RAD Data comm Vmux-210 Specifications Page 158

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Chapter 6 Troubleshooting and Diagnostics Installation and Operation Manual
6-16 General Troubleshooting Vmux-210 Ver. 1.1
6.4 General Troubleshooting
Table 6-8. General Troubleshooting
Trouble Symptoms Possible Cause Recommended Course of Action
All front panel indicators
are OFF
The unit is not receiving power Check that power is supplied to
the unit.
Check the fuse and replace it if
necessary.
Intermittent voice Low input voice may be intermittently
identified as silence, and consequently
suppressed by the DSP
Adjust gain levels (Tx and Rx).
Poor voice quality,
garbled speech
1. Check if there is packet loss in the
network (Monitoring>Statistics>
Bundles>Packets Tracking)
Check why network is discarding
packets. (Some possibilities are:
excessive network jitter, massive
mis-ordering, faulty network
equipment, mismatch in
Ethernet rates somewhere in the
network (e.g. the Vmux is set to
Auto Negotiate while the
switch/router is forced to a
specific rate that is not
10MbpsHalf, the default fallback
in case the other party does not
Auto Negotiate as well).
2. Look for HDLC layer errors (CR, AB, NO
etc.) on uplink if Serial/E1/T1 (TDM/Serial
Uplink Statistics).
Check clocking, cabling, and
physical interfaces between
Vmux and the TDM network.
3. Verify that the uplink bandwidth is
sufficient. For Serial/E1/T1 uplink, check
the Maximum Bandwidth under
TDM/Serial Uplink Statistics. For Vmux-
2100 with Serial/E1/T1, retrieve the
stat.dat file (by TFTP) and examine the
4-day uplink bandwidth graph using the
VmuxStat.exe application.
Adjust Bandwidth Control
parameters (Vmux-2100).
Increase uplink bandwidth if
possible.
Voice is distorted and
undergoes an extremely
high delay (several
seconds), syllables are
excessively prolonged
Serial uplink bandwidth may be insufficient Increase Serial uplink bandwidth.
Frequent single clicks are
heard
Check the clocking configuration between
the PBX and the remote Vmux-2100/110
Set the PBX to provide clock and
Vmux-2100/110 voice module to
LBT, or set the PBX to receive
clock and Vmux-2100/110 voice
module to INTERNAL.
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