JPS63169861A - Individual line signal converter - Google Patents

Abstract

PURPOSE:To preclude the possibility of timeout in a preceding exchange by returning a start end signal in receiving a start signal from an existing exchange network and sending the start signal converted into a common line signal form to a satellite line system so as to decrease the delay in start. CONSTITUTION:A start signal is transferred from an exchange 1 to an individual line signal converter 3 from an exchange 1 via a talking line 9. The individual line signal converter 3 transfers a supervisory signal (start signal) to a satellite line control station 8 transfers a start end signal to the exchange 1 via the talking line 9. The satellite line control station 8 receiving the supervisory signal (start signal) from the converter 3 via the satellite control line sends a command to an earth station 5 to connect the path of the satellite talking line 15 between the said satellite line control station 8 and the earth station 5 and when the bus connection is finished, the path from the exchange 1 to the satellite line control station 8 via the individual line signal converter 3 and the earth station 5 reaching the satellite line control station 8 as the channel (without supervisory signal).

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention receives an individual line signal from an existing exchange network that adopts an individual line signaling system, converts it into a common line signal, and then converts it into a common line signal. This invention relates to an individual line signal conversion device for outputting to a satellite line system that employs

In general, the signaling systems between exchanges are roughly divided into individual line signaling systems and common line signaling systems. Recent exchanges have adopted a common channel signaling method (a method in which a signal channel is provided in common to many information channels). Naturally, satellite lines also use a common channel signal system, so if you try to use a satellite line with an existing exchange, you won't be able to use it as is because the signal system will be different. Therefore, by converting the signal format using the above-mentioned individual line signal converter, it is possible to use the satellite line even from an existing exchange.

The present invention relates to such an individual line signal conversion device.

[Conventional technology]

FIG. 4 is a system configuration diagram of an exchange system using an individual line signal converter.

In the figure, 1 and 2 are existing exchanges that adopt the individual line signaling system, 3 and 4 are individual line signal converters, respectively.
5 and 6 are earth stations (which have the function of connecting and disconnecting satellite communication lines according to instructions from the satellite line control station), and 7 is a communication satellite (which relays and transfers signals between the earth station and the satellite line control station). 8 is a satellite line control station, 9.10 is a telephone line with a monitoring signal (individual line signal), and 11.12 is a register signal transfer and telephone call between the individual line signal converter and the earth station. 13.14 is a common control line for constantly transferring the monitoring signal converted into a common line signal, 15 is a satellite line as a call diagram ¥a (no monitoring signal), 16 is a monitoring signal. This is a satellite control line (satellite C5) for transmitting and receiving data to and from the satellite line control station.

FIG. 5 is a block diagram showing details of the individual line signal conversion device in FIG. 4.

In FIG. 5, reference numeral 17 denotes a supervisory signal insertion/removal unit having the function of inserting/removing only the supervisory signal (individual line signal) from the telephone line, and 18
19 is a supervisory signal transmitter that receives a supervisory signal; 20 is a supervisory signal receiver that detects a change in the supervisory signal from the supervisory signal receiver 18; A change signal transmitting/receiving unit having the function of editing a signal (monitoring signal) and sending it out, or converting a monitoring signal in a common line signal format into an individual line signal and sending it out; 21 denotes an individual line signal converter 3, 4; A link management section 22 has a function of monitoring the status of a link that transfers a monitoring signal between the satellite network control station 8 and the satellite line control station 8, and 22 is a control section that controls each section.

FIG. 6 is a flowchart showing a conventional connection procedure in the switching system as shown in FIGS. 4 and 5.

In FIG. 6, when the exchange 1 makes a call and sends out an activation signal (individual line signal format), the individual line signal converter 3 that receives this converts the activation signal into a common line signal format. Thereafter, it is sent to the satellite line control station 8 via the earth station 5 as a start signal (satellite C3). When receiving the activation completion signal (satellite C3) from the satellite line control station 8, the individual line signal converter 3 converts it into an individual line signal format and sends it to the exchange 1. Thereafter, the prescribed procedures proceed.

[Problem that the invention seeks to solve]

As described above, when a conventional individual line signal converter receives a start signal from an exchange, it transfers it to the satellite line control station via the earth station and satellite control line, and receives a start completion signal from the satellite line control station. Since the start-up completion signal is transferred to the preceding exchange 1 upon reception, the start-up delay (the individual line signal converter 3 receives the start signal from the exchange 1) is shorter than when using a terrestrial link instead of a satellite line. The delay in the time required to send the start-up completion signal to the exchange 1 after the start-up completion signal is sent is large, and as a result, the preceding switch 1 times out (the start-up completion signal does not return within a predetermined time, so recovery is not possible). The disadvantage is that it can sometimes lead to

Also, even if the satellite control line link is down, the individual line signal converter cannot send or receive signals to the satellite line control station, so the trunk marker sender in the preceding exchange is suspended. Another drawback was that normal trunks were blocked due to a startup failure, and the failure spread to the preceding exchange.

