# How can I calculate maximum power settings for connectorized ePMP 1000 / ePMP 2000 - all bands?

If a connectorized ePMP link is to be installed in a country that imposes an EIRP limit in the selected band, choose an external antenna and RF cable that will not cause the ePMP 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: Is: Maximum Power Level (dBm) the highest permissible setting of the Maximum Power Level attribute Allowed EIRP (dBm) the EIRP limit allowed by the regulations, Antenna Gain (dBi) the gain of the chosen antenna, Cable Loss (dB) the loss of the RF cable connecting the AP to the antenna.

As the 2.4 GHz, 5.4 GHz and 5.8 GHz have an operating bandwidth of 5 MHz, 10 MHz, 20 MHz or 40 MHz then the maximum allowed EIRP depends on the operating bandwidth of the radio as shown in the table below:

Normal EIRP limits with operating channel bandwidth

 Operating bandwidth (MHz) Allowed EIRP (dBm) at 5.2 GHz Allowed EIRP (dBm) at 5.4 GHz Allowed EIRP (dBm) at 5.8 GHz Allowed EIRP (dBm) at 2.4 GHz 5, 10, 20, 40 24 - 30 24 - 30 36 36

The settings to be used for regions with the EIRP limits iare shown below:

Setting maximum transmit power to meet general EIRP limits

 Antenna Maximum available antenna gain (dBi) Operating bandwidth (MHz) Transmitter Output Power parameter setting (dBm) 2.4 GHz 2.5 GHz 5.2 GHz 5.4 GHz 5.8 GHz ePMP 2000 Conn. module Sector antenna 18 5, 10, 20, 40 N/A N/A 12 12 18 ePMP 1000 Conn. module Sector antenna 15 5, 10, 20, 40 21 27 15 15 21
 Note Calculations are on the basis of 0.5 dB cable loss and the highest gain antennas per size of which Cambium Networks are aware. At these operating frequencies, antenna cable losses even with short cables are unlikely to ever be below 0.5 dB for practical installations and cable diameters.