KWS SW024 User manual

SW024
24-fold return channel switch
Manual

Contents 1
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Contents
Chapter 1 Notes on Safety, Usage, Maintenance and Service.......................................................2
1.1 Safety Instructions................................................................................................................................ 2
1.2 Instructions for Use .............................................................................................................................. 2
1.3 Maintenance of the Instrument............................................................................................................. 2
1.4 Cleaning of the Instrument ................................................................................................................... 2
1.5 Service ................................................................................................................................................. 2
1.6 Application............................................................................................................................................ 2
Chapter 2 Technical Data ...............................................................................................................3
Chapter 3 Control and Connection Elements, Pin Configurations ..................................................6
3.1 Front Panel........................................................................................................................................... 6
3.2 Rear Panel ........................................................................................................................................... 6
Chapter 4 Initial Operation ..............................................................................................................7
4.1 Mains Operation ................................................................................................................................... 7
4.2 Assembly of the 19‘‘ Installation Angles............................................................................................... 7
4.3 Connection to the AMA 310/UMS ........................................................................................................ 7
4.4 Connection of the Upstreams to be Switched ...................................................................................... 8
4.5 Downstream Input ................................................................................................................................ 8
4.6 Switch-On............................................................................................................................................. 8
Chapter 5 Operation and Operating Modes....................................................................................9
5.1 Operating Mode Selective Measuring .................................................................................................. 9
5.2 Operating Mode Summation Measurement ......................................................................................... 9
5.3 Mixing Path........................................................................................................................................... 9
5.4 Downstream Measurement .................................................................................................................. 9
Chapter 6 Instrument Management ..............................................................................................10
6.1 FPGA Version Readout...................................................................................................................... 10
Chapter 7 List of Figures...............................................................................................................11

2 Chapter 1 - Notes on Safety, Usage, Maintenance and Service
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Chapter 1 Notes on Safety, Usage, Maintenance and Service
1.1 Safety Instructions
This instrument has been built and tested in accordance with EN 61010-1, protective measures for
electronic measuring equipment. The instrument has been supplied ex works in a perfectly safe
condition. To maintain this condition and to ensure a safe operation, the user has to observe the
instructions and warnings included in this instruction for use.
The instrument corresponds to protection class II (protective insulation).
The instrument corresponds to protection type IP20 according to EN 60529.
The instrument must only be operated with supply voltages between 100-240 V with 50-60 Hz.
Discharges through pin-and-socket connectors may damage the instrument. During handling and
operation, the instrument has to be protected against electrostatic discharge.
No external voltages higher than 70 Veff must be applied to the HF input of the measuring receiver,
as otherwise the input circuits may be destroyed.
1.2 Instructions for Use
The warranty for a new instrument ends 24 months after leaving the factory.
If the instrument is opened, the warranty claim becomes void!
The technical data given in the specifications apply after a warming-up phase of approx. 10
minutes and only if all inputs not used are terminated by 75-Ωterminating resistors and the
voltage supply is connected to the instrument and it is switched on!
1.3 Maintenance of the Instrument
The instrument is maintenance-free.
1.4 Cleaning of the Instrument
The casing should be cleaned with a soft, lint-free cloth. Never use solvents such as cellulose
thinners, acetone and the like, as otherwise the front panel or the input labeling on the back might
be damaged.
1.5 Service
The service address is given on the back cover of this instruction manual.
1.6 Application
The reverse channel switch SW 024 can only be operated together with the AMA 310/UMS. A
stand-alone operation or a communication with another head-end, measuring or USB unit is not
provided.

Chapter 2 - Technical Data 3
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Chapter 2 Technical Data
FREQUENCY RANGE
USIN,i [i = 1 … 24]
5 –67 MHz
USOUT
4.32 –65.76 MHz
DSIN
45 –1218 MHz
INTERFACES
24 x USIN
F Socket / 75 Ohm (IEC 60169-24)
1 x DSIN
F Socket / 75 Ohm (IEC 60169-24)
1 x RFOUT
F Socket / 75 Ohm (IEC 60169-24)
1 x USBIN
USB-B Jack; Protocol: KWS proprietary, not USB
compliant
UPSTREAM INPUTS
RF Level (nominal)
per Modem- or
Signaling Channel
60 –75 dBµV
RF Sum Level
per Upstream Input
USIN,i
<= 90 dBµV
Transmission Loss
USIN,i → RFOUT
< 4.5 dB (up to 65 MHz)
Transmission Loss Sum Path
USIN,i → RFOUT
< 3.8 dB (up to 65 MHz)
Isolation
USIN,i → RFOUT
> 70 dB (up to 65 MHz)
Isolation
USIN,i → USIN,j
> 70 dB (up to 65 MHz)
Return Loss
USIN,i active
> 12 dB (up to 65 MHz)
Return Loss
USIN,i active
> 18 dB (up to 65 MHz)
External Voltage
< 70 Veff (DC –50 Hz)

