4-13-94                 Checking for Conflicts

     An external modem has no comport. It uses the serial port you plug  it
into.  There can be NO internal devices sharing the port you plu the  modem
into. Most computers come with serial ports 1 & 2. The mouse commonly is on
serial 1, so the modem plugs into serial (com) 2.

      In Terminal mode can you type AT and get an OK reply? If not then the
modem either isn't displaying the echo or not getting the command. Try  ATA
and  see  if  you  hear the modem pick up  the  telephone  line  and  start
squealing.  If it does, the modem is getting and responding to the  command
and probably is OK and there is a computer hardware/driver conflict (modem,
mouse,  scanner and so forth). The RD/SD LEDs should blink breifly  as  you
type  commands. If only the SD blinks the modem is probably defective.  The
MR is Modem Ready and should come on with power on.

     If  the RD/SD lights are on steady then most likely it is a  defective
cable or wrong (null-modem) cable, although it's also a possible  defective
serial port. Some cables used with old 1200/2400 modems also will not work,
as  they have too few wires inside for hardware control of a v42bis  modem.
If  you have Mac you cannot use a printer cable (though they look the  same
as  a modem cable) and it must be a hardware flow cable or universal  cable
for any V-series modem.

     If  none  of  these produce any response, the  modem  most  likely  is
defective.
                                   Don Hinds - Zoom Tech
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