Installation Considerations; Radio Frequency Properties Of The Msm317 - HP MSM317 Deployment Manual

Comparing 1x1 wall
jack solutions
When comparing wall jack
solutions that support one
spatial stream (1x1
configuration), 802.11n
enabled devices can deliver
higher throughput, but there
are limitations in the
implementation of the
standard. This is due to the
RTS/CTS overhead that
occurs when servicing
legacy clients, which
prevents a 1x1 device from
using a 40 MHz channel.
The throughput comparison
chart shows in real-world
terms the difference in
performance between a 1x1
b/g and an 11n wall jack
solution. As the chart shows,
the difference in data rates
between the two is small
and becomes even less
significant when you factor
in RTS/CTS overhead.

Installation considerations

Proper planning and configuration of the MSM317 are critical for providing high-quality wireless
service. This section provides an overview of the radio frequency properties of the MSM317,
considerations for setting output power and data rates, and guidelines for where to install the unit.

Radio frequency properties of the MSM317

The MSM317 features a built-in 802.11 b/g radio with two integrated 2.4 GHz omnidirectional
antennas. This helps to produce the strongest possible signal and reduce leakage between rooms. The
signal propagates away from the wall on which the unit is mounted, resulting in reduced radiation
from the back of the device and less risk of interference with the adjacent room.
Figure 5: Comparison of actual throughput between an 802.11n and 802.11g 1x1 device.
7