ADC RF Worx is a redundant switch designed to monitor the RF signal gain of an operating (primary) amplifier and switch to a backup (standby) amplifier if the gain of the primary amplifier falls below a set point.
When an amplifier gain failure occurs, the RDS rapidly switches the input power and then the input and output of the failed amplifier to the backup amplifier. It also provides a switch closure to indicate an amplifier failure.
In addition to redundant amplifier mode, the RDS can also be used in A/B switch mode or dual alarm monitor mode.
In A/B switch mode, the RDS can be used to switch between two input signals.
ADC RF Worx is a redundant switch designed to monitor the RF signal gain of an operating (primary) amplifier and switch to a backup (standby) amplifier if the gain of the primary amplifier falls below a set point.
When an amplifier gain failure occurs, the RDS rapidly switches the input power and then the input and output of the failed amplifier to the backup amplifier. It also provides a switch closure to indicate an amplifier failure.
In addition to redundant amplifier mode, the RDS can also be used in A/B switch mode or dual alarm monitor mode.
In A/B switch mode, the RDS can be used to switch between two input signals.
ADCP-61-810
Issue 4
September 2004
1303196 Rev A
RF Worx
®
Redundant Switch (RDS)
User Manual
O
P
E
R
A
T
IN
G
C
A
L
IB
R
A
T
IO
N
N
O
R
M
A
L
S
W
IT
C
H
IN
G
T
H
R
E
S
H
O
L
D
(-R
)
B
A
S
IN
G
L
E
F
A
IL
U
R
E
L
O
S
S
O
F
IN
P
U
T
D
U
A
L
F
A
IL
U
R
E
SELECT
SELECT
STATUS
9134-B
2A 240V
V: 38.4–57.6 VDC/100/120/240 VAC
Ø: 1
A: 1A MAX DC / 2A MAX AC
HZ: 47–63 HZ
U
R
P
ATEN
T PEND
ING
ADCP-61-810 • Issue 4 • September 2004 • Preface
Page ii
COPYRIGHT
© 2004, ADC Telecommunications, Inc.
All Rights Reserved
Printed in the U.S.A.
REVISION HISTORY
TRADEMARK INFORMATION
RF Worx is a registered trademark of ADC Telecommunications, Inc.
ADC and ADC Telecommunications are trademarks of ADC Telecommunications, Inc.
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 73475
(in U.S.A. or Canada) or 952-917-3475 (outside U.S.A. and Canada), or by e-mail to connectivity_tac@adc.com.
ISSUE DATE REASON FOR CHANGE
1 11/1997 Original.
2 03/1998 Updated to include warning and caution statements and modification procedure for 240 VAC operation.
3 07/1999 Updated to include F-type signal connector, changed format.
4 09/2004 Updated to describe new logic for alarms (single failure closes alarm contacts).
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: (952) 938-8080
Fax: (952) 917-1717
ADCP-61-810 • Issue 4 • September 2004 • Preface
Page iii
© 2004, ADC Telecommunications, Inc.
TABLE OF CONTENTS
Content Page
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Admonishments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
General Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Redundant Amplifier Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Dual A/B Switch Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 Dual Alarm Monitor Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.4 Graphical User Interface—“SWatch” Switch Monitoring System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.1 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.1.1 Redundant Amplifier Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.1.2 Dual A/B Switch Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.3 Dual Alarm Monitor Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Physical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Technical Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Redundant Switch Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1.1 Redundant Amplifier Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1.2 A/B Switch and Dual Alarm Monitor Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.3 Optional Setup Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 220 to 240 VAC Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 SETUP AND OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Initial Setup and Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 Calibration—Redundant Amp Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3 Initial Setup and Operation—A/B Switch Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3.1 Installing A/B Switch Mode Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3.2 Entering A/B Switch Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4 Setup for A/B Switch Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.5 Output Calibration—A/B Switch Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6 Single A/B Switch Mode Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7 Initial Setup and Operation—Dual Alarm Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.8 System Reset Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1 Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2 Fuse Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6 CUSTOMER INFORMATION AND ASSISTANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
ADCP-61-810 • Issue 4 • September 2004 • Preface
Page iv
© 2004, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 4 • September 2004 • Preface
Page v
© 2004, ADC Telecommunications, Inc.
