Alcatel-Lucent 7330 - Typical Optical Fiber Outside Plant Architecture; Distance and Performance Considerations; Typical Outside Plant Arrangement

2 — Part numbers, ordering, and deployment configuration overview
Alcatel-Lucent 7302 ISAM | 7330 ISAM FTTN | 7360 ISAM FX ONT R04.06.02 November 2013 2-43
3FE 55873 AAAA TCZZA Edition 01
ONT Product Information Guide
Typical optical fiber outside plant architecture
The outside plant consists of optical fiber cables, splicing enclosures, fiber
distribution cabinets or enclosures, and drop boxes. The outside plant can be
implemented using different architectures. The specific architecture can greatly
affect the cost of deployment.
The key factors that significantly influence the cost of the architecture include:
• plant type, such as aerial or buried
• home density
• splitter location
• expected penetration rates
A typical system uses two levels of distribution and splitting. A primary flexibility
point provides rough granularity for splitting the fiber, followed by a final drop or
secondary flexibility point where the final split and drops to the ONTs at the
premises are implemented. This basic architecture is cost-effective while also
retaining flexibility for the future. Figure 2-2 shows a typical outside plant
arrangement.
Figure 2-2 Typical outside plant arrangement
Distance and performance considerations
System performance varies in proportion to the amount of data that is transmitted to
and from the subscriber location.
The system is designed to support a long reach from the CO to the subscriber
location. The maximum reach capacity is typically 18.6 mi (30 km) for GPON LT
cards. The optical link budget is defined by both loss and bandwidth characteristics.
The loss characteristic is determined by the difference between the optical
transmitter and optical receiver for each direction, and is typically 28 dB. The
bandwidth characteristic is determined by the maximum link distance parameter of
each OLT and ONT transmitter specification, and is limited by the lower of the
upstream and downstream values.
21218
Splitter
cabinet
Distribution
cabinet
SS SS
Customer premises
Central office
ONT
Fiber
36> fiber cable
(feeder)
32> fiber cables
(PON distribution)
PON distribution cables
OLT
FTP
Splice CaseS
Optical Line TerminationOLT
Legend: