The AXP-3 Analog Audio Module provides 4 channels of balanced, +4 dBu analog audio on XLR connectors, for each video input or output. The AXP-4 Analog Audio Module may also be used in conjunction with the AXP-3, providing 4 additional audio channels—normally channels 4 through 8. Audio outputs from the AXP-3 and AXP-4 exactly duplicate embedded audio contained within a video stream. The AXP modules are housed in a 2-RU rack-mount enclosures (3½” – 88mm high), which connect to the main server chassis with a 1-meter, 68-pin cable, included with the AXP. The module is self-powered from AC mains, and contains all audio circuitry. (It is not a connector ‘break-out box’.) AXP-3 Analog Audio I/O Module 

The AXP modules contain dual redundant power supplies, operating from two separate AC mains connections. Either power input can be lost with no effect on audio throughput. Two blue LEDs indicate operation of the power supplies. Precision internal trimmers allow input-output gain to be adjusted by ±1 dB. There are no external controls or adjustments on the AXP modules.