JPS60201752A - Exchange system using satellite - Google Patents

Abstract

PURPOSE:To detect a fault of a master station including a satellite circuit by providing an independent monitor device and an artificial slave station outside the master station, and forming a closed loop test route which is folded at the satellite among the monitor device, the master station, the satellite and the artificial slave station. CONSTITUTION:A satellite exchange system includes a switchboard 2 of master station, satellite 7, subscriber 4 of master station and a subscriber 9 of slave station. An external monitor device 13 of master station and an artificial slave station 10 are provided independently outside the switchboard 2. A monitor device 13 is provided with a selection signal generating circuit 14, selection signal receiving circuit 15, test signal receiving circuit 16, level measuring device 17, and a switch circuit 18, etc. The monitor circuit 13, the master station 1, the satellite 7 and the station 10 forms a closed loop test route which is folded at the satellite 10. In such constitution, the faults at the switchboard 2 of the station 1 including those at a satellite circuit are detected.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a switching system using a satellite, which has a function of monitoring abnormal operation of a master station, including a wireless device and a satellite line.

<Prior art> Conventionally, this type of satellite-based switching system had a monitoring circuit that could monitor only a single switch, but since the switch itself was monitored, an alarm signal was not generated when the system went down. There was a drawback that it was not possible to generate an alarm signal when there was no problem, or when there was an abnormality in the wireless equipment or satellite line.

<Object of the Invention> Therefore, an object of the present invention is to provide a switching system using a satellite that can detect not only a system failure of a master exchange, but also a failure of a wireless device and a satellite line. be.

<Structure of the Invention> The present invention provides an independent master station external monitoring device outside the master station, and connects a pseudo slave station to the wireless device of the master station external monitoring device, so that the master station external monitoring device can monitor the master station. Forming a closed-loop test path for switching back to the satellite with exchanges, master station radio equipment, antennas, satellites, antennas, radio equipment, pseudo-slave stations, and master station external monitoring equipment prevents not only the system failure of the master station exchange equipment but also , a wireless device and a satellite line, and the master station external monitoring device is connected to a trunk circuit for terrestrial line connection and a subscriber circuit of the pseudo slave station, respectively. a test signal generator that generates a test signal for performing a level test of a second interface; and a test signal generator that receives the test signal via a master station, a satellite, and a pseudo slave station;
A measuring device to measure the level and 1. An abnormality was found in the switch circuit that interconnects the second interface circuit, the selection signal generation circuit, the selection signal reception circuit, the test signal generator, and the level measuring device, the outgoing call connection, the incoming call connection, and It has an alarm circuit that sometimes displays an alarm, and a control circuit that controls a selection signal generation circuit, a selection signal reception circuit, a test signal generator, a level measuring device, a switch circuit, and an alarm circuit.

<Example> Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of an exchange system using a satellite according to an embodiment of the present invention.

The exchange system using this satellite is Sae-M7, Exchange@2
The master station 1 connects and receives signals from the accommodated master station subscriber 4 to the satellite 7 via the radio device 5 and the antenna 6 via the trunk circuit 8a for terrestrial line connection. It consists of a slave station 8 that connects the station subscriber 4 to the slave station subscriber 9, a pseudo slave station 10 connected to the wireless device 5 of the master station 1, and a master station external monitoring device 18.

The master station external monitoring device 18 is connected to the interface circuit 12 &
, an interface circuit 12b1 connected to the line circuit 11 of the pseudo slave station 10; a selection signal generation circuit 14 that generates a selection signal for performing outgoing call and incoming call connection tests;
, a selection signal receiving circuit 15 that receives this selection signal, a test signal generator 16 that generates a test signal for level testing the call line after the call is connected, and a level measuring device that receives this test signal and measures its level. 17, these selection signal generation circuit 14, selection signal reception circuit 15, test signal generator 1
6. Level measuring device 1? and interface circuit 121L,
12b, a clock circuit 20 for performing outgoing call connection, incoming call connection, and level testing at predetermined cycles, an alarm circuit 21 for displaying an alarm when an abnormality occurs during the test, and a selection signal generation circuit 14. , the selection signal receiving circuit 15, the test signal generator 16, the level measuring device 17, the switch circuit 18, and the alarm recirculation system will be explained.

(1) Explain the operation in the case of outgoing call connection test. Second
Diagram A shows the signal flow in this case.

The selection signal generation circuit 14 in the master station external monitoring device 18 is connected by the control circuit 19 via the switch circuit 18 to the interface circuit 12a, and therefore to the trunk circuit 8b for connecting the land line of the master station 1. Through this connection, a selection signal is sent to the exchange 2 of the master station 1. Based on this selection signal, the exchange 2 sends an incoming signal to the interface circuit 121 of the station number device 18 of the pseudo slave station 10 to the satellite 7 via the radio device 5 and antenna 6. The interface circuit 12b is connected to the switch circuit 18 by the control circuit 19 in advance.
The incoming signal is connected to the selection signal receiving circuit 15 via the selection signal receiving circuit 15, and this incoming signal is read by the selection signal receiving circuit 15. The above operation is activated many times by the clock circuit 20, and when the incoming signal from the pseudo slave station 10 is not received, the alarm circuit 21 is activated and an alarm is displayed.

(Sniff) Next, the operation when performing a level test of a connected communication path (by (1) outgoing call connection test) will be explained. FIG. 2B shows the signal flow in this case.

