JPH04207820A - Method of transmitting supervisory signal - Google Patents

Abstract

PURPOSE:To attain transmission of a supervisory signal even if the supervisory signal cannot be transmitted via a transmission line set at a monitor station by switching this transmission line to a bypass line for transmission of the supervisory signal to the monitor station through a switch device at each exchange station if a fault is detected on the transmission line of the monitor station. CONSTITUTION:A route is provided to secure the connection between a monitor station 1 and the least significant exchange stations 10, 11, 12 and 13 through the stand-by transmission lines 30 and 32, a mesh transmission line 21, and the stand-by transmission lines 35 and 31 together with another route that secures the same connection through the stand-by transmission lines 30, 33, a mesh transmission line 20, and the stand-by transmission lines 34 and 31 respectively. Meanwhile the exchange stations 14, 15, 10, 11, 12 and 13 are provided with the switch devices 95, 90, 95, 94, 91 and 92 respectively. In such a constitution, if the transmission line set between the stations 1 and 14 has a fault, the station 14 switches the faulty line to a 2nd bypass line through the device 93 to transmit a supervisory signal to the station 1. Therefore the supervisory signals can also be transmitted to the station 1 through the transmitters of the stations 10 and 11 following the station 14.

Description

[Detailed Description of the Invention] [Summary] A switching station that transmits monitoring signals sent from a lower-level switching center to a higher-level switching center, and a monitoring station that collects monitoring signals transmitted from each switching center. Regarding the supervisory signal transmission method in a supervisory signal network that is connected in a tree shape with active and backup transmission lines as the apex, there is a possibility that the supervisory signal cannot be transmitted at the switching station via the transmission line on the supervisory station side (even if the The aim is to provide a supervisory signal transmission method that can transmit the supervisory signals of the exchanges below the exchange to the monitoring station, by connecting the lowest-level exchanges with a mesh transmission line, and connecting the lowest-level exchanges with the monitoring station. The network is connected to the monitoring station via a detour route that passes through the backup transmission line between each station and the mesh transmission line, and each switching station is equipped with a switching device. When a failure is discovered in the side transmission path, the switching device switches the transmission of the monitoring signal to the detour path and transmits it to the monitoring station.

[Industrial application field]

The present invention is a switching center that transmits supervisory signals sent from lower-level exchanges to higher-level exchanges. In a supervisory signal network connected in a tree-like manner by a network, even if there is a failure in both the active and backup transmission lines on the monitoring station side of each switching station, the monitoring signals of the own station and lower-level switching stations are also transmitted to the monitoring station. This article relates to a possible supervisory signal transmission method.

[Prior Art] FIG. 5 is a block diagram of a conventional monitoring signal network.

The supervisory signal network shown in Fig. 5 has the supervisory station 1 as the apex, and the upper exchange stations 14' and 15° are connected to the supervisory station 1 through working and backup transmission lines, and the upper exchange station 14' is connected to the lower exchange stations 14' and 15°. Switching stations 10° and 11' are connected by a working and backup transmission line, and the upper switching center 15° is connected to lower switching stations 12' and 11'.
13' are connected by a working and backup transmission line, forming a tree-like connection.

Also, between the monitoring station 1 and exchange stations 14' and 15° and exchange station 14''
Transmission devices 40, 41, 42, 45, 43, 4 are provided between the exchanges 10' and 11' and between the exchanges 15' and 12' and 13' for connection to transmission lines.
4,48,51.46. 47. 54, 57, and exchanges 10', 11'.

12', 13' transmission devices 49, 50, 52, 53 .
55, 56, 58, 59 are connected to transmission devices 60, 61, 62, 63°64, 65, 66 via active and backup transmission lines, respectively.
．． It is connected to 67.

In addition to transmitting signals, the transmission device has the function of monitoring the status of its own device and the transmission path and detecting abnormalities. For example, when the transmission device 61 detects an abnormality, it inserts it into the overhead of the signal frame. The monitoring signal being transmitted is notified as an abnormality detection signal to the monitoring device 2 of the monitoring station I via the transmission devices 50.48, 43, and 42.40.

In addition to collecting monitoring information, the monitoring device 2 also has the function of issuing control commands, status information reporting commands, etc. to each transmission device, and for example, control commands and status information reporting commands addressed to the transmission device 61 are sent through the reverse route to the above. The response signal from the transmission device 61 is sent to the monitoring device 2 via the above route.

