JPH0215732A - Dama/scpc communication system - Google Patents

Abstract

PURPOSE:To individually perform maintenance of a slave station by the slave station alone by providing a switch which sets a junction cable trunk to a blocked state at every junction cable trunk of the slave station and sending a block signal to a master station when the trunk is set to the blocked state. CONSTITUTION:When the junction cable trunk 91a of a slave station 3a is blocked, its blocking switch 14a is set to a blocking side. A controller 101 sends a block signal indicating that the trunk 91a is blocked by utilizing a CCS line. Upon receiving the block signal, a master station 2 automatically deletes the information indicating that the junction cable trunk 91a of the slave station 3a is non-blocked from a station information group for line assignment. Moreover, maintenance of the trunk 91a, etc., is performed at the slave station 3a.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to satellite communication, in which one communication path is composed of one carrier.
DAM A (Demand A
5cpc communication method (hereinafter referred to as DAMA/
This is related to the SCPC communication method.

[Conventional technology]

FIG. 3 is a system configuration diagram showing a conventional DAMA/SCPC communication system, in which 1 is a communication satellite, 2 is a master station that executes communication path assignment, 3a, 3b, 3c, etc.
, 3n are slave stations that perform mutual communication using the communication path assigned by the master station 2.

FIG. 4 is a frequency allocation diagram showing an example of the arrangement of carrier waves (hereinafter referred to as 5cpc carriers) in a repeater (not shown) mounted on the communication satellite 1. In the figure, 4 indicates each slave station 3a from the master station.
, 3b.

Downlink common channel signal (hereinafter referred to as CCS) that sends call connection control signals to 3c, ----, 3n
nelSignaling) 5CPC carrier for the line, 5 is the 5CPC carrier for the uplink CC3 line that sends a line allocation request signal from each slave station 3a, 3b, 3c, ---, 3n to the master station 2, 6a, 6b6c, -----,
6n is assigned by the master station 2 and is assigned to the slave stations 3a, 3b, 3c.
, ----, 5 for communication path used for mutual communication between 3n
cpc carrier.

FIG. 5 is a block diagram showing an example of the device configuration of each slave station 30a, 3b, 3c, ---3n, where 7 indicates the exchange side,
8a, 8b, --- are trunk lines input from the exchange side 7, 9a, 9b- are trunks for accommodating the trunk lines 8a, ab, -1--, and 10 are trunk lines input from the exchange side 7. Slave stations 30a, 30b, 30cm--3n
a control device for controlling the trunk line trunks 9a, 9b;
, ---1, 5cpc carriers 6a, 6b for communication paths,
---A 5cpc transceiver 11a with a synthesizer.

11b, ---1 and a CCS signal transmitter/receiver 12 that uses 5 cpc for CCS lines. 13 is an intermediate frequency/high frequency device including an antenna.

Next, the operation will be explained. Taking as an example a case where trunk lines 1 to rank 9a of the slave station 3a are blocked, first, if the trunk line trunk 9a of the slave station 3a is blocked for some reason, the operator at the slave station 3a becomes the operator at the master station 2. By contacting, etc., the trunk line trunk 9 of the slave station 3a is established at the master station 2.
Recognizing the blockage of node a, the master station 2 manually selects the trunk trunk 9a of the slave station 3a from the line assignment control station information group in order to remove the trunk trunk 9a of the slave station 3a from line assignment control. Delete information indicating non-blocking. After performing the above deletion, maintenance of the trunk line trunk 9a of the slave station 3a is performed, or the trunk line trunk 9a is used outside the control of the master station 2. When this trunk line trunk 9a is restored, the trunk line trunk 9a of the slave station 3a is
In order to return a to the line allocation control target, information indicating that the corresponding trunk trunk 9a of the slave station 3a is not blocked is manually re-registered in the line allocation control information group.

(Problem to be Solved by the Invention) Since the conventional DAMA/SCPC communication system is configured as described above, when a trunk line is blocked, the line allocation station information group must be manually updated at the master station. There were problems such as maintenance being carried out by the slave station alone, and the slave station alone being unable to use the trunk line for communication with another system not under the control of the master station.

The present invention was made in order to solve the above problems, and the slave station uses the CC5 line to send a blocking signal to the master station, and the master station automatically updates the station information group for line assignment. DAMA/S allows the slave station to independently manage the maintenance status of the trunk trunk.
The purpose is to obtain a CPC communication system.

[Means to solve the problem]

In the DAMA/SCPC communication system according to the present invention, a switch is provided for each trunk of a slave station to set the trunk to a blocked state, and when this switch is set to a blocked state, the slave station communicates with the master station. transmits a blockage signal indicating that the trunk trunk is blocked using the CCS line, and the master station, which recognizes that the trunk trunk is blocked, automatically selects the slave station from the line allocation station information group. Information indicating that the corresponding trunk trunk is not blocked is deleted.

[Effect]

In this invention, when the switch of any trunk line is set to the blocked state, the slave station in this invention sends a blockage signal to the master station indicating that this trunk trunk is blocked, and the slave station alone enters the maintenance state. Starts communication with another system that is not under the control of the master station.

(Embodiment of the Invention) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The system configuration of an embodiment of this invention is the same as that shown in FIG.
FIG. 1 is a block diagram showing an example of the device configuration of slave stations 3a, 3b, --- in FIG. 3. In FIG. - is a trunk line, 1l
a11b, -1-- is a 5CPC transmitter/receiver having a synthesizer, 12 is a CCS signal transmitter/receiver, and 13 is an intermediate frequency/high frequency device, which are the same as those shown with the same reference numerals in FIG. 91a91b, ---- are trunk trunks equipped with blockage switches 14a, 14b, ---- as switches for setting the blockage state, 101 is a blockage switch 14a,
14b, ---1- reads the setting status, and if it detects that it is set to the blocked state, sends a blockage signal to the master station 2 indicating that trunk line trunk 91a91b--1 is blocked for CCS. This is a control device that causes the signal transmitter/receiver 12 to send out signals.

