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The sticker at the bottom of the telecom optical modem is its account book: model, SN, default terminal configuration password, LOID, management address—every line has a chance to save its life. Fault reporting requires SN, account closure and verification requires SN, and accessing the backend requires that fine-print password. I'll explain each of the three optical modems I have on hand, and how to fix stickers that are smudged....