Transmitter-receiver device and a communication system

Details Transmitter-receiver device and a communication system Transmitter-receiver device and a communication system

2007-07-24

2007-07-24

Singh, Dalzid (Department: 2613)

Optical communications

Diagnostic testing

Fault location

C398S016000, C398S017000, C398S030000, C398S031000, C398S033000

Reexamination Certificate

active

10381481

ABSTRACT:
The invention concerns a transmitter-receiver device (A, B) which comprises a receiver unit (RXA) arranged to receive light and optical signals from a transmitter unit (TXA) arranged to transmit light and optical signals. The device also comprises a supervising unit (CUA) which prevents the transmitter unit (TXA) from continuously transmitting light when the supervising unit (CUA) detects that the receiver unit (RXA) does not receive light. The supervising unit (CUA) is arranged to, when it detects that the receiver unit (RXA) does not receive light, change to a test mode where the transmitter unit (TXA) is controlled to intermittently transmit short light pulses the supervising unit has an output (109) where a status signal indicates whether the transmitter-receiver device is in said test mode. The invention also concerns a communication system which comprising at least two such transmitter-receiver devices.

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