Aerohive BR200-WP, Справочник по аппаратуре

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Hardware Reference Guide 53
P
RODUCT
O
VERVIEW
Antennas
The AP340 can accept up to six detachable dipole antennas. The three shorter antennas are designed for
the 5 GHz band and have a 2-dBi gain. The three longer antennas are designed for the 2.4 GHz band and
have a 4.9-dBi gain. These antennas are omnidirectional, providing fairly equal coverage in all directions in a
toroidal (donut-shaped) pattern around each antenna. For greater coverage on a horizontal plane, it is
best to orient the antennas vertically. So that you can easily do that whether the AP chassis is mounted
horizontally or vertically, the antennas hinge and swivel (see Figure 2 .)
Although hive members automatically adjust their signal strength according to their environments, you can
resize the area of coverage by increasing or decreasing the signal strength manually by entering the
interface { wifi0 | wifi1 } radio power <number>
command, where
<number>
can be from 1 to
20 and represents a value in dBm.
Figure 2 AP340 antennas
Connect the longer antennas, which support 2.4 GHz frequencies (for IEEE 802.11b/g/n), to the connectors
on the side panel with the Ethernet ports. Connect the shorter antennas, which support 5 GHz frequencies
(for IEEE 802.11a/n), to the connectors on the side panel with the device lock slot.
For detailed information about how to configure external antennas on AP340 devices and other Aerohive
devices that support them, see
"Configuring Antennas" on page 115 .
MIMO
MIMO (Multiple In, Multiple Out) is a major WLAN advancement introduced in the IEEE 802.11n standard in
which multiple RF links are formed on the same channel between the transmitter and receiver
simultaneously. For detailed information about MIMO, see "MIMO" on page 116 .
Figure 3 on page 54 shows the relationship between the antennas and the internal radios on the AP340.
5 GHz Antenna for IEEE
802.11a/n
Length when fully
extended: 5 15/16” (15
cm)
2.4 GHz Antenna for IEEE
802.11b/g/n
Length when fully
extended: 7 7/8” (20 cm)
Generally, orient the antennas vertically
for improved radio coverage, as shown.
When mounting the AP340 on a
ceiling, orient the antennas
downward.
When mounting the device on
a wall or post, fully extend
the antennas upward and
downward.
When mounting the device
above a ceiling or on a
horizontal beam, orient the
antennas upward.
The base of the antennas hinge up to 90 degrees so that you
can orient them independently of the position of the HiveAP
chassis. The antennas also rotate in a full circle.