TD 92685EN
28 June 2012 / Ver. A
Troubleshooting Guide
Ascom i62 VoWiFi Handset
35
5. The VoWiFi Handset as
5.2.4 Range Beep
A quick an easy way to check system coverage is to use the Range beep function. A b
eep is
played in the handset whenever the handset measures a filtered field strength of below the
configured value (default -70 dBm) from the currently associated AP.
To use the function, perform the fo
llowing steps:
1 Open the handset Si
te survey tool using the shortcut *#77#.
2From the Site survey tool menu,
select the menu item Range beep and press the
handset Select button
3 Enable the range beep function by selecting the On rad
io button. Press the handset
Back button.
4From the Site survey tool menu,
select the menu item Range beep level.
5In the Level (-dB
m) field, enter the roaming threshold that the system is planned for.
Ascom recommend -70dBm.
6 Walk through the site at a slow pace. If the RSSI for the handset drops below the
value of the range bee
p level from the currently associated AP, the handset beeps.
Note: Occa
sional single beeps with a long interval in between is fairly normal as the
handset moves through the edges of AP coverage areas. However, prolonged periods
of repeated beeps point to coverages issues that need to be investigated.
Note: The roam
ing behavior is different between idle and call modes as described in
the sections 3.6.1 Idle Mode on
page 18 and 3.6.2 Call Mode on page 18 so the result
of the coverage test will most likely differ when
used in call and not. If the beep level
is set to < -70dBm and the handset is in idle mode, the handset beeps at every roam
because the roam level is set at -70bBm in idle mode.
Note: Because
the measured field strength the value is filtered, sudden drops in field
strength caused by the environment, for example walking through a door into a
room, can be delayed. It is therefore important to walk through the site slowly to
ensure that all weak spots are covered.
5.2.5 Coverage and Roaming Test
The purpose of the test is to verify that a handset is ab
le to roam between different APs
without losing connectivity or experiencing interruptions or distortions to the voice quality.
The support engineer makes a call from a handset that can be physically moved around to
another handset in a fixed location and then physically moves through an Extended Service
Set (ESS).
1 Make a call from a handset that can be physically m
oved around to another handset
in a fixed location.
2 Place a radio or other audio source playing music next to the handset at the fixed
loc
ation.
Note: To be a
ble to hear roaming delays, interruptions or distortions, a continuous
audio source from a radio or MP3 player is recommended. A conversation between
two people often consists of up to 50% of silent intervals and would not therefore be
suitable for the test.
3 Walk around the site to find spots wi
th weak coverage.
Note: Make sure t
hat the walk takes place both directions to ensure that the handset
has roaming options whenever the field strength drops low.
4 Make detailed notes of any areas where coverage is insufficie
nt.
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