1. DATA COMMUNICATION
Lecture-36

2. Recap of Lecture 35
Checksum
Single-Bit Error Correction

3. Overview of Lecture 36 Hamming Code Data Link Control Line Discipline
ENQ/ACK
POLL/SELECT
Flow Control

4. Hamming Code
Each r bit is the VRC bit for one combination of data bits
r1(r2) bit is calculated using all bit positions whose binary representation includes a 1 in the first(second) position, and so on

5. Hamming Code

9. Data Link Layer Functions

10. Data Link Layer Functions

11. Line Discipline
The line discipline functions of the data link layer oversee
The establishment of link
The right of a particular device to transmit at a given time

12. Line Discipline Line discipline can be done in two ways ENQ/ACK
(peer-to-peer communication)
Poll/select
(primary-secondary communication)

13. Line Discipline

14. Summary Hamming Code Data Link Control Line Discipline ENQ/ACK
POLL/SELECT
Flow Control

15. Suggested Reading
Section 9.7, 10.1 “Data Communications and Networking” 2nd Edition by Behrouz A. Forouzan