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  Multiplexing is the technique of combining multiple signals into a single signal for transmission over a communication channel. In data transmission, multiplexing allows multiple users to share a single communication channel, maximizing its use and increasing efficiency. There are several types of multiplexing used in data transmission, including: Frequency Division Multiplexing (FDM): This technique divides the available frequency range into multiple non-overlapping sub-channels, each of which can be used by a separate signal. Each signal is modulated onto a separate carrier frequency and combined into a single composite signal for transmission. FDM is commonly used in analog systems, such as radio and television broadcasting. Time Division Multiplexing (TDM): This technique divides the available time into multiple time slots, with each slot dedicated to a separate signal. Each signal is transmitted in its designated time slot, and the signals are interleaved in time to create a...

  Cellular technology has undergone several generations of development, each offering new capabilities and improvements over the previous generation. The following is a brief overview of the different generations of cellular technology: 1G (First Generation): The first generation of cellular technology was introduced in the 1980s and used analog signals for voice communication. The technology was limited to voice calls and had a low data transfer rate. 1G networks were also expensive to build and maintain, and coverage was limited. 2G (Second Generation): 2G technology introduced digital signals, which allowed for more efficient use of the network and improved voice quality. 2G networks also enabled the use of basic data services, such as SMS (Short Message Service) text messaging. The introduction of 2G networks paved the way for the development of mobile devices that could be used for more than just voice calls. 3G (Third Generation): 3G technology offered faster data speeds, mak...

  Wi-Fi technology has gone through several generations or standards over the years, each offering faster data transfer speeds and better performance. Here are some of the key generations of Wi-Fi technology: 802.11b: This was the first widely used Wi-Fi standard and offered speeds of up to 11 Mbps in the 2.4 GHz band. 802.11a: This standard was introduced around the same time as 802.11b, but it used a different frequency band (5 GHz) and offered faster speeds (up to 54 Mbps). 802.11g: This standard was introduced in 2003 and offered faster speeds (up to 54 Mbps) in the 2.4 GHz band. 802.11n: This standard, introduced in 2009, offered faster speeds (up to 600 Mbps) and better range than previous standards by using multiple antennas and wider channels in the 2.4 GHz and 5 GHz bands. 802.11ac: This standard, introduced in 2013, operates only in the 5 GHz band and offers even faster speeds (up to 1 Gbps or more) and better range than 802.11n. 802.11ax (also known as Wi-Fi 6): This is ...