The purpose of the present invention is to prevent a timeout from occurring at startup in the upstream exchange even when a satellite line is used as a link, and even if the satellite control line link is down, a failure will spread to the upstream exchange. It is an object of the present invention to provide an individual line signal conversion device that does not cause such problems.

[Means for solving problems]

In order to achieve the above object, the present invention follows the configuration of the conventional individual line signal conversion device, but changes its operation mode.

[Effect]

In the present invention, when the individual line signal conversion device receives the activation signal in the form of an individual line signal from the existing exchange network, at that time, it returns the activation completion signal to the existing exchange network, and
An activation signal converted into a common line signal format is sent to the satellite line system.

〔Example〕

FIG. 1 is a flowchart showing the connection procedure when making a call when the present invention is implemented.

As is clear from comparing FIG. 1 with FIG. 6, when the individual line signal converter 3 receives a start signal in the form of an individual line signal from the existing exchange 1, it transmits the start completion signal to the existing exchange 1. It will be seen that at the same time, an activation signal (satellite C3) converted into a common line signal format is sent to the satellite line control station 8.

Hereinafter, the circuit operation when the present invention is implemented will be explained with reference to FIGS. 4 and 5 in addition to FIG. 1.

When a call is made, an activation signal (one of the monitoring signals) is transferred from the exchange 1 to the individual line signal converter 3 via the telephone line 9.

The transferred activation signal is extracted by the monitoring signal insertion/removal section 17 in the individual line signal conversion device 3 and transferred to the monitoring signal receiving section 18 .

The monitoring signal receiving unit 18 receives a start signal (
level change) is detected and transferred to the change signal transmitting/receiving section 20.

The change signal transmitting/receiving section 20 transmits the activation signal to the monitoring signal receiving section 18.
When the activation completion signal is received from the satellite line control station 8, it transfers the activation completion signal to the supervisory signal sending unit 19, and also sends it to the link management unit 21.
Request to transfer the monitoring signal (start signal) to.

The supervisory signal sending unit 19 that has received the startup completion signal transfers the startup completion signal from the supervisory signal insertion/removal unit 17 to the exchange l via the telephone line 9.

The satellite line control station 8 that has received the monitoring signal (activation signal) from the individual line signal converter 3 via the satellite control line changes the path of the satellite communication line 15 between the satellite line control station 8 and the earth station 5. An instruction is sent to the earth station 5 to connect the earth station 5, and when the path connection is completed, the satellite line is connected from the exchange 1 to the individual line signal converter 3 and the earth station 5 as a communication line (no monitoring signal). The path to the control station 8 is completed.

When the path is completed, switch 1 sends a register signal K.
The P-fold signal is transmitted and received by the satellite line control station 8, and based on this received signal, the satellite line control station 8 sends an ON signal as a monitoring signal to the individual line signal converter 3 via the satellite control line 16. Instructs to send a signal. Individual line signal converter 3
When the link management section 21 receives this transmission instruction signal, it transfers it to the change signal transmission/reception section 20.

The change signal transmission/reception unit 20 translates the received ON transmission instruction signal and instructs the monitoring signal transmission unit 19 to transmit an ON signal. The supervisory signal sending unit 19 transfers the ON signal to the exchange 1 via the supervisory signal insertion/removal unit 17 and the telephone line 9.

Upon receiving the ON signal, the exchange 1 transfers the selected number signal, which is a register signal, to the satellite line control station 8 via the communication lines 9, 11.15. In this way, the individual line signal converter 3 autonomously returns the activation completion signal to the originating exchange only when receiving the activation signal, and relays and transfers all other signals to the satellite line control station 8.

FIG. 2 is a flowchart showing the procedure for issuing a personal line call in the event of a link failure when using the individual line signal converter according to the present invention.

Hereinafter, the circuit operation will be explained with reference to FIG. 4 and FIG. 5 in addition to FIG. 2.

As in the case of FIG. 1, when a call is made, an activation signal (one of the monitoring signals) is transferred from the exchange 1 to the individual line signal converter 3 via the telephone line 9. The transferred activation signal is extracted by the monitoring signal insertion/removal section 17 in the individual line signal conversion device 3 and transferred to the monitoring signal receiving section 18 . The supervisory signal receiving section 18 detects an activation signal (level change) as a supervisory signal and transfers it to the change signal transmitting/receiving section 20 .

The change signal transmitting/receiving section 20 transmits the activation signal to the monitoring signal receiving section 18.
When the activation completion signal is received from the satellite line control station 8, it transfers the activation completion signal to the supervisory signal sending unit 19, and also sends it to the link management unit 21.
Request to transfer the monitoring signal (start signal) to.

The supervisory signal sending unit 19 that has received the startup completion signal transfers the startup completion signal from the supervisory signal insertion/removal unit 17 to the exchange 1 via the telephone line 9. The exchange 1, which has received the start-up completion signal, hunts the MF sender, which is a common device, to send the selected digits.

On the other hand, when the link management unit 21, which has been requested to transfer the activation signal to the satellite line control station 8, detects a link disconnection at this point, it notifies the control unit 22 of the link disconnection detection.

