JP3056072B2 - Time division multiplexer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time-division multiplexing apparatus, and more particularly, to ITU-T Recommendation V.3. 24 / V. 28 has a plurality of terminal interfaces, and turns on / off states of RS signals into information and transfers the information to a partner station. The present invention relates to a bit multiplexing time-division multiplexing device having a function of monitoring received data for validity / invalidity or transmission path failure.

[0002]

2. Description of the Related Art Referring to FIG. 3, a conventional bit multiplexing type time-division multiplexing apparatus multiplexes terminal data input through terminal lines X-1 to X-n to a transmission line Y and transmits the multiplexed data. N terminal interface units 20 corresponding to n terminal lines for performing impedance conversion and the like for transmitting multiplexed / demultiplexed data obtained by separating the multiplexed data input from the lines to the terminals through the terminal lines X-1 to X-n. 1-2
0-n and time-division multiplexing for sending n terminal data output from each of the terminal interface units 20-1 to 20-n to the transmission line Y, and multiplexed data input from the transmission line Y. A MUX / DEMUX unit 21 for demultiplexing for transmission to each terminal, and a MUX / DEMUX
Unit 21 for transmitting the multiplexed data output from the transmission line Y to the transmission line Y and transmitting the multiplexed data input from the transmission line Y to the MUX.
/ DEMUX unit 21 and a line interface unit 22 for performing each impedance conversion and the like.

[0003] With this configuration, the bits for transmitting the RS signal to one port are multiplexed one bit per frame, so that in the case of n ports, one frame requires n bits of RS signal transmission bits. .

[0004]

In this conventional time-division multiplexing apparatus, the number of bits for transmitting an n-port RS signal is one.
Since n bits are required per frame, the original purpose of data transmission / reception with respect to the time division multiplexing device of the opposite station is reduced by n bits, and the data transmission efficiency is reduced.

Accordingly, an object of the present invention is to provide a time division multiplexing apparatus for performing data communication on a digital transmission line,
An object of the present invention is to realize an increase in the number of connectable terminals or an increase in the data communication speed of each terminal by transmitting RS signals of n terminal interfaces at one bit per frame.

[0006]

A time-division multiplexing apparatus according to the present invention is a time-division multiplexing apparatus for performing data communication on a digital line by a bit multiplexing method. 24 / V. The terminal interface that conforms to 28 have multiple ports, independently for each of the plurality of ports each respective ports by linking the R S signal and the CD signal, the plurality ports
RS signal transmission bits and CD signal transmission bits
Is sub-framed into a 1-bit configuration.
You.

[0007]

