Sony PCV-RX480DS - Manual (Page 91)

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Chapter 5
Fax/Modem Card
The fax/modem card occupies PCI slot No. 1. Your computer is either
installed with a HomePNA modem or Lucent 1648 modem depending on
the configuration you purchased.
To determine the modem installed on your computer, locate the RJ-11
jacks on the back of your system. If one RJ-11 jack exists, you have a
HomePNA modem; if two RJ-11 jacks exist, you have a Lucent 1648
modem.