ADC RF Worx RDS-2, Руководство пользователя

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ADCP-61-819
•
Issue 1
•
July 2000
Page 2
© 2000, ADC Telecommunications, Inc.
1.1 Graphic User Interface – S
WATCH
TM Switch Monitoring Software
The S
WATCH
TM
GUI software for the Redundant Amplifier Switch provides continuous remote
monitoring of the switch and associated systems. It is designed for Windows
TM
95/98/NT/2000systems with a 133 MHz (or faster) Pentium
TM
processor. See Section 4.
2 DESCRIPTION
This section provides functional, physical, and technical descriptions of the RDS-2 Redundant
Amplifier Switch.
2.1 Functional Description
Figure 2 is block diagram for the redundant amplifier switch. Both the RF input and output
signals are applied to a coupler that routes a small portion of the signal through an analog level
detection circuit and an analog-to-digital converter to the logic and control circuits. Other inputs
to the logic and control circuits include the SWITCHING THRESHOLD, GAIN TRIP LEVEL
(2 to 7 dB down from the amplifier reference level), Primary AMP SELECT, and the
NORMAL/CALIBRATE controls in the S
WATCH
TM
software (see Section 4). When triggered by
a Primary amplifier gain failure, the logic and control circuits switch on input power to the
Backup amplifier, then, after a short delay, the RF In and RF Out signals are also switched over
to the Backup amplifier (total elapsed time equals approximately 50 msec). After successfully
switching to the Backup amplifier, input power to the Primary amplifier is turned off.
RF OUTPUT RF INPUT RF
RDS-2 A A
B B
RF
A INPUT
POWER
POWER
PORT 1 PORT 2
MICROPROCESSOR
CONTROL
PRIMARY
AMP
COMPUTER
MONITOR &
ALARM
SYSTEM
B INPUT
A OUTPUT
B OUTPUT
STANDBY
AMP
10141-A
Figure 2. Redundant Amplifier Block Diagram
Note:
Single or dual failure status will cause an alarm condition and close the alarm contacts.
Future revisions of the S
WATCH
TM
software will provide increased programmability of alarm
conditions.
Note: Loss of signal status, defined as a loss of input RF signal to the RDS-2, does not
cause an alarm contact closure since the failure is in the network upstream of the RDS-2.
However, the loss of signal condition is indicated on the front panel of the Redundant
Amplifier Switch and through the S
WATCH
TM monitoring software.