JP2507609B2 - ISDN subscriber interface equipment - Google Patents

Description

The present invention relates to an ISDN subscriber interface device in an ISDN switching system.

[Conventional technology]

In conventional ISDN subscriber interface equipment, layer 1
The terminating device and the layer 2 terminating device are integrated so as to accommodate a plurality of lines, and the route switching device is provided on the side facing the main body of the exchange to collect a plurality of subscriber lines.

[Problems to be Solved by the Invention]

In the conventional ISDN subscriber interface device described above,
Since the layer 1 termination device and the layer 2 termination device are integrated and accommodate a plurality of lines, even if one line fails, other normal lines are also subject to maintenance exchange. Even if there is a failure in one line, especially in the layer 2 terminal part, there is a problem that the maintenance unit also becomes the entire device.

[Means for solving the problem]

The ISDN subscriber interface device of the present invention comprises a layer 1 termination device that terminates layer 1 of a plurality of ISDN subscriber terminals via a subscriber line, and a first layer termination device that terminates a layer 2 of the plurality of ISDN subscriber terminals. A layer terminating device, a second layer 2 terminating device used as a backup of the first layer 2 terminating device, and a path between the layer 1 terminating device and the first and second layer 2 terminating devices A first layer 2 for accommodating a plurality of lines, and a path switching device for switching the line, a layer 1 terminating device, a processing device for controlling the first and second layer 2 terminating devices, and the route switching device. The processing device detects a failure of the terminating device, and sends the unreceivable information to the line in which the layer 2 path that is not the failure is set up.
The internal information of the terminal device is read, the read internal information is written to the second layer 2 terminal device, and the layer 1 terminal device and the first layer 2 terminal device that has failed by the path switching device After disconnecting the route between them, a route is set between the layer 1 terminating device and the second layer 2 terminating device, and a reception failure notification is given from the first layer 2 terminating device that has become a failure. Receiving notification is sent to the line via the second layer 2 terminating device, and even if the layer 2 terminating part of a line among a plurality of lines accommodated in the first layer 2 terminating device becomes an obstacle. The configuration is such that the second layer 2 terminating device is switched to without disconnecting the layer 2 route of another line.

〔Example〕

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

Referring to FIG. 1 showing an embodiment of the present invention, an ISDN subscriber interface device 1 is connected to a plurality of ISDN subscriber terminals 12 by a subscriber line 13, terminates layer 1 and layer 2, and is layer 3 or more. It has a function of transmitting and receiving the information of (1) to and from the host device. The subscriber line 13 is connected to the layer 1 terminating device 3, and the layer 1 terminating device 3 connects 2
One B channel and one D channel are separated and connected to the path switching device 6. In the route switching device 6, the information of the B channel enters the interface device 7 at the layer 3 through the route 10 and is output to the host device which processes the layers 3 and above. A plurality of pieces of D channel information enter the layer 2 termination device 4a through the route 8 of the route switching device 6 in a time division manner. The layer 2 terminating device 4a is connected to the processing device 2 by the control bus 11. Further, the processing device 2 is connected to the path switching device 6, another layer 2 termination device 4b, a spare layer 2 termination device 5, and a layer 3 interface device 7 by a control bus 11. The route 9 is a route set when the layer 2 termination device is preliminarily switched.

In this configuration, the ISDN subscriber terminal 12 is connected to the layer 1 termination device 3 by the subscriber line 13. The layer 1 terminating device 3 terminates layer 1 on the subscriber line 13 and separates two B channels and one D channel. Layer 2
The D channel having information passes through the route 8 of the route switching device 6 and is connected to the layer 2 termination device 4a to terminate the layer 2. The layer 3 message is received by the processing device 2 via the control bus 11, and the layer 3 message is also received via the control bus 11.
It is transmitted / received to / from the host device through the interface device 7. Layer 1 terminator 3 accommodates multiple lines,
One layer 2 termination device 4a also accommodates a plurality of lines. Here, the layer 2 of one line with the layer 2 termination device 4a
It is assumed that the terminal end has failed for some reason. The processing device 2 detects a failure occurrence via the control bus 11, notifies the maintenance person, and performs switching processing to the backup layer 2 termination device 5. That is, the unreceivable information is sent to the ISDN subscriber terminal 12 through the layer 2 termination unit corresponding to each round in the layer 2 termination device 4a accommodating a plurality of lines. Subsequently, the information of the layer 2 termination unit corresponding to each line is transferred to the backup layer 2 termination device 5 through the control bus 11. Further, the route 8 in the route switching device 6 is switched to the route 9. After that, through the layer 2 terminating device 5 and the newly set route 9, the ISDN
The subscriber terminal 12 is notified of the receivable information and normal transmission and reception thereafter is enabled. The maintainer is the faulty layer 2 termination device
4a can be replaced for maintenance. After the maintenance replacement, the backup layer 2 terminating device 5 can be transferred to the new layer 2 terminating device 4a that has been replaced without disconnecting the layer 2 link by the operation procedure reverse to that described above.

〔The invention's effect〕

As described above, according to the present invention, by separating the layer 1 termination device and the layer 2 termination device, it is possible to minimize the influence when a failure occurs. Further, even if the interface type of layer 1 is variously changed, it is possible to deal with the change by changing only the layer 1 termination device without affecting the layer 2 termination device.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. 1 ... ISDN subscriber interface device, 2 ... processing device, 3 ... layer 1 termination device, 4a, 4b ... layer 2 termination device, 5 ... spare layer 2 termination device, 6 ... path switching device, 7 ... Layer 3 interface device, 11 ... Control bus, 12 ... ISDN subscriber terminal, 13 ... Subscriber line.

Claims (1)

(57) [Claims] 1. A layer 1 terminating device for terminating layer 1 of a plurality of ISDN subscriber terminals via a subscriber line, and the plurality of ISs.
A first layer 2 termination device terminating layer 2 of a DN subscriber terminal, a second layer 2 termination device used as a backup for the first layer 2 termination device, the layer 1 termination device and the first layer 2 termination device. A route switching device for switching a route between the first and second layer 2 terminating devices, and a processing device for controlling the layer 1 terminating device, the first and second layer 2 terminating devices, and the route switching device. Of the first layer 2 terminating device accommodating a plurality of lines, the processing device detects a fault, and sends the unreceivable information to the line in which the layer 2 route not in trouble is set. Then, the internal information of the faulty first layer 2 termination device is read, the read internal information is written to the second layer 2 termination device, and the route switching device causes a failure with the layer 1 termination device. When To set the path between the layer 1 termination device and the second layer 2 termination device after the route was cut between said Tsu first layer 2 termination device,
A reception enable notification is given to the line to which a reception failure notification has been sent from the first layer 2 termination device that has become a failure via the second layer 2 termination device, and the line is accommodated in the first layer 2 termination device. Layer 2 of one of the multiple lines
An ISDN subscriber interface device characterized by switching to the second layer 2 terminating device without disconnecting the layer 2 route of another line even if the terminating part becomes a failure.