JPH03201748A - Remote maintenance and management system - Google Patents

Abstract

PURPOSE:To reduce the hardware of a loop management equipment and to simplify the software by allowing the loop management equipment to connect an adaptor of a connected station and an adaptor of an independent station at a line at the outside of the loop when the independent station and the loop management equipment are connected. CONSTITUTION:When a CPU 220 of an adaptor 33 of an independent station 23 detects it that the station now in use is independent, the CPU sends a command automatically to a call control circuit 290 to send a call to a line 100 at the outside of the loop. When an adaptor 32 to which a loop management equipment 50 is connected and the line 100 at the outside of the loop are connected, a line switch 300 is thrown to the position of a MODEM circuit 280 to start the communication via the loop management equipment 50 and the MODEM circuit 280. Thus, the hardware of the loop management equipment is reduced and the software is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a remote maintenance management system for a communication system in which a plurality of stations are connected through a loop-shaped transmission path.

(Prior Art) Conventionally, loop-shaped networks often have a double-loop structure to ensure reliability. FIG. 3 shows the configuration of such a loop-like network, with stations 21 and 22
, 23.24 are transmission lines 01, 02, 03.04, respectively.
and are connected by a double loop of transmission lines 11, 12.1314. This is to avoid communication at an abnormal location and prevent the system from stopping by reconfiguring the loop by switching the loop system and looping back as shown in FIGS. 3 and 4.

However, for example, if a station 23 in a certain network is repeatedly disconnected from the loop as shown in FIG. 4, it becomes impossible to communicate with the disconnected station 23. For this reason,
It is impossible to collect data from an abnormal station in order to investigate the cause or perform restart processing from a remote loop management device.

Therefore, a communication path connecting the loop management station and the isolated station is required in addition to the loop transmission path. In this case, another communication path may be, for example, a telephone line of a public network, and it is necessary to connect each station to a line outside the loop.

When connecting the adapter device and the loop management device using four wires outside the loop, first, a method of directly connecting the line outside the loop to the loop management device can be considered.

However, in this case, the loop control device requires input/output from another line in addition to the normally used transmission line with the station. Therefore, the hardware cost of the loop management device is enormous and the processing becomes complicated.

(Problem to be Solved by the Invention) As mentioned above, in a network where multiple stations are connected by a double loop, when a remote loop management device is connected to a station that has been disconnected due to an abnormality, it may become isolated. If the station's adapter device and loop management device are directly connected via an external line, the loop management device will require input/output from another line in addition to the normally used transmission line with the station, which will increase hardware costs. This is not appropriate considering the complexity of processing.

An object of the present invention is to reduce the hardware and simplify the software of a loop management device.

[The structure of invention! li,] (Means for Solving the Problems) A remote maintenance management system of the present invention that achieves the above-mentioned conventional object has a plurality of stations connected by a double loop transmission path, and one station that performs loop management. In the communication system to which the device is connected, it is connected to the control unit of each station, it is possible to control the control unit by exchanging commands with the control unit, and it is also possible to exchange data with the control unit, and If each station is equipped with an adapter device that can be connected to a line network, and there is an isolated station that is disconnected from the loop, the adapter device connected to the isolated station is connected to the adapter device of the station to which the loop management device is connected. an adapter for connecting to a device or for a station to which said loop management device is connected;

The isolated station is controlled by the loop management device by connecting the device to the isolated station using a line outside the loop.

(Function) When connecting an isolated station and a loop management device in this way, by connecting the adapter device of the station to which the loop management device is connected and the adapter device of the isolated station using a line outside the loop,
There is no need to directly connect lines outside the loop to the loop management device, and the hardware and software of the loop management device can be reduced and simplified.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an overview of a remote maintenance management system according to an embodiment of the present invention. 01, 02.03, 04 and 11.12.
13.14 is the transmission line, 21, 22° 23.24 is the loop station, 31, 32, 33.34 is the station 21 to 24, respectively.
1 is an adapter device connected to a loop management device 50;
00 is a line outside the loop.

