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Applications
Issue 3 June 2001
2-41
Point-to-Point Topologies 2
OC-3 Point-to-Point (Folded Ring) 2
The point-to-point application is the traditional means of providing optical transport
in the loop feeder. In situations where new demand is isolated to a small number
of carrier-serving areas along a given feeder route, maximum simplicity and cost
efficiency make point-to-point configurations a good choice. The point-to-point
application has the added benefit of consistency with existing operations systems
and operations practices.
The point-to-point applications provide an ideal platform from which the loop
network can evolve in step with changing service needs. Evolution to multispan
applications like add/drop, hubbing, and path switched rings offers planning
flexibility and network equipment savings. Starting at the OC-3 rate, the access
network can be sized to maximize utilization with an easy upgrade to higher
capacities like OC-12.
A single 8.5-inch shelf provides OC-3 optical transport for a mix of DS1 and DS3
traffic. Equipped in this manner, the DDM-2000 OC-3 Multiplexer is a low-cost,
full-function terminal. The OC-3 point-to-point network (Figure 2-27) consists of
OC-3 Multiplexers in the CO and RT sites, connected by four single-mode or
multimode fibers (two service, two protection). At the RT site, the OC-3
Multiplexer typically interfaces to digital loop carrier systems like the
SLC
Series 5
Carrier System. DS1 extensions to customer premises or another RT site are
provided by the DDM-Plus low-speed extension shelf or DDM-2000 FiberReach,
with a choice of DS1 line repeaters or quad DS1 optical interfaces. DDM-Plus
optical interfaces can be terminated at a DDM-Plus extension shelf or a DDM-Plus
distant terminal.
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