363-206-305
Applications
Issue 3 June 2000
2-25
A mix of the enhanced routing services shown in Figure 2-14, Figure 2-15, and
Figure 2-16 can be created in a single DDM-2000 FiberReach host. OC-3
Release 9.1 and later software and 27G2-U OLIUs are needed for these services.
DDM-2000 FiberReach Network
Topologies (OC-3 and OC-12)
2
28-Type Optical Line Interface (28G-U/28G2-U)
2
This section describes applications in which the FiberReach multiplexer is
equipped with the 28-type OC-3 OLIUs in the Main slots.
Circuit Pack Overview
2
The 28-type is used in the Main slots of the DDM-2000 FiberReach shelf in a
unidirectional path protection switched OC-3 ring configuration.
The primary functions of the 28-type OLIU are to multiplex up to 7 VT-G signals
and 3 STS-1 signals, or 3 STS-1 signals into a single OC-3 optical signal in the
transmit direction; to demultiplex an OC-3 signal into 3 STS-1 signals or 2 STS-1
signals and up to 7 VT-G signals in the receive direction; to provide for cross-
connections among the 3 STS-1s and all VT1.5 signals that may be embedded
within any of the STS-1s and provide system clock and frame.
The 28-type provides timing for the entire wideband shelf. Two modes will be
provided: line-timed and holdover. Figure 2-17 displays OC-3 Ring Mixed
Application with DDM-2000 FiberReach. DDM-2000 OC-3 and
SLC
-2000 ARM
shelves on the same OC-3 ring.
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