User's Manual

SETTINGS
SETTINGS > CALLING > ALE
E
NVOY™ TRANSCEIVER REFERENCE MANUAL 227
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
Generally, a score of 25% indicates the minimum acceptable standard for voice
communication. A score of 50% or higher indicates a good channel.
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.
Range: 0 to 100
Default value: 25
Related links:
ALE Call Weighting on page 227
ALE LQA Exchange on page 229
ALE Call Weighting
The ALE Call Weighting entry weights the LQA score of ALE channels for data or
voice.
When the quality of a channel is tested it is given an LQA score. The ALE Call
Weighting entry enables you to weight the scoring process according to the use of
the transceiver for voice and data communication. For example, if the transceiver is
used to make voice calls, you would select Mostly voice.
When Lowest acceptable is selected, the transceiver attempts a call on the channel
with the lowest frequency (with an LQA score above the set threshold), then attempts
the channel with the next higher frequency and LQA score etc, until a link is
established. In some situations where propagation distances may be less than a few
hundred kilometres, weighting the LQA scores in this way increases their
effectiveness.
Available values: Data only, Mostly data, Data and voice, Mostly voice, Voice only,
Lowest acceptable
Default value: Mostly voice
ALE Golay
The ALE Golay entry sets the value of the Golay threshold used in Golay testing.
ALE control information is sent and received in blocks of data called ALE words.
After a word is received, BER tested and accepted, the transceiver performs a Golay
test to check it for errors, and correct it if necessary.