ABOUT THIS MANUAL
This user manual describes the ADC RF Worx Redundant Switch and associated SWatch switch
monitoring software. This user manual provides installation, operation, and maintenance
instructions.
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.
GENERAL SAFETY PRECAUTIONS
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.
Warning: Wet conditions increase the potential for receiving an electrical shock when
installing or using electrically-powered equipment. To prevent electrical shock, never install or
use electrical equipment in a wet location or during a lightning storm.
ADCP-61-810 • Issue 4 • September 2004 • Preface
Page vi
© 2004, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 4 • September 2004
Page 1
© 2004, ADC Telecommunications, Inc.
1 GENERAL
The ADC RF Worx Redundant Switch, shown in Figure 1, 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 (RDS-B) or F connectors (RDS-F) on the rear panel. All operating
controls and indicators are on the front panel.
The RF bandwidth used with this equipment is that of the CATV forward path video (i.e., 50 to
1000 MHz).
1.1 Redundant Amplifier Mode
In the “redundant amplifier” mode of operation, the function of the RDS is to monitor the RF
signal gain of an operating (primary) amplifier and switch to a backup (standby) amplifier if the
gain of the primary amplifier falls below a set point. When an amplifier gain failure occurs, the
RDS rapidly switches the input power and then the input and output RF connections from the
failed primary amplifier to its backup amplifier. Status and failure LEDs are mounted on the
front panel of the redundant switch. An RS-485 interface also provides amplifier calibration
data (i.e., date and time) and operating/failure status to a Windows 95/98/NT personal computer
(PC) equipped with 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.
Figure 1. Redundant Switch (RDS)
1.2 Dual A/B Switch Mode
In the “dual A/B switch” mode of operation, the RDS monitors the primary input signal,
automatically detects when the primary input signal has decreased in power (dBmV) more than
the threshold amount set on the front panel of the switch, then automatically switches to the
backup signal. In this mode, only the output of the receiver or amplifier is switched, not the
input and output. This mode is used to provide redundancy to amplifiers or receivers used
anywhere in the forward path cable TV network.
O
P
E
R
A
T
IN
G
C
A
L
IB
R
A
T
IO
N
N
O
R
M
A
L
S
W
IT
C
H
IN
G
T
H
R
E
S
H
O
L
D
(-R
)
B
A
S
IN
G
L
E
F
A
IL
U
R
E
L
O
S
S
O
F
IN
P
U
T
D
U
A
L
F
A
IL
U
R
E
SELECT
SELECT
STATUS
9134-B
2A 240V
V: 38.4
–57.6 VDC/100/120/240 VAC
Ø: 1
A: 1A MAX DC / 2A MAX AC
HZ: 47
–63 HZ
U
R
PA
TENT PENDIN
G
ADCP-61-810 • Issue 4 • September 2004
Page 2
© 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/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. All status
conditions for each pair of receivers are available locally and remotely via the optional SWatch
switch monitoring software.
1.3 Dual Alarm Monitor Mode
The “dual alarm monitor” mode can be used to monitor RF signals anywhere in the forward
path of the network—such as the output signal from any critical amplifier or receiver. The RDS
can monitor two RF signals independently in this mode. Alarms will be triggered when the RF
signal level of either signal falls below the preset threshold (i.e., no switching will occur).
1.4 Graphical User Interface—“SWatch” Switch Monitoring System
The SWatch GUI software for the RDS can be purchased separately from ADC
Telecommunications. The program provides continuous remote monitoring of the RDS and
associated systems. It is designed for Windows 95/98/NT systems with a 90 MHz (or faster)
Pentium Processor.
2 DESCRIPTION
This section provides functional, physical, and technical descriptions of the RDS Redundant
Switch.
2.1 Functional Description
The RDS has several distinct and unique modes of operation, including redundant amplifier
mode, dual A/B switch mode, and dual alarm monitor mode. The following paragraphs describe
these various operational modes.
2.1.1 Redundant Amplifier Mode
Figure 2 is a block diagram showing the redundant switch configured for “redundant amplifier”
mode operation. 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 front-panel mounted SWITCHING THRESHOLD switch and digital display used for
setting the gain trip level (2 to 7 dB down from the amplifier reference level), the Primary AMP
SELECT switch, and the MODE SELECT (NORMAL/CALIBRATION) switch. When
triggered by a Primary amplifier gain failure, the logic and control circuits switch on input
power to the backup amplifier, then, after a 13 msec delay, the RF In and RF Out signals are
also switched over to the backup amplifier (total elapsed time equals approximately 50 msec).
