Timing recovery in a network-synchronized modem

Details Timing recovery in a network-synchronized modem Timing recovery in a network-synchronized modem

H - Electricity

04

L

H04L 7/10 (2006.01) H04J 3/06 (2006.01) H04L 7/04 (2006.01) H04L 7/08 (2006.01) H04L 25/49 (2006.01) H04M 11/06 (2006.01)

Patent

CA 2170931

A timing technique for a Quantization-Level-Sampling (QLS) modem puts timing information in a downstream pulsed signal transmitted from the public switched telephone network (PSTN) to the QLS modem. In response to this timing information, the QLS modem synchronizes to the network sampling clock of the PSTN. In particular, the pulsed signal includes data-bearing samples, which were provided by a far-end QLS modem, and at least one non-user-data-bearing (NUDB) sample in which the level of this NUDB sample periodically alternates. The QLS modem extracts timing information from this periodic alternating signal level to synchronize the QLS modem to the network sampling clock.

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