ANSI/VITA 68.1-2025, Fixed Signal Integrity Budget

VITA 68.1 is part of the VITA 68.x family of standards for signal integrity compliance of VPX systems and components. Please refer to VITA 68.0 for an overview of the VITA 68.x family of standards. This standard defines a VPX compliance channel fixed signal Integrity budget including Plug-In Module performance criteria and common Backplane performance criteria required to support multiple fabric types across a range of defined baud rates up to 10.3125 Gbaud. This allows Backplane developers to design a VITA 68.1 compliant Backplane that supports required bit error rates (BER) for multiple fabric types when used with Plug-In Modules that are compliant to VITA 68.1 budget criteria. This also allows Plug-In Module developers to design VITA 68.1 compliant Plug-In Modules that are interoperable with other VITA 68.1 compliant Plug-In Modules when used with a VITA 68.1 compliant Backplane. VITA 68.1 defines a single budget encompassing Plug-In Modules and Backplanes at various baud rates, with a “large system budget” that supports interoperability of VITA 68.1 compliant Plug-In Modules with any VITA 68.1 compliant Backplane, including large slot count Backplanes with relatively long traces. i. This approach supports mix and match interoperability between VITA 68.1 compliant Plug-In Modules and Backplanes for the system integrator without requiring application-specific signal integrity efforts ii. But this approach does not support more complex systems, e.g. ones with transceivers on mezzanine cards. These more complex systems are outside the scope of VITA 68.1; refer to VITA 68.x dot specs.