TECHNICAL BULLETIN #53 - Rev 1.10 (9/03/96)

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TITLE   : Incomplete File Transfers:  "No Carrier"
PRODUCT : Procomm Plus
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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, you may 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 can 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 CD monitoring during file transfers for
Procomm Plus.

 1. At the Terminal window, click Setup | Data | Data Options | Advanced.

 2. If the Abort transfer if CD lost checkbox is checked, then click within
    the Abort transfer if CD lost checkbox to disable the feature and click
    on the OK push-button to accept the new setting.

 3. Retry your download.

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           Copyright (c) 1996 Quarterdeck  All rights reserved.
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