363-206-305
Maintenance Description
Issue 3 June 2000
9-17
OC-3/OC-1 Ring Interworking
9
The DDM-2000 OC-3 Multiplexers support both dual-homed and single-homed
FiberReach ring interworking applications to provide end-to-end protection from
loss of service on traffic traveling over interconnected rings. The dual-homed
configuration provides two points (nodes) of interconnection between the OC-3
Multiplexer ring and the FiberReach OC-1 ring to insure a continuation of service
between rings, should one interconnecting node fail. The DDM-2000 OC-3 ring
interconnects with the FiberReach ring through 0x1 interfaces. The 0x1 interface
on the DDM-2000 OC-3 Multiplexer passes traffic from one direction of the OC-3/
OC-1 ring to one direction of the FiberReach ring. There is no bridging of traffic
onto both rings at the 0x1 interface as there is at a ring drop point. Also, no path
protection switching or line protection switching is performed on the OC-3 for
traffic connected to the 0x1 interface. Path protection switching is performed on
the FiberReach nodes and on the DDM-2000 OC-3 nodes at the traffic exit (drop)
points.
OC-3/OC-1 Path Switched Ring (0x1)
9
The OC-3/OC-1 path switched ring is similar to the OC-3/OC-12 ring-on-ring. A
DDM-2000 FiberReach shelf interconnects with a DDM-2000 OC-3 ring host shelf
through low-speed OC-1 interfaces on the OC-3 ring shelf. VT/STS path
protection switching is done on the DDM-2000 FiberReach shelf.
In single homing, the DDM-2000 FiberReach ring interconnects through a pair of
low-speed OC-1 0x1 interfaces on the OC-3 shelf.
In dual homing, the OC-1 ring interconnects through the low-speed OC-1 0x1
interfaces on two separate and normally non-collocated OC-3 shelves.
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