The Modem Cannot Connect When Answering; File Transfer Is Slower Than It Should Be - Multitech MultiModem MT5600ZDX User Manual

The Modem Cannot Connect When Answering

File Transfer Is Slower Than It Should Be

Check for loose connections between the modem and the computer, the phone
jack, and AC power.
You might have had a poor connection because of line conditions or the problem
might have originated on the other end of the line. Try again.
If you were online with a BBS or an online service like CompuServe, it might
have hung up on you because of lack of activity on your part or because you
exceeded your time limit for the day. Try again.
The default DTR Control command (&D2) inhibits autoanswer. To enable
autoanswer, change the DTR Control to &D0, and make sure &Q0, &Q1, &Q5,
or &Q6 is also set. For more information, see the &D command in Chapter 4. For
information on changing the modem's default configuration, see Chapter 3.
Autoanswer might be disabled. Turn on autoanswer in your data
communications program or send the command ATS0=1 (ATS0=2 if you have
Caller ID service) to your modem in terminal mode.
You might have an older UART. For best throughput, install a 16550AFN UART
or a Multi-Tech ISI serial port card. See the "Advanced Options" chapter for
information on how to identify your UART.
If you are running under Windows 3.1 and have a 16550AFN UART, you must
replace the Windows serial driver, COMM.DRV, to take full advantage of the
UART's speed.
If you are using a slow transfer protocol, such as Xmodem, try Zmodem or
Ymodem/G instead.
Is your line noisy? If there is static on your line, the modem has to resend many
blocks of data to insure accuracy. You must have a clean line for maximum speed.
Are you downloading a compressed file with MNP 5 hardware compression
enabled? Since hardware data compression cannot compress a file already
compressed by an archiving program, the transfer can be marginally slower with
data compression enabled than with it disabled.
Does your Internet service provider (ISP) use the same 56K protocol as your
modem? The default setting of your modem is to connect using either the
K56flex or the V.90 protocol, depending on which one the ISP modem is using. If
your ISP uses the X2 protocol, the maximum speed you will be able to connect at
is 33,600 bps. Check with your ISP to see which protocols it supports, and check
the Multi-Tech Web site for the latest developments in V.90.
Try entering the &V1 command to display information about the last connection,
making a screen print of the connection statistics, and checking for parameters
that might be unacceptable.
5 Troubleshooting
52