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RJ-45 Cable Ports
The access point has two RJ-45 ports. Each port provides a 10/100BASE-TX Ethernet connection to a WX
switch. The connection can be direct to an WX switch or indirect through an intermediate Layer 2 or
Layer 3 network.
The access point receives power and data through the RJ-45 ports. Use a Category 5 (Cat 5) cable with
straight-through signaling and standard RJ-45 connectors to connect an access point to a WX switch or
other device in the network. The access point supports 802.3af, and also can receive PoE from 3Com
switches and 3Com-approved power injectors.
The two RJ-45 ports support dual-homed configurations for redundancy. The access point uses only one
link for booting, configuration, and data transfer. If the link becomes unavailable, the access point can
reboot using the other link.
The ports are identical except for logical numbering (1 or 2). You can use either port to connect the
access point to a WX switch. However, the access point always attempts to boot on port 1 first. Only if
the boot attempt on port 1 fails does the access point attempt to boot on port 2. If one port becomes
unavailable, the other port can provide full power to the access point.
External Antenna Connectors
The access point has connectors for attaching optional external antennas. See “Connecting External
Antennas” on page 5 for more information.
Observing Safety Precautions
This equipment must be installed in compliance with local and national building codes, regulatory
restrictions, and FCC rules. For the safety of people and equipment, only professional network personnel
should install the access point
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Note: The access point does not support daisy-chain configurations. Do not connect the access point
to another AP3750 access point.
WARNING: To comply with FCC radio frequency (RF) exposure limits, a minimum body-to-
antenna distance of 20 cm (8 inches) must be maintained when the access point is operational.
WARNING: To avoid possible injury or damage to equipment, you must use power supply equipment
that is safety certified according to UL, CSA, IEC, or other applicable national or international safety
requirements for the country of use. All references to power supply in this document refer to equipment
meeting these requirements.
WARNING: Do not operate the access point near unshielded blasting caps or in an otherwise
explosive environment unless the device has been modified for such use by qualified personnel.
WARNING: Do not touch or move the access point when the antennas are transmitting or receiving.
WARNING: Do not hold any radio device so that the antenna is very close to or touching the face,
eyes, or other exposed body part while the device’s radio antenna is transmitting.
10015414-AA_AP3750_QSG.fm Page 3 Tuesday, July 25, 2006 1:59 PM