Data/Fax/Voice Modem User Guide MT5600DSVD, MT5600DSDV2
MultiModemDSVD User Guide 5 Solving Problems
58
Multi-Tech Systems, Inc.
TT
TT
T
he Modhe Mod
he Modhe Mod
he Mod
em Cannotem Cannot
em Cannotem Cannot
em Cannot
C C
C C
C
oo
oo
o
nnenne
nnenne
nne
ctct
ctct
ct
WW
WW
W
henhen
henhen
hen
AnsAns
AnsAns
Ans
ww
ww
w
erer
erer
er
inging
inging
ing
✔✔
✔✔
✔
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 File
File File
File
TrTr
TrTr
Tr
ansfansf
ansfansf
ansf
erer
erer
er
Is Slo Is Slo
Is Slo Is Slo
Is Slo
ww
ww
w
erer
erer
er
TT
TT
T
han Ihan I
han Ihan I
han I
tt
tt
t
Should Be Should Be
Should Be Should Be
Should Be
✔✔
✔✔
✔
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.
✔✔
✔✔
✔
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 Ymo-
dem/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 en-
abled? 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 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.
✔✔
✔✔
✔
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.
DD
DD
D
aa
aa
a
tt
tt
t
a Is Being Loa Is Being Lo
a Is Being Loa Is Being Lo
a Is Being Lo
stst
stst
st
✔✔
✔✔
✔
If you are using data compression and a high speed serial port, set the serial port
baud rate to four times the data rate.
✔✔
✔✔
✔
Your UART might 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.
✔✔
✔✔
✔
Make sure the flow control method you selected in software matches the method
selected in the modem. If you are using the modem with a Macintosh, you might
have the wrong cable for hardware flow control.