The control unit 22 that has received the notification transfers the ON signal to the change signal transmitting and receiving unit 20 at the appropriate timing.
instructs the supervisory signal transmitting unit 19 to send an ON signal, and the supervisory signal transmitting unit 19 connects the exchange l via the supervisory signal insertion/removal unit 17.
The ON signal, which is a monitoring signal, is transferred to.

When the exchange 1 receives the ON signal, it sends out a selection number signal, which is a register signal, and releases the MF sender upon completion of the selection number signal. However, this selection number signal is not connected to the satellite line control station 8, so it is not received. Thereafter, the control unit 22 of the individual line signal conversion device 3 continues monitoring until a disconnection signal, which is a monitoring signal, is transferred from the exchange 1, and when the disconnection signal is transferred, it assumes an idle state and ends the operation.

FIG. 3 is a flowchart showing a procedure for blocking an idle line when using the individual line signal conversion device according to the present invention.

Hereinafter, the circuit operation will be explained with reference to FIG. 4 and FIG. 5 in addition to FIG. 3.

The link management unit 21 of the individual line signal conversion device 3 detects link disconnection and transfers link disconnection information to the control unit 22. The control section 22 searches for all vacant incoming lines based on the line data in the control section, and transfers a subsequent blocking signal to the change signal transmission/reception section 20 for all the searched lines.

The change signal transmitting/receiving unit 20 instructs the supervisory signal transmitting unit 19 to block the rear position, and the supervisory signal transmitting unit 19 transfers the rearward blockage signal, which is a supervisory signal, to the exchange 1 via the supervisory signal insertion/removal unit 17. When the exchange 1 receives the subsequent blocking signal, it blocks the line and thereafter stops requesting connection of calls to the individual line signal converter 3 for the route.

Further, when a link connection is detected, the link management section 21 of the individual line signal conversion device 3 performs an operation opposite to the above operation, detects the link connection, and transfers the link connection information to the control section 22. Regulation? 1122 searches for all vacant incoming lines based on the line data in the control unit, and transfers block release signals to the change signal transmission/reception unit 20 for all the searched lines.

The change signal transmitting/receiving unit 20 instructs the supervisory signal transmitting unit 19 to release the blockage, and the supervisory signal transmitting unit 19 transfers the blockage release signal, which is a supervisory signal, to the exchange 1 via the supervisory signal insertion/removal unit 17. When the exchange 1 receives the block release signal, it sets the line to an idle state and thereafter resumes requesting connection of the route to the individual line signal converter 3.

〔Effect of the invention〕

As explained above, according to the present invention, the individual line signal converter autonomously sends the activation completion signal back to the exchange when receiving the activation signal from the exchange, so the activation delay can be reduced and the timeout in the preceding exchange can be reduced. The advantage is that there is no fear.

In addition, in the event of a link failure, it detects it and autonomously sends out an individual line signal, performs processing to drain the line in use to the opposite exchange, and blocks the idle line. Therefore, there is an advantage that failures in the satellite line system do not spread to the exchange side.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the connection procedure when making a call when the present invention is implemented, and FIG. 3 is a flowchart showing the procedure for blocking an idle line when using the individual line signal converter according to the present invention, FIG. 4 is a system configuration diagram of a switching system using the individual line signal converter, and FIG. FIG. 6 is a block diagram showing details of the individual line signal conversion device in FIG. 6, and FIG. 6 is a flowchart showing the conventional connection procedure. Explanation of symbols 1, 2...Switchboard, 3, 4...Individual line signal converter, 5.6...Earth station, 7...Communication satellite, 8...Satellite line control station, 9. 10...Telephone line (with monitoring signal), 11.12...Telephone line (without monitoring signal), 13
．． 14... Common control line, 15... Satellite call line,
16... Satellite control line (satellite C3), 17... Monitoring signal insertion/removal unit, 18... Monitoring signal receiving unit, 19... Monitoring signal transmitting unit, 20... Change signal transmitting/receiving unit, 21 ...
Link Management Department, 22... Control Department Agent Patent Attorney Akio Namiki Agent Patent Attorney Kiyoshi Matsuzaki Ji1rg 112! ! ll

Claims (1)

[Claims] 1) An individual line that receives an individual line signal from an existing exchange network that uses an individual line signaling system, converts it into a common line signal, and then outputs it to a satellite line system that uses a common line signaling system. When the signal converter receives the activation signal in the individual line signal format from the existing exchange network, it sends the activation completion signal back to the existing exchange network at that point, and also sends the activation signal converted to the common line signal format to the satellite line system. An individual line signal conversion device characterized by transmitting a start signal. 2) The individual line signal conversion device according to claim 1, further comprising link down detection means for the satellite control line in the satellite line system, and when detecting the link down, performs necessary individual line signal conversion between the satellite control line and the existing exchange network. An individual line signal conversion device characterized by transmitting and receiving line signals. 3) The individual line signal converter according to claim 1, further comprising link down detection means for the satellite control line in the satellite line system, and when detecting the link down, An individual line signal conversion device characterized by blocking an idle line.