22 NCA-2 Manual — P/N 52482:M5 03/20/2019
Installation CHS-M3 Chassis
3.5 CHS-M3 Chassis
3.5.1 Layout
The NCA-2 mounts in chassis CHS-M3 in the top row of the cabinet.
The NCA-2 occupies the left half of the chassis (positions 1 and 2, see
Figure 3.3).
Positions 3 and 4 of CHS-M3 can hold up to four layers of equipment
including annunciators and option boards. See Figure 3.4 for possible
configurations of these four layers.
The BMP-1 Blank Module Plate covers unused positions and also pro-
vides a location to door-mount some option boards (see BMP-1 Product
Installation Drawing for details).
3.5.2 NCA-2 Mounting
Mount NCA-2 into positions 1 and 2 of CHS-M3 as follows; equipment may be mounted to the chassis before or after the chassis is
mounted in the backbox.
1. Attach three 1-15/16” (4.92 cm) aluminum male/female 4-40 standoffs (P/N 42076, included with NCA-2) to chassis as shown in
Figure 3.5.
2. Slide circuit-board tabs into slots on chassis as shown in Figure 3.5.
3. Place the board over the stand-offs so that mounting holes line up with those on the chassis. Secure all stand-offs with 4-40 screws
provided (P/N 38134).
Figure 3.3 Chassis CHS-M3
1
2
3
4
Four positions
on chassis
CHS-M3
Positions 3 and 4:
Four layers of equipment
Positions 1 and 2:
CPU
CHS-M3.wmf
Layer 4 mounted to
PEM studs and tab-slot
Layer 4 door-mounted
Layers 1&2&3 mounted to
PEM studs on chassis
Layers 1&2&3 mounted to
PEM studs on chassis
Layers 1&2 mounted to
PEM studs on chassis
Layer 4 mounted to PEM
studs and tab-slot; Layer 3
suspended from Layer 4
CHS-M3-options.wmf
Figure 3.4 Configuring Equipment in Chassis Positions 3 and 4 of CHS-M3 (Side View)
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