Viavi SCU-1800 User manual
Updated Last: December 2020
SCU-1800
User Guide and
Overview
2© 2020 Viavi Solutions Inc.www.viavisolutions.com
Table of Contents
•SCU-1800 Introduction
•SCU-1800 Configuration Overview
•Configuring the Static IPAddress
•Logging into the SCU-1800
•Navigating the SCU Configuration Menus Page
•Sweep Settings
•General Settings
•Reverse Test Point Compensation
•Firmware
•Options
•Changing Username and Password
•About
•Overview of Forward and Reverse Sweep Menus
•Forward Sweep Menu Overview
•Forward Sweep Menu Buttons
•Reverse Sweep Menu Overview
•Reverse Sweep Menu Buttons
•Setup a Forward Sweep Plan
•Completely Manual Forward Sweep Setup
•Use ONX to Build Forward Sweep Channels
•Creating a Reverse Sweep Plan
•New Reverse Sweep Plan
•Activating a Sweep Plan
•Selecting a Forward Sweep Plan
•Selecting a Reverse Sweep Plan
•Activating and Deactivating Sweep
4© 2020 Viavi Solutions Inc.www.viavisolutions.com
SCU-1800 High Level Overview •Available in two mode configurations
1. Forward Sweep + Single User Reverse Sweep
2. Multiple User Reverse Sweep Only
•Can be configured remotely via Ethernet
•HTTP or HTTPS supported
•Forward channel plans can be learned on the
ONX and uploaded to the SCU
•Recommended if using any active channels as
sweep points
•Backward compatible with DSAM-6300
•Optional to use all 16 reverse input ports
•Minimize additional RF combining
•SCU sweep points are spurious free with a
narrow bandwidth
•Provides -50dBc adjacent channel specs
Table of Contents
5© 2020 Viavi Solutions Inc.www.viavisolutions.com
SCU 1800 Headend RF Connection Diagram
Optical
Transmitters
Optical
Transmitters
Optical
Transmitters
Optical
Receivers
Optical
Receivers
Optical
Receivers
SCU 1800
RF Out
RF Inputs
Note: that the forward carriers are not fed back into the SCU1800
Nodes
Forward Combiners and splitters
Table of Contents
6© 2020 Viavi Solutions Inc.www.viavisolutions.com
SCU-1800 Benefits
Space conserving 1RU sweep control unit with
16 switchable return sweep ports
•Less combining required
•Improved noise performance
The headend/hub SCU-1800 Sweep Control Unit
provides non-interfering downstream sweep to
1.218 GHz and upstream sweep to 204 MHz on
up to 16 ports.
The sweep is remotely configurable via Ethernet
and browser, and a sweep plan can be built from
imported OneExpert CATV channel plan
SDA-5510 REV combiner
Table of Contents
8© 2020 Viavi Solutions Inc.www.viavisolutions.com
Configuring the Static IP Address
•Using the front panel of the SCU-1800 press the down arrow to view and set the static IP address
•Once IP address is visible press the “Checkmark” button to enter the IP edit mode on the font panel
•Using the directional arrows will allow users to configure the proper Static IP address for this device
-Up / Down –Changes the digit value (0 –9)
-Left / Right –Moves the curser to the next digit
-Press the “Checkmark” button to set the IP address
•Press the down arrow to enter the network’s Netmask and Gateway addresses
Table of Content
Table of Contents
9© 2020 Viavi Solutions Inc.www.viavisolutions.com
Logging into the SCU-1800
•Using a web browser navigate to the IP address on the front of the SCU-1800 that will be configured
•When prompted, enter the SCU-1800 user name and password
-Default Username is “scuadmin” and the default password is “scuadmin”
Table of Contents
10© 2020 Viavi Solutions Inc.www.viavisolutions.com
Navigating the SCU Configuration Menus Page
•Sweep Settings –Telemetry and Transmit Level settings
•General Settings –Units, Device Name, HTTPS, and Mode Selection
•Test Point Compensation –Configure reverse test point compensation per port
•Firmware –View and update firmware versions
•Options –View and install software options
•Login Settings –Change login username and password
•About –Serial number and calibration information
The SCU Configurations are accessible via the “Settings” menu from the top row of buttons
Table of Contents
11© 2020 Viavi Solutions Inc.www.viavisolutions.com
Sweep Settings
