Applications
2-18 Issue 8.0 July 2002
In Release 6 and later releases, the FT-2000 OC-48 Add/Drop-Rings Terminal
provides single-ended operation capabilities through the OC-3 DCC. For more
information about the single-ended operation capabilities, refer to the “Operations
Interworking” application in this section. For more information about operations
interworking between the FT-2000 OC-48 Lightwave System and the DDM-2000
Multiplexers, refer to 824-102-147,
2000 Product Family Operations Interworking
Guide
.
DDM-2000 OC-12 Ring Transport 2
The FT-2000 OC-48 Add/Drop-Rings Terminal equipped with Release 7.1-ADR or
later software can provide transport within a DDM-2000 OC-12 Ring. A
DDM-2000 OC-12 Ring is an end-to-end self-healing network providing
path-switched protection of OC-12 signals. Functionally, a DDM-2000 OC-12 Ring
is identical to an OC-3 ring, except for 0x1 DCC support and capacity of the ring.
Dual-Wire Center Architecture 2
The FT-2000 OC-48 Add/Drop-Rings Terminal equipped with Release 4.0.0-ADR
or 4.1.0-ADR software supports the dual-wire center architecture with EC-1
interfaces. The FT-2000 OC-48 ADD/Drop-Rings Terminal equipped with
Release 5.0.1-ADR or later software supports the dual-wire center architecture
with EC-1 and OC-3 interfaces (Figure 2-9).
A dual-wire center architecture is a self-healing network architecture that provides
end-to-end survivable DS1 and DS3 business access services. Figure 2-9 shows
two nodes in an OC-3 path-switched ring connected to two nodes in an OC-48
bidirectional line-switched ring with EC-1 interfaces and DACS IV-2000
Cross-Connect Systems. The EC-1 signals can contain a mixture of VT1.5
channels for all types of services. The capability to mix services, instead of having
application-specific assignments for STS-1 tributaries, conserves the bandwidth
of OC-3 access rings.
Traffic is routed from the terminating nodes in the DDM-2000 OC-3 path-switched
ring to the interconnecting DDM-2000 OC-3 Multiplexers using two-way VT1.5 or
STS-1 cross-connections. Drop and continue cross-connections are required at
the interconnecting DDM-2000 OC-3 Multiplexers. Each interconnecting
DDM-2000 OC-3 Multiplexer provides an EC-1 signal to a DACS IV-2000
Cross-Connect System.
Within the dual-wire center architecture, dual-wire center services and
non-dual-wire center services can be mixed on an EC-1 signal from the
DDM-2000 OC-3 Multiplexers (nodes 3 and 4) and sent to a DACS IV-2000
Cross-Connect System (nodes 6 and 7) to be VT-groomed (reassigned) for their
destination. VT-grooming between rings by a DACS IV-2000 Cross-Connect
System can optimize interoffice bandwidth usage. VT1.5 channels coming in to a
DACS IV-2000 Cross-Connect System are groomed so that the outgoing facility
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