Next, the operation will be explained with reference to FIGS. 1 and 3. First, when the trunk trunk 91a of the slave station 3a is blocked, the blockage switch 14a is set to the blocked side. The control device 101 detects that the blocking switch 14a is set to the blocked state, and the CCSCC signal transmitter/receiver 12
A blockage signal indicating that the trunk trunk 91a is blocked is sent out using the CCS line. Next, the master station 2 receives this blocking signal and automatically deletes the information indicating that the trunk trunk 91a of the slave station 3a is not blocked from the line assignment station information group. Thereafter, the master station 2, which received a line assignment request signal from another slave station 3b via the CCS line, recognizes from the line assignment station information group that the trunk line trunk 91a of the slave station 3a is blocked. , and executes line allocation control excluding this trunk line trunk 91a. On the other hand, in the slave station 3a, the trunk line trunk 91
Maintenance etc. of a are carried out. Trunk line trunk 9 of slave station 3a
1a is completed and the blocking switch 14a is set to the non-blocking side, the control device 101 detects that the blocking switch is set to the non-blocking state, starts the CCS signal transmitter/receiver 12, A release signal indicating that the trunk trunk 91a has been unblocked is sent using the CC3 line. Then, the master station 2 receives this release signal and
Information indicating that the trunk trunk 91a of the slave station 3a is not blocked is automatically re-registered in the line assignment station information group, and the trunk trunk 91a of the slave station 3a is added to the target of line assignment control again. .

In addition, in the above embodiment, blockage switches 14a14b are installed in trunk line trunks 91a, 91b, etc.
, ---- are provided, but as shown in FIG. 2, PAMA switches 15a and l are used as switches for setting the closed state.
5b, ---- may be provided.

For example, a dedicated line (hereinafter referred to as PAMA) is a dedicated line (hereinafter referred to as PAMA) that uses the trunk line trunk 92a of the slave station 3a to perform communication with 1liil transmission of a predetermined frequency.
When performing communication (denoted as multiple 8 accesses), first, the PAM of the trunk line trunk 92a of the slave station 3a
When the A switch 15a is set to the PAMA side, the control device 102 detects the setting state of the PAMA switch 15a, activates the CCS signal transmission/reception $1112, and sends a blockage signal to the CC3 indicating that the trunk trunk 92a is blocked.
Transmit using the line. As described above, the master station 2 operates in the same manner as in the above embodiment, and the information indicating that the trunk line trunk 92a of the slave station 3a is not blocked is automatically deleted from the line-specific station information group. Thereafter, when the PAMA communication ends and the PAMA switch 15a is set to the non-PAMA side, the control device 102 detects the setting state of the PAMA switch 15a, activates the CCS signal transceiver 12, and The master station 2 operates in the same manner as in the above embodiment and confirms that the trunk trunk 92a of the slave station 3a is unblocked. The information shown is automatically re-registered in the line allocation station information group, and the trunk line trunk 92a of the slave station 3a is again added to the line allocation control target.

〔Effect of the invention〕

As described above, according to the present invention, the DAMA/5cpc communication method is implemented by providing a switch indicating blocking/non-blocking in the trunk of the slave station, respectively, and using the switch to indicate blocking/non-blocking.
The configuration is such that a signal indicating a non-blocked state is automatically sent to the master station, and the master station receives the signal and automatically excludes the corresponding trunk of the slave station from line allocation control. There is no longer a need for the operator of a slave station to notify the operator of the master station each time a trunk is blocked. It has an effect that can be used for system communication.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the device configuration of a slave station according to an embodiment of the present invention, FIG. 2 is a block diagram showing an example of the device configuration of a slave station according to another embodiment of the invention, and FIG. A system configuration diagram showing a conventional DAMA/SCPC communication method according to an embodiment of the invention, FIG. 4 is a frequency allocation diagram showing an example of the arrangement of 5 CPC carriers in a repeater mounted on a communication satellite, and FIG. A configuration diagram of a conventional device is shown. 1 is a communication satellite, 2 is a master station, 3a to 3n are slave stations, 91a,
91b, 92a, 92b are trunk line trunks, 101,1
02 is a control device, 11 is a 5cpc transceiver, 12 is a CC
S signal transmitter/receiver, 14a and 14b are block switches (switches), and 15a and +5b are PAMA switches (switches). In addition, in the figures, the same reference numerals indicate the same or equivalent parts. (2 others) Figure 1 11: 5CPC! 'fi Urfut14a, 1
4b: Blocking switch ÷ (swiss now → 91a, 91b: Medium M
! 1) Rank

Claims (1)

[Claims] It consists of one communication path and one carrier wave, and a large number of carrier waves are arranged in a repeater mounted on a communication satellite, and a common line line signal selected from the large number of carrier waves is used to connect a master station and a plurality of slave stations. A centralized control type D in which the master station centrally manages call connection control between the slave stations by performing call connection control between the slave stations.
In the AMA/SCPC communication system, a switch is provided for each trunk of the slave station to set the trunk of the slave station to a blocked state, and when this switch is set to the blocked state, the slave station connects to the master station. A blockage signal indicating that the trunk trunk is blocked is sent to the terminal using the common signal line, and on the other hand, when the master station receives the blockage signal, it controls the line allocation of the blocked trunk trunk. DAMA/S characterized by being excluded from the target of
CPC communication method.