TECHNICAL BULLETIN #69 - Rev 1.00 (5/13/96)

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TITLE   : Incomplete File Transfers - "NO CARRIER"
PRODUCT : PROCOMM PLUS 2.01 (DOS)
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Normally, a progress window appears during a file transfer to display the
transfer's status.  If your file transfers are incomplete, and the progress
window displays a "No Carrier" message and then the window disappears, you
need to set PROCOMM PLUS to ignore the CD signal.  This document details how
to configure PROCOMM PLUS to ignore the signal during file transfers.

WHAT IS CARRIER DETECT?
Carrier Detect (CD) is a signal which is reported by your modem when it is
connected to another modem.  During normal operation, this signal will remain
constant while you are connected to another system.  However, conditions such
as noisy phone lines and faulty hardware can sporadically interrupt this
signal.

During a file transfer, PROCOMM PLUS can monitor the CD line and abort a file
transfer if the CD signal is interrupted.  When the file transfer is aborted,
PROCOMM PLUS will display a "No Carrier" message in the progress window and
the window will quickly disappear.  This feature is useful if you are not
using an error-correcting modem; CD interruptions are a good indicator that
data may be corrupted due to noisy lines or faulty conditions.  However, noise
will not hurt a file transfer if both systems are using error-correcting
modems.

In other conditions, monitoring the CD line is not advantageous.  Some users
connect to other systems directly using a null-modem cable instead of a modem
and phone line.  In these cases, the CD signal will not exist since CD is a
signal generated by a modem.  These users will never complete a file transfer
if PROCOMM PLUS monitors the CD signal during the transfer.

HARDWARE CONSIDERATIONS:
If you are using an external modem, there is an excellent chance you have
either a faulty serial cable or port which is not accurately reporting the
CD signal. In addition, 9 to 25 pin serial cable adapters are prime suspects
for losing signals in this situation. You may want to test this by replacing
the serial cable with a new one or attaching your modem to a different
serial port on your PC.

ABORT XFER IF CD LOST
The following procedure will disable PROCOMM PLUS' CD monitoring during file
transfers.

1. At the Terminal mode screen, press <Alt><S> to access the Setup Utility's
   main menu.

2. Press <P> to select "Protocol Options".

3. Press <G> to select "General Protocol Options".

4. Press <C> to edit the "Abort xfer if CD lost" field.

5. Press the spacebar to set it to "OFF".

6. Press <Enter> to accept the change.

7. Press <Esc> twice to return to the Setup Utility's main menu.

8. Press <S> to save the setting change.

9. Press <Esc> to return to Terminal mode and retry your download.

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