Technical data

2
2-1
2Original XR Chassis
Chassis Overview
The original style of the XR system chassis is available in the
following configurations:
❏
3-Slot
❏
Dual 9-Slot
❏
12-Slot
❏
20-Slot
3-Slot System
The Model XR9103 3-slot system (see Figure 2-1 on page 2-2) has a
front-loading 3-slot VME card cage with a rear-loading transition
card cage. The VME backplane accepts standard 6U 32-bit VME
modules from the front, and MVME700 series plug-in transition
modules from the rear. The system accommodates up to two 3
1
/ 2 -
inch, half-height, fixed- or removable-media drives. The drives
plug into the backplane above the VMEmodule connection area. A
sheet-metal insert separates them from the modules in the VME
card cage.
The system is available with either an AC or a DC power supply.
A DC-powered fan provides forced-air cooling for the
VMEmodules, drives, and power supply. Convection cooling is
used for the rear-mounted transition modules. Cooling air for the
VME card cage is drawn in at the front of the fan module, forced
past the VMEmodules, drives, and power supply, and vented
through the right rear panel of the system.