That funny connector is also present on the SPARCstation 10, and 
SPARCstation 20, used for AUI on both, but there is a second one on 
those models which is used for the parallel port interface.

The audio signal lines in the AUI/audio version are only present on 
the LX and the SS10, because those were the only models that have the 
Sun DBRIe ISDN interface (which does ISDN and audio).

	Erik <fair@clock.org>