JPS62261299A - Control system for plural terminal equipments - Google Patents

Abstract

PURPOSE:To supervise and control plural terminals by increasing the number of the bit per line and making it into a multi-system. CONSTITUTION:For both edges of the line, terminal equipments are a telephone set and a data terminal equipment, and for both transmission and reception, one bit is respectively added to the data terminal equipment and the signal system is made into two systems. In such a case, a signal line uses SS0 and SR0 for a telephone set and uses SS1 and SR1 for a terminal equipment. The control and supervision such as the starting, etc., for setting the line are executed by the SS0 and SR0. An incoming side telephone set responds, the line cannot be communicated, thereafter, the control and supervision when the communication is executed between both data terminal equipments are executed by the SS1 and SR1. For the bit to be added, the bit is used which is not usually used including a B bit, in a primary group 30 channel (line) system PCM transmission system.

Description

Detailed Description of the Invention (A) Technical field to which the invention pertains The present invention relates to a method for monitoring and controlling lines for transmitting or exchanging voice or data, which is placed in a transmission path or exchange of a digital communication network. This is related to signal bits, and its functionality has been expanded to allow monitoring and control of multiple terminals.

(B) Prior art and problems A group of lines (24 lines in a primary group or 3
In order to perform call origination, disconnection, and other monitoring and control of each line (0 line), a signal bit (also called a monitoring signal) assigned to each line is required.

Primary group 24 channel (line) system PCM (PulseCo
In the transmission method, one bit out of eight bits for voice or data is used as a signal bit for monitoring and control every six frames, or one out of eight bits is used as a signal bit for monitoring and control.
A method is adopted in which bits are always used for signals.

In the primary group 30-channel (line) system PCM transmission system, as shown in Table 1, 8 bits of the signal line separate from voice or data are allocated to frames 0 to 15, and the signal bits of 30 lines are assigned 16. Each frame is treated as one multiframe and sent once.

In this way, in any of the transmission systems, each line for voice or data has only one bit of information for monitoring and control, so it can only support one terminal. However, due to advances in audio bandwidth compression technology in recent years, the required bandwidth for transmitting audio has increased from the conventional 64K bits/second to 32K bits/second.
Bits per second or 16K bits per second. Therefore, the remaining bandwidth can be used for transmitting images or other data information. Therefore, although it has become possible to connect many terminals including telephones, there is a lack of signal bits to monitor and control them.

Table 1 (C) Object and realization method of the invention As described above, conventional signals for monitoring and controlling lines for transmitting or exchanging voice or data only have the amount of information equivalent to one bit indicating whether it is on or off. Since only one terminal can be supported, the purpose is to increase the number of bits per line to two or more, and to monitor and control a plurality of terminals.

To obtain more than 2 signal bits per line, 1
The next group of 30 channel (line) based PCM transmission systems uses bits that are not normally used, including the B bit shown in Table 1. If the B bits are used for other purposes, adjacent bits of the B bits in the same frame are used, or another 64 Kbit/sec line is newly used for signaling bits.

As a method of obtaining signal bits, if one multiframe is increased from the current 16 frames to 32 frames, it is possible to obtain even more signal bits for terminals.

In the case of the primary group 24 channel (line) system PCM transmission system, one or two of the 24 lines for voice or data
The line is used for the transmission of signal bits for monitoring and control purposes. Therefore, the number of voice or data transmission lines is reduced by one or two lines. The usage of signal bits is the same as in the case of the primary group 30 channel (line) system PCM transmission system.

There is also a common line signaling method for transmitting the above-mentioned signal information between exchanges, but it requires more time for transmission than in the case of the present invention.

(D) Description by Examples Examples of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows the state of connection between a line and two terminals at both ends thereof after the line has been set up by an exchange. FIG. 2 shows the on/off states of signals in the signal bit line of the transmission path and the sending state of selection signal information (telephone number of the called party), etc., at the time of setting the line and thereafter. The terminals are a telephone and a data terminal at both ends of the line, and two bits are assigned to each terminal for both transmission and reception. In this case, the signal lines are connected to the phone by SS0, SR0,
SS1 and SR1 will be used for the terminals, and control and monitoring such as startup for line setting will be performed by SS0 and SR0, and both data terminals will be connected after the receiving phone responds and the line becomes communicable. It is assumed that SS1 and SR1 control and monitor communication between machines. In order to prevent a collision when both data terminals start up at the same time, the telephone that made the call at the time of line setup is given priority for communication in this case.

The functions of each device in FIG. 1 are as follows. (1) is a telephone (digital and includes a band compression function), (2) is a data terminal, and (3) is a digital line termination device, and (10) is a 32K bit/second voice or data transmission information terminal. The channel and (20) 4Kbit/s individual signal channels are connected.

(4) is an in-office line termination device, and information or signals are transmitted between the digital line termination device (3) on the terminal side and the two-wire time division transmission system (ping-pong transmission system) (30). (5) is a communication path device of the exchange, and (6) is a signaling device, and the respective information and signals from the telephone and the terminal are sent to the communication path and signaling device of the converter. (
50) and (51) are digital transmission paths between converters,
(50) is an information line, and (51) is a signal line shown in FIG.

(1) to (10) in FIG. 2 show examples of the processing status of the originating exchange, and the contents are as follows.

(1) Telephone calls (exchange starts) (2) Selected numeric signal receiving device ready to receive (3) Selected digit signal sent (4) Receiving telephone responds (5) Calling terminal makes a call (6) Receiving terminal Answering the machine (7) Disconnecting the calling terminal (8) Disconnecting the called terminal (9) Disconnecting the calling telephone (10) Opening the line (E) Effects of the invention In the past, it was impossible to connect terminals and make a call between the terminals at the same time after setting up a line using an exchange. In the future, advances in audio bandwidth compression technology will make it possible to connect various terminals to a 64K bit/second line in terms of transmission capacity, but it will be difficult to monitor and control these multiple terminals. It was a problem. This can be done by using the common channel signaling system of the exchange, but it takes time to transmit the signal information and the processing within the exchange becomes complicated. According to the present invention, signals can be transmitted instantly, and processing within the exchange is simple.

As the information society progresses in the future, it is expected that there will be an increasing demand for information transmission between many terminals at the same time, and the present invention can appropriately accommodate this.
It can contribute to the development of an information society.

[Brief explanation of drawings]

FIG. 1 shows the state of connection between the line and two terminals at each end of the line after the line has been set up by an exchange. (1) is a digital telephone, (2) is a data terminal, (10) is an information channel for voice or data transmission, (20) is an individual signal channel, (3) is a digital line termination device, (30) is a subscriber line, (4) is the in-office line termination device, (5) is the communication path device of the exchange, (6) is the signal device, (50) is the information line of the digital transmission path between the exchanges, and (51) is also the signal line. Indicates the line. FIG. 2 shows the on/off states of the signal on the originating side of the line of FIG. 1 and the sending state of selection signal information, etc.

Claims (1)

[Claims] ■Line monitoring and In a separate 64K bit/second signal bit line used in multi-frame for control, two or more signal bits per voice or data line are allocated to each line by multi-frame. A multiple terminal control method that individually monitors and controls two or more terminals per line by integrating the signals necessary for monitoring and control.