4 Chapter 2 - Technical Data
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DOWNSTREAM INPUT
Level (nominal)
per TV channel
<= 120 dBµV
Transmission Loss
DSIN → RFOUT
< 1.0 dB (up to 868 MHz)
< 1.1 dB (up to 1002 MHz)
< 1.2 dB (up to 1218 MHz)
Return Loss
DSIN active
> 12 dB (up to 868 MHz)
> 12 dB (up to 1002 MHz)
> 12 dB (up to 1218 MHz)
Isolation
DSIN inactive →
RFOUT
> 75 dB (up to 204 MHz)
> 60 dB (up to 868 MHz)
> 56 dB (up to 1002 MHz)
> 52 dB (up to 1218 MHz)
RF Sum Power
USIN,i
< 500 mW
External Voltage
< 70 Veff (DC –50 Hz)
RF OUTPUT
Return Loss
> 12 dB (USIN,i active)
> 12 dB (DSIN active)
MIXER
Mixing of the signalization of the field units VAROS 107 in UMS measurement mode
Dual-Conversion Architecture
Input Frequency
5 –65 MHz
Intermediate Frequency (IF)
433.92 MHz
Target Frequency
4.5 MHz
Mixer Bandwidth
-3 dB
120 kHz
MISCELLANEOUS
User Display
26 x LED red
Power; USIN,1 –USIN,24; DSIN

Chapter 2 - Technical Data 5
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POWER SUPPLY
Built-in primary Power Supply Unit
Mains Connector
Plug in Accordance with IEC-60320-C8
Mains Voltage
100 –120 VAC, 200 –240 VAC, 50 –60 Hz
Power Consumption
Max. 10 W
ENVIRONMENTAL CONDITIONS
Operating Temperature
0 °C –+45 °C
Storage Temperature
-10 °C –+55 °C
Humidity
10 % –90 % (non-condensing)
ELECTROMAGNETIC COMPATIBILITY
per EN 61326-1
PROTECTION
per EN 61010-1
DIMENSIONS
approx. W: 440 mm, H: 44.45 mm, D: 275 mm
(19‘‘ / 1 RU / without clamping angle)
approx. W: 483 mm, H: 44.45 mm, D: 275 mm
(19‘‘ / 1 RU / with clamping angle)
WEIGHT
approx. 3.5 kg
QUANTITY OF DELIVERY
Included in the delivery
F patch cable (75 Ohm, to connect SW 024 to
AMA 310/UMS)
USB patch cable (USB-B → USB-A, to connect
SW 024 to AMA 310/UMS)
User Manual
Power Cable
2 pieces clamping angle for 19‘‘ rack mounting
8 pieces M4 x 8 mm crosshead screws

6 Chapter 3 - Control and Connection Elements, Pin Configurations
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Chapter 3 Control and Connection Elements, Pin Configurations
3.1 Front Panel
Figure 3-1 Front Panel USB-B-Interface (Control Input from the AMA 310/UMS)
Physically this interface is a USB-B connector.
Figure 3-2 USB-B connector
The report used and the assignment of the 4 pins of the interface are KWS proprietary. Therefore, it
is not possible to access the instrument by standard USB units (e.g. PC, notebook).
The SW 024 switch is to be connected to the AMA 310/UMS by the USB patch cable included in
delivery or by any other USB cable (USB-A on USB-B).
3.2 Rear Panel
Figure 3-3 Rear Panel

Chapter 4 - Initial Operation 7
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Chapter 4 Initial Operation
4.1 Mains Operation
The mains connection is situated on the back of the instrument. The return path switch is operated
by the two-pole mains cable connected to power. The instrument has protection class II (protection
insulation).
Caution! During installation (e.g. installing the instrument in a 19" rack) the instrument
always has to be disconnected from the supply voltage.
4.2 Assembly of the 19‘‘ Installation Angles
In case the switch SW 024 is to be installed in a 19‘‘ rack, the angles included in delivery have to
be mounted on both sides of the instrument first:
Figure 4-1 Assembly of 19'' installation angles
The assembly shall be made by means of the M4 crosshead screws included in the delivery. Each
angle has to be fixed on the casing with 4 screws as shown above. The screws have to be
tightened firmly.
4.3 Connection to the AMA 310/UMS
The switch SW 024 is to be connected to the AMA 310/UMS via two lines.
The output "Switch Control OUT" of the AMA 310/UMS is to be interconnected with the input
"Switch Control IN" of SW 024 by the USB cable supplied. The front output "OUT" of SW 024 is to
be connected to the HF input "RF-IN" of the AMA 310/UMS by the F cable bridge supplied.
The length of both cable bridges is designed for the standard arrangement provided, here the SW
024 is placed below the AMA 310/UMS or mounted in the 19" rack. In case another assembly is
used, longer cables may be chosen, but make sure that the HF connection is always as short as
possible such that the calibration is not falsified.

