User's Manual

SR1520 Installation and User Guide Page 10
SR1520 Installation & User Guide Ver. 0.01
1.1.5 Radio Interference
The avoidance of radio interference is an important part of wireless link planning. Interference is caused
by other radio transmissions using the same or an adjacent channel frequency. You should first scan your
proposed site using a spectrum analyzer to determine if there are any strong radio signals using the
802.11a/n channel frequencies. Always use a channel frequency that is furthest away from another signal
and change the physical location of the device.
1.1.6 Weather Conditions
When planning wireless links, you must take into account any extreme weather conditions that are
known to affect your location. Consider these factors:
 Temperature — The SR1520 is tested for normal operation in temperatures from -33°C to 55°C.
Operating in temperatures outside of this range may cause the unit to fail.
 Wind Velocity — The SR1520 can operate in winds up to 90 miles per hour and survive higher wind
speeds up to 125 miles per hour. You must consider the known maximum wind velocity and direction
at the site and be sure that any supporting structure, such as a pole, mast, or tower, is built to
withstand this force.
 Lightning — The SR1520 includes its own built-in lightning protection via chassis grounding.
However, you should make sure that the unit, any supporting structure, and cables are all properly
grounded. Additional protection using lightning rods, lightning arrestors, or surge suppressors may
also be employed.
 Rain — The SR1520 is weatherproof. Also, prolonged heavy rain has no significant effect on the
radio signal. However, it is recommended to use weatherproof boots on cables connecting to the
SR1520 or to apply weatherproof sealing tape around connectors for extra protection. If moisture
enters a connector, it may cause a degradation in performance or even a complete failure of the link.
 Snow and Ice — Falling snow, like rain, has no significant effect on the radio signal. However, a
buildup of snow or ice on antennas may cause the link to fail. In this case, the snow or ice
1.2 Ethernet Cabling
When a suitable antenna location has been determined, you must plan a cable route from the SR1520
wireless router outdoors to the equipment indoors. If a power injector/adapter module is used, it is for
indoor installation only. Consider these points:
 The Ethernet cable length should never be longer than 90 m (295 ft)
 Determine a building entry point for the cable
 Determine if conduits, bracing, or other structures are required for safety or protection of the cable
 For lightning protection at the power injector end of the cable, consider using Surge protectors.
Example installations are shown below.