JP2548156B2 - Individual line signal converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention receives an individual line signal from an existing exchange network adopting an individual line signal system, converts the individual line signal into a common line signal, and
The present invention relates to an individual line signal conversion device for outputting to a satellite line system adopting a common line signal system.

Generally, the signaling systems between the exchanges are roughly divided into individual line signaling and common line signaling. In existing exchanges (for example, crossbar exchanges, etc.), individual line signaling (signal channels are provided individually for each information channel). In recent exchanges, a common line signal system (a system in which a signal channel is commonly provided for many information channels) is adopted. Naturally, the satellite line also uses the common line signal system. Therefore, if the existing exchange tries to use the satellite line, the signal system is different and cannot be used as it is. Therefore, by converting the signal format using the above-mentioned individual line signal conversion device, it is possible to use the satellite line even from the 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 the individual line signal conversion device.

In the figure, 1 and 2 are existing exchanges that use individual line signal systems, 3 and 4 are individual line signal converters, and 5, 6
Is an earth station (with the function of connecting and disconnecting the satellite passage line according to the instruction of the satellite line control station), and 7 is a communication satellite (having a function of relaying and transferring signals between the earth station and the satellite line control station) ), 8 is a satellite line control station, 9 and 10 are call lines with supervisory signals (individual line signals), 11 and 12 are for transferring register signals between the individual line signal converter and the earth station, and for making calls. Call line, 13 and 14 are common control circuits for constantly transferring the supervisory signals converted into common line signals, 15 is a satellite line as a call line (no supervisory signal), 16 is a satellite line control station It is a satellite control line (satellite CS) for sending and receiving between.

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

In FIG. 5, 17 is a supervisory signal insertion / removal unit having a function of inserting / removing a supervisory signal (individual line signal) from the communication line, 18 is a supervisory signal receiving unit for receiving the supervisory signal, 19 is a supervisory signal sending unit, Reference numeral 20 detects a change in the supervisory signal from the supervisory signal receiver 18, and if it is a supervisory signal in the individual line signal format, edits it into a common line signal (supervisor signal) and sends it out. If it is a monitoring signal to be taken, a change signal transmission / reception unit having a function of converting it to an individual line signal and transmitting it, 21 is an individual line signal conversion device
A link management unit 22 has a function of monitoring the state of a link for transmitting a monitoring signal between the satellite communication control station 8 and the satellite circuit control station 8, and a control unit 22 controls each unit.

FIG. 6 is a flow chart showing a connection procedure conventionally used in the switching system as shown in FIGS. 4 and 5.

In FIG. 6, when the exchange 1 makes a call and sends out a start signal (individual line signal format), the individual line signal conversion device 3 receiving this signal converts the start signal into the common line signal format. After that, it is sent to the satellite line control station 8 via the earth station 5 as a start signal (satellite CS). When the activation completion signal (satellite CS) is received from the satellite line control station 8, the individual line signal conversion device 3 converts it into the individual line signal format and sends it to the exchange 1. Hereinafter, a predetermined procedure proceeds.

[Problems to be solved by the invention]

As described above, the conventional individual line signal conversion device, when receiving the activation signal from the exchange, transfers it to the satellite line control station via the earth station and the satellite control line, and sends the activation completion signal from the satellite line control station. Since the start-up completion signal is transferred to the preceding exchange 1 at the time of reception, the start-up delay (the individual line signal conversion device 3 receives the start-up signal from the exchange 1) as compared with the case of using a terrestrial link instead of the satellite line. After that, the delay in the time required to send the activation completion signal to the exchange 1) is large, and as a result, the preceding exchange 1 has timed out (the activation completion signal does not return within a predetermined time, so restoration is possible). There is a drawback that it may happen).

Even if the satellite control line link is down, the individual line signal converter cannot send or receive signals to or from the satellite line control station, so the transformer marker sender in the preceding exchange is held invalid. Moreover, there is a drawback that normal trunks are blocked by the start-up failure and the failure spreads to the preceding exchange.

The object of the present invention is to prevent the timeout from occurring at startup in the preceding exchange even when the satellite line is used as a link, and to propagate the fault to the preceding exchange even when the link of the satellite control line is down. It is to provide an individual line signal converter so as not to do so.

