MIL-PRF-85726B(AS)
TABLE II. Standard enclosure size and configuration.
Enclosure
Module
Backplane interconnect
Max enclosure
size
size
medium
Weights, pounds (Kg)
2 MCU
SEM Format B
Multilayer board
14.3 (6.49)
4 MCU
SEM Format C
3 level wire wrap or
25.3 (11.48)
multilayer board
4 MCU
2 levels of SEM Format
2 multilayer boards
25.3 (11.48)
B
35.2 (15.97)
6 MCU
1 level of SEM Format B; 2 backplanes using 3 levels of
1 level of SEM Format C wire wrap each or 2
multilayer boards
6 MCU
SEM Format E
3 level wire wrap or
35.2 (15.97)
multilayer boards
8 MCU
2 levels of SEM Format
2 backplanes using 3 levels of
47.3 (21.46)
C
wire wrap each or 2
multilayer boards
8 MCU
1 level of SEM Format B; 2 backplanes using 3 levels of
57.2 (25.95)
1 level of SEM Format E wire wrap each or 2
multilayer boards
10 MCU
1 level of SEM Format C; 2 backplanes using 3 levels of
57.2 (25.95)
1 level of SEM Format E wire wrap each or 2
multilayer boards
12 MCU
2 levels of SEM Format
2 backplanes using 3 levels of
67.1 (30.44)
E
wire wrap each or 2
multilayer boards
3.3.4 Enclosure hold-downs.
3.3.4.1 Front. The enclosure shall be attached with two (one on the 2-MCU enclosure size)
hooks or functional equivalents, located on the front of the enclosure as shown on figure 3.
These hooks or other means of attachment shall be used to apply the force required to insert the
rear-mounted connector, establish preload, and secure the front of the enclosure.
3.3.4.2 Rear. The rear hold-downs shall mate with dagger pin receptacles in accordance
with figure 4 or a rack and panel connector but not both.
3.3.5 Module types. The six MCU enclosure types shall accept a random mix of SEM
Format E modules mounted at pitches of 0.4, 0.5, and 0.6 inch (10.2, 12.7, and 15.2 mm). The
4-MCU enclosure shall accept a random mix of SEM Format C modules mounted at pitches of
0.3, 0.4, 0.5, and 0.6 inch (7.6, 10.2, 12.7, and 15.2 mm). The 2-MCU enclosure shall accept
SEM Format B modules mounted on pitches that are multiples of 0.3 inch (7.6 mm). Card
guides uniquely machined for a given system are permissible with all enclosures.
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