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NAL Research Corporation (TN2012-02-V1.0)
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where:
<adj_required>:
The adj_required flag indicates whether the user needs to adjust the L-band antenna position to
improve reception.
0
Adjustment no longer required
1
Adjustment required
The “+ADJANT:1” message will be sent up to three times, at 5-second intervals, if Layer 1 is
attempting to acquire an L-band bearer but is unable to receive the BCCH transmission from the
SV, whether the attempt is due to an MT call (prior to RING indication), MO call, or Location
Update etc.
It is an indication that the user needs to deploy the antenna or adjust it to a better
orientation/location.
Note that if the acquisition fails or succeeds, there will in most cases be a subsequent
“+ADJANT:0”, but this is not guaranteed in all cases.
A.8.113 +WANTST, +ANTST – Antenna status
Exec Command:
+WANTST
This command causes the A3LA-RS’ internal state-change history to be deleted, so that the next
time it polls the antenna status, a +ANTST:<ant_status> unsolicited message will be generated
regardless of state.
A result code (normally “OK”) will be returned immediately, and the +ANTST:<ant_status>
message will follow later (potentially much later – see below).
Unsolicited Announcement:
+ANTST:<ant_status>
where:
<ant_status>:
0
Built-in antenna is stowed
1
Built-in antenna is deployed, or an external antenna (via docking cradle) is
connected, and the built-in antenna is disconnected so its stowed/deployed status
is irrelevant
The +ANTST:<ant status> message will be sent whenever internal polling indicates that the
antenna status has changed, or on polling after +WANTST has been received regardless of
whether the state has changed or not. An initial state of ‘stowed’ can be assumed, but
+ANTST:<ant status> will be sent shortly after initialization with the actual status in any case.
Internal polling will measure the deployment and docking detector states before any overall
state change is announced.
Note that internal polling occurs on each main receiver receive activity, i.e. once per 90ms
during a call, at least once every 4.3 seconds while monitoring a Ring signal, and as
infrequently as once every 2 minutes when performing Ring searches with no signal present.