User's Manual

PTP 250 User Guide Wireless specifications
phn-2182_002v000
May 2011
4-19
Wireless specifications
This section contains specifications of the PTP 250 wireless interface. These
specifications include RF bands, channel width and link loss.
General wireless specifications
Table 4-14 contains radio system specifications for the 5.4 GHz band. Table 4-15
contains radio system specifications for the 5.8 GHz band.
Table 4-14 5.4 GHz RF specifications
Radio technology Specification
RF band 5.470-5.725 GHz
Channel selection By dynamic frequency control and manual intervention
Automatic detection on start-up and continual adaptation.
Dynamic frequency control Initially 10-15 sec. Out of service on interference 100 ms.
Channel width 20 MHz and 40 MHz
Manual power control Maximum power can be controlled lower than the power
limits in order to control interference to other users.
Receiver noise figure Typically 6 dB
Integrated antenna type Integrated flat plate antenna; gain 23dBi
External antenna gain See Calculating EIRP for connectorized units on page 4-30.
Antenna beamwidth 8 Degrees
Max path loss 150 dB (20 MHz channel, integrated antenna)
Range (optical line-of-sight) 27 km (17 miles) at channel width 20 MHz
54 km (34 miles) at channel width 40 MHz
Over-the-air encryption Proprietary scrambling mechanism.
Weather sensitivity Sensitivity at higher modes may be reduced during high winds
through trees due to Adaptive Modulation Threshold changes
Error correction FEC