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EIA RS-232 Cabling 8-7
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DIP Switch Settings
There are no required DIP switch settings for the 7400A or 7400B data sets. The AT&T Paradyne 3820 has
no dip switches.
For other modems supported by AT&T, the dip switches should be set as follows:
• For the AT&T Paradyne DM424 (or DL424), the dip switches in the rear of the modem should all be
UP.
• For the AT&T 2296A, the dip switches under the front panel should be set so 6 is UP; 1, 5, 7, and 8 are
DOWN.
• For the MICROCOM QX 3296/C, set the switches in one of the following ways:
— For MNP 19.2 Kbps mode, set the switches in the front of the modem so 1, 4, 5, 6, 7, and 9 are UP;
2, 3, and 8 are DOWN. Set the switches in the rear of the modem so 4, 5, and 6 are UP; 1, 2, 3, 7,
and 8 are DOWN.
— For non-MNP 9600 bps mode, set the switches in the front of the modem so 1, 4, 5, 6, 7, and 9 are
UP; 2, 3, and 8 are DOWN. Set the switches in the rear of the modem so 2, 4, and 5 are UP; 1, 3, 6,
7, 8 are DOWN.
Mixing Modem Types and Modes
The AT&T 2296A modem is not in the following table because the other modems are better alternatives. If
you do wish to a 2296A, set it up for non-MNP at 9600 bps or for MNP at 19.2 Kbps and try not to mix it
with other modem types.
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Tested Modem Combinations For RS-232 to RS-232 AUDIX Networking
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424 (FS) 424 (MNP) 3296 (FS) 3296 (MNP)
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424 (FS) yes yes yes1 yes
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424 (MNP) - yes yes2 yes
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3296 (FS) - - yes yes
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3296 (MNP) - - - yes
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FS — modem is in fixed speed mode. Tested speeds are 19.2K, 9600, and 4800 bps.
MNP — tested MNP speeds are 19.2K, 9600, and 4800 bps.
Yes1 — all tested cases passed except 3296 (FS @ 4800) to a 424 (FS @ 9600) fails. Calls from the 424 to
the 3296 passed.
Yes2 — all tested cases passed except 3296 (FS @ 4800) to a 424 (MNP @ 19.2K) fails. Calls from the
424 to the 3296 passed.