In the case of Fig. 5, the monitoring signal is transmitted to the monitoring device 2 between each switching station and between the switching station and the monitoring station 1 via the working transmission line, and when the working transmission line becomes abnormal, the protection signal is transferred to the backup transmission line. It is designed to switch and transmit.

[Problem to be solved by the invention]

However, if, for example, the working and backup transmission lines in the same cable are cut off in the transmission line 200, and the monitoring signal cannot be transmitted via the working and backup transmission line on the monitoring station l side, the transmission device 42 of the switching station 14'' The following transmission devices have a problem in that they cannot transmit the monitoring signal to the monitoring device 2.

The present invention provides a supervisory signal transmission method that can transmit the supervisory signals of the exchanges below the exchange to the supervisory station 1 even if the exchange cannot transmit the supervisory signal through the transmission line on the supervisory station L side. intended to provide.

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the present invention.

As shown in Figure 1, an exchange that transmits supervisory signals sent from lower-level exchanges to higher-level exchanges is currently in use, with a supervisory station l that collects supervisory signals transmitted from each exchange as the apex. In a monitoring signal network connected in a tree shape using backup transmission lines, every other lowest switching station 10, 11, 12.13 is connected by a mesh transmission line 20.21, and the monitoring station 1 and the lowest exchange 10. II, the monitoring station l via 12°13
A backup transmission line 30, 32, a mesh transmission line 21 . Routes connected by backup transmission lines 35 and 31, backup transmission lines 30 and 33, and mesh transmission lines 20. A route connected by the backup transmission line 34, 31 is provided, and each switching center 14, 15, 10 . Switching devices 93, 90, 95, 94, 91゜92 are installed in II, 12.13, respectively, and in each switching station, when a fault is discovered in the transmission line on the monitoring station I side, the switching devices The transmission of the monitoring signal is switched to the above-mentioned detour route and transmitted to the monitoring station I.

[For production]

According to the present invention, the backup transmission lines 30, 32, the mesh transmission line 21. The first detour and the backup transmission lines 30 and 33 connected by the backup transmission line 35 and 31, and the mesh transmission line 20. Switching devices 95, 94, 91, 92 are connected to the second detour connected by the backup transmission line 34, 31 and each switching center 10 to 15.
.
3, the signal is switched to the second detour and transmitted to the monitoring station 1, so that the monitoring signals from the transmission devices of the exchanges 10 and 11 below the exchange 14 can also be transmitted to the monitoring station 1.

〔Example〕

FIG. 2 is a block diagram showing the configuration of a monitoring signal network according to an embodiment of the present invention, and FIG. 3 is a diagram showing a detour route and a transmission route in the event of a failure in an embodiment of the present invention. (B) shows a clockwise detour, and FIG. 4 is a diagram showing details of switching to the detour according to the embodiment of the present invention.

The supervisory signal network shown in FIG. 2 differs from the conventional example shown in FIG.
and the point connected by the mesh transmission line 20 and the switching center 1
0 and 13 are equipped with transmission devices 68° and 71 and are connected by a mesh transmission line 2I, and each switching center 10 to 15 is equipped with switching devices 95, 94, 91.92, 93.90, and counterclockwise rotation As shown in FIG. 3(A), the detour includes a switching device 93, a backup transmission line 33. switching device 94, mesh transmission line 20. A detour consisting of backup transmission lines 34 and 31, a switching device 95, and a mesh transmission line 21. Preliminary transmission line 35.31
A clockwise detour is provided using a switching device 90. as shown in FIG. 3(B). Spare transmission line 34
．． switching device 91, mesh transmission line 20. Preliminary transmission line 33
．． 30, and a detour path consisting of the switching device 92, the mesh transmission line 21, and the backup transmission line 32.30.

If this is done, as shown in FIG. switch the transmission path to a detour.

Therefore, for example, the monitoring signal from the transmission device 61 is transmitted to the monitoring device 2 through a detour.

For example, when the transmission device 57 detects an abnormality in the transmission path between the transmission device 47 of the exchange 15 and the transmission device 57 of the exchange 13 in FIG. 3(B), the switching device 92 switches the transmission path to a detour. Switch.

