Sony PCV-E203 - Manual (Page 68)

VAIO MicroTower System Reference 60
Modem In Connector
The Modem In connector (J9) on the motherboard is a 1 x 4-pin header
connector and connects to the audio output connector (J4) on the fax/
modem card.
J9
Pin Signal Name
1 GND
2 MONO_O (to modem chip)
3 GND
4 MONO_I (to sound chip)
KY0061.VSD
J9