Introduction

Aitech’s E120 ¾ ATR-Short forced air-cooled enclosure is built to be rugged and reliable as well as lightweight and compact. EMI/RFI protected and environmentally sealed, the E120 is capable of withstanding extreme environmental conditions of altitude, temperature, moisture, shock, vibration, EMI and chemical exposure, making it ideal for use in military and aerospace environments.

STURDY MECHANICAL DESIGN

The E120 is constructed of durable CNC machined 6061-T6 aluminium. Fasteners are stainless steel and removable cover threads have self-locking stainless steel helicoils to withstand severe vibration and shock. All I/O connectors are located on the front panel of the enclosure for easy access. The chassis is forced air-cooled through a finned back wall and bulkhead. Designed with a built-in handle, the E120 is also equipped with two front mounting hooks and two rear hold-down pin receptacles to facilitate installation in standard ARINC 404 3/4-ATR mounting trays.

BOARD CAPACITY

The E120 accommodates 8 standard VMEbus boards with 0.8-inch pitch, including:

• 8 conduction-cooled cards (IEEE 1101.2 or VITA 30.1)
• 3/4 ATR conduction-cooled power supply

VMEBUS BACKPLANE

The backplane is VME64x compliant with 160-pin, 5-row J1/J2 DIN connectors and 95-pin P0 connectors in all slots.

Any of the pins in rows A and C and user-defined pins in rows Z and D of the J2 connectors as well as the 95 I/O pins from each of the P0 connectors (up to a maximum of 512) can be routed to front panel I/O connectors. DC input power is routed to the power supply via a separate screened harness so as to prevent radiated or conducted EMI.