Free Trial

Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.


  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Chapter 5. Data Link Layer Concepts and ... > 22. Hold it! What is a modulo system...

22. Hold it! What is a modulo system and how is it used to number frames?

A modulo system is a mathematical system that cyclically repeats itself. For example, the set {0, 1, 2, 3} is a finite set that contains only the four given elements, namely, 0, 1, 2, and 3. This means that if we were to work with these set elements in sequence, after using the element 3, we must cycle back and start with 0. In general, a mathematical system that consists of the set of elements {0, 1, 2, 3,..., m - 1} is called a modulo or mod m system. Most sliding window protocols support either a three-bit or seven-bit window field. A three-bit field specifies a mod 8 system because 23 = 8, and a seven-bit field specifies a mod 128 system because 27 = 128.


  

You are currently reading a PREVIEW of this book.

                                                                                                                    

Get instant access to over $1 million worth of books and videos.

  

Start a Free Trial


  
  • Safari Books Online
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint