Character Oriented Framing

Duration: 4 min

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Inside: a video lesson and guided study material.

Module outline

  1. About Course: About the Course
  2. Paper 1 | General Studies: State Wise GK
  3. Paper 1 | Information and Communication Technology: Role of Internet and Web Services, Security in Mobile and Wireless Computing
  4. Paper 1 | Current Affairs: GK- Current Affairs
  5. Paper 2 | Discrete Mathematical Structure: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Probability
  6. Paper 2 | Digital Computer Organization And Architecture: Number System, Number Representation, Sequential Circuits, Combinational Circuit, Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Register Transfer and Microoperations, Control Unit Design, Programming the Basic Computer
  7. Paper 2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  8. Paper 2 | Programming Languages & Object-Oriented Programming Concepts: Java, OOPS with C++, Java Fundamentals, Array, String, IO & References
  9. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  10. Paper 2 | Data Structure And Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Minimum Spanning Trees, Advanced Algorithms
  11. Paper 2 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS
  12. Paper 2 | Theory Of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Complexity Theory
  13. Paper 2 | Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  14. Paper 2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Transaction Management, Concurrency Control, Database Recovery, Database Security & Authorization, Enhanced Data Models
  15. Paper 2 | Computer Network And Information Security: Introduction to CN, Data Communication, Application Layer, Hardware basics, Cyber Threats and Malware Attacks, Network Security, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP
  16. Paper 2 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  17. Paper 2 | Current Trends & Technologies: Emerging Tech Trends, Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Planning, Multi Agent Systems, Fuzzy Sets, Natural Language Processing, Artificial Neural Networks, Genetic Algorithms, Artificial Intelligence, Data Warehousing & Mining, Electronic Data Interchange and E-Commerce, Terms & Abbreviations
  18. Paper 2 | Full Length Mock Tests:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces character-oriented framing protocols used in data link layers for transmitting 8-bit characters. The instructor explains that frames consist of a Flag, Header, variable Data from the upper layer, and a Trailer. Flags are 8-bit sequences added at both ends to separate frames. A specific binary pattern, 01111110, is identified as a common flag. The lecture highlights the limitation of this method when non-text data like graphs or video is transmitted, as the flag pattern might appear within the actual data, causing the receiver to incorrectly identify frame boundaries.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video begins with a slide titled "Character-Oriented Protocols" showing a frame structure diagram. The instructor draws rectangular boxes on the screen to explain framing concepts, writing an "H" inside one box while pointing at the main diagram. The slide text states that headers carry control information and error detection bits, while data consists of 8-bit characters from coding systems like ASCII. The instructor illustrates that an 8-bit flag is added at both the beginning and end to separate frames, writing "1B" to indicate 8-bit flag size. He writes out the binary sequence "01111110" below the frame to demonstrate the specific flag pattern used for separation.

  2. 2:00 – 4:04 02:00-04:04

    The instructor discusses the limitations of character-oriented framing when transmitting non-text data such as graphs, audio, and video. He explains that if the flag pattern appears within the actual data, the receiver mistakenly identifies it as the end of the frame. To illustrate this problem, he writes a binary sequence "01111110" on the board, which represents a common flag pattern used in bit-oriented framing. The slide text notes that "any pattern used for the flag could also be part of the information," and if this happens, the receiver encounters this pattern in the middle of the data. The instructor emphasizes that character-oriented framing was popular when only text was exchanged, but modern applications require handling diverse data types.

The lecture establishes character-oriented framing as a method where 8-bit characters form the data payload, with flags marking frame boundaries. The core structure includes a Flag, Header, Data, and Trailer, where the flag is typically 01111110. A critical limitation arises because this specific binary pattern might occur naturally within the transmitted data, leading to synchronization errors. This issue necessitates more advanced framing techniques for non-text data transmission.

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