Error Correction in Data Transmission

Questions and Answers

What is the purpose of interleaving in error correction?

To combine Hamming distance and error correction

To provide flow control at the data-link layer

To send bits column by column to correct burst errors (correct)

To create n-bit packets that can correct t-bit errors

What is the main function of the data link control (DLC) layer?

To provide security features for data transmission

To provide routing information for packets

To manage network congestion and packet loss

To deal with procedures for communication between two adjacent nodes (correct)

What is the purpose of framing in the Data-Link layer?

To provide error control at the data-link layer

To provide routing information for packets

To pack bits into frames, so that each frame is different from another (correct)

To manage flow control at the data-link layer

What is the issue with using any character as a flag in Connection-Oriented Framing?

The flag can also be a part of the data Signup and view all the answers

What is the purpose of Byte Stuffing in Connection-Oriented Framing?

To avoid confusing the receiver by using flags as data Signup and view all the answers

What is the delimiter used in Bit-Oriented Framing?

A special 8-bit pattern (01111110) Signup and view all the answers

What are the two main responsibilities of the data-link control sub layer?

Flow control and error control Signup and view all the answers

What is the advantage of compounding high and low-resolution packets?

It provides a way to send high-resolution data with low-resolution redundancy Signup and view all the answers

Study Notes

Error Correction Techniques

Hamming distance and interleaving can be combined to correct burst errors up to m × t bits.
Interleaving involves sending bits of n-bit packets column by column, where each packet can correct t-bit errors.

Compounding High & Low Resolution Packets

A duplicate of each packet with low-resolution redundancy is created and combined with the next packet.
For example, four low-resolution packets can be created out of five high-resolution packets and sent.

Data Link Control (DLC) Services

DLC deals with procedures for communication between two adjacent nodes in dedicated or broadcast links.
DLC functions include framing, flow control, and error control.

Framing

Framing involves packing bits into frames to make each frame distinguishable from another.
Framing separates a message by adding a sender address and a destination address.
Frames can be of fixed size or variable size.

Frame Size

Using one big frame is not practical, so frames are broken down into smaller sizes.

Connection-Oriented Framing

Connection-oriented framing uses text characters as flags.
Byte stuffing is used to avoid confusing the receiver when a flag character is also part of the data.

Bit-Oriented Framing

Data section of a frame is a sequence of bits.
A special 8-bit pattern (01111110) is used to define the beginning and end of a frame.

Flow and Error Control

Flow control ensures a balance between production and consumption rates to prevent frame discarding.
Buffers are used at the sending and receiving ends to manage flow control.
Error control at the data-link layer uses CRC to silently discard corrupted frames or send acknowledgments for good frames.

Description

This quiz covers the concepts of Hamming distance, interleaving, and compounding high and low resolution packets in data transmission. It explains how to correct burst errors and create redundant packets for error correction.