Please Whitelist This Site?

I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)

If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.

If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.

Thanks for your understanding!

Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide


NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.

The Book is Here... and Now On Sale!

The whole site in one document for easy reference!
The TCP/IP Guide

Custom Search







Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  TCP/IP Key Applications and Application Protocols
           9  TCP/IP File and Message Transfer Applications and Protocols (FTP, TFTP, Electronic Mail, USENET, HTTP/WWW, Gopher)
                9  TCP/IP General File Transfer Protocols (FTP and TFTP)
                     9  File Transfer Protocol (FTP)
                          9  FTP Concepts and General Operation

Previous Topic/Section
FTP General Data Communication and Transmission Modes
Previous Page
Pages in Current Topic/Section
12
3
Next Page
FTP Commands and Replies
Next Topic/Section

FTP Data Representation: Data Types, Data Structures and Format Control
(Page 3 of 3)

FTP Format Control

For the ASCII and EBCDIC types, FTP defines an optional parameter called format control. This allows a user to specify a particular representation for how vertical formatting is used to describe a file. The three options are:

  • Non Print: The default, indicating no vertical formatting.

  • Telnet Format: Indicates that vertical format control characters, as specified in the Telnet protocol, are used in this file.

  • Carriage Control / FORTRAN: The file uses format control characters given as the first character of each line, as specified for the FORTRAN programming language.

The format control option was created for the particular purpose of properly handling files transferred from host devices to printers. It is not used today, to my knowledge (or if it is used, it is only in special applications.)

FTP Data Structures

In addition to specifying a file's data type, it is also possible to specify the file's data structure. There are three possibilities:

  • File Structure: The file is a contiguous stream of bytes with no internal structure.

  • Record Structure: The file consists of a set of sequential records, each of which is delimited by an end-of-record marker.

  • Page Structure: The file contains a set of special indexed data pages.

The file structure is the default and is used for most types of files. The record structure can be used for ASCII text files, but these are more commonly sent with the regular file structure using the ASCII data type. The page structure is not commonly used; I believe it was initially created for a now archaic type of computer used in the early ARPAnet.

 


Previous Topic/Section
FTP General Data Communication and Transmission Modes
Previous Page
Pages in Current Topic/Section
12
3
Next Page
FTP Commands and Replies
Next Topic/Section

If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005

© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.