The AMUX or audio MUX is a component of a total IFE (In-Flight Entertainment) installation. Our customer stated that we only have space for an LRU size of 2 which is quite narrow and it needed to contain and ARINC 600 connector, shell size 2 with a high pin count, high power and coax. Traditionally this would have been easy in as and LRU of 3 or larger but in such a narrow LRU it presented connectivity issues. During a presentation with the end user how was skeptical that it could be possible was impress with the elegant solution NETBased had provided.
While we do not do board layout, we do work with many customers in the physical design of boards as they relate to the chassis we develop for them. We suggested using a rigid-flex approach to make a reliable connection between the high pin/power count and the main processor board. After evaluating the concept, the approach was found as a sound approach.
We provided design constraints for both the main processor PC board as well as the rigid-flex board in both flat and formed condition. No one was interested in opening up the enclosure for airflow or fans due to clock speed on the processor board while trying to meet emmisions and immunity. To cool the processor board we provided layout recommendation to our customer for hot component placement. Based on this collaborative layout approach we used the enclosure as a heat sink and heat spreader to dissipate heat and keep the board well within thermal limits.
With the setup of board constraints it allowed us to concurrently design the chassis and get to prototyping quickly. Once boards, connectors, rigid-flex and hardware arrived we were able to do an initial fit check that was like a hand in clove. The prototypes were ready for homologation process.