VIAVI SCU-1800 Sweep Control Unit for Headend/Hub CATV Forward and Return Sweep

1RU headend/hub sweep control unit with forward sweep to 1,218 MHz and return sweep to 204 MHz on up to 16 ports.

Output Transmit Port 1: 1 F-Type Connector
Output port impedance: 75 Ω
Input ports: 16 (F-type connector) with activity indicator
Input port impedance: 75 Ω

Datasheet

Overview

The VIAVI SCU-1800 is a 1RU rack-mounted Sweep Control Unit for cable headend and hub sites. It works with the OneExpert CATV ONX-630 field meter and provides non-interfering downstream sweep to 1.218 GHz and upstream sweep to 204 MHz on up to 16 ports, supporting DOCSIS 3.1 network frequency plans.

The ONX/SCU system is compatible with existing VIAVI sweep equipment, including SDA-55xx rack-mounted sweep gear and DSAM meters, so operators can introduce it alongside their current field instruments and move to the newer platform gradually.

With 16 switchable return sweep ports in one rack unit, less return-path combining is needed, which improves noise performance and lets several sweep receivers be consolidated into one unit. A single SCU-1800 needs only one telemetry signal, where several SDA units each needed their own, so less spectrum goes to telemetry.

The unit can be configured remotely or locally, and its interface is reached through a web browser over Ethernet, the internet or an intranet. Improved pulse generation gives a clean RF sweep signal with narrow pulses that can be placed between carriers.

Key Features

DOCSIS 3.1 frequency range – 1,218 MHz forward, 204 MHz reverse
1 RU and up to 16 switchable return sweep ports per unit
Configuration interface is accessible via Ethernet/Internet/Intranet and browser
Remotely and locally configurable
Compatible with existing VIAVI sweep equipment (SDA-55xx, DSAM)
Up to 500 sweep points in a user-defined sweep plan
Narrow sweep pulses enabling insertion between carriers
Single telemetry signal replaces separate telemetry for multiple SDAs

Specifications

Ports

Output Transmit Port 1	1 F-Type Connector
Output port impedance	75 Ω
Input ports	16 (F-type connector) with activity indicator
Input port impedance	75 Ω
Port-to-port isolation	>65 dB

Telemetry

Frequency Range	42 to 1,218 MHz
Frequency Resolution	10 kHz
Modulation	±100 kHz deviation; 65 kbps
Output Level	+20 to +50 dBmV, 1 dB resolution, 0.5 dB accuracy typical, 1 dB accuracy over temp
Spectral Purity	50 dBc harmonics and spurious Recommend 1 MHz space from SC QAM edge

Forward Sweep

Outputs	1 Transmit port
Sweep points	Up to 500 sweep points User defined sweep plan can utilize injected sweep pulses and/or field instrument reference of active carriers
Supported sweep plan active carrier types	Analog (NTSC, PALB, PAL GH, PAL I, PAL DK), Digital (6 or 8MHz), OFDM (24-192MHz) For reference and measurement by the field instrument
Compatibility	ONX-630, DSAM-6300 and SDA-5000 in SDA Sweep Mode
Compatibility range, ONX-630 ONX-630	model/diplexer dependent 50-1218MHz
Compatibility range, DSAM-6300 DSAM-6300	50-1000MHz
Compatibility range, SDA-5000 SDA-5000	42-1000MHz

Sweep Pulse

Frequency Range	42 to 1,218 MHz
Bandwidth	<5 kHz @ 3dB BW; <50 kHz @ 50 dB BW
Frequency Resolution	10 kHz
Level	+20 to +50 dBmV, 1 dB resolution, 0.5 dB accuracy typical, 1 dB accuracy over temp
Spectral Purity	50 dBc harmonics and spurious Recommend 1 MHz space from SC QAM edge

Reverse Sweep

Inputs	16 isolated inputs. Port 1 is standard on all units. Ports 2-16 are optionally enabled and are Auto-Scan for all 16 ports.
Frequency Range	5 to 204 MHz
Compatibility	Compatible with ONX-630 and DSAM-6300
ONX-630 single port mode ONX-630	Diplex dependent 4-42, 4-65, 4-85, 4-204 MHz
ONX-630 dual port sweep ONX-630	Port 2, 4-204 MHz
DSAM-6300 DSAM-6300	Model/Diplexer limited, 4-42 MHz, 4-65 MHz, 4-85 MHz
Recommended input level	0 dBmV
Input range and accuracy	± 20 dBmV allowable input range; ± 0.75 dB typical; ± 2 dB over temp
Minimum Signal-to-Noise Ratio	20 dB Signal-to-noise ratio required on received reverse telemetry from field meters

General

Enclosure	19-inch (48.3 cm) 1-RU rack mount
Width	19 Inches (48.3 cm)
Depth	14.6 Inches (37.1 cm)
Height	1 RU, 1.74 Inches (4.4 cm)
Weight	7.85 pounds (3.56 kg)
Power	Dual –48 V DC (–46 to 50 V DC) AC adapter included
Display	2x16 character backlit
Ethernet	10/100 Mbps
USB	1 USB 2.0
Data storage	1 GB flash memory

Environmental

Use	For indoor use
Operating temperature	5 to 45°C
Storage temperature	−20 to 60°C
Drop and Vibration	Bench Handling - MIL-STD-810F
Humidity	10 – 90% RH non-condensing
RF immunity	8.5 V/m
Maximum altitude	4000 m (13,123 ft)
Pollution	2°

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Applications

Headend and hub forward path sweep
Return path sweep up to 204 MHz
DOCSIS 3.1 HFC network maintenance
Consolidation of rack-mounted sweep receivers
Migration from SDA-5500/SDA-5510 sweep systems

Included

AC adapter

Options & Accessories

Option	Description
SCU-1800-FWD-REV-1P	SCU-1800, 1.218 GHz Forward and Single User 204 MHz Reverse, 1 Active Reverse port — FWD & REV package
SCU-1800-FWD-REV-16P	SCU-1800, 1.218 GHz Forward and Single User 204 MHz Reverse, 16 Active Reverse ports — FWD & REV package
SCU-1800-REV-MU-1P	SCU-1800, 204 MHz Reverse, Multi-User, 1 port — Reverse Only package
SCU-1800-REV-MU-16P	SCU-1800, 204 MHz Reverse, Multi-User, 16 port — Reverse Only package