JPH088522B2 - Satellite line individual line signal processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a satellite line that uses a common line signaling system as a relay line between existing exchanges that performs connection control using inter-station signals based on the individual line signaling system. The present invention relates to a satellite line individual line signal processing method applied to a demand assignment satellite communication method that is used by allocating each call.

In other words, while the existing exchange side adopts the individual line signal system, the satellite line side adopts the common line signal system, so it is necessary to perform some signal conversion between them. It can be said that it relates to a satellite line individual line signal processing system in the sense of processing individual line signals related to such signal conversion.

[Conventional technology]

A plurality of satellite earth stations, a satellite line established or released between the satellite earth stations, a satellite line control station,
Each satellite earth station sets and releases the satellite circuit according to a request from the satellite circuit control station, and the satellite circuit control station manages the satellite circuit. When connecting an existing exchange that adopts the above standard, it is necessary to set the satellite line between the constant exchange and the satellite line control station and send and receive control signals for each line. Since it is necessary to pull in the call line to the satellite line control station through the satellite line, the satellite line is held invalid even though the line is not used.

Therefore, in order to avoid this, in the demand assignment satellite communication system that allocates a satellite line between exchanges for each call, a dedicated control line is provided between the exchange and the satellite line control station, and the satellite line is connected through this control line. To do.

In order to realize this, it is necessary to provide a signal conversion device for converting a signal between an individual line signal and a common line signal between the existing exchange and the satellite earth station.

FIG. 4 is a block diagram showing such a signal conversion device. In the figure, 100 is the signal converter. The signal conversion device 100 includes an outgoing trunk 2 and an incoming trunk 3 for sending and receiving a supervisory signal to and from an existing exchange 1, a sender 4 and a register 5 for sending and receiving register signals such as dial signals, and a satellite earth station. 8 between the call line 7 and the call line 6 (outgoing trunk 2 and incoming trunk 3
Of the individual line signal between the switch 9 and the processor 11 (the output trunk 2, the input trunk 3, the sender 4 and the register 5 etc.) for connecting the register 5 and the input trunk 3 to each other. It includes a processor that performs transmission / reception, performs signal transmission / reception with the common line signaling device 10, and performs protocol conversion between the two), and this configuration is exactly the exchange itself, and it was a very expensive device. .

[Problems to be solved by the invention]

The present invention has been made in order to improve the cost of such a conventional signal conversion apparatus. Therefore, an object of the present invention is to provide a feature of a demand assignment satellite communication system for connecting a satellite line for each call. Taking advantage of the above, it is to provide a satellite line individual line signal processing system that enables the use of a signal converter having a simple structure and low cost.

[Means for solving problems]

To achieve the above object, the present invention comprises a plurality of satellite earth stations, a satellite line that is set or released between these satellite earth stations, and a satellite line control station, and each satellite earth station is In a communication network in which the satellite line control station sets up and releases the satellite line in response to a request from the satellite line control station, and the satellite line control station manages the satellite line, an existing exchange having an individual line signal function transmits an individual line signal to a common line signal. When connected to the satellite earth station having a common line signal function through a signal conversion device for converting to, the signal conversion device has only a supervisory signal transmission / reception function and a register signal transmission / reception function. This signal converter was not provided, but was provided on the satellite line control station side.

[Action]

The signal conversion device monitors the supervisory signal from the existing exchange and notifies the result to the satellite line control station via the satellite earth station, or gives a supervisory signal to the existing exchange by tracing the opposite route. Then, the satellite line control station side transmits and receives the register signal only when necessary through the satellite line which controls and sets the satellite earth station.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, 1a and 1b are existing exchanges and 14a and 14b, respectively.
Are signal converters, 8a, 8b and 8c are satellite earth stations, 15 are communication satellites, 16 are satellite line control stations, 4 are senders,
5 is a register, 9 is a switch, 10 is a common line signaling device, 11
Is a processor, 7 is a communication line, and 12 is a common control line.

