363-206-285
Shelf Descriptions and Configurations
3-14 Issue 3 June 2001
OC-3 Ring Shelf with Optical Extension 3
An example of an OC-3 ring shelf with an optical extension is shown in Figure 3-6.
The 22-type OLIU circuit packs in the main positions carry ring traffic. The 22-type
OLIU circuit packs in function unit B or C positions provide the optical extension
capability. Optical extensions can also be provided from function unit A.
Equipping the main slots with 24-type OLIUs allows the shelf to provide an OC-12
ring interface.
Figure 3-6. DDM-2000 OC-3 Ring Shelf With an Optical Extension
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234
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AUXCTL
SYSCTL
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8(P)
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Timing Main
Group A Group B Group C
Function Units
Low Speed
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