ADC RF Worx RDS-2 User manual

RDS-2 Redundant Amplifier Switch
RF Worx® Signal Protection
User Manual
ADCP-61-819
Issue 1
July 2000
1080155 Rev A
15026-A

ADCP-61-819 •Issue 1 •July 2000 •Preface
Page ii
COPYRIGHT
2000, ADC Telecommunications, Inc.
All Rights Reserved
Printed in the U.S.A.
REVISION HISTORY
ISSUE DATE REASON FOR CHANGE
Issue 1 07/2000 Original
TRADEMARK INFORMATION
ADC and ADC Telecommunications are registered trademarks of ADC Telecommunications, Inc.
RDS-2 is a trademark of ADC Telecommunications, Inc.
SWATCH is a trademark of ADC Telecommunications, Inc.
RF WORX is a registered trademark of ADC Telecommunications, Inc.
Pentium is a registered trademark of the Intel Corporation.
DISCLAIMER OF LIABILITY
Contents herein are current as of the date of publication. ADC reserves the right to change the contents without prior notice. In no
event shall ADC be liable for any damages resulting from loss of data, loss of use, or loss of profits and ADC further disclaims
any and all liability for indirect, incidental, special, consequential or other similar damages. This disclaimer of liability applies
to all products, publications and services during and after the warranty period.
This publication may be verified at any time by contacting ADC’s Technical Assistance Center at 1-800-366-3891, extension 3475
(in U.S.A. or Canada) or 612-946-3000 (outside U.S.A. and Canada), or by writing to ADC Telecommunications, Inc., Attn:
Technical Assistance Center, Mail Station #71, P.O. Box 1101, Minneapolis, MN 55440-1101, U.S.A.
ADC Telecommunications, Inc.
P.O. Box 1101, Minneapolis, Minnesota 55440-1101
In U.S.A. and Canada: 1-800-366-3891
Outside U.S.A. and Canada: [phone]
Fax: [phone]

ADCP-61-819 •Issue 1 •July 2000 •Preface
Page iii
2000, ADC Telecommunications, Inc.
TABLE OF CONTENTS
Content Page
ABOUT THIS MANUAL ....................................................................... v
ADMONISHMENTS.......................................................................... v
1 GENERAL.......................................................................... 1
1.1 Graphic User Interface – SWATCHTM Switch Monitoring Software ............................... 2
2 DESCRIPTION....................................................................... 2
2.1 Functional Description ........................................................... 2
2.2 Physical Description ............................................................ 3
2.3 Technical Description............................................................ 5
3 INSTALLATION ...................................................................... 6
3.1 Redundant Amplifier Switch Installation ............................................... 6
3.2 Connecting the Redundant Amplifier Switch to a Computer .................................. 8
3.3 Alarm Wiring ................................................................. 8
3.4 220 too 240 VAC Operation ........................................................ 9
3.5 RF and Power Cables ............................................................ 10
3.6 The Setup Button ............................................................... 10
4 OPERATION (SWATCHTM GRAPHIC USER INTERFACE) ............................................ 11
4.1 System Requirements ........................................................... 11
4.2 Installation ................................................................... 11
4.3 Graphic User Interface (GUI) Overview ................................................ 12
4.4 Configuring the Program.......................................................... 14
4.5 Program Operation.............................................................. 29
4.6 System Monitoring.............................................................. 34
4.7 SWATCHTM Glossary ............................................................. 36
5 MAINTENANCE ...................................................................... 38
5.1 Preventive Maintenance .......................................................... 38
5.2 Fuse Replacement .............................................................. 38
6 CUSTOMER INFORMATION AND ASSISTANCE ................................................. 39

ADCP-61-819 •Issue 1 •July 2000 •Preface
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2000, ADC Telecommunications, Inc.

ADCP-61-819 •Issue 1 •July 2000 •Preface
Page v
2000, ADC Telecommunications, Inc.
ABOUT THIS MANUAL
This manual provides installation, operation, and maintenance instructions for the ADC RF
Worx RDS-2 Redundant Amplifier Switch. It also includes instructions for the SWATCH™
switch monitoring software.
ADMONISHMENTS
Important safety admonishments are used throughout this manual to warn of possible hazards
to persons or equipment. An admonishment identifies a possible hazard and then explains
what may happen if the hazard is not avoided. The admonishments —in the form of Dangers,
Warnings, and Cautions —must be followed at all times. These warnings are flagged by use
of the triangular alert icon (seen below), and are listed in descending order of severity of
injury or damage and likelihood of occurrence.
Danger: Danger is used to indicate the presence of a hazard that will cause severe personal
injury, death, or substantial property damage if the hazard is not avoided.
Warning: Warning is used to indicate the presence of a hazard that can cause severe
personal injury, death, or substantial property damage if the hazard is not avoided.
Caution: Caution is used to indicate the presence of a hazard that will or can cause minor
personal injury or property damage if the hazard is not avoided.

