Multitech MULTI MODEM II MT5600BA - Manual (Page 82)

8 Solving Problems
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MultiModemII User Guide
4 Check for loose connections between the modem and the computer, the tele-
phone jack, and AC power.
4 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.
4 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 ex-
ceeded your time limit for the day. Try again.
The Modem Cannot Connect When Answering
4 The default DTR Control command (&D2) inhibits autoanswer. To enable au-
toanswer, change 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 infor-
mation on changing the modem’s default configuration, see “Step 3: Install and
Configure Your Software” in Chapter 2.
4 Autoanswer might be disabled. Turn on autoanswer in your datacomm program
or send the command ATS0=1 (ATS0=2 if you have Caller ID service) to your
modem in terminal mode.
File Transfer Is Slower Than It Should Be
4 You might have an older UART. For best throughput, install a 16550AFN UART
or a Multi-Tech ISI serial port card. See the “Quick Start” chapter for information
on how to identify your UART.
4 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.
4 If you are using a slow transfer protocol, such as Xmodem, try Zmodem or
Ymodem/G instead.
4 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.
4 Are you downloading a compressed file with MNP 5 hardware compression en-
abled? Since hardware data compression cannot compress a file already compressed
by an archiving program, the transfer can be marginally slower with data com-
pression enabled than with it disabled.
4 Does your Internet service provider (ISP) use the same 56K protocol as your mo-
dem? 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.
4 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.