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•
Current LTR subscriber units can remain in service
and LTR-Net subscriber units added gradually. This
makes upgrading to LTR-Net very convenient and
less costly.
LTR-Net Subscriber Units Operating on LTR Systems
•
LTR-Net subscriber units can be programmed for
LTR operation. Therefore, they can place and
receive LTR group and telephone calls in the normal
manner.
•
Enhanced LTR-Net features such as roaming and
unique ID calls are not available to LTR-Net
subscriber units operating on LTR systems.
6.1.3 LTR-NET FEATURES
Networking
•
Multiple LTR-Net and LTR localities may be linked
together to provide wide-area coverage.
•
LTR-Net subscriber units can roam between LTR-
Net localities and register and de-register automati-
cally when entering and exiting.
Calls from one type of subscriber unit can be
patched to another type of subscriber unit at another
locality. For example, an LTR-Net subscriber unit
could talk to a conventional subscriber unit. Calls can
even be cross-band, for example, an UHF conven-
tional subscriber unit could talk to an 800 MHz LTR-
Net subscriber unit.
Special Calls
•
Unique ID (UID) - Calls to be placed to specific
subscriber units in the same locality or some other
locality.
•
Directed Group - Calls can be placed to any group
in the same locality or some other locality.
•
Telephone - Calls can be placed over the public
switched telephone network (PSTN).
•
Data - Data can be transmitted to specific location
selected by unique ID code (not currently available).
System Control
•
When new channels are added to a locality,
subscriber units can be updated with those channels
over the air. This eliminates the need to bring them
back in for reprogramming.
•
Over-the-air subscriber unit programming allows
the ID codes of up to 99 systems and 99 groups to be
changed.
•
The system/group currently selected by a subscriber
unit can be changed over the air.
A temporary UID keyed to the ESN can be assigned to
a subscriber unit when it roams to a new radio system
(this feature has not yet been implemented).
•
Unauthorized subscriber units can be temporarily or
permanently disabled.
•
A subscriber unit can be interrogated to determine if
it is currently in service. It can also be interrogated
for its ESN or unique ID code (see following).
Security
•
Each LTR-Net subscriber unit is assigned a unique
Electronic Serial Number (ESN), and no two
subscriber units in existence should have the same
ESN. This number can be interrogated as stated
above and is used for such things as assigning a
temporary UID.
•
Over 65,500 unique ID codes can be assigned in
each system. Each subscriber unit in a locality is
usually assigned a different unique ID code
although more than one can have the same code if
desired.
•
Unique ID and group validation (by home repeater/
group ID) is performed. If an unauthorized ID is
detected, the call is terminated.
Miscellaneous
•
Home channel backup is provided by the use of a
status channel at each locality. The status channel
can be used for voice traffic the same as normal
channels, but is usually not assigned as a home
channel.
6-2
LTR-NET OVERVIEW
November 2001
Part No. 001-7240-001
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