[Means for solving problems]

To achieve the above object, in the present invention, an individual line signal is received from an existing exchange network adopting the individual line signal system, converted into a common line signal, and then outputted to a satellite line system adopting the common line signal system. In the individual line signal conversion device, a supervisory signal inserting / removing unit that inserts / extracts only a supervisory signal, which is one of the individual line signals, from the existing communication network on the exchange network side, a supervisory signal receiving unit, and a supervisory signal sending unit. A change signal transmission / reception unit, a link management unit that monitors the state of the link that transfers the monitoring signal to the satellite line system, and a control unit.

[Action]

In such an individual line signal converter, when a start signal, which is one of the monitor signals, is transferred from the existing exchange through the telephone line at the time of making a call, the monitor signal inserting / removing unit takes out the start signal and receives the monitor signal. And the supervisory signal receiver,
The activation signal is detected and transferred to the change signal transmission / reception unit. When the change signal transmission / reception unit receives the transferred activation signal, the change signal transmission / reception unit transfers the activation completion signal to the supervisory signal transmission unit and also to the link management unit to the satellite. Ask the line system to transfer the start signal as a common line signal.

On the other hand, the supervisory signal transmission unit that has received the start-up completion signal transfers the start-up completion signal from the supervisory signal insertion / removal unit to the originating exchange through the telephone line, and transfers the start-up signal to the local area and satellite line system. When the link management unit is requested to detect the link disconnection, it transfers the link disconnection information to the control unit.

Then, the control unit finds all the vacant incoming lines based on the line data in the control unit, transfers the rear blocking signal to the change signal transmission / reception unit for all the found lines, and receives the change signal. The transmission / reception unit instructs the supervisory signal transmission unit to perform the posterior occlusion, and the supervisory signal transmission unit transfers the posterior occlusion signal, which is a supervisory signal, to the originating exchange through the supervisory signal insertion / removal unit, and the exchange. Then, the line is closed.

When the link management unit detects the link connection, the link management unit transfers the link connection information to the control unit, and the control unit searches for all available incoming lines based on the line data in the control unit, and finds each Transfers the blockage release signal to the change signal transmission / reception unit for the line, the change signal transmission / reception unit instructs the monitor signal transmission unit to release the blockage, and the monitor signal transmission unit inserts / removes the monitor signal blockage release signal into the monitor signal. Data is transferred to the originating exchange through the section, and the exchange is set to the idle state.

〔Example〕

FIG. 1 is a flow chart showing a connection procedure at the time of making a call in implementing the present invention.

As is clear from comparison between FIG. 1 and FIG. 6, when the individual line signal conversion device 3 receives the activation signal from the existing exchange 1 in the individual line signal format, the individual line signal conversion device 3 sends the activation completion signal at that time. To the satellite line control station 8
It will be seen that it is sending the activation signal (satellite CS) converted to the common line signal format.

The circuit operation when the present invention is implemented will be described below with reference to FIGS. 4 and 5 in addition to FIG.

A start signal (one of monitoring signals) is transferred from the calling side and the exchange 1 to the individual line signal converter 3 via the telephone line 9. The transferred activation signal is taken out by the supervisory signal inserting / removing unit 17 and transferred to the supervisory signal receiving unit 18 in the individual line signal converter 3. The supervisory signal receiver 18 detects a start signal (level change) as a supervisory signal and transfers it to the change signal transmitter / receiver 20.

When the change signal transmission / reception unit 20 receives the activation signal from the supervisory signal reception unit 18, the change signal transmission / reception unit 20 transfers the activation completion signal to the supervisory signal transmission unit 19 and also transmits the supervisory signal (the activation signal to the satellite line control station 8 to the link management unit 21. ) Is requested to be transferred.

Upon receiving the activation completion signal, the supervisory signal transmission unit 19 transfers the activation completion signal from the supervisory signal insertion / removal unit 17 to the exchange 1 via the telephone line 9.

The satellite line control station 8 that has received the supervisory signal (starting signal) from the individual line signal conversion device 3 via the satellite control line is a path of the satellite communication line 15 between the satellite line control station 8 and the earth station 5. When an instruction is sent to the earth station 5 to connect the satellite and the path connection is completed, the communication line (without a supervisory signal) is thereby transmitted from the exchange 1 through the individual line signal conversion device 3 and the earth station 5 to the satellite line. The path to the control station 8 is completed.

