JPH0983478A - Multiplexer for digital communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely set a line so as to freely change arrangement information for line multiplexing, that is, line setting information in matching with a data speed and the number of a terminal equipment without providing the information as a fixed pattern. SOLUTION: As soon as a multiplexing control section 14 sets arrangement information to a multiplexer section 12, an input device 3 gives a command of transmission of the arrangement information to a 2nd channel control section 13 as it is. The 2nd channel control section 13 uses a 2nd channel in synchronization data used by the multiplexer section 12 to make transmission to the opposite party. A receiver side receives the arrangement information and informs it to the multiplex control section 14 and the multiplexer control section 13 sets it to the multiplexer section 12. The 2nd channel is a control channel to send arrangement information or the like. Thus, the input device 3 sets or changes freely the arrangement information between its own station and the opposite station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital communication multiplexer, and more particularly to a digital communication multiplexer having an improved line setting method.

[0002]

2. Description of the Related Art Conventionally, a line setting method of this kind of multiplexer for digital communication has the same multiplexing information, that is, arrangement information required for line setting between opposite multiplexers, and this arrangement information is used. It is performed by multiplexing the original. For example, a fixed pattern of some placement information is shared by multiplex devices, and the pattern identifier is notified from one of the opposite devices to the other via the same line as the data, so that line multiplexing between the opposite devices can be performed. The conversion information is the same.

In the example of digital communication at 64 kbps,
As shown in FIGS. 2 (a) to 2 (c), the transmission path signal has 80 bits as one block, and the first bit and the 8th bit from each block are arranged with data for synchronizing between the opposite devices. Of these, 1 bit is used for a channel (also referred to as a 2nd channel) for transmitting multiplexing information such as arrangement information between the multiplexers. When the data on the terminal side is transmitted to any of the remaining bits corresponding to 56 kbps other than the synchronization data in any of the arrangement patterns as shown in FIGS. 3A to 3C and the arrangement pattern is changed, 2nd is used. The channel is used to notify the other party of the pattern.

[0004]

As described above, since the conventional multiplexer for digital communication has the arrangement information as a fixed pattern, it can be freely adjusted according to the data rate and the number of terminals other than the pattern. There is a problem that the multiplexing setting cannot be made.

[0005]

A digital communication multiplexing apparatus of the present invention is based on a terminal interface section for exchanging data with a plurality of terminal apparatuses and each piece of data from the terminal interface section side based on arrangement information. A multiplexing unit for multiplexing and decoding high-speed data, a line interface unit for transmitting and receiving the multiplexed high-speed data to and from an opposite station via a high-speed digital communication line, the opposite station and the A 2nd channel control unit for inserting and extracting a 2nd channel for exchanging arrangement information into a predetermined time slot of the high-speed data, and an arrangement of the arrangement information input from an external input device or the 2nd channel control unit. There is. It is composed of a multiplexing control unit which is supplied to the multiplexing unit.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, a digital communication multiplexing device 1 is a DTE for transmitting and receiving data to and from a terminal device 2.
2 is constantly monitored from the signals from the lines received from the interface unit 11 and the line interface unit 15 to synchronize with the opposite multiplexer, and the terminal data from the DTE interface unit 11 is sent. Multiplexing unit 12 that multiplexes / decodes based on the arrangement information from multiplexing control unit 14, 2nd channel control unit 6 that performs 2nd channel transmission / reception with the opposite multiplexing device in a basic procedure, and 2nd channel control The unit 13 or the external input device 9 receives the arrangement information for multiplexing, and the multiplexer 12
And the line interface unit 7 for physically exchanging signals with the digital line 4.

Next, the operation of FIG. 1 will be described. In the initial state, the multiplexing allocation information is not set in the multiplexing control unit 14, and communication other than the 2nd channel in the synchronization data cannot be performed. Therefore, the external input device 3
To the multiplexing control unit 14 with the arrangement information of multiplexing according to the number of terminal devices and each data rate. The multiplexing control unit 14 sets the input arrangement information in the multiplexing unit 12 and issues an instruction to the second channel control unit 13 to transmit the arrangement information itself to the opposite multiplexer. As shown in FIG. 2, when the transmission path signal has 80 bits as one block, the arrangement information is 1 for each bit.
Numbers from 80 to 80 are assigned, and the bit of each number is designated by a value such as "A" or "B" which is attached to each terminal device.

The 2nd channel control section 13 sends the arrangement information received from the multiplexing control section 4 through the 2nd channel to a basic procedure (basic data transmission control procedure: JIS).
In C6325), the user data such as “02 = A” is transmitted to the remote multiplexer.

On the other hand, in the opposite multiplexer which has received the arrangement information, conversely, the second channel controller 13 to the multiplexer controller 1
4, and the multiplexing control unit 14 sets it in the multiplexing unit 12. As described above, the arrangement information between the opposite devices becomes the same, and the data communication between the terminals becomes possible. Also, when the arrangement information is changed, the same procedure can be performed.

[0011]

As described above, the multiplexer for digital communication according to the present invention allows the setting information of the arrangement information, which has been a fixed pattern in the past, to be freely changed from the input device. There is an effect that the line can be set by freely changing the combination of different terminal devices.

[Brief description of drawings]

FIG. 1 is a block diagram showing an exemplary embodiment of the present invention.

FIG. 2 is a bit arrangement diagram of a transmission path signal, where (a) is an arrangement example 1, (b) is an arrangement example 2, and (c) is an arrangement example 3.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multiplexing device for digital communication 2 Terminal device 3 Input device part 4 Digital line 11 DTE interface part 12 Multiplexing part 13 Multiplexing control part 14 2nd channel control part 15 Line interface part

Claims (1)

[Claims] 1. A terminal interface unit for exchanging data with a plurality of terminal devices, a multiplexing unit for multiplexing and decoding each data on the terminal interface unit side into high-speed data based on arrangement information, A line interface unit for transmitting / receiving the multiplexed high-speed data to / from the opposite station via a high-speed digital communication line on the side of the multiplexing unit and a 2nd channel for exchanging the arrangement information with the opposite station are provided at predetermined times And a multiplexing control unit that holds the arrangement information input from an external input device or the 2nd channel control unit and supplies the arrangement information to the multiplexing unit. A characteristic multiplexing device for digital communication.