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Articles by Chandu yadav
Page 15 of 81
Fiber Optics vs Satellites
Fiber optic communications and satellite communications are complementary to each other. Their properties are very different from one another and consequently their usage varies. Fiber Optics vs Satellites Satellite Communication ✓ Remote areas ✓ Broadcasting ✓ Mobile communication ...
Read MoreThe Electromagnetic Spectrum
The electromagnetic spectrum is the entire range of electromagnetic radiation arranged according to wavelength or frequency. It spans frequencies from 1 Hz to 1024 Hz. The waves in order of increasing frequency are radio waves, microwaves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays. Among this range, frequencies between 104 Hz to 1015 Hz are primarily used for communication. The Electromagnetic Spectrum 10⁰ Hz 10⁶ Hz 10¹² Hz 10¹⁵ Hz ...
Read MoreTrunks and Multiplexing
A trunk is a high-capacity communication channel that connects switching centers, forming the backbone of telecommunication networks. Trunks are designed to carry large volumes of voice and data traffic simultaneously over long distances using multiplexing techniques. Unlike local loops that connect individual subscribers to the nearest switching office, trunks handle the bulk transmission of aggregated traffic between network nodes. They represent the core infrastructure that enables telecommunications networks to scale efficiently. Trunk Network Architecture End Office A (Local Switch) ...
Read MorePulse Code Modulation
Pulse Code Modulation (PCM) is a technique for digitally representing analog signals. It takes samples of the amplitude of the analog signal at regular intervals and converts them to binary data. PCM is widely used by codecs in telephone networks to convert analog signals in local loops to digital signals in the trunks, and performs reverse conversion at the receivers' end. How PCM Works PCM operates through three fundamental steps: sampling, quantization, and encoding. These processes convert continuous analog signals into discrete digital representations that can be transmitted and stored efficiently. PCM Process ...
Read MoreEnhanced Data rates for GSM Evolution (EDGE)
Enhanced Data rates for GSM Evolution (EDGE) is an improved version of GSM providing higher data transmission rates while maintaining backward compatibility with existing GSM infrastructure. EDGE represents a significant step in the evolution of mobile data services, bridging the gap between 2G and 3G technologies. EDGE was standardized by 3GPP as part of the GSM family and commercially deployed in GSM networks starting in 2003. It is also known as Enhanced GPRS (EGPRS) and IMT-Single Carrier (IMT-SC). GSM to EDGE Evolution GSM GMSK Modulation ...
Read MoreFletcher's Checksum
Fletcher's checksum is an error-detection technique that uses two checksums to determine single-bit errors in a message transmitted over network channels. It is a block code technique that was devised by John G. Fletcher in the 1970s at Lawrence Livermore Labs, USA. The checksums are created based on the data values in the data blocks to be transmitted and appended to the data. When the receiver gets this data, the checksums are re-calculated and compared with the existing checksums. A non-match indicates an error. The error-detection capabilities of this method are nearly the same as that of Cyclic ...
Read MoreVoice over LTE (VoLTE)
Voice over LTE (VoLTE) is a standard for delivering voice communication and data services over 4G LTE networks using an all-IP architecture. Unlike traditional voice calls that use circuit-switched networks, VoLTE transmits voice as data packets over the LTE data network. VoLTE leverages the IP Multimedia Subsystem (IMS) to provide high-quality voice, video, and messaging services. This technology enables faster call setup times, better voice quality, and the ability to use voice and data services simultaneously. How VoLTE Works VoLTE operates entirely on packet-switched technology, converting all voice communications into IP packets. When a user makes a ...
Read MoreWhat are the headers used in a Data Link Layer?
The Data Link Layer uses headers to control frame transmission and ensure reliable communication between directly connected nodes. These headers contain essential control information that enables proper frame delivery, sequencing, and error handling. Data Link Layer Frame Structure A frame is the unit of communication in the data link layer. The data link layer encapsulates packets from the Network Layer into frames, adding necessary control information through headers. If frames become too large, packets may be divided into smaller frames for efficient transmission. Data Link Layer Frame Structure ...
Read MoreCable Modems
A cable modem is a hardware device that connects a computer to an Internet Service Provider (ISP) through the local cable TV infrastructure. It serves as a bridge between your home network and the cable company's broadband network, enabling high-speed internet access over coaxial cables. Cable modems have two interfaces: one connects to the cable TV network outlet, and the other connects to a computer, router, or other network device through Ethernet or USB. Cable Modem Connection Overview Cable TV Network ...
Read MoreA Simplex Stop-and-Wait Protocol for an Error-Free Channel
Stop-and-Wait protocol is a data link layer protocol for transmission of frames over noiseless channels. It provides unidirectional data transmission with flow control facilities but without error control facilities. This protocol takes into account the fact that the receiver has a finite processing speed. If data frames arrive at the receiver's end at a rate greater than its processing rate, frames will be dropped. To avoid this, the receiver sends an acknowledgement for each frame upon arrival. The sender transmits the next frame only after receiving a positive acknowledgement confirming the receiver is ready for further data processing. ...
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