87
you do not have to include it in each directory entry. To change the dial prefix
in Windows HyperTerminal, select Connect from the Call menu, click Dialing
Properties
, and type 9 in the local and long distance boxes in “How I dial from
this location.”
✔
If the modem reports NO ANSWER, the other system has failed to go off-hook,
or you might have dialed a wrong number. Check the number.
✔
If the modem reports NO CARRIER, the phone was answered at the other
end, but no connection was made. You might have dialed a wrong number,
and a person answered instead of a computer, or you might have dialed the
correct number but the other computer or software was turned off or faulty.
Check the number and try again, or try calling another system to make sure
your modem is working. Also, try calling the number on your telephone. If
you hear harsh sounds, then another modem is answering the call, and the
modems might be having problems negotiating because of modem
incompatibilities or line noise. Try connecting at a lower speed.
✔
Poor line conditions can affect the connection. When using V.34 or V.32
client-to-client connections in poor conditions, setting S38=0 may result in
better performance.
9.1.4 T
HE
M
ODEM
D
ISCONNECTS
W
HILE
O
NLINE
✔
If you are not using Modem on Hold, Call Waiting can interrupt your
connection when someone tries to call you. If you have Call Waiting service,
disable it before each call. In most telephone areas in North America, you can
disable Call Waiting by preceding the telephone number with *70 (but first
check with your local telephone company). You can automatically disable Call
Waiting by including the disabling code in the modem’s dial prefix (for
example, ATDT*70,—note the comma, which inserts a pause before the
number is dialed). To change the dial prefix in Windows HyperTerminal,
select Connect from the Call menu, click Dialing Properties, check “This
location has Call Waiting,” and select the correct code for your phone service.
To learn more about Modem on Hold, see Chapter 8.
✔
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.
✔
Check for loose connections between the modem and the computer, the
telephone jack, and AC power.
CHAPTER 9: Troubleshooting
