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Articles by Samual Sam
Page 34 of 151
Medium Access Control Sublayer (MAC sublayer)
The Medium Access Control (MAC) sublayer is a critical component of the data link layer in the OSI reference model. It manages how devices access and share transmission media, controlling data flow and preventing collisions in shared network environments. The MAC sublayer acts as an intermediary between the upper layers and the physical transmission medium, ensuring orderly and efficient data transmission across networks like Ethernet, Wi-Fi, and other shared media technologies. MAC Layer in the OSI Model The data link layer (Layer 2) of the OSI model is divided into two distinct sublayers: Logical ...
Read MoreAssumptions for Dynamic Channel Allocation
Dynamic channel allocation schemes are methods for allotting shared network channels to competing users in a dynamic manner based on their requirements. The users may be base stations, access points, or terminal equipment that receive channels from a central pool. These allocation methods operate under specific assumptions that define how the network behaves and how resources are managed. Understanding these assumptions is crucial for implementing effective dynamic channel allocation algorithms. Core Assumptions Independent Traffic It is assumed that users operate independently of each other. Each user generates and transmits data that is unrelated to other users' ...
Read MoreStructure of the Telephone System
The telephone system is organized as a highly redundant, multilevel hierarchy designed to provide reliable voice communication across vast distances. This hierarchical structure ensures efficient call routing and redundancy for uninterrupted service. Components of the Telephone System Subscriber telephone − The end user device that initiates or receives calls End office − Local central office directly connected to end users within a 1-10 km radius Local loop − A two-way connection between the subscriber's telephone and the end office Toll office − Switching centers that handle long-distance calls; called tandem ...
Read MoreTelephone Modems
A modem is an abbreviation of "modulator demodulator". It is a network device that modulates digital information or bits into analog signals for transmission at the sending end, and demodulates the analog signals back to bits at the receiving end. Telephone modems enable data communication between two computers over voice-grade telephone lines. Purpose and Usage Computers are digital devices that need to communicate over the analog local loops of telephone networks. There is a need to convert digital bits to analog signals for transmission over physical telephone channels, and conversely convert analog signals back to computer-understandable bits. A ...
Read MoreFirst-Generation (1G) Mobile Phones
First-generation (1G) mobile phones marked the beginning of wireless cellular technology, introducing the world's first commercial mobile communication system. It was an analog telecommunications system that revolutionized personal communication by making voice calls possible from virtually anywhere within network coverage. 1G technology operated from 1979 to the mid-1980s, establishing the foundation for all modern mobile communication systems that followed. 1G Cellular Network Architecture Cell A Cell B Cell C BS ...
Read MoreData Over Cable Service Interface Specification (DOCSIS)
Data Over Cable Service Interface Specification (DOCSIS) is an international telecommunications standard that enables high-speed data transmission over existing cable TV infrastructure using Hybrid Fiber-Coaxial (HFC) networks. DOCSIS allows cable operators to provide broadband Internet access and support high-definition television services through the same coaxial cables used for traditional cable TV. DOCSIS transforms cable TV networks into bidirectional data communication systems, enabling millions of homes to access high-speed Internet without requiring new infrastructure deployment. DOCSIS Cable Network Architecture CMTS (Head-end) ...
Read MoreAdvanced Mobile Phone System
The Advanced Mobile Phone System (AMPS) was a standard for analog cellular phone systems developed by Bell Labs and officially introduced by AT&T in 1983. It was the first widespread cellular technology in North America and became the foundation for modern mobile communications. Key Features of AMPS Analog technology − Based on the initial electromagnetic spectrum allocation for cellular service by the Federal Communications Commission (FCC). Frequency Division Multiple Access (FDMA) − Allows multiple simultaneous conversations by assigning different frequency channels to each user. Frequency allocation − Operates within the 800 and ...
Read MoreCircuit-switched vs Packet-switched networks
Circuit-switched networks are connection-oriented networks where a dedicated route is established between the source and destination before data transmission begins. The entire message travels through this fixed path. Packet-switched networks are connectionless networks where messages are divided into small units called packets that are individually routed from source to destination, potentially taking different paths. Circuit-Switched vs Packet-Switched Networks Circuit Switching A B Dedicated Path ...
Read MoreFrequency Division Duplex
Frequency Division Duplex (FDD) is a communication technique where two parties can communicate with each other in both directions simultaneously by using separate frequency bands for transmitting and receiving data. Since FDD uses different frequency bands for upstream data and downstream data, the sending and receiving signals do not interfere with each other. This separation allows for continuous, full-duplex communication without the need for time-based coordination between transmitter and receiver. Frequency Division Duplex (FDD) Base Station ...
Read MoreCable, ADSL, and Fiber
Cable, ADSL, and Fiber are three major broadband technologies that deliver internet connectivity to homes and businesses. Each technology uses different physical mediums and offers distinct advantages and limitations for data transmission. Cable internet utilizes the existing coaxial cable infrastructure originally deployed for television broadcasting. ADSL (Asymmetric Digital Subscriber Line) leverages existing telephone copper wire networks to provide broadband services. Fiber optic internet uses light signals transmitted through glass or plastic fiber cables to deliver ultra-high-speed connectivity. How Each Technology Works Cable networks share bandwidth among users in a neighborhood through a coaxial cable infrastructure. The shared ...
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