2-50 Services and Feature Description
6866537D87-F Chapter 2 - MTM800 Product Information Manual September 2008
❏ All AL actions are controlled & logged appropriately in the infrastructure
14.3 Pre-emptive Priority Call (PPC)
If during a call, a call set up is received for a call that has a higher priority than the present call and
the new call is Pre-emptive Priority 3 or Pre-emptive Priority 4 (Emergency), the terminal will release
the present call and join the new high priority call.
If the call priority of the new call is either Pre-emptive Priority 1 or 2, the terminal will either accept or
reject the call based on a pre-programmed setting. If the new call is accepted, an alert tone is
sounded and a high priority call indication will be displayed to alert the user to the new call.
If the terminal has been programmed for pre-emptive call priority and the user initiates a private/
phone call which is rejected, the terminal will display the option to initiate the call again but this time
with pre-emptive call priority. The pre-emptive priority level is set during terminal programming via
the CPS interface.
Benefits:
❏ Allows dispatcher / key personnel to interrupt users engaged in private or telephone calls
without delay
❏ Dispatcher can always get through to critical users: Previously when a dispatcher has an
urgent or emergency situation and needs to immediately co-ordinate people, some users in a
private or telephone call cannot be contacted {send a text message only}
14.4 RF Sensitive Area Mode (Transmit Inhibit Mode TXI)
RF Sensitive Area Mode, also known as Transmit Inhibit (TXI) Mode, is a user selectable mode that
enables the terminal enter areas where radio transmissions are forbidden, e.g. hospitals, airplanes,
etc., where safety can be jeopardized due to the terminal uplink radiation. Once in TXI mode, the
terminal will not transmit under any circumstance and the user will be prevented from initiating any
non-emergency calls or service.
TXI mode is deactivated explicitly by the user, or is implicitly deactivated when the user initiates an
for Emergency call.
The user will be able to enter TXI mode and exit TXI mode via a menu sequence or one-touch
button and upon entry into or exit from the TXI mode and provided that the terminal is ‘camped’ on a
cell, it will send a specially designated SDS Status message to indicate to the system that it is
entering or exiting TXI mode.
The terminal provides user indications when it is in TXI mode.
Mobility procedures that do not require the terminal to send an uplink transmission are performed,
but cell reselection will not be performed even if no registration is required.
In TXI mode the terminal will join group calls for any monitored group(s), but prevents the user from
transmitting on that call. The terminal will also display any incoming SDS messages to the user.
To allow the user to know what calls have been missed, The missed call feature is active in TXI
mode and the terminal will attempt to prevent call setup retransmission from being recorded as
separate calls.
If the user initiates an Emergency call, the terminal will immediately leave TXI mode and start the
Emergency Call.
On power up, after powering down in TXI mode, the terminal offers the user the choice of
continuing in TXI mode.
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