TD 92685EN
28 June 2012 / Ver. A
Troubleshooting Guide
Ascom i62 VoWiFi Handset
32
4. Factors Affecting RF
If using a bottom-up approach the same or similar questions as above can be used. In this
approach the functionality of the radio is tested first (L1) and then continues upwards to
check the access to the WLAN, then the LAN and last the services in that order.
When to use a top-down or bottom-up approach depends
on which approach defines the
problems fastest. To decide that, it is recommended to ask the following three questions:
• What information is available in the fault report
?
• Has the problem been seen before?
• Are there well-known solutions to t
he problem?
The support engineer should be fam
iliar with the handset startup-process as some issues
may be due to initialization problems as the handset starts up. For additional information,
see chapter 3.3 Handset Startup Procedure on pag
e 12.
The support engineer should also be familiar with ot
her typical questions used in
troubleshooting. Examples of such questions are:
• Does the wired VoIP phone work?
• Has there been any redesign or equipment change in the insta
llation?
• Has this problem been seen before?
Is the fault on more than one
h
andset when used at a specific
location?
1-3 Yes: The problem is in the AP and
the network at that location or all
handsets may be faulty.
No: Check the spe
cific handset
configuration, for example,
Differentiated Services Code Point
(DSCP), channels used, power-save
mode.
Question Layer tested Result
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