Epson ESC/VP21 User Manual page 73

Finding the Source of Transmission Errors
A failure in modem communication is usually characterized by
unacceptably high error rates or a total inability to communicate; it
may be the fault of the local computer or terminal, the local modem,
the telephone line, the remote modem or terminal. Figure 5-1
gives an algorithm for finding the source of errors.
If you have any further questions or problems, please contact your dealer.
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TROUBLESHOOTING GUIDE - 5