SmartTrunk Systems SmarTrunk II - Centralized vs. Decentralized Trunking Systems

CentrCentr
CentrCentr
Centr
alizaliz
alizaliz
aliz
ed vsed vs
ed vsed vs
ed vs
. Decentr. Decentr
. Decentr. Decentr
. Decentr
alizaliz
alizaliz
aliz
ed Ted T
ed Ted T
ed T
rr
rr
r
unkunk
unkunk
unk
ing Sying Sy
ing Sying Sy
ing Sy
stemsstems
stemsstems
stems
Unlike centralized trunking systems, decentralized (scan based)
systems such as SmarTrunk II do not require exclusive channels.
Because the channel selection intelligence is in the mobiles,
decentralized systems can co-exist with conventional users on the
same channels. When a call is initiated by a mobile unit, the channel
assignment is determined by the logic in the mobile, not by a controller
at the repeater site. So if the channel is busy with a conventional user
(or even a co-channel user on another system), the mobile will consider
the channel as busy and select another channel.
Per FCC rules, all
frequencies of a de-centralized trunked system would use the less restrictive
station class designation of either FB6 or FB2, which does not require a
Protected Service Area (PSA). FB6 is for private carrier systems such as
radio dealers that would place additional users on the system. FB2 is for
private in house systems such as a manufacturing facility that would use the
system for their own use.
The advantages of decentralized system can be summarized as
follows:
¨ Since they do not require exclusive channels, the onerous FCC
frequency coordination requirements described above do not apply.
¨ Decentralized trunking systems have always been “legal” for use below
800 MHz because they fully comply with the FCC requirements to
monitor the channel before transmitting and do not utilize dedicated data
channels for system control.
¨ Decentrallzed trunking is the only trunking protocol which will operate
on non-exclusive channels. This not only allows the system to operate
in the presence of conventional users on the same channel, but it also
allows a system operator to gradually convert conventional users to
trunked operation.
¨ They are more economical due to the lower cost of both the trunking
controllers and the mobile radio equipment.
¨ They require less technical training to install and maintain.
SmarTrunk Systems, Inc.
8