XFINITY Set Top Box installation - XFinity

I am trying to install the Set-Top Box, which must be installed before Dec. 12. I have reviewed the Quick Start Guide. My present hookup includes a Scientific Atlanta Explorer 8300HDC box, which is used to gain access to the HD channels and make recordings of programs. No mention of this device is made in the Quick Start Guide. Is it no longer needed or do I somehow connect it into the new setup.

This question, "XFINITY Set Top Box installation," is about XFinity-Comcast TV television equipment.

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