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Introduction
A cellular mobile telephone system divides
the service area into small, low power radio
frequency coverage areas called cells. A cel-
lular system consists of a more or less con-
tinuous pattern of these cells, each having a
1 to 40 mile radius (typically 5 - 10 miles).
Within each cell is a centralized cell site with
an elevated antenna and a building. The
building houses a base station with trans-
ceivers and related control equipment for the
Figure 1. Channel Assignments
A BAND
Primary Control Channels (21):
Secondary Control Channels (21):
Voice Channels...
(395 AMPS / 1185 NAMPS):
Primary Control Channels (21):
Secondary Control Channels (21):
Voice Channels...
(395 AMPS / 1185 NAMPS):
In NAMPS applications, each AMPS voice channel
provides space for three NAMPS voice channels.
Digital cellular multiplexes voice channels to allow for the
possibility of several additional conversations on a single channel.
© 2000 Motorola, Inc.
Cellular Overview
channels assigned to that cell. All the cell
sites within a system are then connected ei-
ther by dedicated land lines, microwave links,
or a combination of both to a central control
site called the central controller or switch .
The switch controls the entire cellular sys-
tem and serves as the interface between the
cellular telephone user and the landline net-
work. Each cell site operates on an assigned
access channel, and may have any number
of paging and voice channels assigned to it.
CHANNELS
667 - 716, and
B BAND
CHANNELS
355 - 666 and
:
NOTE
313 - 333
688 - 708
001 - 312,
991 - 1023
334 - 354
737 - 757
717 - 799
1
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