Multi-Tech Systems MT5600ZDX - Manual (Page 23)

23
Owner’s Manual
4 If you have extension phones on the same line as your modem, you or someone
else can interrupt the connection by picking up another phone. If this is a frequent
problem, disconnect the extension phones before using the modem, or install
another phone line especially for the modem.
4 Check for loose connections between the modem and the computer, the
telephone jack, and AC power.
4 You may have had a poor connection because of line conditions or the problem
may have originated on the other end of the line. Try again.
4 If you were online with a BBS, it may 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 Modem Cannot Connect When Answering
4 Auto-answer may be disabled. Turn on auto-answer in your datacomm program
or send the command ATS0=1 to your modem in terminal mode.
Slow File Transfer
4 You may have an older UART. For best throughput, install a 16550AFN UART or
a Multi-Tech ISI serial port card.
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 or Kermit, 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
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.
4 Try entering the &V (View Parameters) command, making a screen print of the
diagnostics listing, and checking for parameters that may be unacceptable.
Losing Data
4 If you are using data compression and a high speed serial port, set the serial port
baud rate to four times the data rate.
4 Your UART may not be reliable at serial port speeds over 9600 bps or 19,200 bps.
Turn off data compression, reset your serial port speed to a lower rate, or replace
your serial port with a faster one.