Apple Workgroup Server 8150/110 - Manual (Page 125)

Your server produces stereo sound and provides several options for high-
quality audio.
When an audio device is connected to the sound input port, you can hear or
record the incoming sound on the server.
When an audio device is connected to the sound output port, you can record
the sound produced by the server or play that sound through external speakers.
This appendix explains how to connect stereo equipment to your Workgroup
Server 8150.
Appendix D Using Stereo Audio