JPS60143031A - Digital signal transmitter - Google Patents

Abstract

PURPOSE:To attain effective utilization of a transmission line at a fault by separating at least one terminal station device from a multiplex separator and connecting the device to a transmission line in a digital signal transmitter provided with the multiplex separator. CONSTITUTION:If both LRE terminal devices 2 are not faulty, switches 3, 5 are thrown to the position in solid lines and normal transmission is attained. If either of the terminal stations 2 is failed and maintenance/inspection is conducted, the switches 3, 5 are thrown to the position shown in dotted lines manually by a private telephone line so as to constitute a transmission system by a PCM- 24 opposite to it. Thus, 24 channels are ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a digital signal transmission system, and in particular to a digital signal transmission device of the CM system or the DSI system.

(b) Technical background In communication lines such as long-distance transmission lines,
The use of time division multiplexed digital transmissions such as PCM-24 is rapidly expanding.

In such transmission equipment, 1 usually 64kb/S
However, recently, in order to improve the efficiency of hand use, 32kb/s Corg (
Low Rate Encoder: LRE)
Adaptive differential P CM (Adaptive D
Iferential PCM: Heno CM) has come to be used.

Similarly, in two-way communications such as telephone calls.

In order to effectively utilize the communication area on the transmission path where voice is not transmitted in many communication paths, the digital voice insertion method (Digital 5peach 1nLerpo
ra-1ion: O81) is used.

(C) Prior art and problems Figure 1 is a block diagram of a PCM-24 transmission system using the LRE method, and 1 is a block diagram of a PCM-24 transmission system based on the LRE method.
4 terminal station equipment, 2 is an LRE terminal equipment that collects PCM-24 terminal equipment 1 for 4 stations and multiplexes and separates communication paths for 96 lines using the LRE method; PCM-24 terminal equipment 1 The signal transmission speed of the transmission line between the terminal station equipment 2 and the LRE terminal equipment 2 is 1.544 Mbps, and the signal transmission speed of the transmission route between the LRH terminal equipment 2 is also 1.544 Mbps.
bps.

In such a transmission system, the opposing LRE terminal equipment 2
If a failure occurs in at least one of the 96 lines, all 96 lines become unusable.

(d) Object of the Invention An object of the present invention is to effectively utilize the transmission line when a demultiplexer in a digital signal transmission system based on the LRE system or 0311 system fails.

(e) Configuration of the Invention, That is, 9 The digital signal transmission device according to the present invention multiplexes digital signals transmitted from the plurality of terminal devices and the plurality of terminal devices, sends the multiplexed signals to the transmission path, and also transmits the signals from the transmission path. This digital signal transmission device includes a multiplexing/demultiplexing device that separates received multiplexed digital signals and sends the signals to a plurality of terminal devices.

Means is provided for separating at least one of the terminal equipment from the multiplexing unit 1 and directly connecting it to the transmission line.

(f) Examples of the invention Next, the gist of the present invention will be specifically explained using examples.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention, in which the same reference numerals as those in FIG. Disconnect one of the terminal equipment 1 from the LRE terminal equipment and connect it to the other party's PC.
3 constitutes means directly connected to one of the M-24 terminal equipment 1;
and 5 are switching devices, and 4 is a bypass transmission line.

If there is no failure in both LRE terminal devices 2.

Switches 3 and 5 are switched to the side shown by the solid line in the figure, and both Ll? Correct transmission is performed between the E terminal equipment 2.

On the other hand, if a failure occurs in one of the LRE terminal stations 2 or when maintenance and inspection are to be performed, a The switching devices 3 and 5 are manually switched to the side indicated by the dotted line in the figure through communication through a dedicated telephone line (not shown), and a transmission system is constructed by the PCM-24 terminal equipment 1 facing each other.

Therefore, even if any LRE @ station 2 cannot be used, 24 communication lines can be secured.

(g) Detailed Description of the Invention As described above, according to the present invention, it is possible to effectively utilize a transmission path when a demultiplexing device in a digital signal transmission system based on the LIiE system or DS1 system fails.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional example of a PCM-24 transmission apparatus using the LRE method, and FIG. 2 is a block diagram of an embodiment of the present invention. In these figures, 1 is IIcM-24 terminal equipment, 2
3 is a switch, and 4 is a bypass transmission line.

Claims (1)

[Claims] Multiplexing that multiplexes digital signals sent from multiple terminal devices and multiple terminal devices and sends them to a transmission path, and separates the multiplexed digital signals sent from the transmission path and sends them to multiple terminal devices. A digital signal transmission device comprising a multiplexing and demultiplexing device, the digital signal transmission device comprising means for separating at least one of the terminal devices from the multiplexing and demultiplexing device and directly connecting it to a transmission path. Device.