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2-36 Issue 3 June 2001
Enhanced Routing 2
DDM-2000 FiberReach hosts can support a collection of enhanced routing
features as shown in Figure 2-23, Figure 2-24, Figure 2-25, and Figure 2-26.
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 3 function units has a two OC-1
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.
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 systems at the path endpoints. 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.
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