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Shelf Descriptions and Configurations
3-18 Issue 3 June 2001
OC-3 DDM-2000 FiberReach Host Shelf 3
An example of an OC-3 DDM-2000 FiberReach host shelf is shown in
Figure 3-10. As a host node, the OC-3 shelf provides add/drop capability between
the OC-3 ring and OC-1 rings (DDM-2000 FiberReach extensions). The ring (0x1)
cross-connection between the rings supports full TSI assignment between the
low-speed and high-speed time slots while preserving independent service and
protection paths between the rings. Using 27-type dual OC-1 OLIUs in the
Function Units, a single OC-3 shelf can support up to six OC-1 extensions in a
single-homing arrangement (the 27-type OLIUs must be equipped in pairs). When
fully loaded with six 27-type OLIUs, the OC-3 shelf can support up to 12 OC-1
extensions in a dual-homing arrangement (for a maximum capacity of 84 DS1s).
Equipping the main slots with 24-type OLIUs allows the shelf to provide an OC-12
ring interface.
Note that In Group 1 or 3 shelves, a BBF5 jumper circuit pack must be installed in
Slot 8 of the low-speed group associated with the Function Unit equipped with a
pair of 27-type OLIUs. In addition, a BBF5 must be installed in Slot 4 if both OLIUs
in the function unit are 27G2-Us.
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