363-206-305
Applications
2-20
Issue 3 June 2000
Enhanced Routing
2
The DDM-2000 hosts can support a collection of enhanced routing features, as
shown in Figure 2-13, Figure 2-14, Figure 2-15, and Figure 2-16. These features
support cross-connections within and across Function Units without using
bandwidth on the main OC-3 or OC-12 rings. This allows even greater networking
flexibility and efficiency. While the high-speed OC-3 interface can carry up to 84
VT1.5 channels, each of the three Function Units has a two-OC1 capacity, or up to
an additional 168 VT1.5 channels. For example, a DDM-2000 OC-3 system with
22-type OLIUs in the Main slots and 27G2-U dual OC-1 OLIUs in each Function
Unit supports up to 168 VT1.5 channels: 84 between high-speed OC-3 and low-
speed OC-1, and another 84 channels that pass directly between this host's
remote FiberReach system.
NOTE:
SLC-
2000
has only two function groups (A and C) rather than three in
DDM-2000.
The OC-1 ring interconnection enhanced routing options utilize 0x1 or pass-
through cross-connections at the DDM-2000 host. Path protection switching is
performed at the DDM-2000 FiberReach system at the path midpoints. The local
drop enhanced routing option employs path protection switching in the OC-3
host's Function Unit in order to drop to local EC-1, DS1, or OC-3 ports. This local
drop option requires the use of OC-3 Release 11.0 and later software at the
DDM-2000 host.
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