WIDE AREA FAILSOFT BY TALKGROUP

As today's trunked systems continue to grow, and A typical wide area communications system, such with the birth of wide area systems such as as SmartZone, is shown below. The system contains SmartZone, it has become necessary to devise new multiple sites, each with 'a set of unique frequencies methods of operating in the fallback communica- that are trunked to provide communication to the tion mode of failsoh. The method described here radio users. offers a solution to operate in failsofi by talkgroup for wide area systems.

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MO-OLA Technical Developments Volume 23 October 1994

WIDE AREA FAILSOFT BY TALKGROliP

by Timothy Reilly, William Felderman and Daniel Mcpon&ld

INTRODUCTION HISTORY

  As today's trunked systems continue to grow, and A typical wide area communications system, such with the birth of wide area systems such as as SmartZone, is shown below. The system contains SmartZone, it has become necessary to devise new multiple sites, each with 'a set of unique frequencies methods of operating in the fallback communica- that are trunked to provide communication to the tion mode of failsoh. The method described here radio users.
offers a solution to operate in failsofi by talkgroup
for wide area systems.

Fixed End n 1 ..~ I

Control and

Audio

A Typical Wide Area Smartzone System

In today's wide area systems, failsoh communi- cation can be accomplished in one ofthree ways:

1. When a subscriber must enter failsoft, it will only monitor for failsotl information on those frequen- cies that are programmed as control channels in the radio. This is an automatic procedure, but it puts all of the subscribers on the same frequency at the site.

2. Each talkgroup has an associated failsot? liequency

to monitor when the radio has determined that failsotl is necessary. This takes up large amounts ofmemory in the radio as the number oftalkgroups increases.

3. The subscriber user must select the appropriate personality in the radio~,that has been programmed to contain the failsofl frequency for the user's loca- tion. If the user can be in many locations through- out a large wide area system, there is inadequate memory in the radio to contain all of this infor-

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MOTOROLA Technical Developments Volume 23 October 1994

mation. It is also a cumbersome, manual proce- dure from the user's p...