User's Manual Part 1
R01.i RT System 2 v2.3 Deployment Guide 39
© 2010-2014 Wireless Seismic, Inc. All rights reserved.
3. Backhaul
Backhaul Components
3.2.2 LIU Battery
Power is supplied to the LIU components by way of a 12 V DC battery. The external battery is
not supplied as part of the backhaul system.
See the Troubleshooting Guide, Best Practices chapter, LIU Batteries section for instructions
on how to hot-swap the LIU battery.
3.2.3 LIU and WRU Antennas
The following table lists the supported antennas for the LIUs and the WRUs (all models). The
remote and central backhauls use the same antennas:
There is an auto-power-leveling feature built into the firmware. It works in conjunction with
the RSSI parameters to keep the power at a defined level. If the Unit Thresholds
ĺ
Command (or Data) RSSI parameter is set to any number greater than zero, power-
leveling is enabled.
3.2.4 Line Radios
There are two line radio options provided as follows:
i Ubiquiti Bullet – Currently supported for point-to-point (string-of-pearls) backhauls:
Ɣ 5 GHz Radio (US) (56-0019 US)
Ɣ 5 GHz Radio (Intl) (56-0024)
i Ubiquiti NanoStation M5 – Currently supported for point-to-multi-point (star)
backhauls:
Ɣ 5 GHz Radio Assembly (US) (56-0035 US)
Ɣ 5 GHz Radio Assembly (Intl) (56-0032)
The Ubiquiti Bullet line radio is normally used with a directional antenna; however an
omnidirectional antenna is also included. The antennas are attached at the top of the mast
and the radio is attached to the mast at eye level as shown in the following figure.
TIP
The backhaul power requirements vary depending on the hardware in use and
period of use. For example, you may be using one or two radios. Supply enough
power to ensure there is enough power for the entire duration of the time you
are using the backhaul.
Table 3–4 Antenna Specifications, WRU/LIU
Model
Frequency
(MHz)
Maximum Gain
Vertical
Beam Width
Weight
Dimension
(Length x
Diameter)
WSI 65-0204/65-0264
(antenna-standard)
2400 5.5 dBi (50 ohm) 25° 0.4 lbs
0.2 kg
32 x 0.6 in
810.5 x 15 mm
WSI 65-0091
(extender-standard)
2400 0 dBi N/A 0.6 lbs
0.3 kg
30 x 0.7 in
762 x 18.5 mm