Calculating Maximum Power Level For Connectorized Units; Table 2-6 Setting Maximum Power Level To Meet Eirp Limits - Motorola PTP 250 User Manual

PTP 250 User Guide

Calculating maximum power level for connectorized units

If a connectorized PTP 250 link is to be installed in a country that imposes an EIRP limit in
the 5.4 GHz or 5.8 GHz band, choose an external antenna and RF cable that will not cause
the PTP 250 to exceed the EIRP limit. To calculate the highest setting of Maximum Power
Level that will be permitted, use this formula:
Maximum Power Level (dBm) =
Allowed EIRP (dBm) – Antenna Gain (dBi) + Cable Loss (dB)
Where:
As PTP 250 does not support Maximum Power Level settings below 4 dBm, the maximum
antenna gain (allowing for cable loss) is limited as shown in
formula:
Maximum Antenna Gain (dBi) – Cable Loss (dB) = Allowed EIRP (dBm) – 4

Table 2-6 Setting maximum power level to meet EIRP limits

Band
5.4 GHz
5.8 GHz
Specify Antenna Gain and Cable Loss in the installation report. They must be entered
correctly in the Wireless Wizard, as they are used by the software to impose an automatic
constaint on Maximum Power Level. For more information, see
configuration
phn-2182_003v004 (Oct 2011)
Maximum Power
Level (dBm)
Allowed EIRP
(dBm)
Antenna Gain
(dBi)
Cable Loss (dB)
Regulation Allowed
EIRP
FCC, 30 dBm
Canada and
ETSI
ETSI 36 dBm
on page 6-16.
Is:
the highest permissible setting of the
Maximum Power Level attribute in the
Step 2: Wireless Configuration page,
the EIRP limit allowed by the regulations,
the gain of the chosen antenna,
the loss of the RF cable connecting the
ODU to the antenna.
Maximum (Antenna
Gain - Cable Loss)
26 dBi
32 dBi
UNDER DEVELOPMENT
Planning for connectorized units
Table 2-6, based on this
Maximum Power
Level
4 dBm
4 dBm
Step 2: Wireless
2-13