It should be noted that while many satellite earth stations 8 are installed at various locations, one satellite line control station 16 is provided in common for all satellite earth stations.
16 is connected to the satellite earth station 8c through the communication line 7 and the common control line 12, but is also connected to other satellite earth stations through the communication line and the common control line which are not shown in the same manner. It goes without saying that the satellite earth station 8c is also connected to an existing exchange (not shown) via a signal converter (not shown).

FIG. 2 is a block diagram showing the details of the signal conversion device 14 in FIG. In FIG. 2, reference numeral 13 denotes a supervisory signal branching / inserting circuit. That is, the signal conversion device 14 has a simple structure including the add / drop circuit 13 and the common line signal device 10.

Since the supervisory signal is transmitted and received between the existing exchange 1 and the signal conversion device 14 as a pair with the call information of each call line, this supervisory signal is extracted by the branching / inserting circuit 13 in the case of transmission. It branches to the common line signaling device 10, and if there is an incoming call, the monitoring signal from the common line signaling device 10 is inserted into the communication line 6. In the common line signaling device 10, the monitoring signal branched from the branching / inserting circuit 13 is converted into a signal format to be placed on the common control line 12, and vice versa, monitoring is performed in the common line control format from the common control line 12. The signal is converted into the individual line signal format, sent to the add / drop circuit 13, and then inserted into the communication line 6.

Since the call information and the bit position of the monitor signal when transmitted on the communication line 6 are fixed, the branch / insert circuit 13 can branch / insert the monitor signal without requiring special judgment ability. The structure is simple.

In the conventional signal conversion apparatus shown in FIG. 4, the sender 4, the register 5, the outgoing trunk 2, the incoming trunk 3 and the like are included therein, whereas in the present invention, they are seen in FIG. As described above, the signal conversion device has only the branching / inserting circuit having the functions corresponding to the outgoing trunk 2 and the incoming trunk 3, and the sender 4 and the register 5 are controlled by the satellite circuit as shown in FIG. One set is installed in station 16. That is, while expensive devices such as the sender 4 and the register 5 are conventionally provided for each signal conversion device between each satellite earth station and the existing exchange, the present invention is common to all satellite earth stations. It will be understood that only one set is provided for the satellite circuit control station which exists only one in the above, and the cost can be reduced accordingly.

Please refer to FIG. 1 and FIG. 2 again. The supervisory signal on each call line 6 is sent to the common line signal device 10 in the signal conversion device 14.
The signal formation is converted by the communication line 7 and is transmitted / received to / from the satellite earth station 8 through a common control line 12 independent of the communication line 7. Further, the satellite line is connected between the satellite earth station 8 and the satellite line control station 16. It is always sent and received via the specific control line of.

On the other hand, the satellite line control station 16 includes a sender 4 and a register 5
Switch 9 is installed to connect to the call line 7, and the satellite line is set from the existing exchange to the satellite line control station via the satellite earth station on the existing exchange side and the satellite earth station on the satellite line control station side. Then, the register signal of the existing exchange 1 transmits / receives to / from the satellite line control station via the satellite line thus set.

FIG. 3 is a chart showing a connection procedure when a satellite line is allocated for each call between specific existing exchanges to make a call in the embodiment of the present invention shown in FIG.

 The connection operation will be described below with reference to FIG.

When the satellite line is selected by the existing exchange 1a, the call line 6 is connected and a start signal (monitoring signal) is transmitted to the signal conversion device 14a. The signal conversion transmission 14a transmits an activation signal (monitoring signal) to the satellite line control station 16 through a specific control line of the satellite line. The satellite line control station 16 returns a start-up completion signal (monitoring signal) to the existing exchange 1a through a specific control line of the satellite line and transmits a connection request signal for connecting the satellite line to the satellite earth station 8a. The satellite earth station 8a connects the satellite line to the signal conversion device 14a.
And connect to the satellite line control station 16.

