・・・
・・Data switch, ■, ■・・・Terminal line. Condolences WJ 2nd Figure 5 --- Frame carrier S, ■ --- Analysis digital 4
B? Yasushi 3 Figure F=--Flag Otsu-ke;su
(δ bit) Fe2---F L-4 & ε- (/6 bit throat) Hai 4 concave

Claims (3)

[Claims] (1) A composite terminal including a telephone terminal and a data terminal is terminated to form one line, and a terminal line that performs high-speed transmission of digital codes is accommodated and connected, and digital voice is exchanged with the telephone terminal via this terminal line. a line circuit that connects the voice line to the voice line and connects data packets exchanged with the data terminal via the terminal line to the data line; a voice switch that connects the voice line to each line circuit and controls exchange; a data switch that connects a data line to a high-speed path for each of the line circuits and controls data exchange by transmitting data packets to which address information of each of a calling terminal and a called terminal is added. Exchange method. (2) The line circuit transmits a frame synchronization signal every 125 μs to the digital code sent to the terminal line, and collectively transmits every 8 bits of digital audio for each line in a predetermined time positional relationship with this frame synchronization signal. 2. The composite switching system according to claim 1, wherein a data packet formed into a data packet is inserted between the digital voices. (3) When the line circuit is transmitting a data packet to the terminal line and a predetermined digital voice insertion time arrives, the line circuit interrupts the superstition of the data packet and transmits digital voice, while receiving from the terminal line. When a data packet is detected from the digital code, the data packet to be sent to the data switch is delayed by at least the digital audio insertion time and output is started, and a series of data packets is duplicated with the remaining data packet from which the digital audio has been deleted. A composite exchange system according to claims (1) and (2), characterized in that the system forms an original and outputs it.