RT System 2 v2.3
65
Deployment Guide R01.i
© 2010-2014 Wireless Seismic, Inc. All rights reserved.
4
4.
Point-to-Point Backhaul
4.1 Overview
The backhaul is composed of a number of line station mast/radio/LIUs. The number of
poles pole (masts/towers) in your point-to-point spread must be a multiple of the
number of channels used.
A channel is an 80 MHz wide frequency band with 40 MHz on either side of the center
frequency. For example, if the center frequency is 2.412 GHz, the frequency range for
that channel is 2.372 to 2.452 GHz.
When using a system with six possible channels, the backhaul could have just 6 poles,
or a multiple of 6 poles: 6, 12, 18, 24, and so on.
This section uses an example of six possible channels, and 18 line station mast/radio/
LIUs. Each pole (mast/tower) has two radios and one LIU as shown in the following
figure.
Figure 4–1 Channel – 80 MHz Wide Frequency
Band
NOTE
If using the mast at the recording truck, connect the LIU with an Ethernet or
Fiber cable to the recording truck. If the mast is not used at the recording truck,
the connections shown in the figure to the recording truck are not used.
See “Connecting to the Recording Truck” on page 92 for a radio link (pendant)
option).
