Service manual

LTR-NET OVERVIEW
6-9
November 2001
Part No. 001-7240-001
When a new locality is located, the subscriber
unit registers on the locality by sending messages indi-
cating its unique ID code and the home channel it will
monitor. The system then knows the location of that
subscriber unit and will automatically route unique ID
calls to the new locality.
Automatic locality search can be automatically
initiated if two consecutive unsuccessful access
attempts occur. This feature is always enabled except
with 8170 portable transceivers where it can be
enabled or disabled by programming.
When a subscriber unit is no longer in service
(power is turned off), a de-registration message is
automatically sent if possible. This prevents the
system from wasting resources trying to reach out-of-
service units. Power is automatically held on until this
message is sent. De-registration is not available with
8170 portable transceivers.
6.7.7 NEW CHANNEL UPDATES
New subscriber units are initially programmed
with the channel numbers of all repeaters at each
locality. These are then the channels that can be
accessed when placing and receiving calls on that
locality. If new channels are later added, the subscriber
units can be updated with the new channels over the
air. This eliminates the need to bring subscriber units
back in for reprogramming. Refer to Section 2.9.5 for
more information.