JPH01120919A - Dama communication equipment - Google Patents

Abstract

PURPOSE:To easily build up a measuring function of the level margin at a master station by adopting the constitution such that a self-diagnostic test signal whose level is lowered is sent to an idle channel, the signal is received after one slot and the difference between the received signal pattern and the signal pattern at the transmission is checked. CONSTITUTION:A level margin measuring function is added to the master station. That is, an SCPC transmitter-receiver 1 allows a transmitter-receiver control circuit 4 to send a self-diagnostic test signal X whose level is decreased to a channel whose line is not assigned by the operator command to the self-diagnostic signal transmitter- receiver circuit 3 based on the control signal from a system controller 9 to store the transmission pattern. In sending the self-diagnostic test signal whose level is decreased to a slave station via a repeater, the master station applies the reception processing of the self-diagnostic test signal by the control of the transmitter-receiver control circuit 4. The self-diagnostic signal transmitter-receiver circuit 3 checks both the patterns of the transmission signal X and the reception signal Y by the control of the transmitter-receiver circuit 4, and when they are identical, it is decided that the reception level is within a limit, and if they differ from each other, it is informed to the operator as the excess of the level margin.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is based on DAMA (Demand Assi
The present invention relates to a DAMA communication device that makes it possible to easily construct a level margin measurement function of a master station of a satellite communication system based on the GnedMultiple Access (GnedMultiple Access) method.

[Conventional technology]

The DAMA system is an S
CP C (Single Channel Per C)
In the 5CPC system, which allows a large number of SCPC carriers to be placed in repeaters of communication satellites, one master station and many slave stations are installed, and one or more SCPC carriers are used to control call connections between the master station and slave stations. common line signal (CCS) for
=Com+++on Channel Signal
ing) line, and the remaining carriers as communication paths, and when connecting between any slave stations, the master station uses the CC3li51 line to receive a line allocation request from the calling slave station, and when the master station accepts, it selects an idle one from the communication paths. This is a centralized control request line allocation method in which call connection control between slave stations is centrally managed by a master station, instructing the calling slave station via ○C3 to perform communication.

Figure 3 is a configuration diagram of a conventional DAMA communication device. In Figure 5, 1 is an SCPC in which one communication path is configured with one carrier.
Indicates a transmitting/receiving device, 2 is an SCPC transmitting/receiving circuit, 5 is an intermediate frequency/high frequency device including an antenna, 6 is a terminal device, and 7 is a common line signal (hereinafter referred to as “common line signal”).

CCS, Common Channel Sign
8 is a trunk line, C9 is a DAMA system control device that connects the exchange and the terminal equipment, and 10 is an exchange.

Next, the operation will be explained. When the signal transmitting/receiving device 7 for CC8 receives a [line allocation request signal] from the calling slave station using the CC8 line, the system controller 9 is notified, and the system controller 9 selects a free communication path and sends the C
A call is started by transmitting a "line assignment instruction signal" from the CS signal transmitting/receiving device 7, and by receiving the "line assignment instruction signal" from the master station by the calling slave station and the called slave station.

The 5CPC transmitting/receiving device 1 performs the operation of transmitting and receiving call signals, and when the call path is in an empty state, only transmitting and receiving carrier signals.

[Problem that the invention seeks to solve]

Since the conventional DAMA communication device is configured as described above, it does not have a function to measure the level margin at the master station, so a separate control device is required to measure the level margin, making the system complicated. Yuko's invention was made to solve the above-mentioned problems, and it is possible to send self-diagnosis signals of different levels from the master station to the idle communication path according to the operator's instructions. An object of the present invention is to obtain a DAMA communication device that can send out a test signal and automatically measure a level margin.

[Means for solving problems]

A DAMA communication device according to the present invention has a self-diagnostic signal transmitting/receiving circuit and a transmitting/receiving control circuit, and at the time of transmission, the transmitting/receiving control circuit causes a master station to send out self-diagnostic test signals of different levels to an idle communication path. An SCPC transmitting/receiving device is provided, and the self-diagnosis test signal is received via a repeater, and the signal at the time of transmission and reception is checked by the transmitting/receiving circuit (the self-diagnosis signal). It is.

(Function) The 5CPC transmitter/receiver according to the present invention transmits a self-diagnosis test signal whose level has been lowered from the self-diagnosis signal transmitter/receiver circuit to an idle communication channel under the control of the transmitter/receiver control circuit, and at this time, stores the signal pattern. Then, the self-diagnostic test signal is received in the same way as when transmitting, and the difference between the received signal pattern and the signal pattern stored at the time of transmission is detected by the self-diagnostic signal transmitting/receiving circuit under the control of the transmitting/receiving control circuit. Check the level margin of the master station.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, 1 is an SCPC transmitter/receiver, 2 is a 5CPC transmitter/receiver circuit that transmits and receives call signals, 3 is a self-diagnosis signal transmitter/receiver circuit that can transmit and receive a self-diagnosis test signal with a reduced level, and 4 is a transmitter of call signals. - A transmission/reception control circuit that controls reception and causes the self-diagnosis signal transmission/reception circuit to compare the transmission/reception patterns of self-diagnosis test signals; 9 is a 5Cpc in the SCPC transmission/reception device 1 when measuring the level margin according to an operator's instruction; Transmission/reception circuit 2. This is a system control device that transmits control signals to the self-diagnosis signal transmitting/receiving circuit 3 and the transmitting/receiving control circuit 4.

