Applications
Issue 8.0 July 2002
2-31
The FT-2000 OC-48 Add/Drop-Rings Terminal must be located in a controlled
environment facility (for example, a controlled environment vault [CEV],
temperature controlled hut, or central office).
Figure 2-13 shows the following OC-3 connections between the DDM-2000
Multiplexers and an FT-2000 OC-48 Add/Drop-Rings Terminal equipped with
OC-3 low-speed interfaces:
■ OC-3/IS-3 intra-office connection to a local DDM-2000 OC-3 Multiplexer
(CEV 1)
■ OC-3 interoffice connection to a remote DDM-2000 OC-3 Multiplexer
(CEV 2)
■ OC-3/IS-3 intra-office connection to a local DDM-2000 OC-12 Multiplexer
(office building).
An STS-3 payload can enter the two-fiber ring via an OC-3 interface and exit the
two-fiber ring via an OC-3 interface or a mix of DS3 and EC-1 interfaces at
another node.
The OC-3 signal or the available DS1 timing outputs and inputs can be used to
distribute network timing from the FT-2000 OC-48 Add/Drop-Rings Terminal to the
DDM-2000 Multiplexers and SLC
â
-2000 access systems.
In Release 5, the OC-3 interface should be used where the OC-3 section DCC
and integrated single-ended operations with the DDM-2000 Multiplexers are not
required. In Release 6 and later releases, the FT-2000 OC-48 Add/Drop-Rings
Terminal supports the OC-3 section DCC and integrated single-ended operations
with the DDM-2000 Multiplexers. For more information about the single-ended
operation capabilities, refer to the “Operations Interworking” application in this
section.
For more information about operation 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
.
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