Wifi Advisor - Viavi OneExpert DSL User Manual

Appendix A Maintenance and Troubleshooting

WiFi Advisor

WiFi Advisor
Table 46 and
Table 46
Problem
Signal strength and coverage problems
– Attenuation with distance and materi-
als in the home
– 5GHz has shorter reach than 2.4GHz
802.11 interference sources
– Co-channel interference (forces your
AP to share the channel)
– Adjacent channel interference (looks
like noise to your AP)
Non 802.11 Interference sources
– Microwaves, AV transmitters, cordless
phones, baby monitors, etc.
High channel utilization
– The more APs in the channel, the
higher potential utilization
– High utilization, low noise = high
802.11 traffic on the channel
– High utilization, high noise = potential
non-802.11 interferer
802.11 a/b/g devices on your network
– Slow a/b/g PHY rates occupy the
channel longer than modern PHY
rates for the same amount of informa-
tion transfer.
– Old security types (WEP/WEPA1) limit
connection to lower 802.11 rates
Page 226
Table 47 provide some typical issues and resolutions.
Typical Wifi related problems
OneExpert DSL User's Guide
22052280, Rev 006
Action
Look for -35 to -70 dBm
RSSI and >20 dB SNR
Look for < 4 co-channel
interferers and < 3 adja-
cent channel
Observe spectrum for
interferers in the channel
of interest
Look for <35% utilization
+ low noise
Detect and advise
replacement of old gear
November 2015