Modem Terminology Overview
Modem Terminology Overview - Page
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SPOT 14.4
SPOT 14.4 User's Guide
User's Guide
38GDE00001SCF - Issue 4 (11/96)
38GDE00001SCF - Issue 4 (11/96)
File Transfer
File Transfer
Modems transfer files between each other in blocks of data using transfer
protocols such as XModem, YModem, ZModem, Kermit, etc. These
determine the block length, type of error detection used and whether
filenames have to be stipulated or are automatically transmitted with the
data.
There are several variants of the XModem protocol, with YModem being
a direct descendant of XModem. However, ZModem is the best 'general
purpose' protocol, as it is a multiple file transfer protocol and therefore the
most suitable for unattended operation.
In addition to the above protocols you can also send and receive
straightforward, unchecked, ASCII files (text files).
Terminal Emulation
Terminal Emulation
It has already been mentioned that you can access mainframe computers
via the modem; that was how we obtained the term Data Terminal
Equipment. To make this connection easier, communications software
usually contains several 'Terminal Emulation' options. These are
mini-programs that you can run to make your machine appear like the
type of terminal normally connected to the mainframe.
By making your computer emulate a particular type of terminal the
software sets up the correct control codes that are passed to the
mainframe during dial-up and answering, and informs your terminal how
to handle certain control characters.
