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Geng Started Guide - 22114998
Copyright © 2016 VIAVI. All rights reserved.
SCU-1800 UNPACKING AND SETUP
1. Remove SCU-1800 from box and carefully
remove all packaging material.
2.
Mount SCU-1800 chassis in rack using the
four holes provided on the front panel.
3. Connect grounding strap of chassis to Earth
Grounding terminaon screws on the rear
panel of the SCU-1800.
4. Remove the protecve cover over the DC
power lugs on the rear panel of the
SCU-1800.
a. If using an exisng -48VDC power
supply, double-check that power is
turned off. Connect the -48V and RTN
leads from the power supply to the
appropriate power lugs on the rear
panel of the SCU-1800.
b. If using the VIAVI-supplied oponal AC
power adapter, connect the adapter
terminals to the appropriate SCU-1800
power lugs. Black wire goes to -48VDC
lug, white wire goes to RTN lug.
5. Replace the clear plasc cover over the
power lugs.
6.
Connect jumpers from the RF source to the
appropriate receive ports on the rear of the
SCU-1800 as shown in conection diagram.
Connect the RF OUT port as shown
Port 1 on the receive port is the only acve
reverse sweep receive port on the
SCU-1800-FWD-REV-1P and
SCU-1800-MU-REV-1P.
Ports 1 through 16 are all acve reverse
sweep ports on the SCU-1800-FWD-REV-16
and the SCU-1800- MU-REV-16P.
The reverse feeds for reverse sweeping
should be connected appropriately to one of
the receive ports.
Receive Ports
The return levels should ideally be received
at 0dBmV for opmal performance but can
work over the range of +/- 10dBmV
depending on the overall combined noise
floor. There must be > 20dB SNR on the
return telemetry to be properly received.
NOTE:
The SCU-1800-FWD-REV-1P and SCU-1800FWD-REV-16P do not connect the same as
the SDA- 5500 for forward sweep. The
forward levels are not directly measured by
the SCU-1800. The stability and accuracy of
the transmier alleviated the need to be
locally measured.
CAUTION:
DO NOT connect the forward path signals to
any of the 16 receive ports.
7. Connect Ethernet feed to RJ45 connector
socket on the rear of the SCU-1800.
8. Apply power to the SCU-1800. Once power is
applied to the SCU-1800 the LCD will display:
LCD Display Screen and Keypad
LCD Display at Start-Up
NOTE:
The actual IP address that appears may be
different than shown below.
9. Aer approximately 20 seconds the LCD will
display the IP address of the unit:
IP Address of SCU-1800
The following figure explains what each line
and/or symbol on the LCD is showing.
ExplanaƟon of LCD Fields
There are five different fields that may be
viewed on the LCD by using either the up or
down arrow keys to scroll. Three may be
edited, the other two which are for
informaonal purposes only.
Shown below are the three fields which may
be edited (all field values may be different
from what is shown).
IP Address of the SCU-1800
Subnet Mask of the SCU-1800
Default Gateway of the SCU-1800
The following figures show the remaining two
fields that are informaonal only and cannot
be edited from the SCU-1800 front panel. The
horizontal line immediately below the down
arrow is not present in these two fields
indicang that they cannot be edited via the
front panel.
Physical (MAC) Address of the SCU-1800 Ethernet Adapter
CAUTION:
Before seng any IP address informaon in
the SCU-1800, please confirm with your
network administrator that the IP addresses
you have are valid for your network
configuraon and will not cause any conflicts
on your local area network.
10. To set the IP address of the SCU-1800, use
the up or down arrow keys to scroll to the IP
address field on the LCD and press the
"Enter" buon. The horizontal line that
indicates that this is a field that may be
edited drops to the boom of the first digit in
the IP address field and becomes a cursor
indicang that the SCU is now in "edit
mode".
IP Address in Edit Mode
SCU-1800 Getting Started Guide
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SYSTEM REQUIREMENTS
•
SCU-1800 Chassis
• 48V DC Power Supply (+/- 5%, 1A max
current)
• 10/100 BaseT Ethernet connecon with stac
IP
CAUTION:
Be sure that power is off on the -48V DC
power source before connecng or
disconnecng power leads to the SCU-1800.
GETTING TO KNOW THE SCU-1800
The front panel consists of:
The power buon
The 4 cursor or arrow keys
The "Enter" or "Accept" buon
The "Exit or "Cancel" buon
The informaon LCD
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SETUP OF FORWARD SWEEP AND TELEMETRY ON
THE SCU-1800-FWD-REV-1P AND
SCU-1800-FWD-REV-16P
The Transmit mode of the SCU will only work
with DSAM-6300, ONX-630’s or SDA-5000 field
units that are in SDA compable mode.
