ADC OmniReach FDH 3000 - Manual (Page 8)

7/08
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102496AE
OmniReach
®
FTTX
Solutions
FDH
3000
OmniReach ® FTTX Solutions
Outdoor FDH 3000
8 w w w . a d c . c o m • + 1 - 9 5 2 - 9 3 8 - 8 0 8 0 • 1 - 8 0 0 - 3 6 6 - 3 8 9 1
Centralized Splitting
There are two main approaches to FTTX optical splitters: centralized and cascaded. ADC recommends
the centralized approach for several significant reasons.
The centralized splitter approach maximizes the highest efficiency of expensive OLT cards. Since each •
home in this approach is fiber-connected directly back to a central hub, all ports on the OLT card are
used and 100% efficiency is achieved.
Provides easy testing and troubleshooting access. It is very difficult to use an optical time-domain
•
reflectometer (OTDR) to test multiple splitters unless the network is built with each fiber characterized
to enable the OTDR to recognize each individual fiber run.
Minimizes signal loss by eliminating extra splices and/or connectors from the distribution network.
•
Each time an optical signal encounters a network component or connection, such as a splitter, it
suffers a certain degree of signal loss. Therefore, when splitters are cascaded together, loss will
occur at each device. The combined loss effect can reduce the distance a signal can travel, imposing
distance limitations on fiber runs.
Reducing the number of components in the network decreases the number of opportunities
•
for failure.
3
4
2
1
AT
SPLICE
POINT
SPLICE
POINT
DISTRIBUTION
CABLE
(~72 FIBERS)
DROP
CABLE
(TYP)
ONT (TYP)
SPLICE
POINT
FIBER
FRAME
SPLICE
POINT
1550
FEEDER
CABLE
(1-N FIBERS)
3
4
2
1
AT
4 1
AT
AT
1490
1310
FIBER
FRAME
FIBER
CROSS-CONNECT
WDM
VAM
MODULE
PACKET
OLT
VIDEO
OLT
CLASS
5
SWITCH
RF
CONTENT
SITE
INTERNET
1550
1310
1490
FDH
32
2
1
Splitter Chassis
1x32
Optical
Splitter
Feeder OSP
Cable from C/O
Optional
Splice
Tray
Optional
Splice
Tray
Factory Connectors
Splitter Module
Factory Terminated
Connectors on FDT
Distribution Cable
Distribution Cable
Splitter Connector
Parking Lot
Factory Connectors
Splitter Module
Inside the FDH
Schematic Diagram of PON Architecture - Central Office to Outside Plant