8 Chapter 4 - Initial Operation
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4.4 Connection of the Upstreams to be Switched
At the rear panel inputs (upstream inputs in Fehler! Verweisquelle konnte nicht gefunden
werden.) up to 24 upstream signals (e.g. different clusters or different US inputs from CMTS line
cards) may be connected.
Make sure that all F-connectors connected will be tightened sufficiently (with a torque wrench
where required).
Caution! All upstream inputs used have to be terminated with 75- Ω terminating
resistors. The technical data stated only apply if all upstream inputs are
connected to a 75 Ω network (e.g. HFC net) or terminated.
4.5 Downstream Input
For regular operation, the DS input also has to be terminated. See chapter 5.4 Downstream
Measurement for further information.
4.6 Switch-On
When the instrument is connected to the mains power supply and switched on by an ON/OFF
switch, the red power LED on the front panel lights up. In the basic condition also the Downstream
LED (DS-LED) is on. This operating mode has been provided for future applications and in
combination with the current version of the AMA 310/UMS they are not applicable.
Caution! In combination with the AMA 310/UMS the HF Switch SW 024 has to be
switched on BEFORE the AMA 310/UMS!
Depending on the operating mode (see Chapter 5) provided by AMA 310/UMS in regular operation,
no further LEDs are on in addition to the Power LED, the DS-LED or one of the US LEDs.
Caution! The specifications listed in Chapter 2 Technical Data only apply if the
instrument is connected to the mains and switched on.
Without a mains power supply the decoupling of the individual upstream inputs among each other
deteriorates significantly!

Chapter 5 - Operation and Operating Modes 9
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Chapter 5 Operation and Operating Modes
After successful installation and during the ongoing return path monitoring operation no control of
the SW 024 by the operator is required. All adjustments regarding the instrument will be made by
the operator at the AMA 310/UMS (see relevant operating instructions). During operation the SW
024 will be controlled by AMA 310/UMS via the control interface (USB, proprietary).
Below you will find a short description of the major operating modes. For detailed information we
refer to the manual of AMA 310/UMS as well as the Application Note AN006 "Upstream-Monitoring-
System UMS" (www.kws-electronic.de → "SUPPORT" →"Application Notes").
5.1 Operating Mode Selective Measuring
In this mode an upstream input channel is connected through from the AMA 310/UMS to the
output. Apart from the power LED the LED of the relevant input channel is on. Extensive
communication and remote control of the measuring system can only be done by field instruments
in the cluster connected through. The possibility of basic communication with the measuring system
also for field instruments from other clusters than the cluster connected through is possible at any
time via the mixing path (see chapter 5.3 Mixing Path).
5.2 Operating Mode Summation Measurement
In this mode a signal consisting of the sum of all 24 inputs is led to the output of SW 024. Only the
power LED is on. In the summation mode the basic noise measured at the AMA 310/UMS is higher
than in the selective measuring mode. The summation mode is always activated by the UMS
measuring system on the SW 024 if currently no field instrument requests a cluster-selective
measurement. AMA 310/UMS receives all signaling information from all field instruments without
any limitation.
5.3 Mixing Path
In order to enable field instruments to transmit signaling information to the headend unit AMA
310/UMS even if the field instrument is located in another cluster (and/or connected to another
input) than the one which is currently set for an exclusive measurement, a mixer in the SW 024
transforms a certain signaling frequency of all inputs to a frequency (4.5 MHz) below the return
path range. This frequency may be configured in the headend unit AMA 310/UMS and will always
be received and utilized by it. The activation of the mixing path is also done automatically and
requires no adjustment at the SW 024 by the operator.
5.4 Downstream Measurement
The DS measuring mode has been provided for future applications and currently it is not yet
supported by the overall system. The DS measuring mode is the basic state of SW 024, the power
LED and the DS LED are on. The SW 024 is in this mode if no AMA 310/UMS is connected to the
SW 024 or if the measuring instrument is switched off or if it is in another mode than active UMS
measurement.