TD 92930EN
13 December 2013 /Ver B
Configuration Manual
WL3 and WL3 Plus WLAN Handset
74
10. Troubleshooting
Voice quality is bad
Increased traffic load or
interference.
1) Check if QoS is working in both
directions. Voice traffic should be
prioritized on both the LAN and
the WLAN.
2) Connect to other phones
(wired, analogue or external) to
define if it is the other end that
may cause bad quality.
3) Do a site survey and check for
areas with under/over coverage
and other interfering 802.11
systems.
4) Do a network performance test
to ensure the wired LAN/
backbone has adequate capacity.
5) Use a spectrum analyzer and
look for non 802.11 interference.
Battery life is bad
DTIM might not be set
correctly.
U-APSD is not used.
Cisco/Ekahau location
client settings need to
be changed.
1) Check “Beacon interval” and
“DTIM” settings in the AP.
2) Verify the coverage, since low
signal strength will make the
handset to constantly search for
other APs and thereby consuming
more power.
3) Use a sniffer and check the
amount of broadcast traffic that is
transmitted on the WLAN.
4) Check if correct models of the
chargers are used.
5) Verify with another battery.
6) If the system is supposed to
use U-APSD for voice calls check
the voice power save mode
parameter in the WinPDM.
7) If using Cisco/Ekahau location
client, change the settings.
Fault
Probable cause
Action or comment