363-206-305
Applications
Issue 3 June 2000
2-23
OC-1 Ring Hairpin Routing, Dual-Homed
2
This routing option establishes cross-connections between channels on two
separate OC-1 facilities that terminate on 27G2-U OLIU circuit packs in either the
same or different Function Units. (See Figure 2-15.) In the dual-homed
arrangement, only one rotation of each of the two OC-1 rings terminates on a
single OC-3 shelf. At the OC-3 shelf, there may be a single 27G2-U OLIU that
terminates both rings or a 27G2-U OLIU in each of two Function Units that
terminates the rings. The other rotation of each ring terminates on a different OC-
3 shelf. This allows traffic to be routed from one FiberReach node on one OC-1
ring to any other FiberReach node on another OC-1 ring without using bandwidth
on the OC-3/OC-12 ring.
NOTE:
For a step-by-step provisioning example, refer to the “OC-1 Ring Hairpin
Routing, Dual-Homed Example” section in Chapter 8.
Figure 2-15. Dual-Homed Hairpin Routing
OC-3/OC-12
CENTRAL OFFICE
DS1/EC-1/IS-3/OC-3
OC-1
DS1
DDM-2000
FiberReach
Wideband Shelf
DDM-2000
FiberReach
Wideband Shelf
RT HOST NODE
R
DDM-2000/
SLC
-2000
Access System
RT HOST NODE
DDM-2000/
SLC
-2000
Access System
DDM-2000/
SLC
-2000
Access System
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