ADCP-61-810
Issue 3
July 1999
RF Worx™
Redundant Switch (RDS) User Manual
2A
240V
V:
Ø: 38
A: 1 .4–57.6
HZ: 1A MAX
VDC/
47–6
100/
3 HZ DC / 2A
120/
240
MAX
VAC
AC
UR
SW
IT
THRECHING
SHO
LD
PATE
NT PE
NDING
(-R)
A
B
SEL
ECT
NORM
AL
CALI
SEL
ECT
BRAT
ION
OPE
RATI
NG
SING
FAIL LE
URE
LOSS
INPUOF
T
STA
TUS
DUAL
FAIL
URE
9134-B
1063291 Rev A
ADCP-61-810 • Issue 3 • July 1999 • Preface
COPYRIGHT
 1999, ADC Telecommunications, Inc.
All Rights Reserved
Printed in the U.S.A.
REVISION HISTORY
ISSUE
DATE
REASON FOR CHANGE
Issue 1
11/97
Original.
Issue 2
03/98
Updated to include warning and caution statements and modification procedure
for 240 VAC operation. Also, added caution statement for fuse replacement.
Issue 3
07/99
Updated to include F-type RF signal connector, changed format.
TRADEMARK INFORMATION
Pentium is a registered trademark of the Intel Corporation.
ADC and ADC Telecommunications are registered trademarks of ADC Telecommunications, Inc.
RF WORX is a registered trademark 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 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: (612) 938-8080
Fax: (612) 946-3292
Page ii
ADCP-61-810 • Issue 3 • July 1999 • Preface
TABLE OF CONTENTS
Content
Page
ABOUT THIS MANUAL ...................................................................... iv
ADMONISHMENTS......................................................................... iv
1
GENERAL.......................................................................... 1
1.1 Redundant Amplifier Mode ......................................................... 1
1.2 Dual A/B Switch Mode ............................................................ 2
1.3 Dual Alarm Monitor Mode.......................................................... 2
1.4 Graphical User Interface – “Swatch” Switch Monitoring Software (Optional) ....................... 2
2
DESCRIPTION ....................................................................... 2
2.1 Functional Description ............................................................ 2
2.2 Physical Description ............................................................. 5
2.3 Technical Description ............................................................ 6
3
4
5
6
INSTALLATION ...................................................................... 7
3.1
Redundant Switch Installation ...................................................... 7
3.2
220 to 240 VAC Operation .........................................................12
SETUP AND OPERATION ................................................................13
4.1
Initial Setup and Operation – Redundant Amp Mode .......................................13
4.2
Calibration – Redundant Amp Mode ..................................................13
4.3
Initial Setup and Operation – A/B Switch Mode...........................................14
4.4
Setup for A/B Switch Mode Operation .................................................14
4.5
Output Calibration – A/B Switch Mode .................................................15
4.6
Single A/B Mode Operation ........................................................16
4.7
Initial Setup and Operation – Dual Alarm/Monitor Mode ....................................16
4.8
System Reset Procedure ..........................................................17
MAINTENANCE ......................................................................17
5.1
Preventive Maintenance ..........................................................17
5.2
Fuse Replacement ..............................................................17
CUSTOMER INFORMATION AND ASSISTANCE .................................................18
Page iii
 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999 • Preface
ABOUT THIS MANUAL
This manual describes the ADC RF Worx Redundant Switch and associated SWatch switch
monitoring software and 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.
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.
Page iv
 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
RF WORX REDUNDANT SWITCH (RDS) USER MANUAL
1
GENERAL
The ADC RF Worx Redundant Switch (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 “Redundant Amplifier” operating mode, 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.
2A
240V
V:
Ø: 38
A: 1 .4–57.6
HZ: 1A MAX
VDC/
47–6
100/
3 HZ DC / 2A
120/
240
MAX
VAC
AC
UR
SW
IT
THRECHING
SHO
LD
PATE
NT PE
NDING
(-R)
A
B
SEL
ECT
NORM
AL
CALI
SEL
ECT
BRAT
ION
OPE
RATI
NG
SING
FAIL LE
URE
LOSS
INPUOF
T
STA
TUS
DUAL
FAIL
URE
9134-B
Figure 1. Redundant Switch (RDS)
Page 1
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
1.2 Dual A/B Switch Mode
In the “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.
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 Software (Optional)
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 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
Page 2
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
to the logic and control circuits. Other inputs to the logic and control circuits include the frontpanel 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 NORMAL/CALIBRATE switch (see Figure 5). 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). After successfully
switching to the Backup amplifier, input power to the Primary amplifier is turned off.
