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Knowledge Database

KB #8841 - Transmission error 51, 52, 54 or 55 with US-Robotics and 3Com modems

Problem Description

When sending faxes with US-Robotics and 3Com modems the transmission error 51, 52, 54 or 55 occurs.

Solution

This is a known problem that is caused by a bug in the modem software (firmware). This problem typically occurs with certain types of US-Robotics and 3Com modems. You usually can solve this by running the modem in fax class 1 mode.
The modem does not detect the acknowledgement signal for a successful page transmission from the remote fax machine when this error happens, so the fax is transmitted multiple times, depending on the number of transmission attempts configured in ActFax.
More information about running the modem in fax class 1 mode can be found at Knowledge Base Article #9462.