Technique for effectively treating robbed bit signaling in data

Details Technique for effectively treating robbed bit signaling in data Technique for effectively treating robbed bit signaling in data

1997-10-31

2000-09-12

Pham, Chi H.

Pulse or digital communications

Equalizers

Automatic

375242, 320523, H03H 730, H04B 1404, H04J 312

Patent

active

061188131

ABSTRACT:
In a communications arrangement, a first pulse code modulation (PCM) modem communicates data in the form of PCM words with a second PCM modem through a public switched telephone network (PSTN). The transmitted data may be affected by robbed bit signaling imposed by the PSTN such that the least significant bits (LSBs) of certain PCM words are "robbed" and substituted with signaling bits. In accordance with the invention, any imposed robbed bit signaling is detected during training of the second PCM modem. The would-be PCM words affected by such robbed bit signaling are identified to the first PCM modem. The latter then avoids transmitting data using the LSBs of those PCM words. In addition, through the training, a decision feed-back equalizer in the second PCM modem is properly adjusted, taking into account any robbed bit signaling affecting the transmitted training data.

REFERENCES:
patent: 5694424 (1997-12-01), Ariyavisitakul
patent: 5729226 (1998-03-01), Betts et al.
patent: 5732112 (1998-03-01), Langbert
patent: 5859872 (1999-01-01), Townshend

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