COMPUTER
MONITOR &
ALARM
SYSTEM
PRIMARY
AMP
A INPUT
A OUTPUT
POWER
A
RF INPUT
RF
PORT 1
RDS-1
A
MICROPROCESSOR
CONTROL
B
RF
RF OUTPUT
PORT 2
B
POWER
B INPUT
B OUTPUT
10141-A
STANDBY
AMP
Figure 2. Block Diagram for Redundant Amplifier Mode Operation
Note: Single failure status does not cause an alarm contact closure since the RDS is in
Backup mode and service has not been affected. However, the single failure condition is
indicated on the front panel of the RDS and through the SWatch monitoring software.
Note: Dual failure status will cause an alarm condition because service has been
interrupted. In addition, the dual failure condition is indicated on the front panel of the
RDS and through the SWatch monitoring software.
Note: Loss of signal status, defined as a loss of input RF signal to the RDS, does not
cause an alarm contact closure since the failure is in the network upstream of the RDS.
However, the loss of signal condition is indicated on the front panel of the RDS and
through the SWatch monitoring software.
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 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.
Page 3
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
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. A dual
failure condition 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 1.
PRIMARY
RECEIVER/
AMP
REDUNDANT
FIBER OPTIC
TRANSPORT
SYSTEM
RF
OUTPUT
#1
PRIMARY
RECEIVER/
AMP
A
RDS-1
RF
PORT 1
MICROPROCESSOR
CONTROL
B
COMPUTER
MONITOR &
ALARM
SYSTEM
A
RF
PORT 2
RF
OUTPUT
#2
B
10137-don
STANDBY
RECEIVER/
AMP
STANDBY
RECEIVER/
AMP
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. 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 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 1.
COMPUTER
MONITOR &
ALARM
SYSTEM
AMP 1
AMP 1
OUTPUT
AMP 2
A
RF
PORT 1
B
RDS-1
MICROPROCESSOR
CONTROL
A
RF
AMP 2
OUTPUT
PORT 2
B
10140-A
Figure 4. Block Diagram for Dual Alarm-Monitor Operation
Page 4
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
2.2 Physical Description
Figure 5 shows the front panel of the RDS. The parts are identified by letter and include a
brief description.
PATENT PENDING
12513-A
A
B
C
D
E
F
G
H
I
J
K
L
Figure 5. Front Panel of RDS
LETTER
A
NAME
DESCRIPTION
SWITCHING THRESHOLD
display
Indicates the amp being displayed and the threshold
at which each amp (A or B) will switch.
Displays the start-up sequence status
B
SWITCHING THRESHOLD
toggle switch
Adjusts the threshold for the active port
C
CHANNEL A LED
When lit, shows A as the active side
D
AMP SELECT toggle switch
Selects active amp A or B for REDUNDANT AMP
mode
E
CHANNEL B LED
When lit, shows B as the active side
F
NORMAL 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, shows that the unit is in CALIBRATION
mode
I
OPERATING LED
When lit, shows that the monitoring equipment is
operating normally
J
SINGLE FAILURE LED
When lit, shows that there has been a failure of one
of the amplifiers.
K
LOSS OF INPUT LED
When lit, indicates that there has been a loss-of-signal
(higher in the network) and the unit is not functioning.
L
DUAL FAILURE LED
When lit, indicates that failures have been detected
on both amplifiers (A and B)
Page 5
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
Figure 6 shows the rear panel of the RDS. The parts are identified by letter and include a brief
description.
PORT 1
A
B
RS-485
PORT 2
RF
A
B
IN
RF
OUT
–48DC
1A MAX
IN OUT A OUT B
NO C – + – + – +
(100/120/240 VAC 100W MAX) / OUTLET
A
A
B
C
100/120/240 VAC
ALARM
B
E
D
SEE USER MANUAL
FOR OPERATING VOLTAGE
F
12376-A
Figure 6. Rear Panel of RDS
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
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 Receptacle
Connects the unit to 120 VAC power
supply
2.3 Technical Description
Table 1. Specifications
PARAMETER
SPECIFICATION
REMARKS
Physical
Panel Dimensions 1.75 × 19 × 12 inches
(H × W × D)
(4.45 × 48.26 × 30.48 cm)
Cable tie bar extends 4" (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
Insertion Loss
50 – 1,000 MHz
–0.7 dB Typical
Return Loss
–25 dB Typical
Isolation
–67 dB Typical
Port to Port
(continued)
Page 6
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
Table 1. Specifications, continued
PARAMETER
Input Power Range
(dBmV per channel)
SPECIFICATION
REMARKS
28 to 47
34 to 46
25 to 44
31 to 43
19 to 38
25 to 37
18 to 37
24 to 36
16 to 35
22 to 34
15 to 34
21 to 33
Port 1, 8 channels
Port 2, 8 channels
Port 1, 16 channels
Port 2, 16 channels
Port 1, 62 channels
Port 2, 62 channels
Port 1, 79 channels
Port 2, 79 channels
Port 1, 117 channels
Port 2, 117 channels
Port 1, 135 channels
Port 2, 135 channels
Switching time
50 milliseconds, maximum
Switch action on
power failure
Retain position
Detection Points
On “RF” connector, both ports
Gain threshold or
–2 to –7 dB, (A “Guard Band” of
trip point Adjustment 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.)
