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A crosspoint (XP) is a switch and router logic unit that includes two interconnect ports and two device ports, and is the fundamental component of the CCN-502 transport mechanism.
A collection of XPs arranged in a dual-simplex ring topology provides all the packet transport capability for a CCN-502 system.
Each XP includes transport and routing capabilities for each of the four channels:
Because the XP is the entry and exit point for the CCN-502, it includes an optional DSSB for XP to device communication. The inclusion of DSSB in the XP to device communication path is optional depending on the clocking requirements of specific devices that are attached to an XP.