363-206-295
Shelf Descriptions and Configurations
3-10 Issue 1 December 1997
OC-12 STS-1/VT1.5 Path Switched
Ring Configuration 3
Figure 3-5 shows a DDM-2000 OC-12 Multiplexer STS-1/VT1.5 path switched
ring configuration. As in the DDM-2000 OC-12 Multiplexer STS-1 ring shelf, there
is one set of OC-12 interfaces and a pair of TSI FLEX circuit packs. In this
configuration, however, there is also an IS-3 interface to a DDM-2000 OC-3
Multiplexer shelf where VT1.5 level path protection switching is completed. This
interface between DDM-2000 OC-3 and OC-12 Multiplexers is referred to as a
"0x1" interface. In this case, the DDM-2000 OC-12 Multiplexer feeds the STS-1
paths directly from the two rotations of the OC-12 ring to the OC-3 shelf.
Protection switching is done on the OC-3 Multiplexer shelf. The remaining function
units can be equipped with 3DS3, 3STS1E, or OLIU circuit packs as desired.
OLIUs can be used for optical extensions as in the OC-12 Multiplexer STS-1 level
path switched ring for interconnection to additional DDM-2000 OC-3 Multiplexer
shelves performing VT1.5 level path switching.
Figure 3-5. OC-12 STS-1/VT1.5 Path Switched Ring Configuration
IS-3
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2(P) 2(P) 2(P) 2(P) 2(P) 2(P) 2(P)
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1
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DDM-2000
DDM-2000
2
1
1
T
G
OC-12 Shelf
OC-3 Shelf
1
7
7
C
A
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1
7
7
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3
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1
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3
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1
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2
2
D
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U
2
2
D
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1 2(P)
D
S
3
D
S
3
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