The Control List
Manpack Transceiver 2110 series Reference Manual 243
ALE Call Scan
The ALE Call Scan entry enables you to set whether or not your transceiver performs a
scan cycle between call attempts. When this entry is set to Disabled, the normal ALE
calling sequence is used, that is, the transceiver attempts a call on the first channel in
accordance with its settings for LBT and number of retries, then tries the next channel,
and so on until the call is successful. The transceiver may miss incoming calls during this
outgoing call activity. When the ALE Call Scan entry is set to Outgoing network, the
transceiver performs a scan cycle between call attempts, scanning the channels in the
network through which the call is being made. When the ALE Call Scan entry is set to
Scanned networks, the transceiver performs a scan cycle between call attempts,
scanning the channels in all the networks in the transceiver that are set to be scanned.
Following the scan cycle, the transceiver checks if the channel for the call attempt is
unoccupied, and if so, attempts the call. If the call is not successful, the transceiver
performs another scan cycle, then either retries the same channel (depending on the value
set in ALE Retries), or moves to the next channel.
ALE Call Scan Cycles
The ALE Call Scan Cycles entry sets the number of times the transceiver cycles through
scanning the channels in the selected network(s) between call attempts.
ALE Call Threshold
When the quality of a channel is tested it is given an LQA score. This score is based on
the results of local and remote measurements for BER and SINAD, and on the call
weighting value set in the ALE Call Weighting entry.
Generally, a score of 25% indicates the minimum acceptable standard for voice
communication. A score of 50% or higher indicates a good channel. The ALE Call
Threshold entry enables you to set:
• the minimum score a channel must achieve for it to be tried in ALE calls
• the minimum acceptable standard for the channel at the time when a link is being
established
The transceiver attempts to make calls on channels for which there is no score, but only
after channels with a score above the threshold have been tried. If there are no channels
that meet the ALE Call Threshold, the call is retried on the channels that provided the
best response during the first attempt.
NOTE
If the ALE LQA Exchange entry is set to Off, remote measurements are
not used.
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