User's Manual

PN 9000-10 Help Hot Line (U.S. only): 1-800-530-9960 5-47
620021-0 Rev. A
Similar coverage is achieved by setting the transmit power per carrier of the 800 MHz
systems to 3 dBm per carrier and those of the 1900 MHz systems to 6 dBm per car-
rier.
The numbers of RF carriers were selected in order to match subscriber capacity
approximately. Because each protocol in the example supports a different number of
voice channels, the RF carrier numbers also differ. As the following table indicates,
the 800 MHz Cellular and shared 1900 MHz systems can support additional RF carri-
ers without decreasing the power per carrier figures.
For logistical reasons, Operators involved in a neutral host system sometimes prefer
not to share equipment with other Operators. From technical and economic perspec-
tives, too, this can be a prudent practice in medium to high-capacity installations.
Though deploying parallel systems appears to increase the amount of equipment
needed as well as the system cost, the trade-off between capacity and coverage must
be considered because, in short, as capacity increases, coverage area per RAU
decreases. Therefore, more RAUs (and perhaps Hubs) are needed to cover a given
floor space.