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Names of each part
Plugging in/Pulling out and Replacing Board
1. Service processing board (such as PQ1)
2. Service interface
board (such as D75S)
3. Optical interface board (such as
SL16)
4. STM-1/4/16 system control, cross-connect, optical interface board 5. Auxiliary interface board (SAP)
6. Front panel 7. Signal cable interface 8. Optical interface
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