User's Manual

Fortress ES-Series CLI Guide: Networking and Radio Configuration
54
Other Fortress platform models, with or without 4.4 GHz-radio
options, do not.
NOTE: The MIMO
function
is absent
from CLI
set radio
options and show radio
output on Mesh Points
that do not support it.
MIMO can be enabled only when the radio is configured to use
one of the 802.11n frequency
Band options. MIMO is disabled
by default on all radios that support it.
In order to take advantage of MIMO, both radios forming a
given link must be configured for it. In a mixed network
environment, MIMO-enabled radios will negotiate the best
mutually supported communication with Single-Input Single-
Output (SISO) radios.
Use the interactive
set radio command to configure MIMO on
any radio that supports the function. Or use
set radio with the
-mimo switch with Y and N arguments.
# set radio -mimo Y|N
The command will fail if the radio is not configured to use one
of the 802.11n
-band options.
3.4.6 STBC
Space-Time Block Coding (STBC) is a technique that helps
improve error rates and reliability in a system that is
experiencing poor transmission performance. This
improvement is accomplished by transmitting a stream over
multiple antennas which provides the receiver with multiple
copies of the same data stream. The redundancy in the
transmission increases the range and provides the receiver
with a better chance to receive the complete signal.
NOTE: The STBC
function is absent
from CLI
set radio
options and show radio
output on Mesh Points
that are not capable of
transmitting STBC
encoded signals.
The ES2440-35, -3555, -3444, -34, -3444m, and -34m are
capable of transmitting STBC encoded signals when MIMO is
enabled. When the transmission quality drops below MCS-8
and MIMO is enabled, the radio will transmit STBC encoded
signals. The ES2440-35, -3555, -3444, -34, -3444m and -34m
are also capable of receiving STBC encoded signals.
The ES820-35 and -34 are capable of receiving STBC
encoded signals, but are not capable of transmitting STBC
encoded signals. Transmission of STBC encoded signals is
automatic below MCS-8 on any radio that supports the
function. To force transmitting STBC encoded signals at all
times (even when the radio would normally use a rate higher
than MCS-7), use the interactive
set radio command with the
-forcestbc switch with Y argument. This favors reliability or
range over throughput. The default for
-forcestbc is N.
# set radio -forcestbc Y|N