363-206-305
Applications
Issue 3 June 2000
2-13
Dual-Homed Access via a Backbone Ring
2
Dual homing offers even more survivability than a single-homed network. Even
the catastrophic failure of a host node can be protected. Figure 2-6 illustrates
dual-homed OC-1 extensions from four remote nodes to an OC-3 access ring.
The host nodes can be two DDM-2000 OC-3 Multiplexers, two
SLC
-2000 Access
Systems, or one DDM-2000 OC-3 Multiplexer and one
SLC
-2000 Access System.
Path protection switching is employed for dual-homed applications, just like in
single-homed applications. That is, 60 millisecond path switching is supplied by
the remote DDM-2000 FiberReach nodes and the DDM-2000 OC-3 or OC-12
systems in the wire center. The OC-3 host node configuration differs from that
used for single-homing because each host node terminates only one leg of the
OC-1 extension. At each host node, a connection is made from the single OC-1
extension to just one rotation of the OC-3/OC-12 host ring. Dual- and single-
homed extensions can also be mixed at a host node, allowing the access network
to be tailored efficiently to different groups of customers.
Figure 2-6. DDM-2000 FiberReach Dual Homing to a DDM-2000 OC-3/OC-12 Ring
Wire Center
OC-1
RT Sites
OC-1
OC-3/OC-12
DDM-2000
OC-3/OC-12
DS1/EC-1/IS-3
DDM-2000
OC-3/OC-12
DDM-2000
OC-3/OC-12
tpa 826720/01
High-Rise "Fiber
in the Riser" ring
DS1/T1
DDM-2000
FiberReach
Wideband Shelf
DS1/T1
DDM-2000
FiberReach
Wideband Shelf
DS1/T1
DDM-2000
FiberReach
Wideband Shelf
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