Installation Manual

Tsunami Multipoint Version 1.3 Installation Guide
Channel/Frequency Plans
Tsunami Multipoint offers several frequency plans to provide a means for overcoming interference. If one
part of the 5.8 GHz spectrum is occupied when you deploy the product, you can select a different
frequency plan to bypass the interfering frequency. Plan 4 is the default. Operating frequencies in the 5
and 6 plans overlap. See “Change the Frequency Plan and Operating Frequency” on page 50 for more
information.
Bandwidth
The Tsunami Multipoint offers four modulation modes: QAM16 (60 Mbps), QAM8 (40 Mbps), QPSK3Q (30
Mbps), and QPSK1H (20 Mbps) with equal bandwidth occupancy (3 dB BW at 20.75MHz, 26dB BW at
26MHz). Downlink and uplink signals are divided into time slots, with the number of slots per frame
varying, depending upon the current modulation mode and data rate. Furthermore, the ratio of slots
assigned to downlink and uplink is commandable (within limits; see “setFirstInboundSlot” in the Tsunami
Multipoint Version 1.3 Reference Manual for details)
Tx Power and Antenna Specifications
See “Tx Power,” “txPowerLevel,” and “Antennas” in the Tsunami Multipoint Version 1.3 Reference
Manual.
Power Control
Each SU automatically adjusts its transmit power so the strength of its signal at the BSU does not exceed
the limitation imposed by the Inbound Power Control (IPC) margin. This ensures fair access for all SUs
regardless of distance from the BSU. In addition, IPC can be increased to overcome interference. See
the “IPC” command in the Tsunami Multipoint Version 1.3 Reference Manual for more information.
Chapter 1. Site Planning 15
CPN 63179 Issue Date: 01/24/03