ADCP-61-810 • Issue 4 • September 2004
Page 3
© 2004, ADC Telecommunications, Inc.
After successfully switching to the backup amplifier, input power to the Primary amplifier is
turned off.
A single failure condition is indicated on the front panel of the RDS and through the SWatch
monitoring software. In addition, a single failure condition causes the RDS to close the
Normally Open (NO) alarm relay contacts on the rear panel.
Figure 2. Block Diagram for Redundant Amplifier Mode Operation
If, in a single failure condition the backup amplifier gain also fails, a “dual failure condition” is
indicated on the front panel of the RDS and through the SWatch monitoring software. In such a
condition, the alarm contacts are already closed from the single failure that preceded the dual
failure. The alarm contacts remain closed in the dual failure condition.
2.1.1.1 Assured Best Failure (Redundant Amplifier Mode)
When the RDS 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 RDS uses the best possible amplifier during a dual
failure condition—to minimize service degradation/interruption.
2.1.2 Dual A/B Switch Mode
The RDS can also function as an electronic A/B switch as shown in Figure 3. This mode is used
to provide redundancy to amplifiers or receivers used anywhere in the forward path of the cable
television network.
Note: Loss of signal status, defined as a loss of input RF signal to the RDS, also causes an
alarm contact closure. In this case, the failure is in the network upstream of the RDS. Loss
of signal status is also indicated on the LOSS OF INPUT LED on the front panel of the
RDS and through the SWatch monitoring software.
RF OUTPUTRF INPUT
RF
RDS-1AA
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
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 Table 3 on Page 7.
Figure 3. Block Diagram for Dual A/B Switch Mode Operation
2.1.3 Dual Alarm Monitor Mode
This mode (shown in Figure 4) 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-2AA
BB
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-1AA
BB
RF
AMP 1
PORT 1 PORT 2
MICROPROCESSOR
CONTROL
AMP 2
COMPUTER
MONITOR &
ALARM
SYSTEM
10140-A
ADCP-61-810 • Issue 4 • September 2004
Page 5
© 2004, ADC Telecommunications, Inc.
In this mode, the RDS monitors one or two RF signals independently. Alarms will trigger when
the RF signal level of one (or both) inputs fall below the preset threshold for that port (1 or 2).
This mode of operation is virtually the same as the A/B switch mode, except that the RDS is
programmed not to switch from the A to B side when a failure is detected—the failure is simply
logged and identified. The output power levels of the receivers or amplifiers being monitored
must fall within the input power ranges for the RDS specified in Table 3 on Page 7.
2.2 Physical Description
Figure 5 and Figure 6 show physical dimensions of the RDS.
Figure 5. Top View With Dimensions
Figure 6. Front View With Dimensions
17.20 IN.
(43.69 CM)
7.44 IN.
(18.9 CM)
12.0 IN.
(30.5 CM)
CABLE
MANAGEMENT
BAR
12215-C
2
A
2
4
0
V
V
: 3
8
.4
–
5
7
.6
V
D
C
/1
0
0
/1
2
0
/2
4
0
V
A
C
Ø
: 1
A
: 1
A
M
A
X
D
C
/ 2
A
M
A
X
A
C
H
Z
: 4
7
–
6
3
H
Z
UR
1.25 IN.
(3.18 CM)
1.75 IN.
(4.45 CM)
18.31 IN.
(46.51 CM)
18.98 IN.
(48.21 CM)
10152-C
PATENT PENDING
ADCP-61-810 • Issue 4 • September 2004
Page 6
© 2004, ADC Telecommunications, Inc.
Figure 7 shows the front panel of the RDS. The components are identified by letters and
described in Table 1.
Figure 7. RDS Front Panel With Identified Parts
Figure 8 shows the rear panel of the RDS. The components are identified by letters and
described in Table 2.