Normally, stations 21, 2 are connected by loop transmission lines 01, 02, 0-3.04 and loop transmission lines 11, 12, 13.14.
2.23.24 are connected, but for example, as shown in the diagram, station 23 is abnormal or transmission line 02.12, 03, 13
If the station 23 is isolated due to an abnormality, the adapter device 33 of the station 23 communicates with the loop management device 50 via the line 100 outside the loop. FIG. 2 shows representative configurations of the loop station 21 and the adapter device 31. Note that the other stations 22, 23, 24 and adapter devices 32, 33, and 34 have similar configurations.

The station 21 includes a loop interface section 115, transmission signal conversion sections 101, 102, 111, 112, and a CP of a station control section.
U120, station control unit buffer l50, station control unit 5I
0160. In addition, the adapter device 31 connects the 5I0 of the CPU 2201 buffer 2501 station side.
260. It is composed of 5IO 270 on the line side, a modem circuit 2801, a call control circuit 290, and a telephone line switch 300.

Between the stations of the loop, there is usually a loop interface section 115,
The transmission signal converters 101 to 112 communicate with each other through the transmission path, and the loop management device 50 is connected to a certain station.
Communication with the network also uses a loop transmission path. However, if a station is isolated, it is impossible to communicate with the loop management device 50 using a transmission path.

In this case, first, the CPU 20 of the station control unit and the CPU 220 of the adapter devices 31 to 34 transfer the 5IO 160,
260 communication.

Next, processing when a station becomes isolated will be explained.

When the CPU 220 of the adapter device 33 of the isolated station 23 detects that its own station is isolated, the CPU 220 automatically switches the call control circuit 2
90 to make a call to the line 100 outside the loop. When the adapter device 32 to which the loop management device 50 is connected is connected to the line 100 outside the loop, the line switch 300 is switched to the modem circuit 280 side, and communication via the loop management device 50 and the modem circuit 280 is started. . When disconnecting the line, a disconnection command from the loop management device 50 is sent to the adapter device 32 of the station 22.
It is human-powered and buckets are sent through line 100!・Isolated station 2
3 into the adapter device 33 of No. 3. Adapter device 33 interprets the packet received through modem circuit 280, and CPU 220 issues a command to call control circuit 290.

As a result, the call control circuit 290 lengthens the command and disconnects the line.

Further, when the loop management device 50 discovers an isolated station, the adapter device 32 of the station 22 to which the loop management device 50 is connected makes a call and connects to the adapter device 33 of the isolated station 23 .

Typically, when a call is not connected, the line switch 300
is connected to the call control circuit 290, and switches the line switch 300 when there is an incoming call.

[Effects of the Invention] As explained above, according to the present invention, there is no need for the loop management device to directly connect the telephone line, and the loop management device does not need to connect the telephone line directly to the telephone line by the adapter device of the station connected to the loop management device and the adapter device of the isolated station. The connection allows for loop management equipment and isolated station connections. This makes it possible to reduce the hardware and simplify the software of the loop management device.

[Brief Description of the Drawings] Figure m1 is a configuration diagram of a loop network to which an embodiment of the present invention is applied, Figure 2 is a block diagram showing the configuration of a station and an adapter device, and Figure 3 is a configuration of a conventional loop network. 4 are diagrams showing a loopback state when an isolated station occurs. 01~04.11~14...Transmission line, 21~24...
- Stations, 31-34...Adapter device, 50...Loop management device, 100...Line outside the loop, 101-1
12... Transmission signal conversion section, 115... Loop interface section, 120, 220... CPU, 150°2
50...buffer, 160,260,270...S
10.280...Modem circuit, 290...Call control circuit, 300...Line switch.

Claims (1)

[Claims] In a communication system in which a plurality of stations are connected by a double-loop transmission path and a loop management device is connected to one of the stations, the system is connected to a control unit of each station and exchanges commands with the control unit. Each station is equipped with a line adapter device outside the loop that can control the control unit through communication and exchange data with the control unit, and if there is an isolated station separated from the loop, the isolated station The adapter device connected to the loop management device is connected to the adapter device of the station connected to the loop management device, and the adapter device of the station connected to the loop management device is connected to the isolated station using a line outside the loop. A remote maintenance management system, characterized in that isolated station control is performed from the loop management device by connecting to the loop management device.