JPH0290768A - Exchange for housing isdn subscriber - Google Patents

Abstract

PURPOSE:To continue a service by switching to the service of a general telephone sat in the power failure of a commercial power source in a customer system by switching an ISDN terminal and the general telephone set corresponding to the state of the commercial power source in an ISDN subscriber residence. CONSTITUTION:When the power failure occurs in the commercial power source in the customer system, a customer network terminating device (NT) 3 automatically connects a subscriber line 6 to a jack 4, and in an exchange, an ISDN layer synchronism supervisory circuit(SUP) 9 detects the step out of a layer 1 for a constant period, and reports it to a CPU 15 via a CPU bus 14. The CPU 15 drives a relay(Rb) 7 by issuing an instruction to a relay drive instruction input/output port (I/O) 12 via the CPU bus 14. A contact rl is set at a state shown in broken line by the operation of the RL 7, and the subscriber line 6 is switched to a general telephone subscriber termination circuit(SLC) 10 side. At this time, the CPU 15 performs a call processing by judging the outgoing/incoming call of the SLC 10 as the one identical to that of an ISDN layer termination circuit(DLC) 8. In such a way, a telephone service can be offered by using the general telephone set (TPH) 5 in the power failure of the subscriber residence.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an ISDN subscriber accommodating switch.

[Conventional technology]

I SDN terminals inside the premises that are connected to the I SDN basic access subscriber line consume a large amount of current and cannot be supplied with power from the switching center.
Power is being supplied to the SDN terminal.

[Problem to be solved by the invention]

The conventional ISDN terminals mentioned above are powered from the commercial power supply in the house, so if the commercial power supply in the house is cut off (power outage), the ISDN subscriber will be unable to make or receive calls from the terminal, and will not be able to make or receive calls from the terminal, and will not be able to make or receive calls from the terminal, and will be connected to the general telephone network. The transmission of.

The drawback is that you cannot receive calls.

[Means to solve the problem]

The ISDN subscriber accommodating exchange of the present invention includes an exchange that accommodates an ISDN subscriber line termination circuit and a general telephone subscriber line termination circuit of an ISDN basic access interface, and a switch that accommodates an ISDN subscriber line termination circuit and a general telephone subscriber line termination circuit of an ISDN basic access interface; a switching means provided on the subscriber line side to switch and connect the subscriber line to either the ISDN subscriber line termination circuit or the general telephone subscriber line termination circuit; and a detection means for detecting restoration, and the ISDN terminal and the -
It is characterized by switching between FFI and FFI telephones.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of an ISDN subscriber accommodating exchange according to the present invention.

In FIG. 1, in the home system, a home network terminal (hereinafter referred to as NT) 3 is connected to a subscriber line 6 from an exchange, and when the commercial power supply (not shown) is cut off, the NT3 connects the subscriber line 6 to a general telephone (
It is connected to the TPH 5 via a telephone connection jack (hereinafter simply called jack) 4. Further, the NT 3 is connected to an ISDN terminal (hereinafter referred to as TRM) 1 via a home bus 2 . On the other hand, at the exchange, the subscriber line 6 is connected to the ISDN layer 1 termination circuit (hereinafter DLC>8) via the contact point (hereinafter rJi) of the relay (hereinafter RL) 7, and the DLC 8 converts the data on the subscriber line 6 into the basic Access interface (2B
+D) and connected to the exchange (hereinafter referred to as 5WE) 13. In addition, the I SDN layer 1 synchronization monitoring circuit (hereinafter referred to as 5)
UP)9 is connected to DLC8 to perform synchronization/asynchronous detection of ISDN layer 1, RL7 is connected from CPU15 to CPU
Bus14. Relay drive instruction input/output port (hereinafter referred to as l10)
The drive is controlled via 12. Furthermore, SWE 13 has r! 2 and general telephone subscriber line termination circuit (hereinafter referred to as 5LC)
A general subscriber status detection circuit (hereinafter referred to as DET) accommodates a voice channel 16 from TPH 5 on subscriber line 6 via
Connect 11 to 5LCIO to detect calls from TPH5,
Performs ringer sending, response detection 2 selection numeric signal detection, etc. Note that the CPU 15 is connected to the SWE 13, and
5UP9. via U bus 14. DETI 1. l101
．． 2 and performs predetermined call processing.

Next, the operation of this embodiment will be explained.

Normally, the in-home system is supplied with power from the commercial power supply, so rII is in the state shown by the solid line at the exchange, and the data from TRML is transferred to the in-home bus 2. NT3 to subscriber line 6, and DLC8 to subscriber line 6 via rl2 (solid line).
The basic access interface (2B+D) is taken out from the 5WE13 and ISDN service is provided.

Here, if the in-house commercial power supply stops (power outage), the NT3
automatically connects the subscriber line 6 to the jack 4, and at the exchange, 5UP9 detects that the layer 1 synchronization 7 is out of synchronization for a certain period of time, and connects the CPU via the CPU bus 14.
Report on 15th.

The CPU 15 gives an instruction to the l1012 via the CPU bus 14 to drive the RL7. rl due to the operation of RL7
The state becomes the state shown by the broken line, and the subscriber line 6 is switched to the 5LCIO side. At this time, the CPU 15 determines that the call to and from the 5LCIO is equivalent to the call to and from the DLC8, and processes the call.Therefore, in the event of a power outage in the subscriber's premises, telephone service is provided using the TPH5.

When the power outage is restored, if you make a call from TPH5 and dial the predetermined special number, the exchange will call you r, R (dashed line),
DETII detects this special number via 5LCIO and sends C
The CPU 15 is notified via the PU bus 14. TPH5
A special tone (ISDN switching request response tone) is returned to the subscriber line 6 by a generally known method, and the CPU 15 restores the RL 7 and returns the subscriber line 6 to the DLC 8 side. On the other hand, in the home system, turn on the NT3 and connect the subscriber line 6 from the TPH5 side to TR.
Switch to the Ml side and receive ISDN subscriber services from then on.

〔Effect of the invention〕

As described above, the present invention has the advantage of being able to detect a power outage of the commercial power supply in the home system and switch the telephone service to the home system to a regular telephone service to continue providing service.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an ISDN subscriber accommodating exchange according to the present invention. 1. ISDN terminal (TRM), 2.. Home bus, 3.. Home network terminal device (NT), 4.. Telephone connection jack, 5.. General telephone set (TPH), 6.
...Subscriber line, 7-...! J Shire RL>, 8-ISD
N layer 1 Hiiragi end circuit (DLC), 9...I SDN layer 1 synchronization monitoring circuit (SUP), 10... General telephone subscriber line termination circuit (SLC), 11... General subscriber status detection circuit (DET), 12... Relay drive instruction input/output capo-1-(I, 10), 13-... Exchange (SWE)
, 14-... CPLI bus, 15... CPU, 16-
...Audio channel.

Claims (1)

[Claims] ISDN Basic Access Interface ISDN
An exchange that accommodates a subscriber line termination circuit and a general telephone subscriber line termination circuit, and a switch installed on the subscriber line side in the previous stage of both of the subscriber line termination circuits to connect the subscriber line to the ISDN subscriber line termination circuit and the ISDN subscriber line termination circuit. A switching means for switching connection to any of the general telephone subscriber line termination circuits, and a detection means for detecting disconnection and restoration of commercial power in the ISDN subscriber's premises,
An ISDN subscriber accommodating exchange characterized by switching between an ISDN terminal and a general telephone according to the state of a commercial power source in the subscriber's premises.