JPH0818687A - Alternative system for leased high-speed digital line - Google Patents

Abstract

PURPOSE:The provide an alternative function to a leased high-speed digital line having plural connection destinations because of using the multiple access service. CONSTITUTION:In a time division multiplexer 101, a fault detection part of a private line terminal panel 108 detects the fault of a point C. It is notified to a control part 114 as well as a fault generation time slot position. The control part 114 is a link between the time division multiplexers 101-102 from the time slot of the fault generation and the self station judges it as an originating call side. The ISDN terminal panel to be used and he channel and connection information are obtained from backup information of the link where a fault is generated. The control part 114 sets the transmission of the only link data including the fault generation time slot in the data hand link part of an ISDN terminal panel 111 to an ISDN line 117. A control part 115 of the time division multiplexer 103 judges the self station as an incoming call side and waits for the connection of an ISDN line 118.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a time division multiplexer I
The present invention relates to a detour system for a high-speed digital leased line to an SDN line, and particularly to a detour system for a high-speed digital leased line having a plurality of connection destinations.

[0002]

2. Description of the Related Art In a conventional high-speed digital leased line detour system, even if the high-speed digital leased line is divided into a plurality of links and used, the backup information used during the detour operation is stored in one high-speed digital leased line. Even if only one type is prepared and the inside of the ISDN line used for backup is logically divided into multiple channels and used,
All channels on the N line were connected to the same party, and all signals on the high-speed digital leased line were diverted to the same destination.

FIG. 3 shows an IS of a conventional time division multiplexer.
This is a detour system for a high-speed digital leased line to a DN line.
In the case of connecting the ISDN lines 310 and 311 and the ISDN network 312 in FIG. 3, a call is made from the time division multiplexer 301 and an incoming call is made from the time division multiplexer 302, so that the ISDN lines 310 and 311 and the ISDN network are connected. 312 is connected. That is, the time division multiplexing apparatus 301 is determined in advance as the calling side, and the time division multiplexing apparatus 302 is decided as the called side.

In FIG. 3, a high speed digital leased line 30 is used.
The operation when a failure occurs in No. 3 will be described. First, in the time division multiplexing apparatus 301, the leased line termination board 306 detects it and notifies the control unit 308. The control unit 308 sends the connection information of the ISDN lines 310 and 311 to the ISDN terminating board 304 and requests the line connection because the own station is the calling side. The ISDN terminal board 304 includes an ISDN line 310,
A call is made to 311 to perform an ID check, and if normal, it notifies the control unit 308 that the line connection is completed. Next, the control unit 308 uses the dedicated line termination board 30 until now.
6 so that the data sent to the ISDN terminal board 304 will be sent to the ISDN terminal board 304.
This is performed for the N terminal board 304.

On the other hand, in the time division multiplexer 302, the leased line termination board 307 notifies the controller 309 of the occurrence of a failure. The control unit 309 determines that the own station is the called side, and the ISDN
Wait for the lines 310 and 311 to be connected. When the ISDN terminal board 305 detects an incoming call, ID check is performed,
If normal, the control unit 309 is provided with the ISDN lines 310, 31.
Notify that 1 has been connected.

Next, the control unit 309 determines that the data sent to the dedicated line termination board 307 until now is the ISDN termination board 30.
5 to change the settings so that the dedicated line termination board 30
7 and ISDN terminal board 305. The bypass operation is completed by the series of operations described above.

As the operation when the fault of the high-speed digital leased line 303 is recovered during the above detour operation, first, in the time division multiplexer 301, the leased line termination board 3 is used.
06 detects the failure recovery and notifies the control unit 308. The control unit 308 changes the settings of the leased line termination board 307 and the ISDN termination board 305 so that the data transmitted to the ISDN termination board 304 is transmitted to the leased line termination board 306. After that, a request for disconnecting the line is issued to the ISDN termination board 304. The ISDN termination board 304 notifies the control unit 308 that the disconnection of the line has been completed.

On the other hand, as the operation of the time division multiplexer 302, the leased line termination board 307 detects the failure recovery, and the control unit 3
09 will be notified. The control unit 309 uses the ISDN line 31.
Wait for 0,311 to be disconnected. ISDN terminal board 30
When 5 detects the disconnection of the line, it notifies the control unit 309. After that, the control unit 309 changes the settings of the private line terminal board 307 and the ISDN terminal board 305 so that the data sent to the ISDN terminal board 305 is sent to the private line terminal board 307. Through the series of operations described above, the bypass operation is stopped and the normal operation state is restored.

[0009]

In the above-mentioned conventional high-speed digital leased line detour system, the backup information used during the detour operation is provided for each high-speed digital leased line.
Even if only types are prepared and the inside of the ISDN line is logically divided into multiple channels and used, all channels on the ISDN line are connected to the same partner and all signals on the high-speed digital leased line are connected. , I was diverting to the same destination. Therefore, in the case of a high-speed digital leased line using the multiple access service, there is a drawback in that the connection destination may be plural and the detour function cannot be provided.

