Alcatel OmniAccess Wireless System 2.1 Product Manual page 88

for instance, for outside-wall mounting locations where coverage is only desired inside the building, and
in a back-to-back arrangement that can allow twice as many clients in a given area.
The following sections contain more information about OmniAccess AP 1200 or 1250 internal and
external antennas:
•
External Antenna Connectors
•
Antenna Sectorization
•
802.11a Internal Antenna Patterns
•
802.11b/g Internal Antenna Patterns
External Antenna Connectors
The OAW-1200BGE, OAW-1200ABGE and OAW-1200ABGR OmniAccess AP Access Points and Alcatel
OmniAccess Remote Edge Access Points have male reverse-polarity TNC jacks for installations requiring
factory-supplied external directional or high-gain antennas. The external antenna option can create
more flexibility in OmniAccess AP 1200 or 1250 and OmniAccess AP 1200R or 1250R antenna
placement.
Note:
designed to be used exclusively with the internal high-gain antennas, and have no
jacks for external antennas.
Note that the 802.11b/g 2.4 GHz Left external antenna connector is associated with the internal Side A
antenna, and that the 2.4 GHz Right external antenna connector is associated with the internal Side B
antenna. When you have 802.11b/g diversity enabled, the Left external or Side A internal antennas are
diverse from the Right external or Side B internal antennas.
Also note that the 802.11a 5 GHz Left external antenna connector is separate from the internal
antennas, and adds diversity to the 802.11a transmit and receive path. Note that no external 802.11a
antennas are certified in FCC-regulated areas, but external 802.11a antennas may be certified for use
in other regulatory domains.
Antenna Sectorization
Note that the Alcatel OmniAccess Wireless System supports Antenna Sectorization, which can be used
to increase the number of clients and/or client throughput in a given air space. Installers can mount
two OmniAccess AP Access Points and/or OmniAccess 1200R APs back-to-back, and the Alcatel Omni-
Access Wireless System operator can disable the second antenna in both OmniAccess AP Access Points
or OmniAccess 1200R APs to create a 360-degree coverage area with two sectors.
Installers can also mount OmniAccess AP Access Points and/or OmniAccess 1200R APs on the periphery
of a building and disable the Side B internal antennas. This configuration can be used to supply service
to the building interior without extending coverage to the parking lot, at the cost of eliminating the
internal antenna diversity function.
802.11a Internal Antenna Patterns
The OAW-1200ABG, OAW-1200ABGE and OAW-1200ABGR OmniAccess AP Access Points and Alcatel
OmniAccess Remote Edge Access Points contain one 802.11a radio, which drives two fully-enclosed
high-gain antennas that provide a large 360-degree coverage area. The two internal antennas are used
at the same time to provide a 360-degree omnidirectional coverage area, or either antenna can be
disabled to provide a 180-degree sectorized coverage area.
When equipped with an optional factory-supplied external antenna, the OAW-1200ABG,
OAW-1200ABGE and OAW-1200ABGR 802.11a OmniAccess Radio supports receive and transmit
diversity between the internal antennas and the external antenna. The diversity function provided by
OmniAccess Radios can result in lower multipath fading, fewer packet retransmissions, and higher
client throughput.
11/5/04 OmniAccess AP 1200 or 1250 External and Internal Antennas
90-100831-300 Rev 2Alcatel OmniAccess Wireless Access Point Quick Installation Guide 47
External Antenna Connectors
The OAW-1200BG, and OAW-1200ABG OmniAccess AP Access Points are
Antenna Sectorization
802.11a Internal Antenna Patterns