Cisco Model 6944 Four Port Optoelectronic Node 870 MHz with 42 54 MHz Split 数据表

 

 
 
 
 

The Model 6944 Node is Scientific-Atlanta’s latest generation 
870 MHz optical node platform.  This platform allows 
independent segmentation or redundancy for both the forward 
and reverse paths in a reliable, cost effective package. 
 
The forward path of the Model 6944 Node can be initially 
deployed as a broadcast 1310/1550 nm optical receiver with 
common services distributed to either four outputs (all high 
level) or six outputs (two high level and four lower level).  
Forward segmentation can be implemented via use of 
additional optical receivers, to provide unique broadcast 
services at each of the high level ports. 
 
The Model 6944 Node’s reverse path is equally flexible.  
Reverse traffic can be combined and routed to FP or DFB 
reverse transmitters, and redundant (back-up) transmitters 
may also be utilized.  The platform provides for reverse 
segmentation through the addition of transmitters.  Up to four 
transmitters - one per reverse input port – can be configured 
using the eight position optical interface board.  Where fiber counts are limited, the six-position optical interface 
module allows for space to add advanced Baseband Digital Reverse, reverse path segmentation technology using 
Scientific-Atlanta’s bdr™system.  The six-position optical interface board has two transmitter mounting positions. 
If the reverse path is not segmented, one position is used for the primary reverse transmitter and the other for an 
optional redundant transmitter.  For dual reverse segmentation, two transmitters are installed, each dedicated to 
reverse traffic from a pair of station reverse input ports. 
 
The Model 6944 Node RF launch amplifier module is common to all configurations from the most basic to a fully 
featured, forward and reverse segmented node.  The forward path of the RF launch amplifier includes four high level 
distribution outputs.  Utilizing a plug-in splitter, the outputs for ports one and six can be split and routed to ports two 
and five respectively, thereby providing six output ports, two high level and four lower level.  The reverse path in the 
RF launch amplifier module is passive.  Each of the four reverse path inputs includes a plug-in location for an optional 
three state reverse switch. 
 
There are three forward configuration modules for the Model 6944 Node, each specific to the level of forward path 
segmentation desired.  When the forward path of the node is not segmented, a standard forward configuration module 
is utilized, and the four station output ports are fed from a common receiver.  A dual forward segmentation module is 
utilized when two receivers are installed - with each providing unique broadcast services to a pair of station output 
ports.  A quad forward segmentation module is utilized when four receivers are installed – with each providing unique 
broadcast services to one of four dedicated station output ports.