Installation guide

4-5
Cisco IGX 8400 Series Installation Guide, Release 9.3.3 and Later Releases
OL-1165-06
Chapter 4 Troubleshooting the IGX
Troubleshooting an IGX Node
Troubleshooting the IGX Console Alarms
The initial mode of troubleshooting the IGX node uses the console alarms displayed on the console
screen.This section provides you with a procedure for isolating the alarms and thereby isolating the fault.
Any repair to the IGX node must be performed by personnel qualified by Cisco.
Isolating Alarm Faults
Caution Contact the Cisco TAC before performing any disruptive testing or attempting to repair the IGX node,
to ensure that you have isolated the correct problem area and to enable Cisco personnel to provide you
with assistance in performing the necessary procedures. For more information, refer to the “Obtaining
Technical Assistance” section on page xxiii.
Modem not functioning. Modem switched off. Switch on the modem.
Modem power cord disconnected. Reconnect modem power cord.
EIA/TIA-232 cable loose or
disconnected from the Control
Terminal port on the SCM, or from
the modem.
Reconnect the EIA/TIA-232 cable to the Control
Terminal port on the SCM back card or the modem
itself.
Telephone hookup cable
disconnected.
Reconnect the telephone hookup cable.
Modem malfunctioning. Refer to the modem manufacturer's manual.
DIP switches not set correctly. Refer to the modem manufacturer's manual.
Data Frame Multiplexing (DFM) is
not functional.
DFM has been not been enabled by
the Cisco TAC.
Contact the Cisco TAC. For more information,
refer to the “Obtaining Technical Assistance”
section on page xxiii.
DFM has been enabled but does
not function.
DFM only runs on speeds up to
64 kbps.
Readjust the speed.
Background noise or music sounds
choppy.
VAD problem—VDP needs
sensitivity adjustment.
Contact the Cisco TAC. For more information,
refer to the “Obtaining Technical Assistance”
section on page xxiii.
High-speed modem drops to low
speed.
ADPCM is taking over. Contact the Cisco TAC. For more information,
refer to the “Obtaining Technical Assistance”
section on page xxiii.
Bundled (Frame Relay)
connections have failed.
One or more bundled connections
have failed.
Contact the Cisco TAC. For more information,
refer to the “Obtaining Technical Assistance”
section on page xxiii.
Symptom Probable Cause Solution