User's Manual Part 5

SYSTEM SETUP ROI-S05749
3-26
A constant transmit output power in both MTPC and ATPC is maintained
using the ALC function which is provided in the RF CKT module. The
ALC circuit detect the transmit output power using a diode to obtain a DC
voltage proportional to the transmit power. The gain of the RF amplifier is
controlled inversely with this detected DC voltage to maintain the transmit
output power within the specified limits.
When the ATPC malfunction occurs, transmitter output power is
maintained at the following level according to the ATPC mode. The ATPC
mode is set in provisioning using LCT.
Hold:Maintain the TX output level at the current level, when the
ATPC malfunction occurs.
MAX:Maintain the TX output level at ATPC maximum level, when
the ATPC malfunction occurs.
MIN:Maintain the TX output level at ATPC minimum level, when
the ATPC malfunction occurs.
(ATPC)
SUBSTATION 2
(ATPC)
SUBSTATION 3
(ATPC)
SUBSTATION 4
MASTER
STATION
(ATPC)
SUBSTATION 1
(ATPC)
SUBSTATION 5
(A)
(B)
(A),(B)
(C)
: Diffraction to other route.
: RX received level down.
(C)
(MTPC)