Cal Amp VIPER SC+ 100 series User Manual - page 30
Viper SC+™ IP Router for Licensed Spectrum PN 001-5008-000 Rev. C
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An option to configure the Viper SC+ for multispeed networking is in the first step of the Viper Setup Wizard or later in
the RF Network tab of the RF Network Settings page. Instructions for completing the Viper Setup Wizard and for
configuration options in the Viper Web Interface tabbed pages are provided later in this User Manual.
Figure 13 – Viper SC+ Base Station with remote Vipers configured with different OTA data rates
2.3. UNDERSTANDING RF PATH REQUIREMENTS
Radio waves are propagated when electrical energy produced by a radio transmitter is converted into magnetic energy
by an antenna. Magnetic waves travel through space. The receiving antenna intercepts a very small amount of this
magnetic energy and converts it back into electrical energy that is amplified by the radio receiver. The indicator of
strength of signal energy received by the receiver is called the Received Signal Strength Indication (RSSI) and is
expressed in dBm.
A radio modem requires minimum amount of received RF signal to operate reliably and provide adequate data
throughput. This is the radio receiver’s sensitivity. In most cases, spectrum regulators will define or limit the amount of
signal that can be transmitted and it will be noted in the FCC license. This is the effective isotropic radiated power
(EIRP). Transmitted power decays with distance and other factors as it moves away from the transmitting antenna.