Further, a time division multiplexing device according to the present invention
ITU-T Recommendation V. 24 / V. A plurality of terminal interface means corresponding to the number of n ports for electrically level-converting the terminal transmission / reception data conforming to M.28, and a plurality of first RSs from each of the n port number terminal interface means outputs during multiplexing transmission. Signal ON / OFF state is 1/0 of binary
, And the bit information is converted into bit information.
The first RS bit information of each of the number of ports is multiplexed one bit at a time in a frame at a predetermined fixed position in one frame in the bit multiplexing system, and the bit position is synchronized with the opposite station. And a first sub-frame signal is obtained by multiplexing the first sub-frame signal into a frame preceding the n-th frame in which the n-ports of the first RS signals are multiplexed, to obtain a first sub-frame configuration signal. During multiplex reception, the opposite station receives multiplex transmission data from the opposite station which is subframed and multiplexed and transmitted at a second fixed position in one frame in one frame, and multiplexes the received data. The second sub-frame signal is detected from the separated second sub-frame configuration signal, and n bits at the second fixed position in n frames after that frame are converted into one bit. An RS signal sub-frame generating means for sequentially outputting a CD signal corresponding to each of the n ports, and a first main signal data output from the plurality of terminal interface means corresponding to the n ports during the multiplex transmission. The first subframe forming signal from the RS signal subframe forming means is MUXed for each frame and output as multiplexed transmission data of its own station, and at the time of multiplexing reception, multiplexed transmission is performed at the opposite station. The multiplexed transmission data of the opposite station received by the own station is DEMUXed into second main signal data and the second subframe configuration signal for each frame, and the DEMUXed n
The plurality of second and main signal data corresponding to the ports are output to each of the plurality of terminal interface means corresponding to the number of n ports, and the second subframe configuration signal is output to the R port.
MUX / DEMU to output to S signal sub-frame conversion means
X means, interfacing the MUX / DEMUX means with a digital line and providing the MUX / DEMUX
The multiplexed transmission data of the own station output from the means is transmitted to the opposite station through the digital line, and the multiplexed transmission data of the opposite station input through the digital line is received and output to the MUX / DEMUX means. Line interface means.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. Referring to the block diagram of FIG. 1, which is an embodiment of the present invention, a bit multiplexing time-division multiplexing apparatus that can connect n ports of terminals (DTEs) is described in ITU-T Recommendation V.3. 24 / V. N terminal interface units 10-1 to 10-n corresponding to n terminals for electrically level-converting terminal transmission / reception data conforming to No. 28, and terminal data from the terminal interface units 10-1 to 10-n. The bit configuration of the digital transmission line Y is multiplexed, the subframe configuration of the RS subframe conversion unit 13 described later is multiplexed and output to the line interface unit 12 described later, and the multiplexed data from the line interface unit 13 is transmitted to the terminal. DEM for data of interface units 10-1 to 10-n
MUX / DEMUX unit 11 that performs UX, and MUX / DE
The multiplexed data from the MUX unit 11 is transmitted to the opposite station through the digital transmission line Y, and the multiplexed data transmitted from the opposite station and input through the digital transmission line Y is received and output to the MUX / DEMUX unit 11. The line interface unit 12 and the terminal interface units 10-1 to 10 to transmit multiplexed data to the opposite station.
-N RS signal transmission bits for synchronizing with the opposite station at a fixed position of the bit frame configuration in the bit multiplexing method and RS signal transmission bits for each port are created in a subframe configuration, and MUX / D
The information at the fixed position in the bit multiplexing method is input from the EMUX unit 11, a specific pattern is detected by the subframe bits from the subframe configuration, and the subsequent bit configuration is used for the terminal interface units 10-1 to 10-n ports. And the above-mentioned RS sub-frame conversion unit 13 that divides the data into CD transmission bits as needed.

[0010] Specifically, the RS signal sub-frame conversion unit 1
Reference numeral 3 denotes an n-port RS signal at a fixed position in one frame in the bit multiplexing method, in which the on / off state of the RS signal corresponds to 1/0 of a bit at the time of transmission, and the RS signal of the n port is sequentially transmitted for each frame. Multiplexed, and further multiplexes a subframe signal for synchronizing with the partner station at the bit position in a frame before the nth frame in which the n-port RS signal is multiplexed into a subframe, and at the time of reception, A sub-frame signal is detected from a signal sub-framed at a certain fixed position in one frame, and n bits at a fixed position in n frames after that frame are sequentially detected as a CD signal of n ports one bit at a time. Send out.

[0011] The MUX / DEMUX unit 11 has n-port terminal interface units 10-1 to 10-1 for multiplex transmission.
MUX is performed on the data of the 0-n output and the data from the RS signal sub-frame forming unit 13 for each frame, and at the time of multiplex reception, the terminal interface units 10-1 to 10-n corresponding to n ports are performed for each frame. Each data and RS
The data to the signal sub-frame forming unit 13 is DEMUXed.

Next, the operation will be described with reference to FIG. 2 and FIG.

For example, when data transmission at 64 Kbps is performed in a multi-frame having a configuration of 80 bits per frame, 10 frame bits for frame synchronization are used in octets. At this time, the data transmission rate per bit of this frame is 800 bps.

On the other hand, in the conventional method, when the data transfer rate at the terminal interface port is 4800 bps, 6 data transmission bits per frame and R
Since one bit is required to transmit the S signal, when connecting at the same speed, it was possible to connect up to ten terminal interfaces in an 80-bit frame configuration.

