R&S M3SR 4100 Series, Operating Manual

Page: 340 / 706

M3SR Series 4100 Automatic Link Establishment 2
nd
Generation (ALE-2G)
4.4 Operating Manual 6175.4760.02 – 01
4.3.1.4 ALE-2G Calls
The operator can initiate calls in the preselected call type (scan rate or fixed) and traffic type
(link mode) to the preselected destination address in one of the following ways:
• Pressing the call button
• Asserting PTT
• Presence of data on the data interface.
The operator may make a call at a scan rate of 2 chnPs or 5 chnPs where ALE uses the
channels of the currently selected next call scan group to place the call.
Or the operator may wish to make a call in fixed mode where ALE makes the call on a pre-
selected channel.
Individual Calls (Point-to-Point Connection)
Individual Calls are used to establish a link with another station (point-to-point connection).
The operator may make a call to the selected individual station at a scan rate of 2 chnPs or
5 chnPs, where the radio uses the stored LQA information to select the best channel on
which to attempt to make the call. With this type of call, the radio will attempt to call a station
on each channel in the currently selected next call scan group until link establishment is suc-
cessful. The call will be attempted first on the best channel, proceeding to the second best
and so forth, until a link is established or all channels in the scan group have been tried.
The operator may also make a call by first selecting a channel on which to call (scan rate
fixed).
Net Calls
A Net Call is a call made to all participants in a particular net.
Following the call, each net participant station responds only in its particular time slot. The
time slot is determined by where that station's address appears in the list of net participants.
For this reason, all participants in the net must be listed in identical order in each station of
the net.
Group Calls
For a Group Call first all stations to be called have to be selected. The called stations pick
out the time slot for their response following the sequence in the call list.
All Calls (Broadcast Calls)
An All Call is a broadcast call which is not directed to a specific station.
If the scan rate is set to FIX, the All Call is made on a particular channel. At scan rate 2 chnPs
or 5 chnPs the All Call is made on the first channel in the selected scanning scan group.
Whether a station actually sets up a link when receiving a broadcast call, is up to configura-
tion.