Alarms
Calibration data retained for
8 hours, minimum
±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.)
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)
Storage
–40°C to +70°C (–40°F to +158°F)
(Note 3)
Humidity
3
Operating
10 to 90%
No condensation
Storage
5 to 95%
No condensation
INSTALLATION
3.1 Redundant Switch Installation
Warning: Never install video equipment in a wet location or during a lightning storm.
Use the following procedure to install and cable the redundant switch in a 19-inch network rack, or
equivalent. Panel dimensions are shown in the front and top views in Figures 9 and 10 on page 10.
Page 7
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
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 7.)
SW
ITC
THRE HING
SHOL
D
AM
PLIF
IER
SW
ITCH
(-R)
A
B
SEL
ECT
NORM
AL
CALIB
SEL
ECT
RATIO
N
OPER
ATIN
G
SING
FAILULE
RE
LOSS
INPUOF
T
STA
TUS
DUAL
FAILU
RE
RF W
ORX
9139-A
Figure 7. Installing Redundant Switch in Rack
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 8).
Page 8
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
FRAME
GROUND
SCREW
A
POR
T1
B
RF
A
RU
POR
T2
V:
Ø 38
A: : 1 .4–57.6
HZ: 1A MAX
VDC/
47–6
100/
3 HZDC / 2A
120/
240
MAX
VAC
AC
B
RF
RS-4
85
IN
OUT
ALAR
M
NO
IN
C
–48D
1A M C
AX
OU
– + T A OU
TB
– +
– +
(100
/120
/240
VAC
100W
A
MAX
) /
OUT
LET
2A
100/
120/
240
B
240V
TE
DADE
CO
T#
CA
DE
S/N
MAUSA
 IN
VAC
12217-C
SERIAL
NUMBER
PORT 1
A
B
RS-485
PORT 2
RF
A
B
RF
IN
OUT
–48DC
1A MAX
IN OUT A OUT B
NO C – + – + – +
100/120/240 VAC
(100/120/240 VAC 100W MAX) / OUTLET
ALARM
A
B
SEE USER MANUAL
FOR OPERATING VOLTAGE
12373-A
Figure 8. Rear Views of Redundant Switch
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 of the switch. Use Table 2 as a guide for
connecting the cables. Carefully tie wrap the cables to the cable tie bar at the rear of the
switch.
Table 2. 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)
2. Connect the power cords to the Port A and Port B power receptacles on the rear panel of
the switch, or (if they are powered by direct current) connect them to the corresponding
DC output connections on the terminal block (Figure 8) at the rear of the switch.
3. Perform any optional steps required for your system. See Section 3.1.3.
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 to set up and operate the switch.
Page 9
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
3.1.2
A/B 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.
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.
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 (Figure 12) to -48 V battery power.
3. Perform any optional steps required for your system. See Section 3.1.3.
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 to set up and operate the switch.
1.75 IN.
(4.45 CM)
1.25 IN.
(3.18 CM)
PATENT PENDING
18.31 IN.
(46.51 CM)
10152-B
18.98 IN.
(48.21 CM)
Figure 9. Front View of RDS (with Dimensioned Mounting Ears)
RU
V: 38.4–57.6 VDC/100/120/240 VAC
Ø: 1
A: 1A MAX DC / 2A MAX AC
HZ: 47–63 HZ
2A 240V
17.20 IN.
(43.69 CM)
12215-B
Figure 10. Top View of RDS
Page 10
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
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 11.)
RS-485
IN OUT
RS-485
IN OUT
RS-485
IN OUT
UP TO 32 REDUNDANT
AMP SWITCHES IN
EACH DAISY CHAIN
UP TO FOUR
RS-485 BUSES
REMOTE
MONITOR
9402-A
Figure 11. 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.) The other ends of the wires can
be connected to the user’s alarm panel at the installation location.
