Transmitter Operation - Cisco Prisma II EDR Installation Manual

Chapter 1 Module Introduction
Key operating parameters of the receiver can be controlled and monitored by an
ICIM2 or ICIM2-XD, LCI software, ROSA software, CLI commands, or the ICIM
Web Interface. In addition, some transmitter information can be monitored via the
receiver.
Note: Node data is only available for GS7000 Nodes that have a transponder-less
LCM installed and an interface cable installed between transmitter and LCM. For
details, see the Cisco Enhanced Digital Return (EDR) C2185 Transmitter for Compact
Segmentable Nodes A9020x Installation and Operation Guide, part number 62-7023683-01
. Some transmitter data is available in all cases.

Transmitter Operation

At the transmit end of the system, reverse path RF input signals from each Prisma II
Transmitter port are routed to an EDR 2:1 Transmitter Module in the Prisma II
chassis. The transmitter module converts each signal to a baseband digital data
stream and combines the signals 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 EDR receiver.
The data stream is carried optically over fiber, via an SFP type OPM module, to a
remote headend or hub location where the optical signal is detected and converted
back to a serial electrical signal. The data is then descrambled and deframed, and is
then switched to a digital-to-analog converter (DAC), where the analog spectrum
that was sampled at the transmit side is reconstructed. The baseband data stream is
converted to an optical signal for transmission back to the headend or hub.
The following block diagram shows the transmitter module's internal components.
The EDR Transmitter module uses the same style housing as Prisma II optical
receivers and transmitters, except that it uses a double-wide module housing. This
housing occupies two adjacent slots in the Prisma II or Prisma XD chassis.
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