DR3121
Dual Return Channel Digital Receiver
(5-50 MHz Passband) |
The DR3121 Dual Return Channel Digital Receiver utilizes state-of-the-art
technology for digital return path applications, and its capabilities allow deployment
of compact and robust high-speed digital broadband systems. The advanced design provides
simultaneous conversion of digital return path traffic from two RF return segments to two
discrete RF output ports. Used in combination with DT4200 series or DT5200 series Digital
Transceivers in optical nodes, or DT3500 series Digital Transmitters, the DR3121 allows
quick and cost effective doubling of the amount of return bandwidth available from any node
in the network. These dual-segment digital return receiver modules are primarily used in
traditional HFC systems, where larger node sizes are the norm. Two dual-channel transceivers,
when used in a fully segmented node in combination with DWDM techniques, and two DR3121
dual-channel digital return path receivers can provide four discrete return paths from a
single node location over a single return fiber.
The DR3121 receiver interfaces with the BP-3104C-AS Optical Receiver Back
Plate, enabling the equivalent of up to eight digital receivers to be installed in four
adjacent module slots of Aurora’s 3RU CH3000 chassis. A total 24 receivers (and three
associated BP-3104C back plates), with provision for redundant chassis power supplies,
can therefore be accommodated in each chassis.
Each DR3121 terminates one return path optical fiber through an SC/APC-type
optical connector. Data extracted from the optical link is converted through high-speed
DACs to two analog RF signal outputs. Additionally, messaging traffic from the node-mounted
transceiver and the receiver is multiplexed with messaging signals received from the
adjacent receiver module and forwarded to the next receiver module in the chain.
Features
• Dual D-A conversion provides discrete RF signals from two return
segments per optical input
• High RF output (–33 dBmV/Hz typical)
• Superior noise performance
• RF output level independent of optical input power provides ouput level
stability in alternate routing applications
• Front access –20dB test points for each return path
• Hot plug in/out
• Local and remote status monitoring
• Occupies one full-depth slot
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