SBC comm Efficient Networks 5260 5260MC02A - Manual (Page 13)

Installation Guide for Customer Self-Install: Efficient Networks® 5260, Macintosh Page 12
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Step 6:
Install the Efficient Networks® DSL Modem
Your computer should be turned on. Your modem should be turned OFF.
You should be at the following screen in the SBC Express Installation Software:
6-1 Consult the following diagram to install your modem.