Lucent Technologies DDM-2000 OC-3, User & Service Manual

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Applications
Issue 3 June 2001 2-3
Network Configurations 2
This part describes many of the network configurations in which the DDM-2000
Multiplexers can be used. In addition to the configurations specifically described,
many other combinations of these network configurations can be used to meet
specific application needs.
To clarify interface terminology, the terms single 0x1 and dual 0x1 have been
replaced with the term ring (0x1) low-speed interface(s) or simply (0x1). The
terms single and dual are used in describing homing topologies. The term 1+1 has
been replaced by the term linear (1+1) low-speed interface(s) or simply (1+1).
To clarify timing terminology, the term loop timing is a special case of line
timing. See the "Glossary" for definitions of these terms.
Path Switched Rings 2
The need to prevent service outage caused by network failure has created a new
class of applications. The 2000 Product Family offers a wide range of self-healing
network features that automatically protect against service outage caused by
cable cuts and equipment failures, which in turn protect customers and generate
increased revenue. These self-healing features include flexible DACS-based
restoration with the
ITM XM controller, FT-2000 OC-48 Lightwave System two-
and four-fiber rings, DDM-2000 OC-3 and OC-12 virtual tributary 1.5 (VT1.5) and
STS-1 path switched rings, and
SLC -2000 Access System path switched rings.
DDM-2000 OC-3, SLC -2000 Access System, and DDM-2000 OC-12 self-healing
rings offer the performance and administrative benefits demonstrated by the
successful Lucent FT Series G Ring Diversity Switch. Since the DDM-2000 OC-3
and OC-12 path switched rings operate in an integrated, single-ended fashion,
complex network-level coordination is not necessary to restore traffic. This means
restoration is faster and more reliable. Furthermore, bandwidth administration and
network reconfigurations (for example, adding or deleting nodes) can be easier
because path switching does not require special time slot assignment rules.