APPENDIX A
TROUBLESHOOTING
SYMPTOM
PROBLEM
SOLUTION
5.4 POWER-DOWN
Turn off the Model 1180/35 by simply unplugging the AC power
adapter from the wall. There is no power switch on the Model 1180/35.
LEDs do not light
when AC power
transformer is
plugged into wall
Carrier Detect (CD)
LED is low
or
Carrier Detect (CD)
LED is high, but
1180/35s are not
communicating
1. Loose power
connection
2. Outlet is defective
3. AC power cord is
defective
4. AC transformer is
not plugged into the
Model 1180/35
1. If CD is low,
possible
synchronization loss
2. Test Mode switch is
in the wrong position
3. DIP switches are set
improperly
4. Fiber link is
connected improperly
5. V.35 connections
are faulty or cables are
pinned wrong
1. Make sure the AC
connection is flush
2. Try a different outlet
3. Remove the cord
from the outlet and
check for continuity
4. Have another cup of
coffee!
1. Check for ongoing
power loss or break in
fiber if CD does not go
high within 60
seconds
2. Be sure the Test
Mode switch is set to
NORMAL on both
Model 1180/35s
3. Check all DIP switch
settings, esp. Reset
and Data Rate,
against those in
Section 3; make sure
both 1180/35s are set
the same way
4. Check the ST or
SMA connection on the
back of both 1180/35s
5. Check V.35 cable
continuity and pinning
11
12
Figure 7. Local and Remote Loopback Test Modes
