Installation Guide

Prof Install Guide for M900S Access Point and Subscriber Unit
3
4. General Information
4.1 Contents
Each SU or AP radio comes equipped with an intenal dual polarization antenna, a power-over-Ethernet (POE) J-Box, an
AC adapter, and mounting hardware for pole mounting. The radio also has one reverse-polarity SMA connectors on the
side for attachment to an external antenna. The MAC ID and Serial # are printed on a label on the back of the radio.
4.2 Connections
See M900S User Manual for detailed diagram for connecting radio to network or PC utilizing the power over Ethernet
(PoE) J-Box cat-5 cables.
NOTE: DO NOT APPLY DC POWER TO THE M900S-SU or M900S-AP UNTIL THE ANTENNA IS
ATTACHED WHEN USING THE “e” ANTENNA OPTION, OTHERWISE DAMAGE TO THE RADIO MAY
OCCUR.
5. Setting the Maximum RF Power
When installing M900S-AP or M900S-SU there are several FCC certified antennas options available. Due to FCC
restrictions the professional installer must manually set the maximum power when any antenna gain greater than 10 dBi
is used upon which antenna is being used, since the max power of the radio is +26 dBm and the max EIRP allowed is
+36 dBm. The table below shows the maximum power the radio must have to achieve an EIRP of +36 dBm or 4 watts
(FCC limit). Only the antennas listed below are allowed to be used with the radio.
Antenna Model Antenna Gain (incl/cable loss) Radio Max power setting
BS915XL7 (Omni) +8.65 dBi +26 dBm (no change required)
PC9013N (Yagi) +15 dBi +21 dBm
Note that in all cases, Antenna Gain + Radio Max Power Setting = 36. Once set, the powerleveling feature in the SU
will still operate normally, but the maximum EIRP will never exceed 4 watts (+36 dBm).
NOTE: IT IS THE RESPONSIBILITY OF THE INSTALLER TO ENSURE THAT THE FCC
REQUIREMENTS DESCRIBED ABOVE ARE MET.
The telnet command to change the maximum power is:
maxpower <max power in dBm>
The flash memory must be updated after running the command.
The command must be run on the M900S-AP or M900S-SU (via telnet or serial port session) prior to installing the
antenna and while the Opmode is OFF.
Example: To set the max power to 21 dBm for the Cushcraft Yagi Antenna:
#> maxpower 21
#> Updateflash systemsetting