Verint Nextiva S1100w User Manual - Antenna Requirements
Verint Video Solutions
15
Nextiva S1100w User Guide
For distances under seven miles, the earth curvature effect is negligible. However, for
greater distances, you need to consider it in your calculations; for instance, for a 15-mile
link in the 2.4 GHz band, the two antennas must be located 82 feet higher than the highest
obstacle in the RF line of sight between them (that is, 53 feet for the Fresnel zone plus
29 feet for the earth curvature effect). For help, consult the Verint Video Solutions project
engineering group.
A common problem encountered in the field and related to the 0.6 F1 clearance rule is
building obstruction. The proposed visual path may just barely clear a building but the RF
line of sight will not. In such a case, the signal will be partially absorbed and diffracted.
Increasing the height of the two antennas or the gain of the antennas are the only
alternatives to improve the link quality.
Note: At 2.4 and 5 GHz, radio waves are highly attenuated by dense foliage. A link
established in the fall or winter season may be adversely affected in the spring and
summertime, if it is established below tree level.
Antenna Requirements
Verint Video Solutions offers many antennas to meet various distance requirements.
You need to consider many factors when choosing an antenna, including the distance to
cover, the RF bit rate, the radiated power (EIRP), and the frequency band. For systems
located in North America on the 5 GHz band, you can use the Wireless Distance Calculator
located on the Verint Video Solutions extranet (Technical Support, then Downloads, then
Tools).
The combined transmission power of the device and antenna must not exceed the
maximum value established by your country’s regulations. To ensure that this maximum is
not exceeded, enter the gain of the chosen antenna in the CLI (Wireless Communication
menu) or SConfigurator (Wireless pane). The device will automatically take it into account
and adjust its own transmission power accordingly at startup.
To know the maximum antenna gain you can use, subtract a value from the maximum EIRP
allowed (in dBm):
The maximum EIRP varies depending on your country and band; for more information,
refer to the Wireless Frequency Plan document located on the Verint Video Solutions
extranet (Technical Support, then Downloads, then Tools). In North America for instance:
Frequency band
Value to subtract from EIRP
2.4 GHz in North America
11 dB
2.4 GHz in Europe
11 dB
5 GHz with DFS/TPC
12 dB
5 GHz without DFS/TPC
6 dB
Frequency band
Maximum transmitted
power of the device
Maximum radiated power (EIRP)
2.4 GHz
18 dBm
30 dBm
5.3 GHz
17 dBm
30 dBm
5.8 GHz
17 dBm
36 dBm in point to multipoint
53 dBm in point to point