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Articles by Samual Sam
Page 35 of 151
Digital Advanced Mobile Phone System
Digital Advanced Mobile Phone System (D-AMPS) is a digital version of Advanced Mobile Phone Systems (AMPS), the original analog standard for cellular phones. D-AMPS uses a combination of Time Division Multiple Access (TDMA) and Frequency Division Multiple Access (FDMA). It adds TDMA to get three channels per AMPS channel, thus tripling the number of calls on a channel. D-AMPS served as a crucial transition technology from analog to digital cellular communications, providing improved voice quality, better security, and increased capacity while maintaining backward compatibility with existing AMPS infrastructure. D-AMPS Channel Structure ...
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 MoreGeosynchronous and Geostationary Satellites
A geosynchronous satellite is a communication satellite that has an orbital period equal to the Earth's rotation period. This means it appears to be permanently in the same area of the sky at a particular time each day when viewed by an observer on Earth. The orbit in which a geosynchronous satellite is placed is called a geosynchronous orbit (GSO). Its orbital period is the sidereal day (23 hours 56 minutes 4 seconds) and its orbital altitude is 35, 800 km above Earth's surface. Geostationary Satellite and Geostationary Orbit (GEO) A geostationary satellite is a special type ...
Read MoreA Protocol Using Go-Back-N
Go-Back-N protocol, also called Go-Back-N Automatic Repeat reQuest, is a data link layer protocol that uses a sliding window method for reliable and sequential delivery of data frames. It is a case of sliding window protocol having to send window size of N and receiving window size of 1. Working Principle Go-Back-N ARQ provides for sending multiple frames before receiving the acknowledgment for the first frame. The frames are sequentially numbered and a finite number of frames. The maximum number of frames that can be sent depends upon the size of the sending window. If the acknowledgment of ...
Read MoreWhat is pipelining?
In computer networking, pipelining is the method of sending multiple data units without waiting for an acknowledgment for the first frame sent. Pipelining ensures better utilization of network resources and also increases the speed of delivery, particularly in situations where a large number of data units make up a message to be sent. How Pipelining Works In traditional stop-and-wait protocols, the sender transmits one frame and waits for its acknowledgment before sending the next frame. This approach leads to inefficient use of available bandwidth, especially in high-latency networks. Pipelining allows multiple frames to be transmitted continuously without waiting ...
Read MoreFind if your Email Provider is Leaking Your IP Address
Many users are unaware that sending emails can disclose more information than intended, particularly through email headers that may contain sensitive data like your IP address. This information can reveal your approximate location and other private details to recipients. When you compose and send an email, additional metadata called header information is automatically attached. Depending on your email provider and the method used to send emails, this header may include your IP address, which recipients can use to determine your general location and other personal information. Email Header Information Flow ...
Read MoreHtml5 responsiveness of the web
HTML5 responsive web design is a modern approach that enables websites to automatically adapt their layout, content, and functionality across different devices and screen sizes. Unlike traditional fixed-width designs, responsive websites provide an optimal viewing experience whether accessed on desktops, tablets, or mobile phones. The responsiveness of a webpage refers to its ability to dynamically adjust its layout, typography, images, and content based on the device's screen dimensions and capabilities. This ensures users receive a tailored experience regardless of how they access the website. Responsive Design Across Devices ...
Read MoreWhat is the difference between novalidate and formnovalidate attributes?
The novalidate and formnovalidate attributes are HTML5 attributes used to bypass form validation. The novalidate attribute is applied to the element to disable validation for the entire form, while formnovalidate is applied to individual submit buttons to override form validation on a per-button basis. Both attributes are Boolean attributes, meaning their presence enables the functionality regardless of their value. These attributes are particularly useful when you want to allow users to save form progress or submit incomplete forms in certain scenarios. Syntax Following is the syntax for the novalidate attribute − ...
Read MoreHow to create JLabel to hold multiline of text using HTML in Java?
In Java Swing, the JLabel component by default displays only single-line text. To create a JLabel that can hold multiple lines of text, we need to use HTML formatting within the label text. This allows us to use HTML tags like for line breaks and other HTML formatting elements. Syntax Following is the syntax to create a multiline JLabel using HTML − JLabel label = new JLabel("Line1Line2"); For more complex formatting with alignment − JLabel label = new JLabel("Line1Line2", JLabel.LEFT); How It Works When a JLabel's text starts ...
Read MoreChoose which option is selected on pageload of razor Html.DropDownListFor() in HTML?
The Html.DropDownListFor() helper in Razor allows you to create dropdown lists bound to model properties. To control which option is selected on page load, you can use the Selected property of SelectListItem or rely on the model's property value to automatically determine the selection. Syntax Following is the basic syntax for Html.DropDownListFor() with preselected options − @Html.DropDownListFor(m => m.PropertyName, new List { new SelectListItem { Value = "value1", Text = "Text1", Selected = condition }, ...
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