ADCP-61-819 •Issue 1 •July 2000
Page 1
© 2000, ADC Telecommunications, Inc.
RDS-2 REDUNDANT AMPLIFIER SWITCH –
RF WORX SIGNAL PROTECTION USER MANUAL
1 GENERAL
The ADC RF Worx Redundant Amplifier Switch (Figure 1), a member of the RF WorxTM
family of products, monitors the RF signal gain of an operating (primary) amplifier and
switches to a backup (standby) amplifier if the gain of the primary amplifier falls below a set
point. When an amplifier gain failure occurs, the unit rapidly switches the input power and
then the input and output RF connections from the failed primary amplifier to its backup
amplifier. A STATUS LED is located on the front panel of the switch. An RS-485 interface
provides amplifier calibration data (i.e., date and time) and operating/failure status to a
Windows 95/98/NT/2000 personal computer (PC) equipped with SWATCHTM switch
monitoring software and appropriate interface cards. If the RF input to the primary amplifier
falls below a detectable level, the switch sends a Loss of Signal (LOS) alarm to the PC but
does not switch amplifiers.
The Redundant Amplifier Switch is designed for use in 19-inch or 23-inch equipment racks.
All RF signal connections to the switch are made through standard 75-ohm BNC connectors
(RDS2-RA-B) or F connectors (RDS2-RA-F) on the rear panel.
The RF bandwidth used with this equipment is that of the CATV forward path video (i.e., 50
to 1000 MHz).
15026-A
Figure 1. Redundant Amplifier Switch (RDS-2)

ADCP-61-819 •Issue 1 •July 2000
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© 2000, ADC Telecommunications, Inc.
1.1 Graphic User Interface – SWATCHTM Switch Monitoring Software
The SWATCHTM GUI software for the Redundant Amplifier Switch provides continuous remote
monitoring of the switch and associated systems. It is designed for WindowsTM
95/98/NT/2000systems with a 133 MHz (or faster) PentiumTM 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 SWATCHTM 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 OUTPUTRF INPUT RF
RDS-2AA
BB
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 SWATCHTM 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 SWATCHTM monitoring software.

ADCP-61-819 •Issue 1 •July 2000
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© 2000, ADC Telecommunications, Inc.
2.1.1.1 Assured Best Failure
When the Redundant Amplifier Switch goes into a dual failure state, the assured best failure
algorithm of the microprocessor will momentarily compare the gain of the A & B side amplifiers. It
will then choose the amplifier with the strongest gain and “lock” onto it until the dual failure status
condition is cleared. This assures that the Redundant Amplifier Switch uses the best possible
amplifier during a dual failure condition – to minimize service degradation/interruption.
2.2 Physical Description
Figure 3shows the front panel of the Redundant Amplifier Switch. The parts are identified by
letter and include a brief description.
ABCDEF
15027-A
Figure 3. Front Panel of the Redundant Amplifier Switch
LETTER NAME DESCRIPTION
AAmplifier Input Status LEDs
(Green)
When lit, shows the active amplifier
BAmplifier Output Status LEDs
(Green)
When lit, shows the active amplifier
CLoss of Signal (LOS) LED
(Red)
When lit, indicates a loss of input signal
to the unit.
DNon Functioning LED N/A
EAmp Failure LED (Red) When lit, indicates a failure in amplifier A
FAmp Failure LED (Red) When lit, indicates a failure in amplifier B

ADCP-61-819 •Issue 1 •July 2000
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© 2000, ADC Telecommunications, Inc.
Figure 4 shows the rear panel of the Redundant Amplifier Switch. The parts are identified by
letter and include a brief description.
BCDEFGH
A
15028-A
Figure 4. Rear Panel of the Redundant Amplifier Switch
LETTER NAME DESCRIPTION
AFrame Ground Screw Grounds the unit to the equipment rack/frame
BSetup Button Calibrates the unit
CBNC/F-Type Connectors Connects the unit to network equipment
DRS-485 Receptacles Input and output for personal computer (with SWATCHTM
switch monitoring software) interface cables
ETerminal Block Alarm and –48V battery power DC power connections
F24V VDC Power Provides 24V VDC power in for power supplies 1 and 2
(left) and 24V switched power out for Amps A and B (right)
GAC Power Out Receptacles 120 VAC outputs for powering external equipment
HAC Power Input Receptacle Connects the unit to 120 VAC power supply

ADCP-61-819 •Issue 1 •July 2000
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© 2000, ADC Telecommunications, Inc.
2.3 Technical Description
Table 3. Redundant Amplifier Switch Specifications
PARAMETER SPECIFICATION REMARKS
Physical
Panel Dimensions
(H ×W ×D)
1.75 ×19 ×12 inches
(4.45 ×48.26 ×30.48 cm)
Cable tie bar extends 4"
(10 cm) beyond rear panel
Electrical
Voltage Input 48 Vdc ±20%, or 240/120 Vac,
47 to 63 Hz, or 100 Vac, 50 to 60 Hz
75 mA typical
Power Input <5 watts typical
RF Switch 2 SPDT per panel
Bandwidth 50 - 1,000 MHz
Impedance 75 Ωnominal
Insertion Loss 0.75 dB Typical at 750 MHz
Return Loss 25 dB Typical at 750 MHz
23 dB Typical at 1 GHz
Isolation >55 dB Typical at 750 MHz
Composite Triple Beat (CTB) –67 dBc min. 110 channels
Composite Second Order (CSO) –67 dBc min. 110 channels
Total Power (dBm) –35 dBm to +15 dBm
Calibration Range –26 dBm to +6 dBm
Switching Time
Return Delay
50 milliseconds, maximum
15 seconds (default) Adjustable from 1 second
to 4 minutes
Switch action on power failure Retain position Calibration data retained
for 1 week, minimum
Detection Points All A and B inputs
Minimum Number
of RF Channels
16 Fewer channels may
impact accuracy
Accuracy <1 dB, typical 3 to 7 dB threshold settings
Alarms Front panel LEDs, RS-485
data interface, dry relay contacts
normally open
Environmental
Temperature (Operating) 0°C to + 50°C (+32°F to 122°F)
Temperature (Storage) –40°C to +70°C (–40°F to +158°F)
Humidity (Operating) 10 to 90% No condensation
Humidity (Storage) 5 to 95% No condensation