ADCP-61-810 • Issue 4 • September 2004
Page 4
© 2004, ADC Telecommunications, Inc.
A typical application would be to protect two optical-to-RF receivers. In this setup, the RDS can
independently protect one or two
pairs
of receivers or amplifiers. If there are two pairs,
individual thresholds can be established for each pair, and once the RDS detects a signal level
falling below threshold, it will switch from A to B (or B to A) for that particular pair. Any such
switch from A to B (or B to A) on either port will cause the RDS to close the alarm relay
contacts. All status conditions for each pair of receivers are available locally and remotely via
the SWatch switch monitoring software.
The output power levels of the monitored receivers must fall within the input power ranges for
the RDS specified in
.
Figure 3. Block Diagram for Dual A/B Switch Mode Operation
2.1.3
Dual Alarm Monitor Mode
This mode (shown in
) can be used to monitor RF signals anywhere in the forward path
of the network—such as the output of a critical amplifier or receiver.
Figure 4. Block Diagram for Dual Alarm Monitor Operation
REDUNDANT
FIBER OPTIC
TRANSPORT
SYSTEM
RF
OUTPUT
#1
RF
OUTPUT
#2
RF
RDS-2
A
A
B
B
RF
PRIMARY
TRANSCEIVER/
AMP
PRIMARY
TRANSCEIVER/
AMP
PORT 1
PORT 2
MICROPROCESSOR
CONTROL
COMPUTER
MONITOR &
ALARM
SYSTEM
STANDBY
TRANSCEIVER/
AMP
STANDBY
TRANSCEIVER/
AMP
10137-B
AMP 1
OUTPUT
AMP 2
OUTPUT
RF
RDS-1
A
A
B
B
RF
AMP 1
PORT 1
PORT 2
MICROPROCESSOR
CONTROL
AMP 2
COMPUTER
MONITOR &
ALARM
SYSTEM
10140-A
