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Powering Options
The T811-CM supports AC power over cable (POC). 60 to 90 VAC POC is used when the T811-CM is
powered via an F-type coaxial cable connected to the HFC cable plant.
Performing a Site Survey
Perform a site survey to determine the optimal T811-CM placement for maximum range, coverage,
and network performance. Ruckus Wireless Support can supply site survey best practices
information.
The location and orientation that you choose for the T811-CM play a critical role in the
performance of your wireless network. In general, Ruckus Wireless recommends installing the
T811-CM away from obstructions and sources of interference and ensuring that the AP's best
coverage zone is pointing in the general direction of its wireless clients or associated bridge units
as described in
When performing a site survey, consider the following factors:
• Data rates: Range is generally inversely proportional to data rates. The maximum radio range is
achieved at the lowest workable data rate. Higher data rates are generally achieved at closer
distances.
• Antenna type and placement: Proper antenna configuration is a critical factor in maximizing radio
range. As a general rule, radio range is increased by mounting the radio higher off of the ground
with the AP oriented so that the dome is tilted down. (For recommended orientation examples,
refer to
T811-CM Omni Antenna
• Physical environment: Clear or open areas provide better radio range than crowded or filled areas.
The less cluttered the operating environment, the greater the wireless range.
• Obstructions, building materials, and sources of interference: Physical obstructions, such as
concrete pillars, steel beams, buildings and trees, can block or hinder wireless communication.
Avoid installing the T811-CM in an environment where there is an obstruction between sending
and receiving devices. A number of machines and electronic devices that emit radio waves –
cranes, wireless phones, microwave ovens, and satellite dishes – interfere with and block wireless
signals. Building materials used in construction also influence radio signal penetration. For
example, drywall construction permits greater range than concrete blocks.
• Mounting: The T811-CM is designed to clamp onto a 1/4" to 3/8" (6.35mm to 10mm) support
wire. The hangers allow a 2" bundle of cables between the support wire and the T811-CM.
• Power and backhaul connections: The T811-CM needs a backhaul connection to the CMTS
and it needs to be close enough to an AC power injector on the CATV cable to assure that it is
able to pull 60-90VAC. If not, then another power injector must be installed closer to the T811-
CM. If SFP backhaul is used, POC will still be used for delivering power over the cable, even if
the data is transmitted over the SFP fiber cable.
When you are finished planning the installation, continue with
Positioning the GPS Antenna
The T811-CM AP includes an internal GPS antenna. If the AP is to be used with the optional
GPS feature enabled, then the GPS antenna must be mounted outdoors and have as clear
a view of the sky as possible (as close as possible to 360 degrees, and with no obstructing
trees or buildings). The GPS antenna must not be installed where it can be covered with
T811-CM AP Installation Guide, 800-71436-001 Rev A
T811-CM Omni Antenna
Coverage.)
Coverage.
Installing the
Planning the T811-CM Installation
Powering Options
T811-CM.
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