A T&T PARADYNE DATAPORT

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: 1998/10/12 20:47:51 $

  There is an FAQ specifically for AT&T modems.
  This modem is recommended for use with HylaFAX only when used in Class 1.

CLASS 1 SUPPORT

- 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

CLASS 2 SUPPORT

- 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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