BS 5954-3:1985

National foreword
Committees responsible
Specification
1 Scope
2 Object
3 General arrangement
4 Subrack description
5 Plug-in unit description
6 Subrack basic dimensions
7 Plug-in unit and printed board basic dimensions
8 Mechanical interchangeability of plug-in units
8.1 Positions of connectors on plug-in units
8.2 Positions of fixed connectors on subracks
Appendix
A Mounting of connectors specified in IEC Publication
     603-2
Tables
I Subrack basic dimensions
II Plug-in unit and printed board basic dimensions
III Inspection dimensions Dc
IV Inspection dimensions Dt2
V Positions of connectors on plug-in units
Figures
1 General arrangement of rack, subrack, printed board
     and plug-in unit
2 Subrack basic dimensions
3 Printed board type plug-in unit. Basic dimensions
4 Box type plug-in unit. Basic dimensions
5 Basic parameters
6 Free connector positions
7 Edge board contact positions
8 Inspection dimensions Dt2
9 Dimensions Z1
10 Position of connectors on plug-in units of 3U
     subracks
11 Position of connectors on plug-in units of subracks
     greater than 3U

Specifies dimensions that will ensure the mechanical interchangeability of subracks and of plug-in units. Covers the basic dimensions of a modular range of subracks for mounting in equipment together with the basic dimensions of a compatible range of plug-in units and printed boards. Specifies the standard positions of free connectors such that plug-in units are mechanically interchangeable in subracks with corresponding fixed connector positions. Also includes tables and diagrams.