A8. Wedge clamp side gap considerations........................................................................................ 68
A8.1. Wedge clamp on the secondary side of the plug-in unit .......................................................... 68
A8.1.1. Worst case tolerance analysis.............................................................................................. 69
A8.1.2. RSS tolerance analysis ........................................................................................................ 69
A8.2. Wedge clamp on the primary side of the plug-in unit............................................................... 69
A8.2.1. Worst case tolerance analysis.............................................................................................. 70
A8.2.2. RSS tolerance analysis ........................................................................................................ 70
A9. Thermal expansion/contraction considerations ........................................................................... 70
A10. Summary/conclusion ................................................................................................................ 71
Table of Figures
Figure 1. 3U board size. ..................................................................................................................... 10
Figure 2. 6U board size, component side 1 (primary side) view. .......................................................... 11
Figure 3. General configuration of 3U conduction cooled plug-in units on 0.80 and 0.85 in. centers.13
Figure 4. General configuration of 3U conduction cooled plug-in units on 1.00 in. centers, primary side
wedge clamps. .................................................................................................................... 13
Figure 5. General configuration of 3U conduction cooled plug-in units on 1.00 in. centers, secondary
side wedge clamps.
............................................................................................................. 14
Figure 6. General configuration of 6U conduction cooled plug-in units on 0.80 and 0.85 in. centers... 15
Figure 7. General configuration of a 1.00 in. pitch 6U conduction cooled plug-in unit, primary side
wedge clamps.
.................................................................................................................... 16
Figure 8. General configuration of a 1.00 in. pitch 6U conduction cooled plug-in unit, secondary side
wedge clamps.
.................................................................................................................... 17
Figure 9. Envelope dimensions for a Type 1, 3U, 0.80 in. pitch conduction cooled plug-in unit
assembly.
............................................................................................................................ 20
Figure 10. Envelope dimensions for a Type 1, 3U, 0.85 in. pitch conduction cooled plug-in unit
assembly.
............................................................................................................................ 21
Figure 11. Envelope dimensions for a Type 1, 3U, 1.00 in. pitch conduction cooled plug-in unit
assembly.
............................................................................................................................ 22
Figure 12. Envelope dimensions for a Type 1, 3U, 1.00 in. pitch conduction cooled plug-in unit
assembly.
............................................................................................................................ 23
Figure 13. Envelope dimensions for a Type 1, 6U, 0.80 in. pitch conduction cooled plug-in unit
assembly.
............................................................................................................................ 24
Figure 14. Envelope dimensions for a Type 1, 6U, 0.85 in. pitch conduction cooled plug-in unit
assembly.
............................................................................................................................ 25
Figure 15. Envelope dimensions for a Type 1, 6U, 1.00 in. pitch conduction cooled plug-in unit
assembly.
............................................................................................................................ 26
Figure 16. Envelope dimensions for a Type 1, 6U, 1.00 in. pitch conduction cooled plug-in unit
assembly.
............................................................................................................................ 27
Figure 17. Envelope dimensions for 3U and 6U conduction cooled plug-in unit assemblies showing the
relationship of plug-in unit cover size as a function of plug-in unit pitch.
............................ 28
Figure 18. Plug-in unit frame-to-PCB relationship. Dimensions shown are applicable to both 3U and
6U form factor plug-in units.
................................................................................................ 29
Figure 19. Location of wedge clamp on 0.80 in. pitch plug-in units (3U and 6U) that is compliant with
an IEEE 1101.2 compliant sub-rack interface.
.................................................................... 31
Figure 20. Location of wedge clamp on 0.85 in. pitch plug-in units (3U and 6U) that is compliant with
an IEEE 1101.2 compliant sub-rack interface.
.................................................................... 31
Figure 21. Location of wedge clamp on 1.00 in. pitch plug-in units (3U and 6U) that is compliant with
an IEEE 1101.2 compliant sub-rack interface.
.................................................................... 31
Figure 22. Location of wedge clamp on 1.00 in. pitch plug-in units (3U and 6U) that is compliant with
an IEEE 1101.2 compliant sub-rack interface.
.................................................................... 32
Figure 23. Plug-in unit insertion process and required features in the extraction/insertion lever and
sub-rack.
.............................................................................................................................. 34
Figure 24. Plug-in unit extraction process and required features in the extraction/insertion lever and
sub-rack.
.............................................................................................................................. 35
Figure 25. View of sub-rack showing features required for insertion and extraction............................. 36
Do not specify or claim conformance to this document
Mechanical Specifications for Microcomputers Using REDI, VITA 48.2 (Rev. D0.06) - 5 -
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