Figure 8. RDS Rear Panel With Identified Parts
Table 1. Front Panel Components
LETTER NAME DESCRIPTION
A SWITCHING THRESHOLD display Indicates the amp being displayed and the threshold at which
each amp (A or B) will switch. Displays start-up sequence status
B SWITCHING THRESHOLD toggle
switch
Adjusts the threshold for the active port
C CHANNEL A LED When lit, indicates A is the active side
D AMP SELECT toggle switch Selects active amp A or B for REDUNDANT AMP mode
E CHANNEL B LED When lit, indicates B is the active side
FNORMAL LED When lit, shows that the unit is functioning in NORMAL mode
G MODE SELECT toggle switch Selects NORMAL or CALIBRATION mode
H CALIBRATION LED When lit, indicates unit is in CALIBRATION mode
I OPERATING LED When lit, indicates monitoring equipment is operating normally
J SINGLE FAILURE LED When lit, indicates a failure of one of the amplifiers
KLOSS OF INPUT LED When lit, indicates that there has been a loss-of-signal (higher in
the network) and the unit is not functioning
LDUAL FAILURE LED When lit, indicates that failures have been detected on both
amplifiers (A and B)
12513-A
PATENT PENDING
A B C D E F G H I J K L
RS-485
IN
A B RF A B RF
–48DC
1A MAX
OUT
IN OUT A OUT B
ALARM
NO C
–+–+–+
12376-A
100/120/240 VAC
(100/120/240 VAC 100W MAX) / OUTLET
PORT 1 PORT 2
A
B
SEE USER MANUAL
FOR OPERATING VOLTAGE
A
BC
D
E
F
ADCP-61-810 • Issue 4 • September 2004
Page 7
© 2004, ADC Telecommunications, Inc.
2.3 Technical Description
Table 3 lists specifications for the RDS.
Table 2. Rear Panel Components
LETTER NAME DESCRIPTION
A Frame Ground Screw Grounds the unit to the equipment rack/frame
B BNC/F-Type Connectors Connects the unit to network equipment
C RS-485 Receptacles Input and output for personal computer (with SWatch switch
monitoring software) interface cables
D Alarm-DC Terminal Block Alarm and –48 V battery power DC power connections
E AC Power Out Receptacles 120 VAC outputs for powering external equipment
F AC Power Input Receptacles Connects the unit to 120 VAC power supply
Table 3. RDS Specifications
PARAMETER SPECIFICATION REMARKS
Physical
Panel Dimensions
(H x W x D)
1.75
× 19 × 12 inches
(4.45
× 48.26 × 30.48 cm)
Cable tie bar extends 4 inches
(10.16 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
Current Input
75 mA Typical
RF Switch
2 SPDT per panel
Bandwidth
50 – 1,000 MHz
Insertion Loss
–0.7 dB Typical
Return Loss
–25 dB Typical
Isolation
–67 dB Typical Port to Port
Input Power Range
28 to 47
34 to 46
Port 1, 8 channels
Port 2, 8 channels
25 to 44
31 to 43
Port 1, 16 channels
Port 2, 16 channels
Input Power Range 19 to 38
25 to 37
Port 1, 62 channels
Port 2, 62 channels
(dBmV per channel) 18 to 37
24 to 36
Port 1, 79 channels
Port 2, 79 channels
16 to 35
22 to 34
Port 1, 117 channels
Port 2, 117 channels
15 to 34
21 to 33
Port 1, 135 channels
Port 2, 135 channels
ADCP-61-810 • Issue 4 • September 2004
Page 8
© 2004, ADC Telecommunications, Inc.
3 INSTALLATION
3.1 Redundant Switch Installation
Use the following procedure to install and cable the redundant switch in a 19-inch network rack,
or equivalent.
1. At the designated rack location, align the mounting holes in the switch mounting ears with
the threaded holes in the rack, then mount the redundant switch on the rack with four #12-
24 screws. (See Figure 9.)
2. Using AWG 18 (or larger) stranded wire, connect frame ground to the frame ground screw
in the lower left corner of the rear panel (see Figure 10).
Switching time 50 milliseconds, maximum
Switch action on
power failure
Retain position Calibration data retained for
8 hours, minimum
Detection Points On “RF” connector, both ports
Gain threshold or
trip point
Adjustment
–2 to –7 dB (A “Guard Band” of 0.5 dB is added to all
threshold settings to prevent premature switching; i.e.,
when setting = 3 dB, 3.5 dB is used as the switching point.)
