User's Manual

51
SMARTZONE
OPERATION
Site Switching in SmartZone
Site Switching in SmartZone mainly uses signal
strength to determine whether or not to switch sites.
Other factors used are the radio's preferred site
selection, and whether the radio is site locked or not.
Because the radio knows the site ID, active control
mode, and the signal strengths of its adjacent sites,
the radio is capable of quickly switching sites.
6. Enhanced Automatic Site Switching
SmartZone radios will use RSSI (received signal
strength indication) to determine if the radio
should switch to another site. This is transparent
to the user. In addition, the zone controller contin-
uously transmits adjacent site information to the
radios, so that the radio, at any time, is able to
quickly switch to the next site that has the highest
RSSI rating. This is an enhancement over AMSS
systems.
7. Preferred Site
SmartZone radios can program certain sites to be
always preferred, most preferred, or least pre-
ferred. This gives the user the ßexibility to keep a
radio on a particular site, regardless of the pres-
ence of a stronger signal from an adjacent site.
This also forces the radio to always look for its pre-
ferred site and use it whenever possible.
8. Site Trunking
If the zone controller loses communication with
any site, that site will revert to what is known as
Òsite trunking.Ó While in this condition, radios are
still able to operate in the trunking mode, but
trunking operations are limited to the site only.
9. Enhanced Failsoft Operation
If a site experiences a complete failure, it will
revert to failsoft operation like today's SMARTNET
system. A SmartZone radio, however, can be pro-
grammed to automatically migrate to the lowest
failsoft frequency programmed in its list of 32 con-
trol modes. The radio will periodically scan the
control mode to check for the presence of a valid
control mode (in case the radio roamed into a site
which is trunking).
ATS2500
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book Page 51 Monday
,
December 18
,
2000 7:39 PM