2-2 Q-Series
®
Power – BAQ-UP™ (QRED) Redundancy Switch with Backup Amplifier – Installation & Operation Manual
This wiring configuration is for a hub site with a primary
input and a backup input. In addition to the wiring
method, the microprocessor is programmed at ATX to
switch to the secondary input when the primary input falls
below the threshhold level. When the primary level is
restored within normal range, the QRED will switch back
to the primary input immediately. This is an advantage in
unmanned hub sites in that no level resetting is required
after a primary path failure.
This wiring configuration is for a headend site with an amplifier that needs
backup protection. This typically is used in the signal path where an amplifier
failure is not acceptable. The QRED switch is programmed to switch to the
secondary amplifier when the cumulative RF output of the primary amplifier falls
below a programmed level, usually a 3 dB drop. This output is measured within
a frequency range from 120-220 MHz. The microprocessor controlled switch
can be programmed to switch within the end users specifications for timing and
RF levels. Once a switch is made to the secondary amplifier, the signal path
continues through the secondary amplifier until a technician restores the
primary amplifier signal levels and resets the switch manually.
SECONDARY (BACKUP) RECEIVER
PRIMARY (MAIN) RECEIVER
OUT
TO
PRIMARY
IN
FROM
PRIMARY
INPUT
DETECTOR
OUTPUT
SIGNAL OUT
DETECTOR
IN
FROM
SECONDARY
OUT
TO
SECONDARY
JUMPER
NC
NO
C
NC
NC
NC
NO
NO
NO
C
C
C
SIGNAL IN
PRIMARY (MAIN) AMP
OUT
TO
PRIMARY
IN
FROM
PRIMARY
INPUT
DETECTOR
OUTPUT
SIGNAL OUT
DETECTOR
IN
FROM
SECONDARY
OUT
TO
SECONDARY
SECONDARY (BACKUP) AMP
NC
NO
C
NC
NC
NC
NO
NO
NO
C
C
C
2.1 Functional Schematic
CHAPTER 2: DESCRIPTION OF OPERATION