± 1.0 dB (To maintain accuracy
after an extreme change in input
signal level or operating
temperature, unit may require “Re-
calibration” at the new condition.)
Alarms Front panel LEDs, and RS-485 data interface, dry
contacts normally open
Environmental
Temperature
Operating 0°C to + 50°C (+32°F to 122°F) (Note 3)
Storage –40°C to +70°C (–40°F to +158°F)
Humidity
Operating 10 to 90% No condensation
Storage 5 to 95% No condensation
Warning: Never install video equipment in a wet location or during a lightning storm.
Table 3. RDS Specifications, continued
PARAMETER SPECIFICATION REMARKS
ADCP-61-810 • Issue 4 • September 2004
Page 9
© 2004, ADC Telecommunications, Inc.
Figure 9. Installing Redundant Switch in Rack
Figure 10. Rear View of Redundant Switch
O
P
E
R
A
T
IN
G
C
A
L
IB
R
A
T
IO
N
N
O
R
M
A
L
S
W
IT
C
H
IN
G
T
H
R
E
S
H
O
L
D
(-R
)
B
A
S
IN
G
L
E
F
A
IL
U
R
E
L
O
S
S
O
F
IN
P
U
T
D
U
A
L
F
A
IL
U
R
E
SELECT
SELECT
STATUS
2A
240V
V: 38.4
–57.6 VD
C/100/120/240 VAC
Ø: 1
A
: 1A MAX DC / 2A MAX AC
HZ: 47
–63 HZ
U
R
9139-B
PAT
ENT PEN
DIN
G
12217-C
B
RF
A
B
RF
(1
00
/12
0
/2
40
V
A
C
1
0
0W
M
A
X
) / O
U
T
L
E
T
IN
O
U
T
10
0
/12
0/24
0 V
A
C
P
O
R
T
1
P
O
R
T
2
R
S
-4
8
5
–
48
D
C
1
A
M
A
X
IN
O
U
T
A
O
U
T
B
A
L
A
R
M
N
O
C
–+
–+
–
+
C
A
T
#
S
/
N
D
A
T
E
C
O
D
E
M
A
D
E
IN
U
S
A
SERIAL
NUMBER
A
2A 240V
V: 38.4
–57.6 VDC
/100/120/240 VAC
Ø
: 1
A: 1A M
AX DC
/ 2A M
AX A
C
HZ: 47
–63 HZ
UR
A
B
FRAME
GROUND
SCREW
ADCP-61-810 • Issue 4 • September 2004
Page 10
© 2004, ADC Telecommunications, Inc.
3.1.1 Redundant Amplifier Mode
1. Connect the designated RF cables to the RF connectors (A, B, and RF) under the PORT 1
and PORT 2 markings on the rear panel. Use Table 4 as a guide for connecting the cables.
Carefully tie wrap the cables to the cable tie bar at the rear of the switch.
2. Connect the power cords to the A and B power receptacles on the rear panel of the switch,
or (if they are powered by direct current) connect them to the DC output connections on
the DC terminal block at the rear of the switch (see Figure 11 and Figure 12).
Figure 11. RDS Rear Panel
Figure 12. Terminal Block for Alarm and DC Power Connections
3. Perform any optional steps required for your system. See Section 3.1.3 on Page 11.
4. Upon initial power-up, the front panel (green) NORMAL LED will be lit, indicating that
the internal power supply is operational. If the input power is within the range shown in
Table 3 on Page 7, the red DUAL FAILURE LED will be lit. Proceed to Section 4 on Page
13 to set up and operate the switch.
Table 4. RF Cable to RF Connector Assignments
LINE RF CONNECTOR
RF Signal In Port 1, RF
Amp Inputs Port 1, A and B
Amp Outputs Port 2, A and B
RF Signal Out Downstream equipment (Port 2, RF)
Note: If the input power is out of range, the (yellow) LOSS OF INPUT LED will be lit.
The input power must be adjusted within range prior to continuing the RDS set-up.
