Abstract: A modular frame assembly and modules are provided. The modular frame assembly includes a motherboard, module connectors and an opening in the motherboard for allowing direct connection of first and second modules. The first modules have plugs that extend through the plane of the motherboard, allowing the size of the opening to be minimized. The second modules have a wide external connector portion that allows for high density interconnection on the rear of the frame. Each of the modules may be provided with a plurality of connectors.

Abstract: A digital audio receiver with multi-channel swapping capabilities receives as inputs at least two AES serial digital audio streams. The audio streams are decoded, and each audio channel is stored in a separate buffer. The outputs of the buffers are input to at least two selectors. The selectors under user control select for each output digital audio stream which channels are represented. The recombined digital audio streams are then input to a conventional router cross-point matrix for directing to a desired destination and formatted into new AES serial digital audio streams.