JPS61158226A - Data transmission system - Google Patents

Abstract

PURPOSE:To transmit and receive high-speed signals through an existing inexpensive low-speed transmission line by distributing the signals of a high-speed PCM highway to plural low-speed PCM highways and then multiplexing them again onto the high-speed PCM highway. CONSTITUTION:The signals on a highway of 6.3Mbps are distributed to four highways of 1.544Mbps by a distributing circuit (DMUX)22. The data stream of each highway is sent via a low-speed PCM highway 23, 27 and a transmission line of 1.544Mbps like a low-speed PCM communication circuit 25. The transmitted signal is received by a low-speed DTI26 and undergoes the multi-frame synchronizing through a buffer memory circuit which absorbs the differences caused among frame numbers of four transmission lines. Then the data stream is restored to the original signal stream of 6.3Mbps by a multiplexing circuit (MUX)28.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a high-speed data transmission/reception system between a plurality of electronic exchanges, and specifically, the present invention relates to a system for transmitting and receiving high-speed data between a plurality of electronic exchanges, and specifically, the present invention relates to a method for transmitting and receiving high-speed data between a plurality of electronic exchanges, and specifically, the present invention relates to a method for transmitting and receiving high-speed data between a plurality of electronic exchanges.
This paper relates to a transmission/reception system between electronic exchanges that handles high-speed signals called s.

(Prior Art) Conventionally, in this type of data transmission, the sending/receiving speed is 6.
At 3 Mbpa (microbits per second), data had to be sent and received through a high-speed transmission line of 6.3 Mbps or higher. Such transmission lines are not very popular in general communication networks, and if a 1.544 Mbps transmission line in the -order group can be used, the transmission line can be constructed more economically.

(Object of the invention) The present invention has been made in view of the above-mentioned problems.
．． When transmitting 3 Mbps signals, the existing 1,544
The purpose of this invention is to provide an economical data transmission system that can send and receive signals using an Mbps transmission path.

(Structure of the Invention) In data transmission between a plurality of electronic exchanges, a data transmission system according to the present invention includes a high-speed PCM highway carrying a high-speed data stream, and a signal on the high-speed PCM highway being transferred to a plurality of low-speed PCM networks. means of distributing to;
and means for transmitting low-speed PCM signals are provided on the transmitting side, and means for receiving low-speed PCM signals is provided on the transmitting side, and means for detecting frame signals from the low-speed PCM way and transmitting multiple low-speed PCM signals.
After multi-frame synchronization of highway signals,
A means for multiplexing on a high-speed PCM highway and a high-speed PCM highway are provided on the receiving side, for example, 6.3 Mbps, 96 CH P.
4 CM Highway data at 1.544 Mbps
Each 24 channels are distributed and transmitted to the PCM highway of
These are multiplexed on the receiving side and the original 6.3Mbp
The data is received as PCM highway data of s.

(Preferred Embodiments of the Invention) Hereinafter, the present invention will be described with reference to the drawings.

FIG. 3 shows a conventional transmission system, and is an example of a case where data is transmitted through a transmission line whose speed corresponds to the internal bit rate. The output of the time division switch 10 of the electronic exchange, which is a high speed time switch, is multiplexed into 96 channels and connected to the PCM highway 11 of 6.3 Mbps. This data is converted to 6.31V by a high-speed data transfer interface device (hereinafter referred to as DTI) 12.
ll) High-speed PCM of ps or faster transmission line
The signal is transmitted to the receiving high-speed DT 114 via the communication circuit 13.

FIG. 1 is a diagram showing a transmission system according to an embodiment of the present invention, in which high-speed data is divided into a plurality of data transmission paths and transmitted. Further, FIG. 2 is a block diagram showing the receiving section according to the present invention in more detail. According to FIG. 1, the signal on the highway of 6.3 Mbps is transmitted through four 1.544
It is developed into a Mbps signal. Each data stream is a low speed PCM highway 23.27 and a low speed PCM
1. such as communication line 25; , 544 Mbps. On the receiving side, a multiplexing circuit (M
UX) Multiplex to the original 6.3 Mbps from 28 VC. To explain the receiving side part in detail with reference to FIG. 2, the signal coming from the 1.544 Mbps transmission line is received by the low speed DTI 26. Its output is stored in a buffer memory circuit (BUF) 3o. Although one frame synchronization is achieved between DTIs at both ends of the same transmission path, in the case of a multi-frame configuration, a shift in frame number may occur due to the four transmission paths. The buffer memory circuit 30 is a circuit designed to absorb this. The circuit that identifies the frame number is the frame number detection circuit (FD).
It is 31. After synchronizing the multiframes on the four transmission lines in this way, the multiplexing circuit (MUX 2)
8 to recover the 6.3 Mbps signal stream.

(Effect of the invention) According to the transmission method of the present invention, when transmitting a 6.3 M1) ps signal, an existing 1.544 Mbps transmission line can be used without constructing a new expensive 6.3 Mbps transmission line. This has the effect of making economical data transmission possible.

[Brief explanation of the drawing]

FIG. 1 shows a transmission system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing in more detail the receiving section of the transmission system according to the present invention, and FIG. 3 is a schematic diagram showing a conventional transmission system. 10... Time division switch of electronic exchange, 11.15.
...High-speed PC CIVI Highway, 12.14... High-speed data transfer interface device, 13... High-speed PCM communication circuit, 22... Distribution circuit, 23.27... Low-speed 1) CM Highway, 24.2
6...Low speed data transfer interface device, 25...Low speed PCM communication line, 28... Multiplexing circuit. 30... Buffer memory circuit, 31... Frame number detection circuit.

Claims (1)

[Claims] In a data transmission system between a plurality of electronic exchanges, a high-speed PCM highway carrying a high-speed data stream, means for distributing a signal on the high-speed PCM highway to a plurality of low-speed PCM highways, and means for transmitting a low-speed PCM signal are each provided. A means provided on the transmitting side for receiving a low-speed PCM signal, a means for detecting a frame signal from a low-speed PCM highway, and multiplexing the signals on a plurality of low-speed PCM highways onto a high-speed PCM highway after multi-frame synchronization is achieved. , and a high-speed PCM highway are provided on the receiving side.