Cisco GS7000, Installation And Operation Manual

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Equipment Description
11
Module Description
Reverse
Configuration
(cont'd)
The 4x4 Reverse Configuration Module with auxiliary reverse RF
injection
routes reverse inputs from Port 1 to Transmitter 1, from Port
2/3 to Transmitter 2, from Port 4 to Transmitter 3, and from Port 5/6
to Transmitter 4. An RF signal from an external source can optionally
be injected and coupled with reverse RF inputs from Ports 3/6 and
routed to Transmitter 1. (Note that this module is typically installed
when using EDR multiplexing digital reverse modules. Since the
digital reverse module occupies the physical space that transmitters 3
and 4 normally occupy in the node base, this reverse configuration
module is typically used with a 6-port optical interface board.)
Optical Receiver This module converts an optical signal from the headend into a
forward path RF signal. An SC/APC fiber connector is standard.
Optical power, test points, and status LEDs are provided.
Optical
Transmitter This module converts reverse path RF signals from the network into
an optical signal. An SC/APC fiber connector is standard. Multiple
transmitter options are available such as uncooled DFB, 1550 ITU, and
EDR. EDR uses the included LC/APC connector that jumps over to an
SC/APC bulkhead. Optical power, test points, and status LEDs are
provided.
Optical
Amplifier
(EDFA) Erbium-doped fiber amplifier modules are available in two categories:
broadcast and narrowcast (gain-flattened). EDFAs are available in 17
dBm, 20 dBm, and 22 dBm for broadcast constant output power. A 17
dBm, 20 dBm and 21 dBm narrowcast constant gain EDFA version is
available to fit any architecture for requirements like DWDM
narrowcasting. EDFA modules are single-wide, single-output devices.
The modules mount in receiver or transmitter slots on the optical
interface board in the node lid using a reversible pin adapter. The
EDFA is monitored and controlled by the Status Monitor/Local
Control Module in the node.
Optical Switch The optical switch module is used for switching the input of an EDFA
module from a primary signal to a backup or secondary signal. The
module mounts in receiver or transmitter slots on the optical interface
board in the node lid using a reversible pin adapter. The switch is
monitored and controlled by the Status Monitor/Local Control
Module in the node.