AT&T 585-300-903 manual DIP Switch Settings, Mixing Modem Types and Modes

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
		⎜		⎜		⎜		⎜
⎜	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.

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Yes2 — all tested cases passed except 3296 (FS @ 4800) to a 424 (MNP @ 19.2K) fails. Calls from the 424 to the 3296 passed.