CITYLIGHT 10/100 ETHERNET TRANSCEIVER CARD
27
PROBLEM
POSSIBLE CAUSES
THE LINK LED DOES NOT
ILLUMINATE.
NOTE IF LINK LOSS FORWARDING IS DISABLED THEN
EACH OF THE COPPER AND FIBER LINKS OPERATE
INDEPENDENTLY.
THE REM F LED IS
ILLUMINATED.
THE CITYLIGHT 10/100 ETHERNET TRANSCEIVER CAN
SEE THE FAR-END DEVICE. THE FAR-END DEVICE
CANNOT SEE THIS 10/100 ETHERNET TRANSCEIVER. A
FAULT LIES IN OR BETWEEN THE TRANSMITTER OF
THIS CARD AND THE REMOTE CARD RECEIVER.
CHECK THAT THE RECEIVE POWER AT THE REMOTE
DEVICE IS GREATER THAN -28 dBm.
THE ALARM LED IS
ILLUMINATED.
THE FIBER LINK IS NOT WORKING. CHECK THE
RECEIVE CONNECTORS AND MAKE SURE POWER IS
CORRECTLY SUPPLIED TO ALL DEVICES. THE RECEIVE
POWER LIGHT LEVEL SHOULD BE GREATER THAN -28
dBm. IF THE RECEIVE POWER IS LESS THAN -28 dBm AT
THE CITYLIGHT 1U OR 3U CHASSIS, CHECK THE
LAUNCH POWER OF THE CITYLIGHT 10/100 ETHERNET
TRANSCEIVER IN THE REMOTE CHASSIS IS GREATER
THAN -10 dBm FOR THE STANDARD-POWER UNIT AND -3
dBm FOR THE HIGH-POWER UNIT. IF THE RECEIVE
POWER IS LESS THAN -28 dBm, CHECK THE LAUNCH
POWER OF THE CITYLIGHT 10/100 ETHERNET
TRANSCEIVER IN THE CITYLIGHT 1U OR 3U CHASSIS AS
ABOVE.
CHECK THAT THE LINK LOSS IS LESS THAN 18 dB FOR
THE STANDARD-POWER UNIT OR 25 dB FOR THE HIGH-
POWER UNIT.
THE DATA ACTIVITY LED DOES
NOT ILLUMINATE.
CHECK THE CONNECTED DEVICES ARE TURNED ON.
CHECK THAT THE ATTACHED NETWORK DEVICES ARE
ACTIVE AND ARE CARRYING DATA. CONTINUED
OVERLEAF…
