Site Selection; Terrain And Signal Strength; Antenna & Feedline Selection - GE MDS Mercury Series Reference Manual
Wireless ip/ethernet transceiver, covering ap and remote units
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- Setup manual (4 pages) ,
- Reference manual (76 pages)
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05-4446A01, Rev. C
5.1.2 Site Selection
Suitable sites should provide:
• Protection from direct weather exposure
• A source of adequate and stable primary power
• Suitable entrances for antenna, interface, or other required
cabling
• An antenna location that provides a transmission path that is as
unobstructed as possible in the direction of the associated sta-
tion
s
(
)
With the exception of the transmission path, you can quickly determine
these requirements. Radio signals travel primarily by line-of-sight, and
obstructions between the sending and receiving stations will affect
system performance. If you are not familiar with the effects of terrain
and other obstructions on radio transmission, the discussion below will
provide helpful background.
5.1.3 Terrain and Signal Strength
While the license-free 900 MHz band offers many advantages for data
transmission services, signal propagation is attenuated by obstructions
such as terrain, foliage, or buildings in the transmission path. A
line-of-sight transmission path between the central transceiver and its
associated remote site
able communications link.
Much depends on the minimum signal strength that can be tolerated in
a given system. Although the exact figure will differ from one system to
another, a Received Signal Strength Indication (RSSI) of –80 dBm or
stronger will provide acceptable performance in most systems. While
the equipment will work at lower-strength signals, signals stronger than
– 77 dBm provide a fade margin of 15 dB to account for variations in
signal strength that might occur. You can measure RSSI with a terminal
connected to the
COM1
(Ethernet) connector.
LAN
Antennas" on Page 144
5.1.4 Antenna & Feedline Selection
NOTE: The transceiver must be installed by trained professional
installers, or factory trained technicians.
The following text will help the professional installer in the
proper methods of maintaining compliance with FCC Part 15
limits and 1-Watt per MHz ERP requirement.
Mercury Reference Manual
s
is highly desirable and provides the most reli-
(
)
port, or with an HTTP browser connected to the
(See "Antenna Aiming—For Directional
for details.)
151
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