Open loop desynchronizer

Details Open loop desynchronizer Open loop desynchronizer

1993-07-01

1996-03-05

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

370102, H04L 700

Patent

active

054974054

ABSTRACT:
An open loop desynchronizer (10) includes a demapper (12) that reads asynchronous data from a synchronous channel (14) and writes this data to a first in first out buffer (18). The demapper (12) decodes deviations from a nominal stuff bit rate that indicates whether fewer or more stuff bits than data bits are needed on the synchronous channel (14) and generates a frequency deviation control signal (20) therefrom. The frequency deviation control signal (20) drives a digital filter (22) and a numerically controlled oscillator (24). The digital filter (22) and numerically controlled oscillator (24) generate a transmit clock (26) that tracks the asynchronous payload rate according to unit pulses on the frequency deviation control signal (20). The first in first out buffer (18) transmits the asynchronous data over a transmit data line (28) according to the asynchronous payload rate generated on the transmit clock (26).

REFERENCES:
patent: 4791652 (1988-12-01), McEachern et al.
patent: 5052025 (1991-09-01), Duff et al.
patent: 5131013 (1992-07-01), Choi
patent: 5268935 (1993-12-01), Mediavilla et al.
patent: 5339338 (1994-08-01), Elliott
patent: 5367545 (1994-11-01), Yamashita et al.

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