IEEE 1101.1-1998 pdf download IEEE Standard for Mechanical Core SpeciÞcations for Microcomputers Using IEC 60603-2 Connectors
8. Plug-in unit description
A plug-in unit can be of various types, as is shown in Figure 1. lt usually consists of a printed board assembly with connector(s) and, optionally, handle(s), ejector(s), front panel, rear panel, mounting rails, and cov.ers.
A plug-in unit can itself house a plurality of different types of plug-in units. Box-type plug-in units mayhouse board-type plug-in units or other subassemblies.
9. Plug-in unit dimensions
9.1 Board-type plug-in units
DT2 in Table 5 is the inspection dimension to ensure reliable connector mating2For connector detail. see IEC 60603-2 (1995-09).
5For a nominal 5.08 mm (0.2 in) width filler panel (see Figure 14), the 7.47 mm (0.294 in) dimensionis reduced to 2.35 mm (0.093 in).4Maximum dimensions for location features for front panel alignment or screw retention, or both, areshown in Figures 13 and 14. The standard M2.5 screw mounting does not exclude other means ofretention or quick-release fasteners (to be agreed upon by vendor and user). Slotted or plus-typescrew heads are permitted.
Double-sided surface-mounted devices (SMD) mounting on plug-in boards may result in changes ofthe relationship of front panel, guide rail, and backplane positioning relative to the subrack (see Figure 15).
The injector/ejector design detail can be derived from Figures 8 and 9, and can be manufactured ofvarious materials (see 12.6.2). This detail is restricted to individual boards plugged into the subrack,and is not suitable for front panel mounted boards or within a box-type plug-in unit (see Figure 19).The dimension between the front attachment plane and the beginning of the board guide has beenincreased from z 6 mm (0.236 in) as per IEC 60297-3 (1984-01) to 2 10 mm (0.393 in) as per IEC60297-4 (see Figures 28 through 33) in order to allow for injector/ejector operation.8Board-type plug-in units with front panels may require handles. The details of handles and theirpositioning on the front panels are not specified in this standard.9The recommended plug-in unit front panel thickness is 2.5 mm (0.098 in).
9.2 Box-type, box/board-type plug-in units
DT2 is the inspection dimension to ensure reliable connector mating. For inspection dimensions, seeTable 5.
2For connector details,see IEC 60603-2 (1995-09).Box-type plug-in units are designed to interface with the subrack, as specifed in Clause 1l. via asingle board,as specified in Figures 3 through 5, with connectors attached. Additionally, the box.type plug-in units may be used to house large components.41Box/board-type plug-in units are designed to interface with the subrack, as specified in Clause 11via one or more board-type plug-in unit(s), as specified in Figures 3 through 5 and 10 through 12.with connector(s) attached [see IEC 60603-2 (1995-09)]. Individual front panels can be replaced bysingle plug-in unit front panels, or in other combinations of N x 5.08 m (0.2 in)5Box and box/board-type plug-in units may require handles [see 9.1, item 8)].
IEEE 1101.1-1998 pdf download
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