In view of the above, the present invention improves the shortcomings of the conventional detouring method for a high-speed digital leased line and utilizes a multiple access service, so that a detouring function is provided for a high-speed digital leased line having a plurality of connection destinations. Is intended to have.

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a high-speed digital leased line in a detour system to an ISDN line when a failure occurs in the high-speed constant digital leased line of a time division multiplexer. A link is defined for each of a plurality of connection destinations, the ISDN terminal board to be used, its channel, connection information, incoming and outgoing call information, etc. are set as backup information for each link, and each link of the high-speed digital leased line Each time, by using the set backup information, the detour system of the high-speed digital leased line that performs the detour operation independently is configured.

The ISDN board of the present invention is an ISD
It has an N interface part and a data handling part,
The ISDN interface section connects / disconnects the line and ID
It has an ISDN network control function such as checking of data and a data transfer function between the data handling section and the ISDN line. The data handling section is equipped with a data bus and an ISDN.
It has a function of exchanging data with the interface section.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows a detour system of a high-speed digital leased line to an ISDN line of a time division multiplexer according to an embodiment of the present invention.

FIG. 2 is a block diagram of the inside of the time division multiplexer in one embodiment of the present invention.

In FIG. 1, a high-speed digital leased line 10
Since No. 4 uses the multiple access service, the inside is divided into two logical channels, and the time division multiplexers 102 and 103 are provided via the NTT terminal station 107 and the high-speed digital leased lines 105 and 106, respectively. Connected to. The time division multiplexers 101, 102, and 103 are ISDs via ISDN lines 117, 118, and 119, respectively.
It is connected to the N network 120.

In FIG. 2, the ISDN terminal board 201 is
It has an ISDN interface unit 201a and a data handling unit 201b.

The ISDN interface section 201a sends out the data passed from the ISDN network control functions such as connection / disconnection of lines and ID check and the data handling section 201b to the ISDN line 201c, and vice versa.
It has a function of passing the data received from the N line 201c to the data handling section 201b.

The data handling unit 201b selects necessary data from the data flowing on the data bus 204 of the device based on the instruction from the control unit 203, and transfers it to the ISDN interface unit 201a and vice versa. It has a function of flowing the generated data onto the data bus 204 of the device.

The leased line termination board 202 has a leased line interface section 202d, a data handling section 202e, and a failure detection section 202f.

The dedicated line interface unit 202d sends the data delivered from the data handling unit 202e to the high-speed digital dedicated line 202g, and conversely passes the data received from the high-speed digital dedicated line 202g to the data handling unit 202e. have.

The data handling unit 202e selects necessary data from the data flowing through the data bus 204 of the device based on an instruction from the control unit 203, transfers it to the dedicated line interface unit 202d, and vice versa. It has a function of flowing the passed data onto the data bus 204 of the time division multiplexer.

The fault detection unit 202f monitors the state of the high-speed digital leased line 202g, and when a fault occurs in the high-speed digital leased line 202g, it notifies the control unit 203 together with the time slot position on the faulty leased line. When a fault that has occurred in the high-speed digital leased line 202g is recovered, it has a function of notifying the control unit 203 together with the time slot position on the leased line from which the fault has been recovered.

The control unit 203, the ISDN terminal board 201, and the leased line terminal board 202 are connected by a control bus 205 so that they can communicate with each other.

From the control unit 203 to the data handling unit 201b of the ISDN termination board 201 and the dedicated line termination board 202.
To the data handling unit 202e, the ISDN interface unit 201a of the ISDN termination board 201, and the fault detection unit 202f of the leased line termination board 202 to the control unit 20.
Notification to 3 is performed through this control bus 205.

The operation when a failure occurs at point C on the leased line in this state will be described. First, the time division multiplexing apparatus 10
In the case of No. 1, the fault detection unit of the leased line termination board 108 detects it, and the control unit 114 together with the fault occurrence time slot position.
To notify. The control unit 114 is a link from the time slot in which the failure has occurred to the time division multiplexers 101 to 102, and determines that its own station is the calling side. The ISDN terminal board to be used, its channel and connection information are obtained from the backup information of the failed link. Based on this information
The used channel and connection information are passed to the ISDN interface section of the ISDN terminal board 111 to request line connection. The ISDN interface unit makes a call to the ISDN line to check the ID, and if normal, notifies the control unit 114 that the line connection has been completed. Next, the control unit 114 sets the data handling unit of the ISDN terminal board 111 so that only the data of the link including the failure occurrence time slot is transmitted to the ISDN line 117. After that, the data handling unit of the private line termination board 108 is set so that only the data of the backed up link does not flow on the private line.

