Sony PCV-R553DS - Manual (Page 85)

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Chapter 5
Fax/Modem Card
The fax/modem card occupies PCI slot #1. There are two RJ-11 jacks: one
to connect a telephone line, and one to connect a phone.
Connectors
Name Connector Type Description
TELEPHONE RJ-11 Connects to phone
LINE RJ-11 Connects to telephone line
KY0038.VSD
TELEPHOINE
LINE