CANOGA PERKINS 3240S SNMP-Managed T1/E1 Fiber-Optic Multiplexer - Manual (Page 37)

EdgeAccess
3240S Fiber-Optic Multiplexer 4-5
Start
Set Local mux to Local
loopback
Data
loops?
Set Local mux to
Remote loopback
Data
loops?
No
No
Connect fiber jumper between local Rx
and Tx, then set MODE switch to NOR
Data
loops?
No
Check received optical
power at local Rx
>/= lowest
power value?
Check transmitted optical
power at remote mux Tx
Check transmitted optical
power at local Tx
Tests local I/O ports
and most of Local mux
Tests Local mux, fiber, and all of
Remote mux except I/O ports
Tests Local mux, up to fiber
Replace local mux
Replace remote mux
Replace local mux
>/= lowest
power value?
Replace remote mux
Replace local Rx fiber
Values for lowest received power:
850 nm: -33 db
1310 nm HI pwr/1550 nm: -32 dB
1310 nm LO pwr: -24 dB Values for lowest transmitted power:
850 nm: -21.5 +/-4 db
1310 nm HI pwr: -14 +/-2 dB
1310 nm LO pwr: -24 +/-2 dB
1550 nm: -32 +/-2 dB
>/= lowest
power value?
No
Replace local mux
Check received optical
power at remote Rx
>/= lowest
power value?
Values for lowest received power:
850 nm: -33 db
1310 nm HI pwr/1550 nm: -32 dB
1310 nm LO pwr: -24 dB
Values for lowest transmitted power:
850 nm: -21.5 +/-4 db
1310 nm HI pwr: -14 +/-2 dB
1310 nm LO pwr: -24 +/-2 dB
1550 nm: -32 +/-2 dB
Replace remote mux
Replace remote Rx fiber
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Figure 9. Flowchart for Using Loopback in Troubleshooting