Cisco Prisma II Installation Manual page 28

Chapter 1 Module Introduction
from node to hub or headend over optical fiber. Reverse path signals are typically
DOCSIS and DAVIC data.
At the node, one or two analog reverse path signals occupying the 5 - 85 MHz
reverse band spectrum are sampled by an analog-to-digital converter (ADC). A
high-speed serial data stream is constructed by scrambling and framing the data.
This data stream is carried optically over fiber to a remote hub or headend, where
the receiver detects the optical signal and converts it back to a serial electrical signal.
The data is unpacked and sent to a digital-to-analog converter (DAC), which
reconstructs the originally transmitted analog spectrum.
This system consists of an optical transmitter module installed in a GainMaker
Node, GS7000 Node, or Compact Node, and an optical receiver module installed in a
Prisma II or Prisma XD chassis at the hub or headend.
CAUTION:
The QEDR receiver is designed to work exclusively with EDR transmitters as
part of the Cisco EDR system. Results with other transmitters are not
guaranteed. Do not install Cisco EDR transmitters in any daisy chain with one
or more Cisco QEDR receivers.
Receiver Description
The receiver module contains four separate optoelectronic receiver circuits. Optical
input is through an OPM connector mounted on the front of the module. The RF
output is through two connectors on the rear of the module.
Each RF output can be attenuated by as much as 10 dB, relative to no attenuation, in
0.5 dB increments. The actual RF output levels of the receiver, attenuated by 20 dB,
can be monitored at a selectable test point on the front panel.
The receiver supports 2.5 GHz (1:1) and 5 GHz (2:1) configurations in an XD form
factor for both Prisma II (using Host Module) and Prisma XD Chassis. The OPM
optical input uses a dual LC/PC connector and supports all standard reverse
bandwidths: 40, 42, 55, 65, and 85 MHz.
The receiver can be operated in any of the following operating modes:
1:1 Input (2.5 GHz), One RF Output, One OPM

1:1 Input (2.5 GHz), One RF Output, Two OPMs

1:1 Input (2.5 GHz), Two RF Outputs, One OPM

1:1 Input (2.5 GHz), Two RF Output, Two OPMs

2:1 Input (5 GHz), One RF Output, One OPM

2:1 Input (5 GHz), One RF Output, Two OPMs

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