•Forward Telemetry Frequency –Sets the downstream telemetry signal frequency –this will need to be set in the
field sweep unit (ONX or DSAM) to be able to communicate with the SCU-1800
•Independently set the transmit level of the telemetry signal and transmit level of sweep pulses –if the telemetry
signal is set in the diplex rolloff then the transmit level may need to be increased to overcome the attenuation of
the system diplexers
•Reverse Telemetry Frequency –Sets the upstream telemetry signal frequency –this will be communicated to the
field sweep unit (ONX or DSAM) in the forward telemetry to enable bi-directional communication
•Rapid Reverse Sweep Capable –If enabled will instruct capable ONXs to use the Rapid Reverse Sweep method
•Automatically start sweep at power on –If enabled will activate sweep based on previously set configuraitons
when power is restored to the SCU-1800
Table of Contents
12© 2020 Viavi Solutions Inc.www.viavisolutions.com
General Settings
•Signal Level Units –Change which units are used for displaying signal levels –dBmV, dBµV, dBm
•Device Name – The default device name is “SCU-1800” this can be changed to better identify specific SCUs
•HTTPS Enabled –If enabled the web interface to the SCU-1800 will utilize secure sockets to communicate to
further enhance network security
•Demo Mode –Not available on all SCU-1800 models –Allows the SCU operation to be changed between
“Forward Sweep” or “Multi User Reverse Sweep” modes
Table of Contents
13© 2020 Viavi Solutions Inc.www.viavisolutions.com
Reverse Test Point Compensation
•Test Point Compensation mathematically adjusts the measured
reverse sweep signals to compensate for additional loss that may
be desired to compensate for on the field unit sweep results
•The SCU allows all 16 ports to be independently compensated
•Apply TPC to Reverse Telemetry Level
-If checked, the SCU will apply the port specific test point
compensation value to the reverse telemetry signal and reverse
sweep points before sending that information back to the field
instrument
-If the box is not checked then only the reverse sweep points
received at the SCU will have reverse TPC applied and the
telemetry signal will not be affected by the configured TPC value
Table of Contents
14© 2020 Viavi Solutions Inc.www.viavisolutions.com
Firmware
•The Current firmware version installed is shown under the “Firmware Package Version”
•To update firmware on the SCU press the “Choose File” button, find the desired SCU
firmware upgrade package, then press the “Upgrade Firmware” button
Table of Contents
16© 2020 Viavi Solutions Inc.www.viavisolutions.com
Changing Username and Password
1. The default username and password can be reset on the SCU-1800 to a customized field
2. Usernames and Passwords must be 6 characters or longer of any combination of letters, numbers, and
special characters
3. If the new login information is lost, or forgotten, users can reset the SCU’s default login using the LCD
panel
12
3
Table of Contents
19© 2020 Viavi Solutions Inc.www.viavisolutions.com
Forward Sweep Menu Overview
•Once in the SCU-1800 press the Forward Sweep Tab
•The big window shows all previously configured
forward sweep plans
-Currently active plan will have a check mark next
to it under the Active column
•Plans in the list can be searched by Name or number
of Sweep Points
•Columns are sortable by clicking on them
Table of Contents
20© 2020 Viavi Solutions Inc.www.viavisolutions.com
Forward Sweep Menu Buttons
Once in the SCU-1800 press the “Forward Sweep” Menu:
•New - To create a new sweep plan (reviewed in detail
below)
•Copy –Will duplicate the highlighted plan and add
“(copy)” to the end of the original plan’s name
•Edit –Allows editing the plan name as well as the sweep
points of the highlighted plan
•Delete – Will delete the highlighted plan from the SCU’s
list of plans
•Import –Allows sweep plans to be imported from
previously exported SCU sweep plans
•Activate Forward Plan –Will change the highlighted plan
to the active forward sweep plan that the SCU will use
Table of Contents
Other manuals for SCU-1800
1
Table of contents
