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Manufacturer: AT&T Paradyne
Model: 3710-Ax (aka DataPort)
Latest Firmware Revision Tried: 1.76.00
Recommended Firmware Revisions: 1.76.00
Last Updated: Date: 1995/02/20 01:16:11 $


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There is an FAQ specifically for AT&T modems.

This modem is recommended for use with HylaFAX only when used in Class 1.

• received HDLC frames do not include the FCS bytes (revs prior to 1.33)
• carrier is sometimes dropped w/o notice during receive (rev 1.33)
• the command "ATH+FCLASS=0;A" does not do the right thing because the command parser does not parse the ";A"
• the modem returns "OK" instead of "NO CARRIER" or "NO ANSWER" when a dial attempt times out before carrier is established

• Result strings for AT+FDCC=? and AT+FDIS=? are semantically incorrect; ranges are returned as (a,b) instead of (a-b); e.g. (0,5) instead of (0-5) for signalling rate; this causes problems in deducing the true set of modem capabilities (old firmware revs)
• The modem sends the host ^S/^Q during page data transmission (AT+FDT) even when RTS/CTS flow control is enabled.
• Prior to rev 1.76 it was not possible to disable copy quality checking (AT+FCQ=0 failed).
• There is no support for transmission of 2D-encoded data
• In certain revisions, the modem was observed to enter a state where it repeatedly sent EOP when commanded to send MPS (for AT+FET=0); power-cycling the modem cleared this condition
• In certain revisions prior to 1.76, when transmitting, the modem drops page data (due to improperly priming the datapump).
• The modem returns "OK" instead of "NO CARRIER" or "NO ANSWER" when a dial attempt times out before carrier is established
• In firmware revision 1.76, AT+FREV? can return gibberish that causes the fax software to be unable to initialize the modem; to workaround the problem set the ModemRevQueryCmd configuration parameter to "!C01.1.76" (so the command is not sent to the modem).

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