363-206-305
Administration and Provisioning
8-42
Issue 3 June 2000
Dual-Homed Path-Switched Ring Example
8
Dual-homing offers even more survivability than a single-homed network, as even
the catastrophic failure of a host node can be protected. Figure 8-3 shows an
example of a dual-homed OC-1 extension from two remote nodes on an OC-3
access ring. The network elements on the OC-3 ring can be either DDM-2000
OC-3 Multiplexers or
SLC
-2000 Access Systems.
Figure 8-3. Example Dual-Homed Path-Switched Ring Configuration Cross-
Connections
OLIU
IN
OUT
OLIU
IN
OUT
Ring 2
Ring 1
OLIU
IN
OUT
OLIU
IN
OUT
OLIU
IN
OUT
OLIU
IN
OUT
OLIU
IN
OUT
OLIU
IN
OUT
Ring 1
MAIN 1MAIN 2
MAIN 1MAIN 2
MAIN 1 MAIN 2 MAIN 1 MAIN 2
FIBERREACH
RT4
RT3
OC-3 RING
Ring 2
Ring 1
Ring 2
MAIN 1 MAIN 2
DS1s
RT1
OLIU
IN
OUT
OLIU
IN
OUT
MAIN 2 MAIN 1
RT2
CO
DS1s
OC-1OC-1
OC-1 RING
LS-A
LS-B
LS-C LS-D
FN-A
FN-B
FN-C
FN-A
FN-B
FN-C
FN-A
FN-B
FN-C
FN-A
FN-B
FN-C FN-A
FN-B
FN-C
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