Operation Manual

November 1999
M68333 Rev. A Tel-Link PMP - Sector Terminal Installation & Maintenance Manual 2-1
2.0 Sector Terminal Overview
The PMP network is composed of one or more base stations that are strategically located within the desired
coverage area (refer to Figure 2-1). Base Station/Sector Terminals are located at the center of each cell
and have a radius of up to 10 Km depending on the RF frequency, climate type, desired network availabil-
ity, line-of-sight profiles, and traffic capacity requirements. The Base Station consists of 1 to 24 Sectors. A
sectorized area of a Base Station/Sector Terminal is supported by 1 to 5 Sector Indoor Units (IDUs),
depending on the number of Remote Terminals located in that sector. Each Sector communicates directly
with the Remote Terminal within a sector area of 22.5° to 90° of coverage within the 360° area around the
base station. Each base station also interfaces to the Public Switched Network (PSN) through a high-speed
backbone link.
Figure 2-1 - Example of Simplified Base Station Site
The system utilizes an ATM cell-multiplexed, continuous carrier to transmit data from the base station to the
Remote Terminals. Each sector uses one or more downlink carriers to deliver these cells to the Remote
Terminals. These carriers are transmitted at different frequencies to avoid interference. Either a FDMA or
TDMA scheme is used by the Remote Terminals to transmit information to the Base Station. When FDMA
uplinks are used from the Remote Terminals, each Terminal communicates on a separate frequency chan-
nel with a demodulator at the Base Station for each channel. When TDMA uplinks are used from the
Remote Terminals, multiple remotes share a single carrier by transmitting in designated time slots.