Black Box CityLIGHT LCL533A Manual page 22

CITYLIGHT 10/100 ETHERNET TRANSCEIVER CARD
ALARM RED
REM F RED
22
THIS INDICATES THERE IS A LOSS OF RECEIVE POWER
ON THE FIBER PORT, I.E. THE RECEIVE POWER HAS
DROPPED BELOW -28 dBm.
CHECK THAT THE FIBERS ARE CORRECTLY INSERTED
TX TO RX AND VICE VERSA.
CHECK THAT THE LINK LOSS IS LESS THAN 18 dB FOR
STANDARD-POWER OPTICS AND LESS THAN
25 dB FOR HIGH-POWER OPTICS.
THIS INDICATES THERE IS A FAULT IN THE TRANSMIT
FIBER PATH FROM THIS CITYLIGHT CARD TO THE
REMOTE RECEIVE CITYLIGHT CARD. THE RECEIVE
PATH FIBER IS INTACT. CHECK THE FIBER LINK FROM
THIS CARD'S TRANSMITTER TO THE FAR-END CARD'S
RECEIVER.