JPS60180235A - Supervisory system of relay transmission line - Google Patents

Abstract

PURPOSE:To supervise repeaters over the entire transmission line by constituting a transmission line so that a repeater supervisory signal is detoured from a terminal station device or the like on the way in the transmission line on the midpoint of which a terminal station device or the like is installed. CONSTITUTION:The transmission line is formed by connecting terminal station devices of stations A, B and C in series, and the station B functioning as the intermediate station is provided with a regenerative repeater 2 for transmission line termination, a branching repeater 4, a transmission line supervisory signal detector 5 and a switching means for including detour switch sections 6, 7. When a transmission line supervisory signal (pulse trio) comes to the station B, the detector 5 detects it, the detecting signal activates the switch sections 6, 7 to change over the station B to a transmission line supervisory signal detour circuit 8 thereby connecting directly the transmission lines between the stations A and B and between the stations B and C. Thus, the entire transmission line between the stations A and C is supervised.

Description

DETAILED DESCRIPTION OF THE INVENTION 4. Technical Field of the Invention The present invention relates to a relay transmission path monitoring system, and more specifically, a system for monitoring a relay transmission path, in which a terminal device or a branch relay device is installed in the middle of a digital relay transmission path, and the transmission path is divided. A relay that monitors the entire transmission path by bypassing the device that divides the transmission path and sending the transmission path monitoring signal to the further transmission path when the transmission path monitoring signal is sent to the transmission path. This relates to a transmission path monitoring method.

, Description of the Prior Art In a digital relay transmission line, terminal equipment is usually installed at both ends of the transmission line and are facing each other, and monitoring of regenerative repeaters on the transmission line is carried out between the two end stations. It is being done. The transmission line monitoring signal used at this time is a signal called a pulse trio that violates the bipolar rule.
-1. Three consecutive pulses with one more 1 on the positive side, such as +1), or three consecutive pulses with one more one on the negative side, such as (-1, +1.-1), alternating at a constant period. is sent out to the transmission path. Since the regenerative repeater on the transmission path has independent positive and negative pulse regeneration repeating circuits, it is possible to detect whether the normally transmitted Bibo 2 pulses or the pulse trio that violates the Bibaud 2 rule for transmission path monitoring can occur on the transmission path. The transmission signal can be transmitted in its form from end to end.

However, when a branch repeater is installed in the middle of the transmission line,
In these devices, a bipolar pulse is converted into a unibo 2 pulse and then converted back into biborder 2, so a code that violates the bipolar rule, such as a pulse trio for transmission line monitoring, is converted into a code that satisfies the bipolar rule. As a result, a pulse trio is not formed and the transmission path beyond this point cannot be monitored. Furthermore, since the transmission line is completely cut off when the terminal equipment is installed, it is no longer possible to monitor the transmission line beyond this point. For this reason, the transmission line can only be monitored in each section where a device dividing the transmission line is installed, and the entire transmission line cannot be monitored from the end station.

OBJECTS OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks, and therefore, an object of the present invention is to provide a transmission line in which a terminal device or the like is installed in the middle of the transmission line.

It is an object of the present invention to provide a new relay transmission line monitoring system that configures a transmission line by bypassing intermediate terminal equipment, etc. so that repeater monitoring can be performed over the entire transmission line.

Establishment of the Invention In order to achieve the above object, a relay transmission line monitoring system according to the present invention is applied to a transmission line in which a terminal device or a branch repeater is installed in the middle of a digital transmission line.

When a transmission line monitoring signal is sent from the terminal at the end of the transmission line, an intermediate device detects the transmission line monitoring signal, disconnects the device from the transmission line, and connects the interrupted transmission line by a detour. The present invention is characterized in that the transmission path monitoring signal is sent to a further transmission path to monitor the entire transmission path.

3. Detailed Description of the Invention Next, a preferred embodiment of the present invention will be specifically described with reference to FIG.

Figure 1 is a diagram for explaining an example of an actual gun of the present invention.
It shows a transmission line in which six stations, A station and B station, are connected in series. In the figure, the intermediate station (B station) includes a transmission line termination regenerative repeater 2, a branch repeater 4, and a transmission line monitoring signal detector provided between the regenerative repeater 2 and the branch repeater 4. 5
．． Means for switching to the transmission line monitoring signal detour 8 is provided, which includes a detour switching section 6.7.

Now, suppose that a transmission line monitoring signal is sent from station A in order to monitor repeaters from station A to station C. The transmission path monitoring signal (pulse trio) is transmitted as is from station A to B4, allowing monitoring of the repeater.

However, at station B, the B
The output of the station will not be a pulse trio.

Therefore, as shown in Fig. 1, a detour 8 is provided at the B station, and when the transmission line monitoring 1 word comes, the B station is switched to the detour 8, and the A
If you directly connect the transmission line between station B and station B and station B,
All transmission lines between stations A and 6 can be monitored.

Effects of the Invention As described above, according to the present invention, even if there is something that divides the transmission path, such as an end station device or a branch repeater device, in the middle of the transmission path, it is possible to bypass this. In this case, it is possible to monitor all transmission paths.

[Brief explanation of the drawing]

FIG. 1 is a line configuration diagram showing one practical example of the present invention. 1... Terminal device, 2... Regenerative repeater (for transmission line termination). 3... Regenerative repeater (for intermediate), 4... Branch repeater. 5... Transmission path monitoring signal detector, 6... Detour switching section (drive section), 7... Detour switching section (switching section), 8...
・Detour patent applicant NEC Corporation Representative Patent attorney Yutabe Kumagai

Claims (1)

[Claims] In a transmission path where a terminal station device or a branch repeater device is installed in the middle of the digital transmission path, when a transmission path monitoring signal is sent from the end terminal of the transmission path, the device in the middle detects the transmission path monitoring signal. The apparatus is then separated from the transmission line, and the interrupted transmission line is connected to multiple detours to transmit the transmission line monitoring signal to further transmission lines, thereby monitoring the entire transmission line. Relay transmission path monitoring method.