Troubleshooting

 

Table C-3

 

(2 of 2)

 

Modem – VF Connection

 

 

Symptom

Action

 

 

Originate Mode

Verify that the modem’s DTE Dialer configuration option is set to the correct setting: either AT,

 

DTR Dialing, V.25bis Async, V.25bis Bisync, or V.25bis HDLC.

 

 

Modem does not go

If using AT Dialing, refer to the Table C-2, Modem – DTE Connection.

off-hook and begin

If using DTR Dialing, verify the telephone number stored in directory location 1, and verify that

dialing

the DTE is raising DTR from Off to ON to initiate a dial.

 

 

If using V.25bis Async, verify that the correct character format is set to 7 data bits with even

 

parity and 1 stop bit, and the carriage return and line feed are used as command terminators.

 

If using V.25bis Bisync, verify that the correct character format uses two synchronous control

 

characters and a start-of-text control character before the text block and an end-of-text control

 

character after the text block.

 

If using V.25bis HDLC, verify that the correct character format uses flag, address, and control

 

characters before the text block and a frame sequence check and flag after the text block.

 

 

Modem dials but does

If the modem is operating behind a PBX, verify if a 9 and comma are needed before the

not connect

telephone number.

 

Verify whether Tone or Pulse dialing is needed.

 

Verify if one modem is configured for Error Control or Disconnect and the other modem is

 

configured for no Error Control. Try calling in Buffer mode.

 

If both modems use V.32bis or V.32 modulation, set the modem’s V.32bis Train configuration

 

option to Long.

 

 

Intermittent disconnects,

Perform an End-to-End test. Refer to the Pattern section of Chapter 8, Test Branch.

high error rates, or

 

excessive

 

retransmissions

 

 

 

Modem establishes and

You may have a poor VF connection. Disconnect and dial again.

disconnects a call

The remote modem may have encountered an EC Disconnect, where the modem is

 

 

configured to establish a call using error correction. If the modems cannot negotiate EC, then

 

a disconnect occurs.

 

The remote modem may be in a forced Error Control mode (disconnect if there is no error

 

control). Reconfigure your modem to V.42/MNP or Buffer and try again.

 

Check the LCD to verify the reason for disconnect.

 

Perform a Local Analog Loopback test.

 

 

High error rates occur

Incoming rings can cause data errors during a loopback test. Abort the test, disconnect the

when running a local

modular VF cord, and restart the test.

loopback or self-test

 

 

 

3810-A2-GB30-30

September 1998

C-3

Page 176
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Paradyne 3800 manual Troubleshooting

3800 specifications

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