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NEC MH150/MH160 Mobile Handset Administration Guide - Revision 2
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Troubleshooting
On occasion, you may run into transmission problems due to any
number of factors originating from the wireless LAN. NEC MH150/MH160
Mobile Handsets can exhibit transmission problems in several ways.
They can cease functioning properly, display error messages, or display
incorrect data. When using and troubleshooting handsets, consider the
following problem sources to determine the best method of approaching
any specific situation.
Access Point Problems
Most, but not all, handset audio problems have to do with AP range,
positioning, and capacity. Performing a site survey as described in this
document can isolate the AP causing these types of problems. If the
handset itself is suspected, conduct a parallel site survey with a handset
that is known to be properly functioning.
In range/out-of-range
Service will be disrupted if a user moves outside the area covered by the
wireless LAN APs. Service is restored if the user moves back within
range. If a call drops because a user moves out-of-range, the handset
will recover the call if the user moves back into range within a few
seconds.
Capacity
In areas of heavy use, the call capacity of a particular AP may be filled.
If this happens, the user will hear three chirps from the handset. The
user can wait until another user terminates a call or move within range
of another AP and try the call again. If a user is on a call and moves into
an area where capacity is full, the system attempts to find another AP.
Due to range limitations, this may be the same as moving out of range.