User's Manual Part 5

SYSTEM SETUP ROI-S05749

3-24

Fig. 3-4 ATPC, Functional BLock Diagram

Example of ATPC setting.

Where ATPC MAXIMUM PWR of ATPC Range is set to 0 dB, ATPC

MINIMUM PWR is set to -10 dB and RX Threshold to -55 dBm. In this

case, if RX level is lower than -55 dBm, monitor/control is performed with

the interval of 8 msec. RX level is monitored in 1 dB step, and TX output

is controlled in 1 dB step.

However, a fixed hysteresis of 5 dB referred to the RX Threshold is

implemented for ATPC operation.

Example: If RX Threshold is set to -55 dBm, no output control is made

unless the RX level goes below -55 dBm or goes above -50 dBm, so that

the receive level is maintained within -55 to -50 dBm by ATPC.

POWER CONT

REMOTE

RX IN LEV

REMOTE

CTRL

ATPC CTRL

TRANSMITTING STATION RECEIVING STATION

MODEM

-50 dBm

RX LEVEL

-55 dBm

(RX THRESHOLD

LEVEL)

5 dB

(ATPC

HYSTERESIS)