Table 2-15 Continued

 

Problem

Possible Cause

Solution

 

Modem does not dial

Telephone number is not

■ Make sure the telephone

 

 

correctly.

entered correctly in the

number you dialed is correct if

 

 

modem’s dialing software.

you are using the dialing

 

 

 

directory or the terminal mode.

 

 

 

■ Dial 1 if using dialing long

 

 

 

distance.

 

 

 

■ The other line could be busy or

 

 

 

not answering.

 

 

 

■ Make sure call waiting is

 

 

 

disabled.

 

 

 

■ The modem may not recognize

 

 

 

an international dial tone. Try

 

 

 

the ATX3DT command and the

 

 

 

telephone number.

 

Characters are

There is noise in the

■ Check your telephone and

 

 

garbled/transfer rates are

telephone line.

modem cable connections. If

 

slow.

 

they are a little loose, they

 

 

 

can cause noise on the line.

 

 

 

■ Check with your local

 

 

 

telephone company for a

 

 

 

phone line filter.

 

Phone line noise causing a

Hang-up Delay S Register

Change S10 default to 150.

 

 

disconnection.

(S10) set too low.

To set S10=150:

 

 

 

1.Select Start ￿ Programs ￿

 

 

 

Accessories ￿ HyperTerminal,

 

 

 

then go to Command Mode.

 

 

 

2.Type ATS10=150 and press

 

 

 

Enter.

 

 

 

This command causes the modem

 

 

 

to take longer to disconnect

 

 

 

even if there is noise on the line.

 

No dial tone

Phone service is not

Verify that service from the local

 

 

 

connected to the telephone

phone company by following

 

 

wall jack.

these steps:

 

 

 

1.Unplug the telephone cable

 

 

 

from the telephone wall jack.

 

 

 

2.Connect a telephone to the

 

 

 

jack, pick up the handset, and

 

 

 

listen for a dial tone. If there is

 

 

 

a dial tone, reconnect the

 

 

 

modem to the telephone wall

 

 

 

jack with the telephone cable

 

 

 

and make sure all connections

 

 

 

are secure.

 

 

 

3.If there is still no dial tone,

 

 

 

contact your local phone

 

 

 

company or building manager.

 

 

The modem is not responding

Verify the modem and computer

 

 

 

to commands from the

are connected:

 

 

computer keyboard.

1.Select Start ￿ Programs ￿

 

 

 

Accessories ￿ HyperTerminal,

 

 

 

then go to Terminal Mode.

 

 

 

2.Type AT and press the Enter

 

 

 

key. If the modem displays

 

 

 

OK, the modem and computer

 

 

 

are working together. If the

 

 

 

modem displays ERROR, or

 

 

 

does not respond, restart the

 

 

 

computer and repeat step 1.

 

 

 

3.Type ATDT and listen for dial

 

 

 

 

 

2-20Troubleshooting