Network terminating terminal apparatus for integrated services d

Details Network terminating terminal apparatus for integrated services d Network terminating terminal apparatus for integrated services d

Filed on

1990-12-05

Date issued

1993-04-20

Examiner

Olms, Douglas W.

Patent Class

Multiplex communications

SubClass

Wide area network

SubSubClass

Packet switching

Other Related Categories

370 581, H04J 312

Type

Patent

Status

active

Patent number

052048608

Description

ABSTRACT:
Network terminating terminal apparatus, for use in an Integrated Services Digital Network, comprises a U-interface and a S/T interface. The U-interface allows the integrated terminal apparatus to communicate with a central office directly, without a separate network terminator. Remote terminals may be connected to the network terminating terminal apparatus, via its S/T interface. The network terminating terminal apparatus then serves as a conventional network terminator. The network terminating terminal apparatus includes circuitry for controlling D-channel access by the integrated terminal apparatus. The circuitry detects the framing of the signal received at the U-interface and the D-channel information from the remote terminals and ensures that the D-channel data from the integrated terminal apparatus is supplied to the S/T interface at the appropriate time for insertion into the D-echo channel of the signal returned to the remote terminals. In addition, the D-channel data from the integrated terminal apparatus is supplied to the U interface, with the D-channel from remote terminals, for transmission in D-channel of the signal to the central office.

REFERENCES:
patent: 4592045 (1986-05-01), Fundneider
patent: 4592047 (1986-05-01), Fundneider
patent: 4835769 (1989-05-01), Donaghue, Jr. et al.
patent: 4905237 (1990-02-01), Voelzke
patent: 4965795 (1990-10-01), Coffelt et al.
patent: 4965811 (1990-10-01), Sparks
patent: 4985891 (1991-01-01), Fujiwara et al.

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