The Control List
244 Manpack Transceiver 2110 series Reference Manual
ALE Call Weighting
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 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.
ALE Golay
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.
The number of error bits per word indicates the quality of the channel used to transmit
the word. Golay testing can detect and correct up to three error bits per ALE word. It can
also detect four error bits, but is not guaranteed to correct all four. Note that excessive
errors can sometimes create false readings.
The ALE Golay entry enables you to specify the number of errors you will tolerate and
correct in this test, which indicates the quality of the channels on which you are prepared
to accept calls. Also see page 242, ALE BER.
ALE Hangup ALL Call
During an ALL call, a link is established implicitly without the receiving stations
responding to the initiating station. When the ALE Hangup ALL Call entry is set to
Enabled, the initiating station sends a link termination sequence when SCAN is
pressed. All stations that entered the link hang up the link and return to scanning when
they receive this sequence.
ALE Hangup Phone Call
During any ALE Phone call, a link is established between the initiating station and the
station with an automated radio/telephone interconnect unit, for example, a Codan 3033
Telephone Interconnect. When the ALE Hangup Phone Call entry is set to Enabled, all
stations receive a link termination sequence when SCAN is pressed at one of the
stations. All stations that entered the link hang up the link and return to scanning when
they receive this sequence. This setting may be required in ALE/CALM networks with
an automatic interconnect unit. If the ALE Hangup Phone Call entry is set to Disabled,
a link termination sequence is not sent when SCAN is pressed at any of the stations in
the link. In this case, a hangup sequence must be sent separately to the radio/telephone
interconnect unit to clear the telephone line, or it hangs up after a timeout period is
exceeded.
CAUTION It is recommended that this entry is not altered from the factory setting.
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