Passive optical network switchable between an operational mode a

Details Passive optical network switchable between an operational mode a Passive optical network switchable between an operational mode a

1995-02-28

1996-08-20

Boudreau, Leo

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 356 731, H04B 900

Patent

active

055484328

ABSTRACT:
A head-end station for a passive optical network system arranged to transmit and receive TDMA frames having a header portion and a plurality of basic frames, each basic frame includes traffic bits and control bits. The head-end station includes a data transmitter which assembles and transmits downstream frames and also generates a diagnostic signal for transmission in a downstream frame, the station being switchable to a diagnostic mode in which it transmits the diagnostic signal in a downstream frame in the absence of other traffic, and also including a data receiver which receives upstream frames and detects a return of the diagnostic signal. In a preferred example, the head-end station may transmit a diagnostic signal in the header portion of each downstream frame. Also, in a test mode the transmit signal is looped back to the receiver to enable testing of the transmit receive function. Loop back is provided at three levels, namely the transmitter drive level, the monitored output level and at the laser output receiver input level.

REFERENCES:
patent: 4451916 (1984-05-01), Casper et al.
patent: 4749247 (1988-06-01), Large
patent: 4797951 (1989-01-01), Duxbury et al.
patent: 4977593 (1990-12-01), Ballance
patent: 5285305 (1994-02-01), Cohen et al.
IEEE Global Telecommunications Conference & Exhibition, Hollywood, Florida, Nov. 28-Dec. 1, 1988, "Communications for the Information Age", pp. 1579-1583.
Sankawa et al, Fault Location Technique for In-Service Branched Optical Fiber Networks, 1990 IEEE, pp. 766-768.

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