When the path is completed, it is a register signal from the exchange 1.
The KP signal is sent out and received by the satellite line control station 8, and based on this received signal, the satellite line control station 8 turns on as a supervisory signal to the individual line signal conversion device 3 via the satellite control line 16. Instruct to send a signal. Upon receiving the transmission instruction signal, the link management unit 21 of the individual line signal conversion device 3 transfers the transmission instruction signal to the change signal transmission / reception unit 20.

The change signal transmission / reception unit 20 issues an ON signal transmission instruction to the monitoring signal transmission unit 19 which translates the received ON transmission instruction signal. The supervisory signal sending unit 19 transfers an ON signal to the exchange 1 via the supervisory signal inserting / removing unit 17 and the telephone line 9.

Upon receiving the ON signal, the exchange 1 transfers the selected numeral signal, which is a register signal, to the satellite line control station 8 via the communication lines 9, 11, and 15. In this way, the individual line signal conversion device 3 is
Only when the activation signal is received, the activation completion signal is autonomously returned to the originating exchange, and all other signals are relayed and transferred to the satellite line control station 8.

FIG. 2 is a flow chart showing a procedure for issuing an incoming line call when a link failure occurs when the individual line signal converter according to the present invention is used.

The circuit operation will be described below with reference to FIGS. 4 and 5 in addition to FIG.

As in the case of FIG. 1, at the time of making a call, a start 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 transferred to the supervisory signal receiving unit 18 extracted by the supervisory signal inserting / removing unit 17 in the individual line signal conversion device 3. In the supervisory signal receiver 18, a start signal (level change) as a supervisory signal
Is detected and transferred to the change signal transmission / reception unit 20.

When the change signal transmission / reception unit 20 receives the activation signal from the supervisory signal reception unit 18, the change signal transmission / reception unit 20 transfers the activation completion signal to the supervisory signal transmission unit 19 and also transmits the supervisory signal (the activation signal to the satellite line control station 8 to the link management unit 21. ) Is requested to be transferred.

Upon receiving the activation completion signal, the supervisory signal transmission unit 19 transfers the activation 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 activation completion signal,
Hunt the MF sender, which is a common device for sending selected digits.

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

Upon receiving the notification, the control unit 22 transfers the ON signal to the change signal transmission / reception unit 20 at a timing, and the change signal transmission / reception unit 20 instructs the monitoring signal transmission unit 19 to transmit the ON signal, and the monitoring signal transmission unit 20.
Reference numeral 19 transfers an ON signal, which is a monitoring signal, to the exchange 1 via the monitoring signal inserting / removing unit 17.

When the exchange 1 receives the ON signal, it sends a selected number signal which is a register signal, and releases the MF sender at the completion thereof. However, this selected numeral signal is not received because it is not connected to the satellite line control station 8. After that, the control unit 22 of the individual line signal conversion device 3 provides monitoring until the disconnection signal, which is the monitoring signal, is transferred from the exchange 1, and when the disconnection signal is transferred, the control unit 22 determines that it is in an empty state and ends the operation.

FIG. 3 is a flow chart showing a blocking procedure for an empty line when the individual line signal converter according to the present invention is used.

The circuit operation will be described below with reference to FIGS. 4 and 5 in addition to FIG.

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

The change signal transmission / reception unit 20 instructs the supervisory signal transmitter 19 to perform the posterior occlusion, and the supervisory signal transmitter 19 transfers the posterior occlusion signal, which is the supervisory signal, to the exchange 1 via the supervisory signal inserting / removing unit 17. In the exchange 1, upon receiving the subsequent block signal, the line is blocked, and thereafter, the call connection request for the route to the individual line signal converter 3 is stopped.

When the link connection is detected, the operation opposite to the above is performed, the link management unit 21 of the individual line signal conversion device 3 detects the link connection, and transfers the link connection information to the control unit 22.
The control unit 22 searches for all the vacant incoming lines based on the line data in the control unit, and transfers the block release signal to the change signal transmission / reception unit 20 for all the found lines.

The change signal transmission / reception unit 20 instructs the monitoring signal transmission unit 19 to release the blockage, and the monitoring signal transmission unit 19 transfers the blockage release signal, which is the monitoring signal, to the exchange 1 via the monitoring signal insertion / removal unit 17. Upon receiving the blockage release signal, the exchange 1 puts the line in the idle state, and thereafter restarts the call connection request to the individual line signal converter 3 for the route.

