Power-Over-Ethernet (Poe); Antennas - Proxim AP-4000 User Manual

Installation and Initialization
AP-4000/4000M/4900M Hardware Description
Wireless
Ethernet
Interfaces
Figure 2-2 LED Indicators on the Top Panel

Power-over-Ethernet (PoE)

The AP-4000/4000M/4900M is equipped with an 802.3af-compliant Power-over-Ethernet (PoE) module. PoE delivers
both data and power to the access point over a single Ethernet cable. If you choose to use PoE, there is no difference in
operation; the only difference is in the power source.
• The PoE integrated module receives ~48 VDC over a standard Category 5 Ethernet cable.
• To use PoE, you must have a PoE hub (also known as a power injector) connected to the network.
• The cable length between the PoE hub and the Access Point should not exceed 100 meters (approximately 325 feet).
The PoE hub is not a repeater and does not amplify the Ethernet data signal.
• If connected to an PoE hub and an AC power supply simultaneously, the Access Point draws power from PoE.
Also see Hardware Installation.
NOTE: The AP's 802.3af-compliant PoE module is backwards compatible with all ORiNOCO Active Ethernet (PoE) hubs
that do not support the IEEE 802.3af standard.

Antennas

Each radio on the AP-4000/4000M/4900M employs two internal antennas for antenna diversity: one is vertically
polarized, and the other is horizontally polarized to provide optimal spatial and polarization diversity. When the AP is
hung on the wall of an office or building, the horizontally polarized antenna provides coverage for that particular floor
level. The vertically polarized antenna provides spatial diversity for the horizontally polarized antenna in the event of an
antenna null. In addition, the vertically polarized antenna provides some coverage above and below the current floor
level. When the AP is mounted on the ceiling or sitting on a table, the effect is the same, but the roles of the two antennas
switch.
The AP supports both receive and transmit diversity. When receiving, the AP chooses the antenna that receives the
strongest signal. When transmitting, the AP chooses the antenna with the highest success rate, and broadcasts are
transmitted on alternating antennas.
Antenna diversity is enabled by default (set to "auto") per wireless interface. When using the internal antennas, Proxim
recommends leaving antenna diversity enabled. However, you may disable antenna diversity by manually selecting
which antenna to use for each wireless interface through the Command Line Interface.
When operating in 4.9 GHz Public Safety mode, an external 4.9 GHz antenna must be attached to the pigtail connected
to Antenna connector 3 (and the corresponding internal antenna is disabled). See
Install External Antennas (Professional Installation Required)
Power
AP-4000/4000M/4900M User Guide
External Antennas
for installation instructions.
for information and
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