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3 Connecting External Antennas
The access point has connectors for attaching optional external antennas and antenna cables. The tables
below list the external antenna and cable models that are certified for use with the access point.
The 3Com antennas are dual-band, which means that they operate in both 2.4GHz and 5GHz spectra.
You can use these antennas with either the 802.11b/g radio or the 802.11a radio.
Each antenna requires the purchase of a separate antenna cable.
For installation instructions, see the documentation that is supplied with the antenna.
4 Mounting the Access Point
The access point can be mounted on the following types of surfaces:
• Suspended ceiling — flush ceiling tiles
• Suspended ceiling — drop ceiling tiles
• Junction box
• Solid wall or ceiling
•Tabletop
Antenna Model Typ e Restrictions
3CWE591 3Com 6/8 dBi Dual-Band Omnidirectional Antenna Not supported for IEEE 802.11
a-band channels 36-48 for the
United States, Canada, Mexico,
Peurto Rico, Panama, Guatemala,
Dominican Republic and
Colombia
3CWE597 3Com 6/8 dBi Dual-Band Hallway Antenna
3CWE598 3Com 8/10 dBi Dual-Band Panel Antenna
Cable Model Typ e Length Gain Connectors
a
a.Each 3Com cable includes a separate 50 Ohm SMA terminator.
3CWE580 3Com Ultra-Low-Loss
6-foot Antenna Cable
1.8 m
(6 ft)
2.4 GHz: -0.6 dBl
5.0 GHz: -1.2 dBl
SMA (male) to N-type
(male)
3CWE581 3Com Ultra-Low-Loss
20-foot Antenna Cable
6.1 m
(20
ft)
2.4 GHz: -2.0 dBl
5.0 GHz: -4.0 dBl
SMA (male) to N-type
(male)
3CWE582 3Com Ultra-Low-Loss
50-foot Antenna Cable
15.2 m
(50 ft)
2.4 GHz: -5.0 dBl
5.0 GHz: -10.0 dBl
SMA (male) to N-type
(male)
NOTE: Antenna cables introduce loss of the RF signal. Always use the shortest cable that your
application allows.
NOTE: During the installation, connect the antenna to the access point before connecting the
Category 5 Ethernet cable. This ensures that the access point is not powered on when the
access point is connected to the network.
10015414-AA_AP3750_QSG.fm Page 5 Tuesday, July 25, 2006 1:59 PM