Single Or Dual Radio Operation; External Antennas - Cisco Aironet 1520 Series Manual

Connectors
The optional featues of the access point support these connectors (see Figure 1):
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Single or Dual Radio Operation

The access point is available in two models: LAP1522 (supports 2.4-GHz and 5-GHz radios) and
LAP1521 (supports a 2.4- or 5-GHz radio). The radios use external antennas (see "External Antennas").
The LAP1522 model supports simultaneous dual-radio operation using a 2.4-GHz 802.11b/g radio and
a 5-GHz 802.11a radio. The LAP1521 model supports both mesh backhaul operation and wireless
clients using a single 2.4- or 5-GHz radio.
The 5-GHz radio incorporates an Unlicensed National Information Infrastructure (UNII) radio
transceiver operating in the UNII 5-GHz frequency bands. The 5-GHz radio on the access point is used
for backhaul operations to the controller. The 5-GHz radio can also operate in the 4.9-GHz Public
Safety band in the United States.
Note The 4.9-GHz band requires a license and may be used only by qualified Public Safety operators
as defined in section 90.20 of the FCC rules.
The 2.4-GHz radio supports three antennas for multi-input, single output (MISO) operation. The radio
uses three receivers to support maximum ratio combining (MRC) to enhance receiver performance.
MRC is a technique that combines the signals from multiple receivers in a manner to optimize the
signals. MRC can provide up to 3 dB of increased receive signal strength.
The access point does not support both radios configured for backhaul support

External Antennas

The access point is equipped with three N-type radio frequency (RF) connector on the top of the unit
for external 2.4-GHz antennas to support multiple input single output (MISO) operation. The LAP1522
model also has one to three N-type RF connectors on the bottom of the unit for external 5-GHz antennas
(see Figure 1). When using the optional Cisco compact omnidirectional antennas, the 2.4- and 5-GHz
antennas connect directly to the access point. The Cisco omnidirectional antennas use vertical
polarization.
The access point can also be equipped with specific third-party external antennas (see Table 1 and
Table 2), subject to local regulatory requirements. When you are installing third-party antennas, they
must be installed with all waterproofing steps recommended by the third-party manufacturer.
Note When you mount the access point in an indoor environment, you must also mount the antennas
in an indoor environment.
Warning Only trained and qualified personnel should be allowed to install, replace, or service
this equipment. Statement 1030
Ethernet (PoE) uplink connector—(type RJ45 with TBD for waterproofing)
Ethernet downlink connector—(type RJ45 with TBD for waterproofing)
Three Type N antenna connectors (2.4-GHz radio)
One Type N antenna connector (5-GHz radio)
Fiber-optic connector—Small form factor pluggable (SFP)
Power-over-cable (POC) connector—(TBD)
AC power connector