Cambium Networks PTP 650 Series, Руководство пользователя

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Chapter 3: System planning Radio spectrum planning
Table 29 PTP 650 wireless specifications (per frequency band)
Item 4.9 GHz 5.4 GHz 5.8 GHz
RF band (GHz) 4.900 -4.990 5.470 -5.725 5.725 -5.875
Channel bandwidth 10, 20 MHz 10, 20, 40, 45 MHz 10, 20, 40, 45 MHz
Typical receiver noise 6 dB 6 dB 6 dB
Typical antenna gain (integrated) 23 dBi 23 dBi 23 dBi
Antenna beamwidth (integrated) 8° 8° 8°
Regulatory limits
Many countries impose EIRP limits (Allowed EIRP) on products operating in the bands used by the
PTP 650 Series. For example, in the 5.4 GHz and 5.8 GHz bands, these limits are calculated as
follows:
•
In the 5.4 GHz band (5470 MHz to 5725 MHz), the EIRP must not exceed the lesser of 30 dBm or
(17 + 10 x Log Channel width in MHz) dBm.
• In the 5.8 GHz band (5725 MHz to 5875 MHz), the EIRP must not exceed the lesser of 36 dBm or
(23 + 10 x Log Channel width in MHz) dBm.
Some countries (for example the USA) impose conducted power limits on products operating in
the 5.8 GHz band.
Conforming to the limits
Ensure the link is configured to conform to local regulatory requirements by installing license keys
for the correct country. In the following situations, the license key does not prevent operation
outside the regulations:
•
When using connectorized ODUs with external antennas, the regulations may require the
maximum transmit power to be reduced.
• When installing 5.4 GHz links in the USA, it may be necessary to avoid frequencies used by
Terminal Doppler Weather Radar (TDWR) systems. For more information, refer to
Avoidance of
weather radars (USA only) on page 3-20 .
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