Further, 5 is an intermediate frequency/high frequency device including an antenna, 6 is a terminal device, 7 is a CC8 signal transmitting/receiving device, 8 is a trunk line connecting the exchange and the terminal device, and 9 is a control device for a DAMA system. and these are the same as in FIG.

Next, the operation will be explained. When the master station is in normal operation, S
The call signal from the CPC transmitter/receiver 1 is transferred to A- in FIG. 2(a).
It transmits at the timing of +B (call signal), then switches to receive mode and receives the call signal from the slave station as shown in Figure 2 (
It is received at the timing of B→A (call signal) in a).

By adding a level margin measurement function here, the system control device transmits a self-diagnosis test signal (X in Figure 2 (b)) with a reduced level to a communication path that has not been assigned one line according to the operator's instructions. Based on the control signal from 9, the transmission/reception control circuit 4 causes the self-diagnosis signal transmission/reception circuit 3 to transmit and store the transmission pattern.

Thereafter, when transmitting a call signal (self-diagnosis test signal) to the slave station via the repeater, the transmission/reception control circuit 4 controls the master station to process the reception of the self-diagnosis test signal (see Fig. 2). Perform Y) of b). Note that 11 in FIG. 2(b) indicates that reception processing Y is delayed by one slot because reception is performed via a repeater.

Through the above processing, the self-diagnostic signal transmitting/receiving circuit 3 checks the patterns of both the previously transmitted self-diagnostic test signal If it is different, the operator is notified that the level margin has been exceeded.

By changing the level of the self-diagnosis test signal, the operator can see the successively notified reception check results and learn the level margin of the master station.

In addition, although the self-diagnosis function was shown only in the master station in the above embodiment, it may be performed in the slave station.

Further, in the embodiment described above, a level margin measurement method using an idle communication channel was described, but a CC5 line may also be used, and the same effects as in the embodiment described above can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the self-diagnosis test signal whose level has been lowered is transmitted from the self-diagnosis signal transmission and reception circuit to the vacant communication path or the common line signal curve under the control of the transmission and reception control circuit, and at this time, the self-diagnosis test signal is transmitted. The pattern is memorized, and then a self-diagnosis test signal is received after one slot in the same way as when transmitting, and the difference between the received signal pattern and the signal pattern memorized at transmitting is controlled by the transmitting/receiving control circuit. Since the self-diagnosis signal transmission/reception circuit is configured to check the self-diagnosis signal transmission/reception circuit, a level margin measurement function can be easily constructed, maintenance functions are improved, and a highly reliable product can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a DAMA communication device according to an embodiment of the present invention, FIG. 2 is an operation time chart of a master station in the same embodiment, and FIG. 3 is a block diagram of a conventional DAMA device. 1 is an SCPC transmitting/receiving device, 2 is an SCPC transmitting/receiving circuit, 3
is a signal transmission/reception circuit for self-diagnosis, 4 is a transmission/reception control circuit, and 7 is a signal transmission/reception circuit for self-diagnosis.
9 is a signal transmitting/receiving device for CC8, and 9 is a system control device. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent Applicant: Mitsubishi Electric Corporation No. 1 Figure 1: 5CPC transmitting boar device 2', 5CPC road receiving stock route 3: Angular °C diagnosis code number: sending and receiving batch 4: sending and receiving system 10: Exchange group diagram 2

Claims (1)

[Claims] A large number of communication channels each consisting of one carrier are arranged in a repeater of a communication satellite, and one or more of the carriers of the communication channels are used to control call connections between a large number of slave stations and one master station. a common line signal line for use in communication, a communication path in which the remaining carriers other than the common line signal line among the carriers of the communication path are used for connection between the slave stations, and a calling unit among the plurality of slave stations. A signal transmitting/receiving device for common line signals receives a line allocation request signal from a station via the common line signal line, and when the signal transmitting/receiving device for common line signals receives the line allocation request signal, it selects an idle channel among the communication channels. a system control device that selects a communication path in a state and causes the signal transmission/reception device for common line signals to send a line allocation instruction signal to the calling sub-station and the called sub-station to initiate a communication between the two stations;
When measuring the level margin according to an operator's instruction, a control signal from the system control device sends a self-diagnosis test signal with a reduced level to the vacant communication channel or the common signal line via the repeater. A self-diagnosis signal transmitting/receiving circuit transmits the signal to the slave station, memorizes the transmission pattern at this time, and receives the same self-diagnosis test signal as at the time of this transmission; A DAMA comprising: a SCPC transmitting/receiving device including a transmitting/receiving control circuit that controls the transmission/reception of test signals for self-diagnosis, and causes the self-diagnosis signal transmitting/receiving circuit to compare the transmitting pattern and the receiving pattern.
Communication device.