JPH0364148A - Isdn terminal adaptor - Google Patents

Abstract

PURPOSE:To prevent any hindrance in the telephone service even when a commercial power supply is failed by coupling directly an analog telephone set and an ISDN basic access interface bus connecting to an analog subscriber interface of an exchange when the interrupt of the commercial power supply is detected. CONSTITUTION:When a commercial power supply is failed, a commercial power supply interrupt detection circuit/commercial power supply restoration detection circuit 9 interrupts a relay drive circuit 7, a relay contact 6 is switched and a telephone set 4 and an ISDN basic access interface bus 2 are connected directly. On the other hand, the connection of the ISDN basic access interface bus 2 is changed to analog subscriber interface of the exchange at power failure with other means. Thus, unavailability of all communication services together with the telephone service is avoided at commercial power supply failure and the general telephone service is available.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a 1sDNi end adapter.

[Prior Art] Conventionally, since the I5DN terminal adapter consumes a large amount of current, it is designed to use commercial power without being supplied with central power from an exchange. Therefore, in the event of a commercial power outage, unless the subscriber has an emergency power supply, the ISD
N telephone service was about to be suspended.

[Problems to be Solved by the Invention] The conventional ISDN terminal adapter described above is powered from a commercial power supply, so it has the disadvantage that all communications, including telephone communication, are disabled when the commercial power supply is cut off (power outage). be.

SUMMARY OF THE INVENTION An object of the present invention is to provide an I5DN terminal adapter that does not interfere with telephone service even if the commercial power supply is interrupted.

[Means for Solving the Problems] The ISDN 5M terminal adapter of the present invention connects an analog telephone directly to the ISDN basic access interface bus when a commercial power outage is detected, and when recovery from the commercial power outage is detected, Analog telephone 15DN
It has means for restoring the connection via the terminal adapter circuit.

[Function] When the commercial power supply fails, by directly connecting the analog telephone to the ISDN basic access interface bus, the analog telephone is simultaneously connected to the subscriber circuit of the telephone exchange converted to an analog subscriber interface via the ISDN basic access interface bus. and can receive telephone service powered by central office power.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the l5DNia terminal adapter of the present invention.

The l5DN terminal adapter 1 accommodates a telephone 4 via a telephone connection jack 5, and an I5DN terminal adapter 1 accommodates a telephone 4 via a telephone connection jack 5.
It is connected to the SDN basic access interface bus 2. Relay contact 6 is connected to the commercial power supply disconnection detection circuit/
The commercial power restoration detection circuit 9 operates and connects the relay drive circuit 7 while the commercial power is energized, so that the telephone 4 is connected to the relay drive circuit 7, which includes the A/D and D/A conversion circuits.
It is connected to the ISDN basic access interface bus 2 via a DN terminal adapter circuit 8. When the commercial power supply stops (power outage), the commercial power supply interruption detection circuit/commercial power supply recovery detection circuit 9 disconnects the relay drive circuit 7, switches the relay contact 6, and connects the telephone 4 and the ISDN basic access interface bus 2. Directly connected. On the other hand, ISDN basic access interface bus 2
Since the connection is changed to the analog subscriber interface of the exchange in the event of a power outage using means proposed separately, it is possible to enjoy telephone service powered by the central office power supply. When the commercial power is restored, the commercial power failure detection circuit/commercial power restoration detection circuit 9 activates the relay drive circuit 7 and connects the telephone 4 to the ISDN basic access interface bus 2 via the ISDN terminal adapter circuit 8.

[Effects of the Invention] As explained above, the present invention, when a commercial power outage is detected, directly connects an analog telephone to an ISDN basic access interface bus connected to an analog subscriber interface of an exchange, thereby replacing the conventional As such, there is an advantage that -M telephone service can be provided without all communication services including telephone service being unavailable during a commercial power outage.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the ISDN terminal adapter of the present invention. DESCRIPTION OF SYMBOLS 1...ISDN terminal adapter, 2-ISDN basic access interface bus, 3...Connector, 4...Telephone, 5...Telephone connection jack, 6...Relay contact, 7... - Relay drive circuit, 8-IS D N terminal adapter circuit, 9... commercial power supply interruption detection circuit/commercial power supply recovery detection circuit.

Claims (1)

[Claims] 1.Accommodates an analog telephone, includes D/A and A/D conversion circuits in the ISDN terminal adapter circuit, and connects to ISDN in the event of a power outage.
For ISDN terminal adapters where the basic access interface bus is connected to the analog subscriber interface of a telephone exchange, when a utility power outage is detected, the analog telephone is connected directly to the ISDN basic access interface bus to recover from the utility power outage. An ISDN terminal adapter, comprising means for, upon detection, restoring the analog telephone to a connection to an ISDN basic access interface bus via an ISDN terminal adapter circuit.