Digital trunk for in-band line signal

Details Digital trunk for in-band line signal Digital trunk for in-band line signal

1996-11-27

1999-02-23

Ton, Dang

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

370248, 370249, 370458, 370384, H04J 312

Patent

active

058751939

ABSTRACT:
A digital trunk for in-band line signals, which is capable of performing the local loopback test to verify not only the normality of the digital trunk but also the normality of the operation of upper hierarchy control devices, on-line software controlling the digital trunk and office data, is realized by only adding a small quantity of hardware of signal droppers and signal inserters. The digital trunk has a line signal sender and a line signal receiver of 32 channels and is provided with signal inserters and signal droppers for looping a speech channel at the time of the loopback test of the trunk. Furthermore, signal inserters and a multiplex circuit are provided for looping an in-band line signal. Time slots 0 and 16 which are usually unused as speech channels on the digital circuit are used as an opposed channel and a reserve channel for a loopback test, respectively, and the loopback test of the local trunk is performed.

REFERENCES:
patent: 4327436 (1982-04-01), Ohara et al.

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