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Questions and Answers
What is the purpose of interleaving in error correction?
What is the purpose of interleaving in error correction?
What is the main function of the data link control (DLC) layer?
What is the main function of the data link control (DLC) layer?
What is the purpose of framing in the Data-Link layer?
What is the purpose of framing in the Data-Link layer?
What is the issue with using any character as a flag in Connection-Oriented Framing?
What is the issue with using any character as a flag in Connection-Oriented Framing?
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What is the purpose of Byte Stuffing in Connection-Oriented Framing?
What is the purpose of Byte Stuffing in Connection-Oriented Framing?
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What is the delimiter used in Bit-Oriented Framing?
What is the delimiter used in Bit-Oriented Framing?
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What are the two main responsibilities of the data-link control sub layer?
What are the two main responsibilities of the data-link control sub layer?
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What is the advantage of compounding high and low-resolution packets?
What is the advantage of compounding high and low-resolution packets?
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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.
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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.
