Applications
Issue 8.0 July 2002
2-29
Traffic is routed from the terminating node in the DDM-2000 OC-3 path-switched
ring to the interconnecting DDM-2000 OC-3 Multiplexers using two-way add/drop
and pass-through cross-connections. Unprotected 0x1 connections are supported
between the OC-3 path-switched rings and the OC-48 bidirectional line-switched
ring.
Each interconnecting FT-2000 OC-48 Add/Drop-Rings Terminal accepts one
OC-3 signal or two OC-3 signals. Traffic is routed through the OC-48 bidirectional
line-switched ring using two-way STS-3 cross-connections at the FT-2000 OC-48
Add/Drop-Rings Terminals.
Cross-connections can be made using the CIT or message-based operations
system interface. The message-based operations system interface uses X.25
protocol and TL1 messages. For more information about cross-connections, refer
to Volume I, Section 8, "Administration and Provisioning."
The path-in-line architecture protects against facility failures, node failures, and
interconnection failures. A failure in one ring or a single simultaneous failure in
each ring is automatically healed and service is reestablished in ≤60 milliseconds
(includes detection and switching times). This results in a highly reliable network.
Any failures on the OC-48 bidirectional line-switched ring are protected by the
FT-2000 OC-48 Add/Drop-Rings Terminal using two-fiber ring protection
switching. For more information about two-fiber ring protection switching, refer to
Volume I, Section 9, “Maintenance Description.”
Any failures in the OC-3 path-switched rings or in the interconnections between
the rings are protected by the DDM-2000 Multiplexers using path-protection
switching. For more information about the DDM-2000 Multiplexers, VT1.5 and
STS-1 cross-connections, and path-protection switching, refer to 363-206-200,
DDM-2000 Multiplexer, Applications, Planning, and Ordering Guide
.
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,
Lucent
Technologies 2000 Product Family Operations Interworking Guide
.
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