CANOGA PERKINS 2361 T1 Modem - Manual (Page 52)

The EdgeAccess Universal Chassis System
2361 Modem Users Manual 6-2
6.2 Fiber Optic Related Problems
CLS and SQL LEDs are fiber optic cable related indicators. In normal operation, CLS should be
OFF and SQL should be green. SQL Red LED indicates that the optic signal levels are below the
threshold, while CLS Red LED indicates composite signal loss. If both LEDs are RED, this
indicates a failure in the fiber optic cable. In this event, proper steps should be taken to correct the
failed optic cable. If SQL is RED, but CLS is OFF, it indicates that while the modems may be
passing data, that optic cable is marginal. Proper steps should be taken to replace the fiber optic
cable.
The SQL light on every modem should be green, and on the System Alarms screen, the Fiber Loss
of Signal notification should read "No." If this is not the case, test the fiber optic cable and insure
that it meets the specs and also that the loss budget is within the modem specifications.
Most fiber cabling problems will generate a Fiber Local/Remote Loss notification alarm on the
Fiber Loss of Signal entry of the System Alarms screen.
6.3 Connecting Equipment Related Problems
LOS is electrical loss of Signal received from the connecting equipment. Normally this LED
should be OFF and the Electrical Loss of Signal entry of the System Alarms screen should read
"NO." If it reads "YES," check the connecting equipment for any malfunctions. It is also possible
to have an LOS condition where the potentially Tx/Rx signal pairs are crossed over. Verify the
electrical cable for proper pin out.
The other possible problem might be low electrical receiver gain from the connecting equipment.
Please verify the Electrical Receiver Gain line of the Functional Configuration screen. It should
read "-20." If not, consult the connecting equipment for failures and take proper corrective action.
6.4 2361 Modem Related Problems
6.4.1 T1/E1 Switch
The 2361 Modem is a T1 modem. However, it is easily changed to operate as an E1 modem. To
change it, see the section 1.5.1 "T1 Modem at E1 Rate."