ALARM
NO
IN
– 48DC
1A MAX
OUT A OUT B
C
12363-A
Figure 12. Terminal Block for Alarm and DC Power Connections
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.
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.
PATENT PENDING
9216-C
Figure 13. RDS Front Panel (without Mounting Ears)
Page 11
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
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:
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.
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 will be lit (refer to
Figure 13) indicating that the internal power supply is operational. Then proceed to
Section 4 to set up and operate the switch.
FUSE = 2A x 2
110
OR
220
V
A
C
10779-A
FUSE
MODULE
WINDOW
Figure 14. Power Inlet Module
Page 12
© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
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.
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. Contact ADC
(Section 6) for assistance.
4.1 Initial Setup and Operation – Redundant Amp Mode
Once the RDS and associated amplifiers are powered-up, set up and operate the RDS (Figure 15)
as follows:
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.
Note: Be sure to make the final adjustment of each amplifier’s output before calibrating
the switch.
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.
PATENT PENDING
9216-C
Figure 15. Front Panel (Redundant Amp Mode)
4.2 Calibration – Redundant Amp Mode
Note: The calibration process will monitor the amplifier gain and set the RDS to expect
that particular gain from the amplifier.
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.
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ADCP-61-810 • Issue 3 • July 1999
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 NORMAL 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 STATUS LED should continue indicating green.
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.
4.3 Initial Setup and Operation – A/B Switch Mode
4.3.1
Installing A/B 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 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.
SWITCHING
THRESHOLD
PORT 1
A/B SWITCH
PORT 2
PATENT PENDING
(–dB)
10138-A
Figure 16. A/B Switch Mode Label
4.3.2
Entering A/B Switch Mode
To enter A/B mode, power-up the unit and hold the SWITCHING THRESHOLD switch to the
“down” position until the lower-case “c” appears on the THRESHOLD DISPLAY.
Note: If necessary, the unit can be switched back to the redundant amplifier mode later
by holding the SWITCHING THRESHOLD switch in the “up” position while powering
up. The RDS memory retains the selected mode while the unit is shut off.
4.4 Setup for A/B Switch Mode Operation
Setup for A/B switch mode is accomplished by first selecting which port is to be configured.
After initial power-up, the front panel status should indicate normal and dual failure status. The
top and bottom segments of the 7-segment display indicate which port status is currently
displayed. After initial power-up, the display will alternately indicate status for port 1 and port 2
by flashing either the top or bottom segment for approximately two seconds while displaying
threshold and status information for the associated port (Port 1 or Port 2).
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ADCP-61-810 • Issue 3 • July 1999
SWITCHING
THRESHOLD
PORT 1
A/B SWITCH
CAT NO RDS-1
A
B
NORMAL
CALIBRATION
SINGLE LOSS OF DUAL
OPERATING FAILURE INPUT FAILURE
PORT 2
PATENT PENDING
(–dB)
AMP SELECT
MODE SELECT
STATUS
™
10139-A
Figure 17. RDS Front Panel with A/B Switch Mode Label Installed
Port 1 can be configured by toggling the threshold switch to the “up” position. The display
will then lock on to the status indications for port 1. If no changes are made within 15
seconds, the display will then revert to its alternating port1/port2 flashing display. While
locked onto port 1, the user should calibrate the base level of the receiver using the procedure
described below. After the RDS is calibrated, the user can lock onto the designated primary
receiver/amplifier (A or B) with the AMP SELECT switch, then set the desired threshold level
with the SWITCHING THRESHOLD toggle switch. The threshold set in this mode of
operation will be the level below which the calibrated signal must drop before switching from
the primary to standby receiver/amplifier. For example, if Receiver A is calibrated with a 40
dBmV power level and the threshold is set for 3 dB down, the RDS will switch to Receiver B
whenever the “A” signal level falls below 40 - 3 = 37 dBmV. The above procedure is then
repeated for Port 2 after selecting Port 2 by pressing the threshold switch “down.”
4.5 Output Calibration – A/B Switch Mode
Note: The calibration process will monitor the amplifier or receiver output level and set
the switch to expect that particular signal level.
1. While “locked onto” Port 1 display, momentarily press the MODE SELECT switch to
CALIBRATION; note that the CALIBRATION LED remains lit (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 (or receiver) (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 NORMAL LED will light and remain on.
