Allied Telesis AT-WA7501 - Manual (Page 61)

AT-WA7500 and AT-WA7501 Installation and User’s Guide
61
Positioning
Antennas for
802.11g, 802.11b,
and 802.11a
Radios
The 802.11g and 802.11b radios have two ports: one is a transmit/receive
port (primary) and the other is a receive-only port (secondary). The
802.11a radios have two ports; both ports are transmit/receive ports. Allied
Telesyn recommends that you use two antennas for optimal performance
of the radios. If you only attach one antenna to the 802.11g or 802.11b
radio, you must attach it to the primary port.
Use antenna connectors 1 and 2 or 3 and 4 to attach antennas to the
send/receive ports.
Positioning Antennas for Dual Radio Access Points
The recommendations in the previous table apply to omni antennas; if you
are using directional antennas, you should increase the recommended
separation between the antennas:
ˆ If your access point has two 802.11g, two 802.11b, or two 802.11a
radios, position the antennas for one radio at least 3.05 m (10 ft) from
the antennas for the other radio.
ˆ If your access point has at least one 802.11g, one 802.11b, or one
802.11a radio (the other radio may be any radio), cable the antennas
for the radio at least 3.05 m (10 ft) from the access point.
ˆ If your access point has an 802.11a full-range radio and either an
802.11g radio or an 802.11b radio, cable the antennas for the 802.11g
or 802.11b at least 3.05 m (10 ft) from the access point.
ˆ If your access point has an 802.11a mid-range radio and either an
802.11g radio or an 802.11b radio, cable the antennas for one of the
radios at least 3.05 m (10 ft) from the access point.
Table 1. Recommended Antenna Separation for Antenna Diversity
Location Recommended Antenna Separation
Highly reflective
warehouse environment 0.33 m (13 in) or 0.64 m (25 in)
Moderately reflective
warehouse environment 0.64 m (25 in), 1.22 m (4 ft), or 1.83 m (6
ft)
Open/Office environment 1.22 m (4 ft) to 3.05 m (10 ft)