MULTI-NET SYSTEM OVERVIEW
5-3
Revised February 1997
Part No. 001-9750-005
5.2 DEFINITIONS OF MULTI-NET TERMS
Conventional System -
A type of radio system that is
licensed to operate on only a single channel. There is
no automatic access to several channels.
Home Repeater -
All Multi-Net mobiles have one of
the site repeaters assigned as their “home” repeater.
When standard dispatch (group) calls are placed, the
home repeater and group ID code identify the mobile
or group of mobiles that receive the call.
Logic Trunked Radio (LTR) -
This E.F. Johnson
radio system provides the basis for the Multi-Net radio
system. Both LTR and Multi-Net systems utilize a
channel management concept called trunking (see
“Trunked Radio System” which follows). Logic
circuitry in the mobile transceivers and repeaters
controls trunking. It continually monitors the system
and generates data messages which update the mobiles
and repeaters as to which repeaters are free and which
mobiles are receiving calls.
Mobile -
This term refers to a transceiver mounted in a
vehicle but it can also be applied to other types of
transceivers because they all operate basically the
same. The other types of transceivers are portables and
control stations. A control station is essentially a
mobile transceiver used at a stationary location such as
at an office site.
Monitor Repeater -
This is the repeater that a mobile
is currently monitoring for update messages. This
repeater may be either the mobile's home repeater or
the site status repeater. When a mobile is not receiving
a call, it continually monitors the update messages for
incoming call and free repeater information. When
making a call, the mobile may be trunked to any of the
site repeaters that are not busy.
Multi-Net System -
An advanced radio system which
provides enhanced operating features such as auto-
registration (roaming), busy queuing, emergency
messages, and priority access. It utilizes trunking
similar to an LTR system.
Public Safety -
A radio service used by the Local
Government, Police, Fire, Highway Maintenance,
Forestry Conservation, and Special Emergency Radio
services.
Radio Network Terminal (RNT) -
The RNT together
with the System Management Module provide control
of a Multi-Net system. The RNT can interconnect
several different forms of communication to form a
communication network. Refer to Section 5.1.4 for
more information.
Selectable Group -
Each selectable system can be
programmed with several selectable groups. Each
selectable group contains ID codes which specify the
mobile or group of mobiles being called, which calls
are received, and other call information (see Section
3.3.4).
Selectable System -
This usually refers to one of the
systems selectable by the transceiver System Select
function. Each selectable system can be programmed
with a unique set of operating parameters such as
home repeater, group ID codes, and unique ID (see
Section 3.3.4).
Site -
Repeaters that are physically located together
and connected to the same high-speed data bus.
Specialized Mobile Radio System (SMRS) -
A
conventional or trunked radio system owned by an
entrepreneur who makes a profit by selling service on
the system. The entrepreneur is licensed for a base/
mobile relay facility and all users of mobiles or control
stations on his system are licensed as SMRS “users”.
The entrepreneur can also be licensed as a user on his
own system. An SMRS may provide service to any of
the radio services in the Public Safety and Industrial/
Land Transportation (PSIT) categories. In addition, the
Federal Government and individuals may be licensed
to use an SMRS.
Status Repeater -
One Multi-Net repeater
at a site is
designated to transmit update information for all calls
occurring at that site. This repeater is also available for
voice traffic, but is not assigned as a home repeater for
any mobiles because none of its mobiles would have
home channel backup (see Sections 5.3 and 5.4).
Trunked Radio System -
A radio system which
utilizes multiple radio channels and automatic channel
switching to allow all system uses to access any
channel that is not in use. This results in minimum
waiting to make a call and maximum utilization of
system channels.
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Страница 169: ...Revised January 1995 Part No 001 9750 003 10 12 DISPLAY BOARD SCHEMATIC ...
Страница 170: ...Revised January 1995 Part No 001 9750 003 10 13 DISPLAY BOARD TOP VIEW DISPLAY BOARD BOTTOM VIEW ...
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Страница 188: ...Revised January 1995 Part No 001 9750 003 10 31 REMOTE TRANSCEIVER INTERCONNECT SCHEMATIC ...
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