TD 92685EN
28 June 2012 / Ver. A
Troubleshooting Guide
Ascom i62 VoWiFi Handset
34
5. The VoWiFi Handset as
The RSSI information is displayed directly in the handset display as shown in figure 13:
Figure 13. Handset SSID DIsplay
Note: In the example display above, the handset is in power save mode as indicated by the
“P” following the RSSI and channel number of the associated and previously associated AP.
A handset is in active mode is denoted by “A”.
To turn off the RSSI display, reenter the shortcut *#76#.
5.2.2 Creating Heatmaps
As a part of a troubleshooting procedure, it can be very useful to use the sit
e survey tool to
help create a graphical representation, or heatmap, of RF signal strengths surrounding an
AP. The handset can be used to create a heatmap by sampling RF signal strengths in the
vicinity of an AP and then superimposing these values on to a building plan where the exact
location of the AP is shown. Several values can be selected for the handset Beep range and a
heatmap of signal strengths can be drawn by repeated sampling. For additional information,
see section 5.2.4 Range Beep on
page
35.
5.2.3 Evaluate the Radio Environment
This section describes how to use the Site survey tool to evaluate the VoWiFi syst
em RF
environment.
Preparations in PDM or Device Management
1 When performing a site survey on the 2.4GHz band make sure that parameter
8
02.11b/g/n channels are set
to “All”. The default is “1,6,11”.
2 Set the World mode regu
latory domain setting parameter to USA, ETSI or other listed
countries.
Note: To scan channel 1-11, set the World mode regulatory domai
n setting
parameter to “USA”. If the scanning of channels 12-13 is also of interest, set the
parameter to “ETSI”.
3 Open the handset Si
te
survey tool using the shortcut *#77#.
4 Perform a site survey by selecting the follow
ing options from the site survey tool
menu:
“Scan all channels”: Returns a list of APs discovered for all availab
le ESSIDs.
“Scan selected channel”: Enter the required chan
nel. This option returns a list of all
the APs found on that channel regardless of ESSID.
Note: Be sure
to walk slowly. Since the value is filtered sudden drops in field strength
caused by the environment, for example walking through a door into a room, will be
delayed. Thus it is important to walk slowly through the site to cover all weak spots.
Note: Se
e also the section 5.2.2 Creating Heatmaps on pa
ge 34.
Note: It is important t
o remember to restore the handset to the channel and
regulatory domain settings previously used if these were modified in steps 1 and 2 of
this procedure.
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