The AP should be installed in a similar orientation as in a ceiling installation. However, it is left to
a qualified installer to determine how to install and secure the AP in a plenum in an appropriate
and safe manner. Plenum-rated cables and attachment hardware must be used.
Country of use
CAUTION: In some regions, you are prompted to select the country of use during setup. Once
the country has been set, the AP will automatically limit the available wireless channels, ensuring
compliant operation in the selected country. Entering the incorrect country may result in illegal
operation and may cause harmful interference to other systems.
External antennas
CAUTION: When using an external antenna, depending on the country of use, the antenna
selected, and your radio settings, it may be mandatory to reduce the radio transmission power
level to maintain regulatory compliance. For specific power limits for your country, consult the
Antenna Power-Level Setting Guide (for MSM Products) available from www.hp.com/support/
manuals. Search by antenna product name or number.
To set the radio power transmission level for controlled access points see Transmit power control
in the MSM7xx Controllers Configuration Guide. For autonomous access points, see Transmit
power control in the MSM3xx / MSM4xx APs Configuration Guide.
Power supply
The MSM422 is intended to have its power supplied by a Listed Information Technology Equipment
AC Adapter, Wall Industries Inc., Model GPSU30A-8, rated output 33-50 Vdc, 0.91-0.61 A,
available as HP part number J9406A. As an alternative, the MSM422 may be connected to an
external PoE source.
Safety
Take note of the following safety information during installation.
• If your network covers an area served by more than one power distribution system, be sure
all safety grounds are securely interconnected.
• Network cables may occasionally be subject to hazardous transient voltages (caused by
lightning or disturbances in the electrical power grid).
• Handle exposed metal components of the network with caution.
• The AP is powered-on when the Ethernet port is plugged into a PoE power source or when an
external power supply is connected.
• The AP and all interconnected equipment must be installed indoors within the same building
(except for outdoor antennas), including all PoE-powered network connections as described
by Environment A of the IEEE 802.3af standard.
Important information to read before installing 9
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