Cisco Prisma II Reverse Optical Receivers Data Sheet

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Data Sheet

Cisco Prisma II Quad Optical Input Enhanced
Digital Return (EDR) Receiver for Compact
Segmentable Nodes

The Cisco

Quad Optical Input Enhanced Digital Return (Q-EDR) 85 Receiver

expands the Cisco PII EDR Receiver product line. This new Q-EDR receiver offers the
superior performance of our dual EDR receiver and enables doubling the PII receiver
density in digital return systems.

The Cisco EDR 85 System includes the EDR Compact Segmentable Node A9020x Transmitter modules that install

in the node and companion Prisma

high-density (HD) EDR PRX85 Dual or Quad input receiver modules.

(See Figure 1.) Both the dual and quad optical input EDR receivers install in a Prisma II or Prisma II XD chassis at

the headend or hub. The Q-EDR receiver uses the same Small Form-Factor Pluggable (SFP) optical pluggable

modules (OPMs) as the dual EDR receivers. The Cisco EDR 85 System operates over the 5

–85 MHz range and

supports all standard reverse frequency bandwidths at 40, 42, 55, 65, and 85 MHz.

At the transmit (node) end of the system, the reverse path RF input signals from each node port are routed to an

EDR 2:1 transmitter module in the node mainboard. The transmitter module converts each signal to a baseband

digital data stream and combines them into a serial data stream using time-division multiplexing (TDM). The

baseband data stream is then converted to an optical signal for transmission to the headend or hub. The 2:1

transmitter module is available for the Cisco Compact Segmentable Node types A90200 and A90201. The

transmitter OPMs are available in either coarse wavelength-division multiplexing (CWDM) 1270

–1610 nm

wavelengths or dense wavelength-division multiplexing (DWDM) ITU channels 17

–61.

At the receive end, typically in a large hub or headend, the EDR receiver module receives the optical signal and

performs conversion back to the baseband data stream. The resulting data streams are converted back to analog

reverse path signals for routing to termination equipment. With the Q-EDR receiver, up to 4 optical inputs can be

combined and routed to the 2 RF outputs of the module in a variety of ways. For example, all 4 optical inputs can

be combined onto a single RF output or reconfigured with a simple software command to be split between the 2 RF

outputs. This software-controlled reconfiguration capability of the Q-EDR Rx allows for maximum network flexibility

with minimal hardware investment. The receiver OPMs are available in Standard Range (SR) and Extended Range

(XR) configurations. Both configurations feature a dual LC/PC optical input connector that feeds two independent

reverse optical receivers, each with its own RF output port.

Both the dual and quad input EDR receiver modules (Figure 2) occupy one slot in a Cisco Prisma II XD chassis.

Two EDR HD receiver modules can be vertically stacked in an associated Prisma II host module that occupies a

single-wide slot in the Prisma II standard chassis. Up to 26 HD modules can operate in a standard 6RU chassis,

while up to 16 HD modules can operate in the Prisma II XD chassis. The ability to mix EDR receiver modules with

other Prisma II HD modules in the same chassis greatly enhances the flexibility of the platform.

The 56-connector version of the chassis is required to make use of both receivers in one chassis slot.