return path
■
Input line rate: 2.125 Gbps
■
Two analog output channels, 5-48 MHz each
■
–31 dBmV/Hz RF output
■
–20 dB RF test point relative to the output
(one for each output)
■
Status monitoring via NETWatch™ of optical power and
optical power alarm
Advantages
The use of digital return path in a network offers the operator
several advantages for expanding network services and increasing
system reliability:
■
The performance of a digital return transmission system is
independent of link loss over the operating range of the receiver.
This allows digital links to have outstanding performance over
very long links.
■
Offers increased system reliability and reduced operation costs
from increased network segmentation
Applications
■
High-speed internet communications
■
Pay-per-view
■
Video-on-demand
■
Telephony
■
Security
■
Alternative access
■
Local origination
■
Direct customer feeds
Digital Return Path Receiver
HL 2000 Series
RDR 2000
Product Description
Harmonic’s RDR2000 is a return digital receiver for the HTR2000D
transceiver chassis. The receiver takes an optical data stream at
2.125 Gbps. The input is demultiplexed into its two component
data streams. These are converted back to analog waveforms by
two digital to analog (D/A) converters.
The RDR2000 uses state-of-the-art technologies to provide high-
speed capabilities, flexible configurability, and high input responsivity.
The RF output bandwidth is 5-48 MHz and is DOCSIS-compliant.
The RDR2000 is used in conjunction with the Harmonic NDT
family of digital transmitters.
■
Plug-in card for the HTR2000D (or above) platform
■
PIN diode receiver with –20 dBm (optical) receiver sensitivity.
Demux Analog
Signal
Conditioning
Optical
Power Alarm
Circuit
Optical Power Alarm
Optical Power
Optical Power Alarm LED
(Red if Opt. Pwr < -22 dBm)
Optical Input
Optical Power TP
Optical Alarm
Threshold Adjustment
Reconst.
Filter
-20-dB RF TP
D/A
Reconst.
Filter
RF Output
RF Output
-20-dB RF TP
D/A
Limiting
Amp.
Status
Monitoring
Interface
Standard Configuration
Optical Input
Number of Fiber Optic Inputs: 1
Maximum Input: 0 dBm
Minimum Input: –20 dBm
Wavelength: 1250 to 1600 nm
Input Line Rate: 2.125 Gbps
RF Output
Number of Analog Outputs: 2
Passband: 5-48 MHz
Output RF level1: –31 dBmV/Hz
Impedance: 75 Ω
Flatness2:
10-48 MHz: ±0.5 dB or less
Optical Interface
Connector Type:
RDR2000-AS: SC/APC
RDR2000-US: SC/UPC
User Interface
RF test point connectors: Type “F”
Total number of RF test point connections: 2 accessible
from the front
RF output test point: –20 ±1.0 dB
Optical level test point: 1 V/mW
DC power: Green LED
Optical power alarm: Red LED
Element Monitoring System - NETWatch™/HEM
Optical power alarm — monitor
Optical power — monitor
Power Requirements
Maximum power: 12.5 W
Environmental
Operating temperature range: –20° to +65°C
Storage temperature range: –40° to +85°C
Physical
Dimensions: 12.5”L x 0.8”W x 4.1”H
Mounting: Plug-in card for the HTR2000D (or above) platform
Notes:
1. For a digitized Gaussian noise signal at 0 to -20 dBm of received average optical power.
2. When used in conjunction with the Harmonic family of digital transmitters.
RDR 2000
Specifications
Copyright 2000 Harmonic Inc. Harmonic continues to improve and enhance all
product designs. Specifications are subject to change without notice. Harmonic
and logo design, eXchange, MAXLink, METROLink, NETWatch, PWRBlazer,
TRANsend, and “Redefining the Network” are trademarks of Harmonic Inc.
YAGLink and PWRLink are registered trademarks of Harmonic Inc. All other
names are trademarks or registered trademarks of their respective owners. 2203-01 1K 02/00
Harmonic Inc.
549 Baltic Way
Sunnyvale, CA 94089
Tel. 408-542-2500
Tel. 800-730-4099
Fax 408-542-2510