As a result, the call line 6 of the existing exchange 1a is connected to the satellite line control station 16, and the KP signal indicating the start of transmission of the selection signal (register signal) is transmitted through the satellite line. The satellite line control station 16 controls the switch 9 and transmits the KP signal by connecting the call line 7 to the register 5, and then performs signal conversion through the common line signal device 10, the common control line 12, and the specific control line of the satellite line. Reception ready signal (monitoring signal) to the device 14a
To send. The signal converter 14 relays the supervisory signal.
When the existing exchange 1a receives the reception preparation completion signal (monitoring signal), it transmits a selection signal (register signal).

When the satellite line control station 16 receives the selection signal (register signal) on the same route as the KP signal, it performs number analysis, selects the existing exchange 1b to be connected, and transmits a connection request signal to the satellite earth station 8b. Satellite line control station 16 and existing exchange 1b
Connect a free satellite line between.

After that, the selection signal (register signal) is transmitted to the existing exchange 1b by the same procedure as the procedure transmitted and received between the existing exchange 1a and the satellite circuit control station 16. After transmission, satellite earth station 8a,
The connection switching signal is transmitted to 8b to release the satellite line between the existing exchanges 1a, 1b and the satellite line control station 16 and at the same time, connect the satellite line between the existing exchanges 1a, 1b. This enables a call between the existing exchanges 1a and 1b.

By directly transmitting / receiving the register signal to / from the satellite line control station 16 as described above, the sender 4 and the register 5 of the satellite line control station 16 can be shared by all the existing exchanges 1. Required sender 4,
It becomes possible to eliminate the register 5, the switch 9, and the processor 11.

〔The invention's effect〕

As described above, in the demand-assignment satellite communication system in which the satellite circuit is connected between the existing exchanges for each call, the minimum and only device configuration of the branch / insert circuit of the supervisory signal and the common line signal device is used as the signal conversion device. This makes it possible to economically apply a satellite line as a trunk line of an existing exchange. In addition, the satellite line control station requires devices such as senders, registers, and switches necessary for transmitting and receiving register signals. Since this device configuration is the same as that of the existing repeater exchange, the hardware of the satellite line control station is It is possible to use most of the software. Therefore, the satellite line control station can be economically constructed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing details of the signal conversion apparatus in FIG. 1,
FIG. 3 is a chart showing a connection procedure in one embodiment of the present invention, and FIG. 4 is a block diagram showing a signal conversion device according to the prior art. Explanation of symbols 1 ... Existing exchange, 2 ... Outgoing trunk, 3 ... Incoming trunk, 4 ... Sender, 5 ... Register, 6 ... Call line (with monitor signal), 7 ... Call line (monitor signal) None), 8
...... Satellite earth station, 9 ...... Switch, 10 …… Common line signal device, 11 …… Processor, 12 …… Common control line, 13 …… Branch / insert circuit, 14 …… Signal converter, 15 …… Communication Satellite, 16
...... Satellite line control station, 100 …… Conventional signal converter

Claims (1)

[Claims] 1. A satellite earth station comprising a plurality of satellite earth stations, a satellite line established or released between the satellite earth stations, and a satellite line control station, each satellite earth station being from the satellite line control station. The satellite line is set up and released at the request of
The satellite line control station is a communication network that manages satellite lines, and an existing exchange that has individual line signal functions uses the signal conversion device that converts individual line signals to common line signals to provide the satellite that has common line signal functions. When connected to the earth station, the signal conversion device monitors the supervisory signal from the existing exchange and notifies the result to the satellite circuit control station via the satellite earth station, or vice versa. The existing switching system is provided with only the function of giving a supervisory signal to the existing switching system, and the function of transmitting / receiving a register signal to / from the existing switching system is provided not to the signal conversion device but to the satellite circuit control station side. A satellite line individual line signal processing method characterized in that the line control station controls the satellite earth station to transmit and receive via a satellite line.