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MCA Articles
Page 25 of 95
Local Access and Transport Areas
In U.S. telecommunications, Local Access and Transport Area (LATA) refers to a geographical area allocated to telephone companies for providing local telecommunication services. These telephone companies are legally termed as Local Exchange Carriers (LECs). A LATA may be contained within a single U.S. state or may span across multiple states, as defined by the Telecommunications Act of 1996. LATAs serve as regulatory boundaries that determine which company can provide specific types of telecommunication services in different areas. LATA Structure and Connections LATA A ...
Read MoreNetwork Physical Layer
The Network Physical Layer is the lowest layer in the Open System Interconnections (OSI) model. The primary concern of this layer is transmission of individual bits from one node to another over a physical medium. In the TCP/IP model, the physical layer and the data link layer are combined as the host-to-network layer. Physical Layer in the OSI Model The Open System Interconnections (OSI) model is a layered networking framework that conceptualizes how communications should be done between heterogeneous systems. The physical layer is its lowest layer, responsible for the actual transmission of raw bits over physical ...
Read MoreWhat is bit stuffing in computer networks?
Bit stuffing is a mechanism used in data communication where one or more non-information bits are inserted into a message to prevent the data from being mistaken for control sequences, particularly frame delimiters. Purpose of Bit Stuffing In the Data Link layer, the stream of bits from the physical layer is divided into data frames. Variable-length frames require a specific bit pattern as a delimiter to mark frame boundaries. However, if this same pattern appears within the actual data, the receiver might incorrectly interpret it as a frame boundary. The two common approaches to solve this problem ...
Read MoreDifference between Byte stuffing and Bit stuffing
The differences between byte stuffing and bit stuffing are fundamental techniques used in data link layer framing to handle delimiter conflicts when transmitting data frames. What are Byte Stuffing and Bit Stuffing? Byte stuffing is a mechanism to convert a message formed of a sequence of bytes that may contain reserved values such as frame delimiters, into another byte sequence that does not contain the reserved values. This technique is also called character-oriented framing. Bit stuffing is the mechanism of inserting one or more non-information bits into a message to be transmitted, to break up the message ...
Read MoreForward Error Correction (FEC)
Forward Error Correction (FEC) is an error correction technique that detects and corrects a limited number of errors in transmitted data without requiring retransmission from the sender. In FEC, the sender adds redundant error-correcting bits to the original data frame before transmission. At the receiver end, these additional bits are used to perform error detection and correction. If errors are found within the correctable range, the receiver reconstructs the original data and removes the redundant bits before passing the message to upper layers. Forward Error Correction Process ...
Read MoreError Correcting Codes - Binary Convolutional Code
Errors occur when bits get corrupted during transmission over computer networks due to interference and network problems. Error-correcting codes (ECC) are sequences of numbers generated by specific algorithms for detecting and correcting errors in data transmitted over noisy channels. Error correcting codes determine the exact number of corrupted bits and their locations within the algorithm's limitations. ECCs are broadly categorized into two types: block codes and convolutional codes. Binary Convolutional Codes In convolutional codes, the message comprises data streams of arbitrary length, and output bits are generated by sliding application of Boolean functions to the data stream. ...
Read MoreError Correcting Codes - Reed-Solomon codes
Error-correcting codes (ECC) are mathematical algorithms used to detect and correct errors that occur when digital data is transmitted over noisy communication channels or stored in unreliable media. When bits are transmitted over computer networks, they are subject to corruption due to interference, noise, and various network problems. ECCs can detect the exact number and location of corrupted bits within the algorithm's limitations. They are broadly categorized into two types: block codes and convolutional codes. Reed-Solomon codes belong to the block code category. Reed-Solomon Codes Reed-Solomon (RS) codes are powerful error-correcting codes introduced in 1960 by Irving ...
Read MoreLow-Density Parity Check (LDPC)
Low-Density Parity Check (LDPC) codes are linear error-correcting block codes designed for correcting errors in large block sizes transmitted through very noisy channels. These codes provide excellent error correction performance while maintaining relatively low computational complexity. LDPC codes were developed by Robert G. Gallager in his doctoral dissertation at the Massachusetts Institute of Technology in 1960. Due to their inventor, these codes are also known as Gallager codes. Structure of LDPC Codes An LDPC code is specified by a parity-check matrix that contains mostly 0s and a low density of 1s. The rows of this matrix represent ...
Read MoreWhat are Error-Detecting Codes?
Error-detecting codes are a sequence of numbers generated by specific procedures for detecting errors in data that has been transmitted over computer networks. These codes add redundant information to data to help identify transmission errors at the receiving end. When bits are transmitted over computer networks, they are subject to corruption due to interference, noise, and network problems. The corrupted bits lead to spurious data being received by the receiver and are called errors. Error-detecting codes ensure messages are encoded before transmission over noisy channels. The encoding is designed so that the decoder at the receiving end can ...
Read MoreWhat is Interleaving?
Interleaving is a technique used to enhance existing error correcting codes so that they can perform burst error corrections more effectively. It works by rearranging data symbols before transmission to distribute burst errors across multiple codewords. Most error correcting codes (ECCs) are designed to correct random errors caused by additive noise that occurs independently. However, burst errors are errors that occur in sequences or groups, typically caused by defects in storage media or disruption in communication signals due to external factors like lightning. Interleaving modifies how data is organized after encoding by ECCs to handle these burst errors better. ...
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