JPS58197940A - Failure restoration system for loop transmission line - Google Patents

Abstract

PURPOSE:To quicken the restoration of a communication system by making a loop back to an adjacent terminal station, if a failure is detected, and also by installing the means for sending a transmission signal to the failed terminal station. CONSTITUTION:If a terminal station 7-2 fails, a loop back is formed at an adjacent terminal station 7-1 toward a spare circuit 4 side from a present circuit 3 side, and simultaneously a path is formed to transmit the signal of the loop back to the station 7-2 via the circuit 3. At the other adjacent terminal station 7-3, a loop back is formed toward the circuit 3 side from the circuit 4, and the transmission signal of the loop back is sent to the station 7-2 via the circuit 4. If the failure of the terminal station 7-2 is released, the transmission signal from the station 7-1 is received by a main station 6 via the circuit 3 and terminal stations 7-2 and 7-3, and the main station 6 releases the loop back of the terminal station 7-3. On the other hand, a signal via the station 7-3, circuit 4 and stations 7-2 and 7-1 is received by the main station 6, and the station 6 releases the loop back of the station 7-1.

Description

[Detailed Description of the Invention] (aJ Technical Field of the Invention The present invention relates to a failure recovery method for a loop transmission line, and in particular, when recovering a failed terminal station, a failure recovery signal is sent from the main station to the main terminal station (hereinafter also referred to as the main station). ) to quickly recover from a failure in a loop transmission line.

(b) Conventionally, the main station and multiple terminal stations that monitor point failures between AVI and AVI are connected to the working line and backup line.
Connected in a loop to 71. In such communication systems, failure monitoring is performed by polling each terminal station from the main station. That is, the main station sends failure data to each terminal station, and each terminal station inserts the response data into the monitoring data of the frame. The main station detects a faulty terminal station from this monitoring data, and if the faulty terminal station is not detected, a loopback connection is made to the terminal station adjacent to the faulty terminal station, and communication is performed excluding the faulty terminal station. Form a system.

Figure 1 shows a conventional failure recovery system for a loop transmission line. It is connected to circuit #3 and protection circuit #4 to form a loop transmission path and form a communication system.

Fault monitoring of the above loop transmission line is performed from the main station 1 to each terminal station 2-
This is done by polling 1 to 2-3.

If terminal station 2-2 becomes disabled due to an accident such as a power outage, main station 1
Since the response data is sent to the polling of WK, which is dangerous, the main station 1 considers the terminal station 2-2 to be a wk harmful terminal station.

- If A62 2 becomes a failure, the above communication system will be destroyed, so in order to transmit this, the main station sends a control signal to the terminal stations 2-1 and 2-3 adjacent to the terminal station 2-2. @Station 2-1.2-3 As shown in Figure 2, an emergency communication system is constructed by making a loopback connection using loop 5.

However, due to the loopback connection on the upstream side, the faulty terminal station 2
-2 is separated from the emergency communication system, so even if the faulty terminal station 2-2 recovers, there is no way to notify the main station 1 of the recovery, so the loopback described above is canceled. Therefore, the communication system that existed before the failure cannot be established.

Since there is currently no suitable method for notifying the above-mentioned recovery of the failed terminal station, notification is performed using other telephone lines.

The above method will damage the fltW of data communication 8, which is time consuming and urgent to recover. Therefore, when recovering from a fault, the local station notifies the main station of the fault recovery, allowing the communication system to recover quickly! (I) There are 6 requests for the old method (c) Purpose of the invention 4+: The invention is based on the above 4! Communication to the station through the restoration of your own station (returning the 8 system to the previous one)
The purpose is to provide a 1lil damage recovery method for a windy loop transmission line.

The purpose of this invention is to use the IC of the present invention to monitor faults in a communication system in which a main terminal station and multiple terminal stations are connected to a working line and a protection line in a loop to form a loop transmission path. In the recovery method, the main terminal station detects a failure in the terminal station, and uses a control signal sent from the main terminal station to connect terminal stations that are in contact with the failed terminal station in a loopback manner, thereby improving the communication system. 54 stations L9 connects via the working line f: C- and the other 4 stations in contact with
Means t-1rL for sending out transmission number 15 together to the faulty terminal station.
When the faulty terminal station is restored, the 54 stations have means for detecting the transmission signal and transmitting fault recovery No. 11 to the main terminal station via the working line or backup line from the own station, and the 54 stations 4 is accomplished by ejecting a signal to release the loose pack of the terminal station adjacent to the #failure 1 station and restore the communication system to the state before the failure.

(・) Implementation sequence of the invention Hereinafter, the present invention will be explained based on the present invention and the drawings.

In Fig. 3, as in Fig. 1, a main station 6 for monitoring faults in the transmission path and a plurality of terminal stations 7 are connected to the working circuit [3] and the protection circuit A4 to form a loop transmission path. There is.

Failure monitoring from the main station 6 to each of the terminal stations 7-1 to 7-3 is performed by polling FC, a monitoring signal is inserted into the frame of transmission No. 1, and loopback control between the ends of tJk is performed.