On the other hand, in the embodiment of the present invention,
The 10 RS signal transmission bits in the above-described conventional method are placed at, for example, the position of the subframe (S) shown in the 80-bit frame configuration example of FIG. 2A, as shown in the subframe configuration example of FIG. Are multiplexed one bit at a time for each frame, and subframe bits (f) are further multiplexed.

As a result, the data transmission speed becomes 4800
When ten terminals of bps are connected, it can be realized by 71 bits by adding 10 bits of frame bits.

[0017]

As described above, according to the present invention, n
Since the transmission of the RS signal of one terminal interface can be performed with one bit per frame, the number of connectable terminals can be increased and the data communication speed of each terminal can be increased.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a time division multiplexing device according to an embodiment of the present invention.

FIG. 2 shows an example of an 80-bit frame configuration (a) and an example of a subframe configuration (b) in the time-division multiplexing apparatus of the embodiment.

FIG. 3 is a block diagram showing a conventional time division multiplexing device.

[Explanation of symbols]

 1 Time Division Multiplexer 10-1 Terminal Interface Unit 10-2 Terminal Interface Unit 10-n Terminal Interface Unit 11 MUX / DEMUX Unit 12 Line Interface Unit 13 RS Subframe Unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-202833 (JP, A) JP-A-52-91312 (JP, A) JP-A-63-281535 (JP, A) JP-A 8- 237213 (JP, A) JP-A-61-118032 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04J 3/00 H04L 29/10

Claims (2)

(57) [Claims] 1. A time division multiplexing apparatus for performing data communication on a digital line by a bit multiplexing method.
T Recommendation V. 24 / V. The terminal interface that conforms to 28 have multiple ports, independently for each of the plurality of ports each respective ports by linking the R S signal and the CD signal, the double
RS signal transmission bit for several ports and CD signal transmission bit
Characterize the sub-frame into 1-bit configuration
Time-division multiplexing device. 2. An ITU-T Recommendation V. 24 / V. A plurality of terminal interface means corresponding to the number of n ports for electrically level-converting terminal transmission / reception data conforming to M.28, and a plurality of first RSs from each of the output of the terminal interface means having the number of n ports during multiplex transmission. The on / off state of the signal is made into bit information corresponding to 1/0 of the binary value, and the first RS bit information of each of the n ports converted into the bit information is stored in advance in one frame in the bit multiplexing method. One bit is multiplexed one by one for each frame at a predetermined fixed position, and a first subframe signal for synchronizing with the opposite station is multiplexed at the bit position with the first RS signal of the number of n ports. Multiplexed into a frame before the n-th frame to be multiplexed and sub-framed to form a first sub-frame configuration signal. The second station receives and multiplexes and demultiplexes the multiplexed transmission data from the opposite station which is subframed and multiplexed and transmitted at the second fixed position in the frame.
The second sub-frame signal is detected from the sub-frame configuration signal, and n bits at the second fixed position of n frames after that frame are sequentially converted into a CD signal for each of the n ports, one bit at a time. Means for outputting an RS signal sub-frame, and at the time of multiplexing transmission, first main signal data output from the plurality of terminal interface means corresponding to the number of n ports and the first sub-signal from the RS signal sub-frame forming means. The MUX unit multiplexes the frame configuration signal and the frame-by-frame and outputs it as multiplexed transmission data of the own station. At the time of multiplex reception, the multiplexed transmission data of the opposite station received by the opposite station is multiplexed and transmitted by the opposite station. To the second main signal data and the second subframe configuration signal for each frame, and the DEMUXed n MUX for outputting the plurality of second main signal data corresponding to ports to each of the plurality of terminal interface means corresponding to the number of n ports and outputting the second subframe configuration signal to the RS signal subframe forming means / DEMUX means, interfacing the MUX / DEMUX means with a digital line, and transmitting the multiplexed transmission data of the own station output from the MUX / DEMUX means to the opposite station through the digital line and through the digital line. A line interface unit for receiving the multiplexed transmission data of the opposite station and outputting the multiplexed transmission data to the MUX / DEMUX unit.