On the other hand, in the time division multiplexing apparatus 102, the fault detection unit of the leased line termination board 109 notifies the control unit 115 together with the fault occurrence time slot position. The control unit 115
Time-division multiplexing apparatus 101-from failure occurrence time slot
It is a link between 102, and it is determined that the own station is the called side. The control unit 115 uses the ISDN line 118 for the called side.
Wait for the connection. ISD of ISDN terminal board 112
When the N interface unit detects an incoming call, the ID check is performed. If normal, the control unit 115 sends the ISDN line 11
Notify that 8 has been connected. Next, the control unit 115
In the ISDN terminal board 112, only the data of the link including the failure occurrence time slot is IS in the data handling section of the ISDN terminal board 112.
The setting is made so that the data is sent to the DN line 118. After that, the data handling unit of the leased line terminal board 109 is set so that only the data of the backed up link is not transmitted to the leased line. The bypass operation is completed by the series of operations described above.

When performing the above backup, C
As the operation when the point failure is recovered, first, in the time division multiplexing apparatus 101, the failure detection unit of the leased line termination board 108 detects the failure recovery and notifies the control unit 114 together with the time slot position where the failure is recovered. . When the control unit 114 searches the setting data for the link to which the notified time slot belongs and confirms that no failure has occurred in all the time slots included in the link, the data handling of the leased line termination board 108 is performed. Make settings so that the data of the link backed up to the department is sent to the dedicated line. Next, the data handling section of the ISDN terminal board 111 is set so that no data is output on the ISDN line. After that, ISDN of ISDN terminal board 111
Issues a line disconnection request to the N interface unit. I
The SDN interface unit notifies the control unit 114 that the disconnection of the line has been completed.

On the other hand, as the operation of the time division multiplexing apparatus 102, the failure detecting section of the leased line termination board 109 detects the failure recovery, and the controller 1 along with the time slot position where the failure is recovered.
Notify 15. The control unit 115 uses the time division multiplexing apparatus 1
Similar to 01, after confirming that no failure has occurred in the corresponding link, it waits for the ISDN line to be disconnected. ISDN
When the ISDN interface unit of the terminal board 112 detects the disconnection of the line, it notifies the control unit 115. After that, the control unit 115 receives the line disconnection notification and sets the data handling units of the leased line termination board 109 and the ISDN termination board 112. Through the series of operations described above, the bypass operation is stopped and the normal operation state is restored.

Similar to the time-division multiplexer 102 described above, the time-division multiplexer 103 having the leased line termination board 110, the ISDN termination board 113 and the control section 116 is an ISD.
The detour function of the high-speed digital leased line 106 to the N line 119 is performed.

[0031]

As described above, in the detour system of the present invention, when the connection destination of the high-speed digital leased line is divided into a plurality of destinations, a link is defined for each connection destination, and each link is defined. As backup information, the ISDN terminal board to be used, its channel, connection information, incoming / outgoing call information, etc. are set in advance, and by using the set backup information for each link of the high-speed digital leased line, the bypass operation is performed independently. Since the multiple access service is used by providing the function for performing the above, it is possible to provide the high-speed digital leased line having a plurality of connection destinations with the detour function.

[Brief description of drawings]

FIG. 1 is an ISD of a time division multiplexer according to an embodiment of the present invention.
It is a block diagram of the detour system of the high-speed digital leased line to the N line.

FIG. 2 is a block diagram of the inside of the time division multiplexing apparatus in one embodiment of the present invention.

FIG. 3 is a block diagram of a detour system of a high-speed digital leased line to an ISDN line of a conventional time division multiplexer.

[Explanation of symbols]

 101, 102, 103 Time-division multiplexer 104, 105, 106 High-speed digital leased line 107 NTT terminal station 108, 109, 110 Leased line termination board 111, 112, 113 ISDN termination board 114, 115, 116 Control section 117, 118 , 119 ISDN line 120 ISDN network 201 ISDN terminal board 201a ISDN interface section 201b Data handling section 201c ISDN line 202 Private line termination board 202d Private line interface section 202e Data handling section 202f Fault detection section 202g High speed digital private line 203 Control section 204 data Bus 205 Control bus 301,302 Time division multiplexer 303 High-speed digital dedicated line 304,305 ISDN termination board 306,307 Dedicated line termination board 308,309 Control Mobe 310, 311 ISDN line 312 ISDN network

Claims (2)

[Claims] 1. In a detour system to an ISDN line when a failure occurs in a high-speed digital leased line of a time division multiplexer, a link is defined for each of a plurality of connection destinations of the high-speed digital leased line, and backup information is provided for each link. The ISDN terminating board to be used, its channel, connection information, and incoming / outgoing call information are set, and the detour operation is independently performed by using the set backup information for each link of the high-speed digital leased line. High-speed digital leased line detour method. 2. The detour system for a high-speed digital leased line according to claim 1, wherein the ISDN terminal board has an ISDN interface section and a data handling section.