Now, if the terminal station 7-2 becomes in trouble, an abnormality in the transmission signal (in this case, the transmission is assumed to be a new number) is detected through one terminal station 7-IV iron spare circuit d4t- which is adjacent to the fourth station 7-2. is detected, and the detection signal causes the preliminary circuit 4!1I to be activated from the Kaede circuit -3i+11.
4111IIC loopback is formed, and a path is also formed to transmit the transmission direct code of the loopback to the failed terminal station 7-2 through the working line 3.

The other terminal station 7-31C adjacent to the terminal 7-2K outputs a disconnection signal to the transmission port of the working line 3, and uses this detection signal to form a loopback to the L9 working circuit IIIa on the protection line 4 side, and also loops. The back transmission signal is sent to the terminal station/- through the preliminary review 4.
Transmit to 2.

When the failure of the faulty terminal station 7-2 is restored r6, the transmission signal from the terminal station 7-1 is transferred to the working line, via 1113t-47-2-Kaede line #3-Jl1 line aid for station 7-3-4. It is received by the main station l and detected by the main station l, and the main station 6LQ monitoring signal t-
Transmit it to station 7-3 and cancel the loopback with the #monitoring signal, 4th station 7-d-subset I7! A4 terminal station 7-1-f
4744 and the transmission number 1g of the i11 line, i11 to the main station 6! Saruru. Lord/46? By detecting the i transmission signal r, the E station 6 transmits the monitoring number 15 to the terminal station 7-1, and loopback solution l1kt of the fourth station 7-1 is performed.

In Figure 4, the transmission point 1G of the working area la3 is located at the optical area QR circuit (hereinafter referred to as σ/Em path) 8 of the terminal station /-3 adjacent to 4#4 No. 7-2. detected, and this detection signal controls #
◇This control # circuit is manually inputted to the circuit 9, and the optical @ air conversion (t)/g) circuit 13 - multiplex conversion section 1l - OT # return point (transfer) - contact ■ - electrical source conversion circuit (hereinafter referred to as g101gl1
ll) and Kisun 12-Soul Line 3-Main 146 meridians are formed.

When a disconnection of the signal connected to the faulty terminal station 7-2 is detected in f7tX Fig. J, control #l! 21 path lCg moves and connects the middle excitation point of switch circuit 19 and contact 0, and further connects the m contact ■
By connecting d and contact point (3), a signal route for the working line 3 is created, and a loopback connection is made between the working line d, (and the protection line 4).

Next, when l*薯 of the terminal station 7-2 becomes 41 years old, the loop transmission path between the main station 6 and the plurality of terminal stations 7-1 to 7-3 is restored, and the main p! J
A return signal is detected at 6, and this detection signal is used as the monitoring signal V of the frame of the transmission signal.The control signal 1 for loopback release is inserted into the frame of the transmission signal, and the hostile signal is transmitted via the active line 3 or protection line 4. The signal is input to the terminal station 7-3 (see Figure 4) or between the terminals 7-1 (see Figure 5), and the transmission signal is multiplexed at 141 at the terminal station 71-3 (see Figure 4 f). The monitoring signal is extracted from the frame of
The control circuit 9 is driven by a command to turn the movable contacts -3 and -2 into the OFF state, and the routine bar of both the active terminals -3 and t is released.

In the same way, the terminal station 7-1 in Figure 5 is
A monitoring signal is extracted by the t & switching unit 20, and the control circuit 21 is controlled by the monitoring signal to set the contact (ψ and the movable contact to 0FF).
VC, connect contact O and movable contact Q, and disconnect movable contact 1 and contact @ by turning OFF.

Therefore, the loop transmission line is restored to the communication system before the failure by the recovery of the terminal station 7-2 (f). Since the fault recovery signal from the terminal station can be passed to the main station, it has the advantage that it can be performed over the system 0 and the system 9.

[Brief explanation of drawings]

Figure 1 shows the conventional 41J recovery method for loop transmission repair. Figure 2 shows the loop connection in the event of a failure, and Figure 3 shows the main source 9.
11. Loop paracouple and transmission signal transmission. FIGS. 4 and 5 show the loopback connection and its release by switch operation VC of the terminal station adjacent to the disability office. In the figure, 1.61'j main station, 2-1.2-2.2-3.
7 1st eye chrysanthemum 2 mouth'fJ 3 Fig.

Claims (1)

[Claims] In a fault recovery method for a communication system in which a main terminal station that monitors faults and a plurality of IiI stations are connected in a loop to a working line and a backup line to form a loop transmission path, the main terminal station detects a fault t of the terminal station. - ill sent from one main terminal station to be detected
A communication system is constructed by connecting the terminal stations adjacent to the Wgm station in loopback using the # signal, and one adjacent terminal station connects the standby circuit to the other adjacent terminal station via the working circuit Ia. It has a means for sending a transmission signal to the faulty terminal station via 1IIt, detects one transmission signal when the faulty terminal station is restored, and sends the fault recovery signal from the own station via the working line or protection line to the main terminal. A failure recovery method for a loop transmission line, characterized in that the loop transmission line has a hand R' for transmitting data to a terminal station, detects a wrinkled main terminal station Fi armpit recovery signal, and releases the loopback of a terminal station adjacent to the failed terminal station. .