RS-485
IN
A B RF A B RF
–48DC
1A MAX
OUT
IN OUT A OUT B
ALARM
NO C
– + – + – +
12373-A
100/120/240 VAC
(100/120/240 VAC 100W MAX) / OUTLET
PORT 1 PORT 2
A
B
SEE USER MANUAL
FOR OPERATING VOLTAGE
12363-A
1A MAX
–
48DC
IN OUT A OUT B
ALARM
NO
C
ADCP-61-810 • Issue 4 • September 2004
Page 11
© 2004, ADC Telecommunications, Inc.
3.1.2 A/B Switch and Dual Alarm Monitor Modes
1. Connect the designated receiver output cables to connectors A and B under the PORT 1
and PORT 2 markings on the rear panel of the switch. Connect the RF jacks to the
appropriate downstream equipment. Carefully tie wrap the cables to the cable tie bar at the
rear of the switch.
2. Using a modular power cord, connect the switch to a convenient source of AC input
voltage, or (if it is to be powered by direct current) connect the DC terminal block IN
terminals (shown in Figure 12) to
–48 V battery power.
3. Perform any optional steps required for your system. See Section 3.1.3 on Page 11.
4. Upon initial power-up, the front panel (green) NORMAL and (red) DUAL FAILURE
LEDs will be lit, indicating that the internal power supply is operational. Proceed to
Section 4 on Page 13 to set up and operate the switch.
3.1.3 Optional Setup Procedures
Use the following optional procedures to setup the RDS (if applicable to your system
configuration).
1. Connect RS-485 interface cables from a personal computer (PC) with switch monitoring
software to the RS-485 IN and OUT connectors on the rear panel of the switch. This
connection can be via a daisy chain to/from other switch panels. (See Figure 13.)
Figure 13. Daisy Chained RDS Units
2. Connect two 22-26 AWG wires to the alarm terminals at the rear panel labeled ALARM
NO (normally open) and C (common). (See Figure 12 on previous page.) The other ends
of the wires can be connected to the user’s alarm panel at the installation location.
Note: For operation as a single A/B Switch, use PORT 2 only.
Note: If the total cable length exceeds 1,000 feet, termination per requirements of the
RS485 Card Adapter Specification may be required.
Warning: The RDS is factory set for –48 VDC or 120 VAC operation. For 240 VAC operation,
refer to subsection 3.2, 220 to 240 VAC Operation, below.
RS-485
IN OUT
RS-485
IN OUT
RS-485
IN OUT
REMOTE
MONITOR
UP TO EIGHT
RS-485 BUSES
UP TO 32 REDUNDANT
AMP SWITCHES IN
EACH DAISY CHAIN
FOR A SYSTEM MAXIMUM OF 250
9402-B
ADCP-61-810 • Issue 4 • September 2004
Page 12
© 2004, ADC Telecommunications, Inc.
3.2 220 to 240 VAC Operation
The RDS is factory set for –48 VDC or 120 VAC operation, with “115V” showing as the
voltage setting in the power inlet module window (Figure 14). For 220 to 240 VAC operation,
do the following:
Figure 14. Power Inlet Module
1. Make sure the power cord is removed from the power inlet module before continuing.
2. Pry open the power inlet module door from the right side using a small screwdriver or
equivalent.
3. Remove the fuse module using a small screwdriver or equivalent.
4. Rotate the fuse module 180° so that the text “230V” will show through the power inlet
module window when the door is closed.
5. Place the fuse module back into the power inlet module, making sure that the fuse module
is seated properly.
6. Close the power inlet module door, making sure that it snaps firmly into place and that
“230V” does show through the window.
7. Connect the correct type of power cord corresponding to the local electrical code.
8. The front panel (green) NORMAL and (red) DUAL FAILURE LEDs (shown in
Figure 15) will be lit indicating that the internal power supply is operational. Proceed to
Section 4 to set up and operate the switch.
Caution: The –48 VDC connections available for powering external amplifiers are unfused, so
extreme care must be taken in ensuring the external amplifiers have built-in fuse protection.
Note: The RDS is supplied with three detachable power cords for 120 VAC operation. For
240 VAC operation, consult your local electrical code for the correct type or style of power
cords required.
10779-B
100/120/240 VAC
WINDOW
FUSE
MODULE
ADCP-61-810 • Issue 4 • September 2004
Page 13
© 2004, ADC Telecommunications, Inc.