〔The invention's effect〕

As described above, according to the present invention, in the individual line signal conversion device, since the activation completion signal is autonomously returned to the exchange when the activation signal is received from the exchange, the activation delay can be reduced, and the timeout of the preceding exchange can be prevented. It has the advantage of not being afraid.

Also, when a link failure occurs, it detects it and autonomously sends out an individual line signal, performs a process of sending out to the opposite switch for the line in communication, and blocks the idle incoming line. Therefore, there is an advantage that the failure of the satellite line system is not propagated to the exchange side.

[Brief description of drawings]

FIG. 1 is a flow chart showing a connection procedure at the time of making a call when the present invention is carried out, and FIG. 2 is a flow chart showing an outgoing call procedure of an incoming line call at the time of a link failure when using the individual line signal converter according to the present invention. 3 is a flow chart showing a blocking procedure for an idle line when the individual line signal converter according to the present invention is used, FIG. 4 is a system configuration diagram of a switching system using the individual line signal converter, and FIG. 5 is FIG. FIG. 6 is a block diagram showing details of the individual line signal converter in FIG. 6, and FIG. 6 is a flow chart showing a 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
…… Call line (with monitor signal), 11,12 …… Call line (without monitor signal), 13,14 …… Common control line, 15 …… Satellite call line, 16 …… Satellite control line (satellite CS), 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 unit,
22 ... Control unit

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-60-250756 (JP, A) JP-A-60-14531 (JP, A) JP-A-59-185441 (JP, A)

Claims (1)

(57) [Claims] 1. An individual line signal is received from an existing exchange network adopting an individual line signal system, and after being converted into a common line signal,
In an individual line signal conversion device that outputs to a satellite line system adopting a common line signal system, a supervisory signal insertion / extraction unit that inserts / extracts only a supervisory signal, which is one of the individual line signals, from the existing communication line on the exchange network side ( 17)
And a supervisory signal receiver (18) and a supervisory signal transmitter (19)
And a change signal transmission / reception unit (20) and a link management unit (21) that monitors the state of the link that transfers the monitoring signal to the satellite line system.
And a control unit (22), when a call signal is transmitted from the existing exchange through the telephone line (9) at the time of making a call, the supervisory signal insertion / removal unit ( 17) takes this out and sends it to the supervisory signal receiver (1
8), and the supervisory signal receiver (18) detects the start signal and transfers it to the change signal transmitter / receiver (20), and the change signal transmitter / receiver (20) receives the transferred start signal. Then, the start completion signal is transferred to the supervisory signal sending unit (19) and the link management unit (21) is requested to transfer the start signal to the satellite line system as a common line signal, while the start completion signal is received. The monitoring signal sending unit (1
9) transfers the activation completion signal from the supervisory signal insertion / removal unit (17) to the exchange on the originating side via the communication line (9), and, on the other hand, is requested to transfer the activation signal to the satellite line system. The link management unit (21) transfers the link disconnection information to the control unit (22) when detecting the link disconnection, and then the control unit (22).
Finds all the vacant incoming lines based on the line data in the control unit, transfers the posterior blocking signal to the change signal transmission / reception unit (20) for all the found lines, and receives the change signal The transmission / reception unit (20) instructs the supervisory signal transmission unit (19) to perform the posterior occlusion, and the supervisory signal transmission unit (19) transmits the posterior occlusion signal, which is a supervisory signal, via the supervisory signal insertion / removal unit (17). When the link management unit (21) detects a link connection, the link management unit (21) detects the link connection information and transfers the link connection information to the control unit ( 22) transfer to
The control unit (22) searches for all vacant incoming lines based on the line data in the control unit, and transfers a blockage release signal to the change signal transmission / reception unit (20) for all the found lines.
The change signal transmission / reception unit (20) instructs the monitoring signal transmission unit (19) to release the blockage, and the monitoring signal transmission unit (19) transmits the blockage release signal which is the monitoring signal via the monitoring signal insertion / removal unit (17). An individual line signal conversion device, characterized in that the individual line signal converter transfers the signal to the originating exchange and makes the exchange idle.