Sony MX Operating Instructions Manual page 19

Connection for a TV coaxial cable (supplied).
16 Line IN jacks (R/L)
Connection for an audio device.
17 Line OUT jacks (R/L)
Connection for an audio device.
18 Stereo speaker terminals (R/L)
Connection for the supplied stereo speakers to the computer.
19 Telephone cable jack
Connection for a phone cable to the computer.
20 Modem line jack
Connection for a modem (supplied) cable to the wall jack.
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