Table of Contents
Advertisement
Capture Percentage - This is the percentage that
squelch is tightened on the second and later passes
when searching for a new locality (LCL SRCH
displayed). This parameter should always be greater
than or equal to the Dropout Percentage, and it ensures
that registration occurs on a stronger locality. The
default level is 46%.
NOTE: The transceiver uses the value programmed
for the locality being sampled, not the value
programmed for the locality which was just dropped.
2.9.5 OVER-THE-AIR LOCALITY CHANNEL
UPDATES
Localities are initially programmed with the
channel numbers of all repeaters currently in use.
These are then the channels that the transceiver can
access when placing and receiving calls. If new chan-
nels are later added to a locality, over-the-air program-
ming is used to update the transceivers with the new
channels. This eliminates the need to bring them in for
reprogramming.
2.9.6 TRANSCEIVER DISABLE
If a mobile is lost or stolen or is being used to
interfere with communication, it can be temporarily or
permanently disabled by the system operator as
follows:
A mobile can be temporarily disabled by trans-
mitting the Sleep command to the unique ID of the
affected mobile. When a transceiver receives this
command, SLEEPING is displayed continuously on
the lower line and no calls can be received or trans-
mitted. However, registration on new localities
continues normally.The transceiver can be re-enabled
again by the system operator by sending an Interrogate
message. This is indicated when the display returns to
indicating normal system/group information.
A mobile can be permanently disabled by sending
the Kill command to the unique ID of the affected
mobile. The transceiver then responds that it has
received this message and then permanently disables
itself. It is then totally inoperative and CALL SVC is
displayed continuously. It must then be brought back
in for reprogramming to make it operational again.
2.9.7 HOME CHANNEL ALIASING
Introduction
The home channel aliasing feature increases the
number of standard group calls programmable on a
locality by allowing calls to be programmed on non-
existent home repeaters. Therefore, instead of being
limited to just the 239 ID codes on each active home
repeater, group calls can be programmed on each of
the up to 20 home repeaters allowed per locality (the
twentieth repeater is usually the status repeater which
is typically not assigned as a home repeater). This
permits up to 20 x 239 or 4780 group calls on each
locality.
The active repeaters on each locality are desig-
nated by locality programming (see Section 3.4.4).
They are programmed with a frequency and have the
Active box checked, while non-existent repeaters do
not have a frequency or this box checked. If repeaters
are later added, they can be added to the locality by
over-the-air programming (see Section 2.9.5).
Operation With Home Channel Aliasing
If a system programmed with a non-existent
home repeater is selected, the next lower active home
repeater is monitored for incoming calls and go-to
repeater information. For example, if home repeater 6
is programmed on the selected system and the active
repeaters are 1, 10, and 20, repeater 1 is monitored. In
addition, all other mobiles on that locality with a
selected system programmed for home repeaters 1-9
monitor that repeater.
If a group call is then placed, the home channel of
the call is the home channel programmed for the
selected system, not the repeater being monitored. The
call is detected like any other group call (it is received
if a system/group programmed for that home repeater/
group ID is selected or scanned).
NOTE: Since this feature does not increase system
capacity, adding too many users may result in unsatis-
factory operation due to frequent busy conditions.
2-24
OPERATION
November 2001
Part No. 001-7240-001
Advertisement
Table of Contents
