New IEEE Standard - Superseded. Superseded by IEEE 1101.1-1998. The basic dimensions of a range of modular subracks conforming to IEC 60297-3 (1984-01) and IEC 60297-4 (1995-03) for mounting in equipment according to IEC 60297-1 (1986-09) and ANSI/EIA 310-D-1992, together with the basic dimensions of a compatible range of plug-in units,printed boards, and back-planes, are covered. The dimensions and tolerances necessary to ensure mechanical function compatibility are provided. This standard offers total system integration guide-lines with attendant advantages, such as reduction in design and development time, manufacturing cost savings, and distinct marketing advantages.