Forward Telemetry Frequency must be in a vacant
spectrum and at least 500 kHz from any other
carrier. It must also be within the bandwidth of
the downstream spectrum. This is an FSK carrier
and approximately 500 kHz wide. The factory
default is 51 MHz for forward Sweep (like the
SDA-5500 transmier,) 52 MHz on reverse mul
user sweep receiver (like SDA-5510), and 53 MHz
on the PathTrak™ HSM (a common Viavi element
also typically located with the SCU-1800 and SDA
sweep gear).
NOTE:
If diplex filters in the acves have a sharp
rolloff, it is advisable to move the telemetry
to a frequency that is more reliable. The
locaon and level of the telemetry may cause
its second harmonic to interfere with exisng
channels if not opmally adjusted.
Forward Telemetry Level determines the level of
the telemetry signal. This should be set 10 dB
below the video reference level. The telemetry
level is adjustable from 20 to 50 dBmV in 1 dB
increments. The max is 50 dBmV; Forward Sweep
Inseron Level is the level at which sweep
inseron points will be inserted; 50 dBmV is the
max.
Sweep points should be 14 to 16 dB below the
video reference level. Sweep points fall on the
video and/or audio frequency of unused channels
by default, but can be moved.
Inially set the Telemetry and Sweep Inseron
levels to the minimum of 20 dBmV each. Change
the sweep inseron level unl the sweep inseron
points are 14 to 16 dB below the closest visual
carrier. You can use a spectrum analyzer such as
the VSE-1100 or the ONX-630 to view this. Once
the sweep is set correctly, change the telemetry
level to 4 dB above the Sweep Inseron level.
Enable Reverse Sweep allows reverse sweep to
operate. If disabled, the forward sweep will be
faster.
SETUP OF REVERSE SWEEP ON THE
SCU-1800-FWD-REV-1P AND
SCU-1800-FWD-REV-16P
SCU-1800-REV-MU-1P AND
SCU-1800-REV-MU-16P
Reverse Telemetry Frequency is set up on the
SCU-1800 and not on the field unit.
NOTE:
Be sure to select a reliable frequency void of
interference in the most stable part of the
passband, not in the roll-off or below 15
MHz.
Reverse Channel Plans are built and/or edited for
the upstream direcon. The reverse channel plan
must be set-up on the unit that is to receive the
sweep points from the upstream receiver (either
the SCU-1800-FWD-REV-1P/16P or the
SCU-1800-REV-MU-1P/16P).
The reverse sweep plan will be communicated
automacally to the field units via the forward
telemetry.
SETUP OF FORWARD TELEMETRY ON THE
MULT-USER REVERSE SWEEP UNITS
SCU-1800-REV-MU-1P AND
SCU-1800-REV-MU-16P
The Mul User units only units ulize a forward
telemetry to communicate to the field
instruments to transmit sweep results and to
instruct the field unit where and when to
transmit sweep pulses.
Follow the same guidelines for forward
telemetry setup as described in the forward
sweep setup.
SCU-1800 UNPACKING AND SETUP (cont’d)
11. Use the up or down arrow keys to set the
first number of the first IP address octet
(range blank thru 2). If the first octet is less
than 100, scroll unl the digit is blank. Once
the first number is set, use the right arrow
key to move the cursor to the second
number of the first IP address octet.
IP Address in Edit Mode (1st Octet)
12. Use the up or down arrow keys to set this
number to the proper value (range 0 thru
9). Once this number is set, use the right
arrow to move the cursor to the next digit.
13. Follow the same process unl the correct IP
address shows on the display and then
press "Enter". This will save the address
informaon and place the unit back in
normal operaon mode.
14. Now, press the down arrow to go to the
subnet mask field and repeat the process
used to set the IP address. When the
subnet mask is correct, press the down
arrow and repeat once more for the default
gateway.
15. There is no need to reboot the SCU-1800.
Once you press the "Enter" buon at the
end of each field, the address is set and
applied. When all the addresses are set,
verify network connecvity from a PC to
the SCU-1800.
16. Using a PC connected to the same network,
open up a web browser and type in the IP
address of the SCU-1800 (e.g.
hp://10.11.15.55). You may also access it
by adding port 8000 to the address (e.g.
hp://10.11.15.55:8000).
The SCU-1800 is login protected. The inial
login informaon is:
user name: scuadmin
password: scuadmin
RF InputsEthernet-48V and Return
Typical SCU-1800 connection diagram
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