3-17
RF-7800W
SYSTEM ADMINISTRATION AND CONFIGURATION
3.8.3.2 ATPC
ATPC stands for Automatic Transmit Power Control and is useful for reducing co-site interference or dealing with
dynamically changing link conditions. A target RSSI is set on the SC radio, which is used as the goal for all radio
links. If link conditions are degraded and the current transmit power is lower than the maximum configured transmit
power, radios will increase their power in order to meet the target RSSI. When link conditions improve, radios
reduce their power accordingly. All radios will respect the configured maximum transmit power setting. ATPC
supports adjusting the Tx Power for the following System Modes: SPTP SC, SPTP SS, and SPMP SS.
3.8.3.3 External PA
An external Power Amplifier (PA) can be attached to the radio in order to extend range and increase signal coverage.
Entering the nominal transmit gain and receive gain (or loss) of the PA provides the radio awareness of the actual
power level being transmitted and received by the system. This information can be used by various features to
improve performance compared to if the radio was not aware of the presence of the PA.
3.8.3.4 Statistics
The actual transmit power depends on a number of things, including Automatic Transmit Power Control (ATPC)
settings and dynamic link conditions. The current transmit power and other related statistics are logged. Transmit
power statistics are adjusted when using an external PA such that the values shown correspond with the output of
the PA to the antenna.
3.8.4 Frequency
The frequency settings are described below.
3.8.4.1 Configuration
The frequency of operation can be configured at 0.5 MHz intervals anywhere within the radio's operating band. The
configured frequency is limited to half of the configured channel width away from the low and high ends of the
operating band. Depending on DFS or EIM settings, the actual operating frequency might differ from the configured
operating frequency.
3.8.4.2 Auto-Scan
Radios configured as Subscriber Stations have the ability to quickly auto-scan frequency and channel width if a
Sector Controller is not detected within a period of time. This allows SS radios to automatically locate a valid SC
16-QAM 3/4 18 20 20
64-QAM 2/3 18 18 18
64-QAM 5/6 18 18 18
256-QAM 3/4 15 15 15
256-QAM 7/8 15 15 15
Table 3-4. Maximum Transmit Power (Continued)
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