Communication Cards
3-12 Rev 2/01
3.5.3 Dial-Up Modem Communications Card Wiring
The dial-up modem card interfaces to a PSTN line through the RJ11 jack located at J2 with two wires.
The dial-up modem card provides for a telephone interface on the host port that is capable of both
answering and originating phone calls. The dial-up modem card also provides electronics that
conserve power when the phone line is not in use. The dial-up modem card provides some protection
from transients on the phone lines; however, if the potential for lightning damage is high, additional
surge protection for the phone lines should be installed outside the EF-Series enclosure.
LEDs are provided for diagnostic functions. The dial-up modem card provides a modular phone
(RJ11) jack that directly interfaces to phone line connections. The RJ11 conductors and their signals
are:
RJ11 Signal
1
2
3Tip
4Ring
5
6
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