Applications
Issue 8.0 July 2002
2-17
DDM-2000 OC-3 Ring Transport 2
The FT-2000 OC-48 Add/Drop-Rings Terminal equipped with Release 5.0.1-ADR
or later software can provide transport within a DDM-2000 OC-3 Ring. A
DDM-2000 OC-3 Ring is an end-to-end self-healing network providing
path-switched protection of DS1, DS3, EC-1, or OC-3 signals.
Figure 2-8 shows an OC-48 Ring equipped with FT-2000 OC-48 Add/Drop-Rings
Terminals that are used to close (or complete) a DDM-2000 OC-3 Ring. The
OC-48 Ring provides the needed bandwidth (three STS-1 tributaries) between CO
1 and CO 2. The DDM-2000 OC-3 Ring has four DDM-2000 OC-3 nodes and four
OC-3 signals (OC3 1, OC3 2, OC3 3, OC3 4) connecting them. The OC-3 1 signal
is transported between CO 1 and CO 2 by the FT-2000 OC-48 Add/Drop-Rings
Terminals. One or more OC-48 Ring segments or rings may be used as segments
of a DDM-2000 OC-3 Ring.
Figure 2-8. DDM-2000 OC-3 Ring Transport Application
The FT-2000 OC-48 Add/Drop-Rings Terminals at CO 1 and CO 2 are equipped
with OC-3 low-speed interfaces. The OC-3 low-speed interfaces may be used as
intra-office interfaces or interoffice optical extensions.
CO 4
OC-48
FT-2000*
OC-3 2
OC-3 4OC-3 5
CO 2/CEV 2
FT-2000 OC-48
2-Fiber Ring
DDM-2000
OC-3
Remote
Terminal
CO 3
FT-2000*
OC-48
FT-2000*
FT-2000*
DDM-2000
OC-3
DDM-2000
OC-3
OC-3 3
DDM-2000
OC-3
Remote
Terminal
OC-3 1
CO 1/CEV 1
OC-48
OC-48
The grey shading shows the extent of the OC-3 ring.
CO 5
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