When the outgoing call connection test 111 is completed, the control circuit 19 controls the switch circuit 18 to connect the interface circuits 12a, 12b and the selection signal generation circuit 1 in FIG. 2A.
4. Disconnect each connection of the selection signal receiving circuit 15,
Instead, the test signal generator 16 is connected to the interface circuit 1Z&
Then, the level measuring device 17 is connected to the interface circuit 12. t)
Connect to each. The test signal generator 16 sends a test signal at a predetermined level to the satellite 7 via a switch circuit 18, an interface circuit 12as, a trunk circuit 3b1 for connecting to the ground line of the master station 1, an exchange 2, a radio device 5, and an antenna 6. Send. This test signal is sent via the satellite 7 to the antenna 01, wireless device 5, and pseudo slave station 10.
Interface circuit 121 connected to line circuit 11
), and the level of the test signal is measured by a level measuring device 17 connected via a switch circuit 18.

If the test signal is not at a specified level, the alarm circuit 21 is activated and an alarm is displayed.

[F] 1 Next, the operation in the case of an incoming call connection test will be explained. FIG. 8A shows the signal flow in this case. The control circuit 19 sends the signal to the interface circuit IZb via the switch circuit 18, and therefore to the line circuit 1 of the pseudo slave station IO.
Connected to 1.

Through this connection, a selection signal from the master station external monitoring device 18 is sent to the wireless device 5 of the master station I. This selection signal is transmitted to the antenna 6.
The signal is then sent to the satellite 7, looped back at the satellite 7, and sent again to the exchange 2 via the antenna 0 and the radio device 5. The exchange 2 analyzes the received selection signal and connects it to the trunk circuit 8b for connecting to the land line, which is the route to the master station external monitoring device 18.
Select the edges and connect. The incoming signal from the master station is transmitted from this trunk circuit 8b for connection to the land line to the master station external monitoring device 18.
interface circuit 12a. The interface circuit 12atl is connected to the selection signal receiving circuit 15 by the control circuit 19 via the switch circuit 18,
This incoming signal is read by the selection signal receiving circuit 15.

The above operation is started by the clock circuit 20 many times, and when the incoming signal from the master station l is not received, the alarm circuit 20
1 is activated and an alarm is displayed.

(2) Next, explain the operation when performing a level test of a connected communication path by a partner's incoming call connection test. The selection signal generation circuit 14 and the selection signal reception circuit 15 are disconnected, and instead the test drive signal generator 16t-interface circuit 1'2b and the level measuring device 17 are connected to the interface circuit 1B&. The test signal generator 16 is a switch circuit 18
, the interface circuit 12bs sends a test signal to the satellite 7 via the line circuit 11 of the pseudo slave station 10, the wireless device 5 of the master station 1, and the antenna 6. Is this test signal a satellite? The signal is returned to the master station 1 and sent to the master station external monitoring device 18 again via the antenna 6 of the master station 1, the radio equipment 5, the exchange 2, and the trunk circuit 8b for connection to the land line. Master station external monitoring device 1
At step 8, the test signals input to the interface circuit 11a are inputted by the control circuit 19 to the level measuring device 17 via the switch circuit 18, and the level is measured.

And if this test signal is not at the specified level,
The alarm circuit 21 is activated and an alarm is displayed.

<Effects of the Invention> According to the present invention, it is possible to detect not only a system failure of a master exchange, but also a failure of a wireless device and a satellite line.

[Brief explanation of the drawing]

Figure 2A is a diagram showing the signal flow in the case of an outgoing call connection test, Figure 2B is a diagram showing the signal flow in the case of a channel level test after the outgoing call connection test, and Figure 8A is a diagram showing the signal flow in the case of an incoming call connection test. FIG. 8B is a diagram showing the signal flow in the case of a trial drive, and FIG. 8B is a diagram showing the signal flow in the case of the level test of the communication path after the incoming call connection test. to the master station, 2: exchange + 3 a * 3 b: l rank circuit for terrestrial line connection, 4 = master station subscriber, 5: radio equipment, 6: antenna, ? = satellite, 8: slave station, 9: slave station subscriber, 10: pseudo slave station, 11 two-line circuit. 12a+12b: interface circuit, 18: master station external monitoring device, 14: selection signal generation circuit, 15: selection signal reception circuit, 16: trial grain signal generator. 17=level measuring device, 18: switch circuit, 19: control circuit, 20 two-clock circuit, 21=alarm circuit. Patent applicant: NEC Corporation NEC Engineering Co., Ltd.

Claims (1)

[Scope of Claims] In a switching system using a satellite, a pseudo slave station connected to a wireless device of a master station consisting of an exchange, a trunk circuit for connecting to a terrestrial line, a wireless device, and an antenna, and a trunk for connecting to a terrestrial line. circuit and a first. a second interface circuit; a test signal generator that generates a test signal for testing the level of a communication line during call connection; and a test signal generator that receives the test signal via the master station, satellite, or pseudo slave station, a measuring device for measuring the level; a second interface circuit, a selection signal generation circuit, a selection signal reception circuit, a test signal generator,
a switch circuit that interconnects the level measuring device; an alarm circuit that displays an alarm when an abnormality is detected during the outgoing call connection, incoming call connection, and level test; and a selection signal generation circuit and selection signal reception circuit. 1. An exchange system using a satellite, comprising a master station monitoring device having a control circuit for controlling a circuit, a test signal generator, a level measuring device, a switch circuit, and an alarm circuit.