For reference purposes, here is a very high-level drawing of the major elements of a Motorola cable headend and how they typically connect. This drawing covers legacy SCTE 55-1 and 55-2 topology, which addresses out-of-band signaling to legacy set-top boxes. Modern set-tops use integrated DOCSIS cable modems or other IP connectivity to receive information, which offers faster connectivity and enables faster delivery of video on demand (VOD) content and apps.

DOCSIS Cable Headend Solution Diagram

This is the typical topology of a legacy Motorola Cable Headend with DOCSIS CMTS