The Control List
242 Manpack Transceiver 2110 series Reference Manual
ALE AMD Position
AMD data can be sent at different positions within an ALE call. You can set the
transceiver to send it in the leading part of the call, or you can set the transceiver to
automatically select the best place to send the AMD data with the call, in either the
leading or acknowledge part of the call.
With ALE calling, the transceiver may cycle through several channels before a link is
established. If you select Leading, the AMD data is always positioned in the leading
part of the call. The data is transmitted prior to any response from the receiving station. If
the transceiver abandons this channel and moves to the next best channel, it sends the
AMD data again prior to any response being received.
If you select Auto, the transceiver determines the best position for the AMD data in the
call. It may move the AMD data from the leading part of the call, sending it after a
response is received from the other station. Auto is the recommended setting.
ALE BER
ALE control information is sent and received in blocks of data called ALE words. Each
word is sent three times to reduce the effects of fading, interference and noise. When the
words are decoded, the transceiver records the number of errors that occurred in the
transmission.
The number of errors indicates the quality of the channel used. A bit error rate of 0
indicates perfect reception. A bit error rate of 48 indicates that all bits of the ALE word
were bad.
The ALE BER entry enables you to specify the number of errors you will tolerate in this
test, which indicates the quality of the channels on which you are prepared to accept
calls. Also see page 244, ALE Golay.
NOTE
The ALE AMD Position entry is available if you have the MIL-STD-188-
141B ALE option installed (2110 only).
NOTE
The leading position is required for interoperability with older Codan HF
transceivers (firmware earlier than V4.00), and may be required for
interoperability with transceivers from other vendors.
NOTE
The ALE AMD Position entry is only effective in Auto when the
networks used to make the call have their privacy mode set to Plain.
CAUTION It is recommended that this entry is not altered from the factory setting.
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