4. Select the Primary Amplifier or Receiver (A or B) using the AMP SELECT toggle
switch on the front panel; the corresponding LED should light and remain lit after the
amplifier or receiver is selected. The OPERATING STATUS LED should continue
indicating green.
5. For dual operation, repeat steps 1 through 4 after selecting Port 2.
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 receiver at
an acceptable signal level.
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© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
4.6 Single A/B Mode Operation
If only one port of the RDS is needed for A/B mode, use the same procedure to set up the port, then
calibrate the unused port with no signal present in order to remove the failure status for the unused
port. In the SWatch switch monitoring software, use the Edit Setup mode to fill the description field
for the unused port with “INACTIVE” to signify that the port is not currently used.
4.7 Initial Setup and Operation – Dual Alarm Monitor Mode
Following the A/B setup procedure above will program the RDS in Dual Alarm Monitor
Mode, including installation of the A/B Mode label. During the calibration procedure, the
RDS is calibrated for the “A” signal on port 1, then calibrated for the “B” side with no signal
present. Since the “B” signal level is below a detectable level, the RDS now knows to never
automatically switch to the “B” side. Once this has been done, the only way to switch
receivers from A to B is to use the AMP SELECT switch. The same procedure is followed for
port 2 to set it up for dual operation.
Note: Be sure to make the final adjustment of the amplifier or receiver output before
calibrating the switch.
If only one port is used, the unused port should have its “A” and “B” sides calibrated with no
signal to clear the alarm status. Also, the edit setup window in the SWatch switch monitoring
software should be used to identify that the unused port is “INACTIVE” by entering this
description in the Amp Description field.
Once the redundant switch and associated receivers or amplifiers are powered-up, operate the
switch (see Figure 18) as follows:
Note: Be sure to make the final adjustment of the amplifier or receiver output before
calibrating the switch.
1. Select the desired failure threshold (the number of dB down from the original signal
level) 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.
Note: To ensure reliable network performance it is recommended that a failure test be
conducted to verify that the threshold setting triggers the RDS alarm at an acceptable
signal level.
PATENT PENDING
9216-C
Figure 18. RDS Front Panel
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ADCP-61-810 • Issue 3 • July 1999
4.8 System Reset Procedure
Use the following procedure to clear all threshold settings and all calibration info. This
procedure should be used when re-deploying the RDS to a different location or application.
1. Power down (unplug) the RDS and remove all power sources.
2. While re-powering, hold the THRESHOLD switch up to enter Redundant Amp mode.
Hold the THRESHOLD switch down to enter A/B and Alarm Monitor mode.
3. Follow the setup procedures described in section 4.
5
MAINTENANCE
Maintenance requirements of the redundant amplifier switch are minimal, consisting merely
of periodic cleaning.
5.1 PREVENTIVE MAINTENANCE
The outside of the redundant amplifier switch should be cleaned during routine headend
equipment maintenance.
5.2 Fuse Replacement
Caution: For continued safe operation and to reduce the risk of fire, replace fuses with the
same type and rating.
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© 1999, ADC Telecommunications, Inc.
ADCP-61-810 • Issue 3 • July 1999
6
CUSTOMER INFORMATION AND ASSISTANCE
For customers wanting information on ADC products or help in using them, ADC offers the
services listed below. To obtain any of these services by telephone, first dial the central ADC
telephone number, then dial the extension provided below.
The central number for calls originating in the U.S.A. or Canada is 1-800-366-3891. For calls
originating outside the U.S.A. or Canada, dial country code “1” then dial 612-946-3000.
Sales Assistance
Extension 3000
• Quotation Proposals
• Ordering and Delivery
• General Product Information
Systems Integration
Extension 3000
•
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•
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•
•
•
Complete Solutions (from Concept to Installation)
Network Design and Integration Testing
System Turn-Up and Testing
Network Monitoring (Upstream or Downstream)
Power Monitoring and Remote Surveillance
Service/Maintenance Agreements
Systems Operation
BCG Technical Assistance Center
Extension 3475
E-Mail: technical@adc.com
•
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Technical Information
System/Network Configuration
Product Specification and Application
Training (Product-Specific)
Installation and Operation Assistance
Troubleshooting and Repair
Product Return Department
Extension 3748
E-Mail: repair&return@adc.com
• ADC Return Authorization number and instructions must
be obtained before returning products.
Product information may also be obtained using the ADC web site at www.adc.com or by
writing ADC Telecommunications, Inc., P.O. Box 1101, Minneapolis, MN 55440-1101, U.S.A.
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.
© 1999, ADC Telecommunications, Inc.
All Rights Reserved
Printed in U.S.A.
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