Zenith Data Systems Z-171 PC Series Service Manual page 26

Page 2-9
Installation
Composite video connector — This RCA phono jack supplies a video
output signal for use with an external monochrome monitor. This connec-
tor is provided with the optional color video board.
Phone/modem connector — This jack is used for the internal 300/1200
baud, Hayes-compatible modem. It connects to a modular-type telephone
cable and may also be used as an external modem using an RS-232C
port.
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Figure 2-7: Rear Panel Connectors