Method and apparatus for synchronizing an optical transceiver ov

Details Method and apparatus for synchronizing an optical transceiver ov Method and apparatus for synchronizing an optical transceiver ov

1989-10-27

1992-05-05

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370 941, 370103, H04J 1408

Patent

active

051114518

ABSTRACT:
An optical communication system includes two optical modems (12) and (14) which are disposed at either end of an optical fiber data link (10). The optical modems (12) and (14) communicate through LEDs (16) and (18), respectively, with the fiber data link (10). Each of the optical modems (12) and (14) on start-up are peerless and do not operate in either a master or a slave configuration. A ping-pong transmission format is utilized with transmitted packets of data. When one of the optical modems (12) or (14) detects a transmitted packet from the other, it locks up to the transmitted packet with a phase lock loop and takes on slave status. This slave status is transmitted back to the fiber data link (10) in another transmitted packet. The transmitted packet from the slave device is then adjusted time relative to the machine cycle of the slave device until the packet is received by the other optical modem. Once the other optical modem receives the transmitted packet from the slave optical modem, it recognizes this fact and takes on a master status. This master status is transmitted back to the slave optical modem and adjustment of the relative position of the transmitted packet therein is terminated and the start-up procedure is terminated.

REFERENCES:
patent: 4606023 (1986-08-01), Dragoo
patent: 4720827 (1988-01-01), Kanaji

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