Figure 15. RDS Front Panel
4 SETUP AND OPERATION
This section explains how to set up and operate the RF Worx Redundant Switch (RDS) in
redundant amplifier mode, A/B switch mode, or dual alarm monitor mode. Included here are the
differences in setup and configuration, operation, and trouble-shooting.
4.1 Initial Setup and Alarm
Once the RDS and associated amplifiers are powered-up, set up and operate the RDS as follows
(refer to Figure 15 above) :
1. Check that the front panel (green) NORMAL and (red) DUAL FAILURE LEDs are lit.
When both amplifiers are warmed up to ambient operating temperature, adjust their output
levels, then use the AMP SELECT toggle switch to select amplifier A or amplifier B for
calibration. Note that the corresponding LED (A or B) illuminates and the (yellow)
CALIBRATION LED begins to flash
2. Select the desired failure threshold (number of dB down from initial amplifier gain) by
observing the SWITCHING THRESHOLD seven-segment LED display at the left end of
the front panel while you momentarily press the adjacent toggle switch up (to increase) or
down (to decrease) until the desired threshold number is displayed. The threshold is the
level below which the calibrated signal must drop before switching from the primary to the
standby receiver or amplifier.
Note: The system performs internal diagnostics after power-up to ensure proper operation.
After power-up a lower case “c” will be displayed for one minute. The “c” will
immediately disappear if communication with the Swatch switch monitoring software is
established. In rare instances, an A or B may show continuously in the display when
powering up. This indicates that an internal failure has occurred. For assistance, contact
ADC (see Section 6 on Page 18).
Note: Be sure to make the final adjustment of each amplifier’s output before calibrating
the switch.
9216-D
PATENT PENDING
ADCP-61-810 • Issue 4 • September 2004
Page 14
© 2004, ADC Telecommunications, Inc.
4.2 Calibration—Redundant Amp Mode
1. Momentarily press the MODE SELECT switch to CALIBRATION; note that the
CALIBRATION LED remains lighted (steady yellow); after a second, the red DUAL
FAILURE LED will go out and the yellow SINGLE FAILURE LED will light and remain
on.
2. Select the remaining amplifier (B or A) with the AMP SELECT switch. Note that the
corresponding LED lights and the (yellow) CALIBRATION LED again begins to flash.
3. Momentarily press the MODE SELECT switch to CALIBRATION; note that the
CALIBRATION LED remains lighted (steady yellow); after a second, the yellow SINGLE
FAILURE LED will go out and the green OPERATING LED will light and remain on.
4. Select the Primary Amplifier (A or B) using the AMP SELECT toggle switch on the front
panel; the corresponding LED should light and remain lighted after the amplifier is
selected. The OPERATING LED should continue indicating green.
4.3 Initial Setup and Operation—A/B Switch Mode
4.3.1 Installing A/B Switch Mode Label
Included with the RDS is an add-on label (Figure 16) that can be installed to identify any units
that are programmed for A/B switch mode operation. Using the SWITCHING THRESHOLD
switch and the left edge of the chassis for alignment, affix the label to the left end of the front
panel display as shown in Figure 17.
Figure 16. A/B Switch Mode Label
Note: The calibration process will monitor the amplifier gain and set the RDS to expect
that particular gain from the amplifier.
Note: To ensure reliable network performance, it is recommended that a failure test be
conducted to verify that the threshold setting switches the RDS to the backup amplifier at
an acceptable signal level.
(–dB)PATENT PENDING
SWITCHING
THRESHOLD
PORT 1
PORT 2
A/B SWITCH
10138-A
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17
-
18
-
19
-
20
-
21
-
22
-
23
-
24
-
25
-
26
ADC RF Worx is a redundant switch designed to monitor the RF signal gain of an operating (primary) amplifier and switch to a backup (standby) amplifier if the gain of the primary amplifier falls below a set point.
When an amplifier gain failure occurs, the RDS rapidly switches the input power and then the input and output of the failed amplifier to the backup amplifier. It also provides a switch closure to indicate an amplifier failure.
In addition to redundant amplifier mode, the RDS can also be used in A/B switch mode or dual alarm monitor mode.
In A/B switch mode, the RDS can be used to switch between two input signals.
Ask a question and I''ll find the answer in the document
Finding information in a document is now easier with AI
Related papers
-
ADC RF Wofx User manual
-
-
-
-
-
-
-
-
-