Therefore, for example, the monitoring signal from the transmission device 67 is transmitted to the monitoring device 2 through a detour.

Next, switching to the detour will be explained using FIG. 4.

FIG. 4 shows details of switching to a detour, taking the exchange 14.11 in FIG. 2 as a representative example.

In the figure, reference numerals 110 to 115 are monitoring units that monitor the inside of each transmission device and, when an abnormality is detected, send out an abnormality signal as a monitoring signal.

Reference numerals 80 to 84 and 100 to 107 are insertion/separation units that insert or separate monitoring signals into the overhead area of a frame consisting of a synchronization signal area, an overhead area, and a signal area, and insertion/separation units 80. 83 determines that there is an abnormality in the transmission path when no frames are sent from the other party's transmission device in the time slot, and switches the switching device 93.94.
The transmission path is switched to a detour path.

In this case, the detour includes the insertion and separation sections 100 and 82, the protection line 33. It consists of insertion/separation sections 103 and 84 and a mesh transmission line 20.

Therefore, in FIG. 4, in the normal case, the transmission device 62.6
3 (both monitoring units are not shown), transmission device, and monitoring unit 11 at 52, 53, 51, 43, 44° 42
The monitoring signals at 4,115,113,111゜112.110 are sent to the monitoring station 1 via the insertion/separation unit 80 and the working line.
is being transmitted to.

Therefore, when the insertion/separation unit 80 detects an abnormality in the working line, the switching device 93 is switched from the solid line side to the dotted line side.

Then, the monitoring signals from the transmission devices 43.44, 51, 52.53 are transmitted to the monitoring station l via the detour.

Also, when an abnormality is detected in the working line between the transmission devices 41 and 45 or between the transmission devices 46 and 54, the monitoring signal transmitted via the mesh transmission path 20 is sent to the insertion and separation sections 84, 103, 8.
2,100 and is transmitted to the monitoring station l via the protection line 30.

In the case of FIG. 4, if the working line is abnormal, it is switched to a detour, so there is no particular need to switch to a protection line.

〔Effect of the invention〕

As explained in detail above, according to the present invention, even if the switching station is unable to transmit the monitoring signals of its own station and lower-level transmission equipment via the transmission line on the monitoring station L side, the monitoring signal is transmitted to the monitoring station via a detour. 1 has the effect of being able to transmit monitoring signals.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the principle of the present invention. Figure 2 is a block diagram showing the configuration of a monitoring signal network according to an embodiment of the present invention. Figure 3 is a detour route and a transmission route in the event of a failure in an embodiment of the present invention. FIG. 4 is a diagram showing details of switching to a detour according to an embodiment of the present invention, and FIG. 5 is a block diagram of a conventional supervisory signal system network. In the figure, ■ is a monitoring station, 2 is a monitoring device, lO~15.10'~15'' is a switching center, 20.21
30 to 35 are mesh transmission lines, 30 to 35 are backup transmission lines, 40 to 71 are transmission devices, 80 to 84, 100 to 107 are insertion/separation units 90 to 95 are switching devices, and 110 to 115 are monitoring units. 20.21 Maso Uni Ieyo Time 30-35 Preliminary 1 Tameya Route 90-95 k”l General 1 Principle of the Invention Pro-Tsuku Diagram No. 1

Claims (1)

[Claims] An exchange that transmits supervisory signals sent from lower-level exchanges to higher-level exchanges, with a supervisory station (1) that collects supervisory signals transmitted from each exchange as the apex. In a monitoring signal network connected in a tree shape using active and backup transmission lines, the lowest switching stations (10, 11, 12, 13) are connected by mesh transmission lines (20, 21), and the monitoring stations (1) and the monitoring station (1) via the lowest switching station (10, 11, 12, 13). 30, 32, mesh transmission line 21, backup transmission line 35, 31) backup transmission line 30,
33, mesh transmission line 20, backup transmission lines 34, 31), and each switching center (14, 15, 10, 11, 12, 13) is connected with a switching device (93, 90, 95, 94, 91, 92
), and in each exchange, when a fault is discovered in the transmission line on the monitoring station (1) side, the switching device switches the transmission of the monitoring signal to the detour route and transmits it to the monitoring station (1). A supervisory signal transmission method characterized in that: