Communication Cards
3-6 Rev 2/01
3.3.3 Dial-up Modem Communications Card
The dial-up modem communications card supports V.22 bis/2400 baud communications with auto-
answer/auto-dial features. Refer to Figure 3-3. The modem card is FCC part 68 approved for use with
public-switched telephone networks (PSTNs). The FCC label on the card provides the FCC
registration number and the ringer equivalent. The modem card has automatic adaptive and fixed
compromise equalization.
This is an optional communications card for the host port. The dial-up modem communications card’s
P1 connector plugs into the Main Electronics Board at P3, activating Comm1.
The defaults for the dial-up modem communications card are: 2400 baud rate, 8 data bits, 1 stop bit,
no parity, 10 millisecond Key On Delay, and 10 millisecond Key Off Delay. On power up, the modem
must be set up for Auto Answer. Periodic checks are made to ensure that the modem is still in Auto
Answer or that it is not left off the hook after a certain period of non-communication.
DOC0276A
Figure 3-3. Dial-up Modem Communications Card
RJ11 Connector
Mating Connector
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