Specifications

Chapter 4 Troubleshooting and Diagnostics IPmux-1/1E Installation and Operation Manual
4-4 Troubleshooting
4.2 Troubleshooting
Table 4-2 presents the event types as they appear on the Event Log File and lists
the actions required to correct the event (alarm) indication. For further
information, see Chapter 3.
Table 4-2. IPmux-1 Troubleshooting Chart
Fault Probable Cause Remedial Action
E1/T1 equipment connected
to IPmux-1 is not
synchronized with
IPmux-1/1E.
Configuration problems
Physical layer problems
1. Check cables and physical
connectivity.
2. Check IPmux-1 E1/T1 configuration
and, if necessary, other IPmux-1
parameters.
3. Check E1/T1 physical connection
(use loopbacks).
• Slips and errors in
E1/T1/ISDN/FXS/FXO/E&
M equipment
• Ethernet port in switch and
IPmux-1 are not in the same
rate or duplex mode
• Ethernet port is set to work in
half duplex mode (may cause
extreme PDV because of
collisions and backoffs)
• Timing configuration is not
properly set (periodic buffer
under/overflows shown on IP
channel status menu)
• Deactivation employed by NT
when IPmux is TE and in
loopback timing mode
• Network PDV or lost frames
1. Check E1/T1 physical connection
(use loopbacks).
2. Check timing settings according to
explanation in this manual.
3. Check switch and IPmux-1 port
configuration (negotiation, rate,
duplex mode).
4. Check PDV introduced by the
network, and, if necessary, increase
PDVT jitter buffer setting.
5. Check NT deactivation (ISDN BRI).
Echo in voice High delay in voice path 1. Check network delay and try to
decrease it.
2. Try to decrease PDVT (jitter) buffer.