Nobody downloaded yet

Digital Telecommunications and Networks - Essay Example

Comments (0) Cite this document
Digital signals are relatively immune to noise, as opposed to analog signals. This is because with digital signals, it is not necessary to evaluate the exact amplitude, frequency, or phase to determine if its condition is either logic 1 or logic 0. It only involves evaluating transmitted pulses at precise time intervals, and determining whether the said pulse is above or equal to a set reference level (logic 1), or below it (logic 0).
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER92% of users find it useful
Digital Telecommunications and Networks
Read TextPreview

Extract of sample "Digital Telecommunications and Networks"

Download file to see previous pages In the signal amplification of analog systems, noise is amplified with the analog signal. Thus, the signal-to-noise ratio deteriorates for each time an analog signal is amplified. Digital regenerators, on the other hand, reproduce an entirely new digital signal from a sample noisy digital signal. The signal-to-noise ratio of this new digital signal has the same signal-to-noise ratio as the original signal. Thus, digital signals can be transmitted over longer distances than analog signals.
Pulse Code Modulation is simply digitally coding analog signals. It consists of sampling analog information signals and then converting them to a serial n-bit binary code for transmission over a physical medium. With PCM, each code has the same number of bits and requires the same length of time for transmission. The presence or absence of a pulse within a specific time slot indicates either a logic condition of 1 or 0 respectively.
Wayne Tomasi, in his book Electronic Communications Systems, outlined how a simplex PCM system is integrated in telephony: An analog input signal passes a band pass filter which limits it to the standard voice-band frequency range of 300Hz to 3000Hz. The sample and hold circuit periodically converts samples of the analog input signal to a multilevel Pulse Amplitude Modulation (PAM) signal. The analog-to-digital converter (ADC) converts these PAM signals to parallel PCM codes. These parallel PCM codes are then converted to serial binary data in the parallel-to-signal converter. Finally, the serial binary data are then outputted onto the transmission medium as serial pulses. At the receiver's end of the transmission medium, the serial pulses pass through the serial-to-parallel converter. The digital-to-analog converter then converts parallel PCM codes to parallel PAM signals. Finally, the hold circuit which is a low pass filter, converts parallel PAM signals to the original analog signal (408).

Time Division Multiplexing is the transmission of information from multiple sources to one or more destinations using the same facility but at different transmission times. The following are the fundamentals of how Time Division Multiplexing is integrated in telephony as summarized by Wayne Tomasi: In a 2-channel PCM-TDM system, each channel's input is sampled and then converted to an eight-bit PCM code. While the PCM code of channel 1 is transmitted over the transmission medium, channel 2 analog input signals is sampled and converted to a PCM code. And when the PCM code of channel 2 is transmitted, it is channel 1 that then undergoes analog input sampling and conversion (453).

C.) Describe the main operating principles of CDMA (Code Division Multiple Access) technology and GSM (Global System Mobile) technology in mobile communication.
Code-Division Multiple Accessing is a cellular telephone system based on spread-spectrum technology. It uses a unique code rather than a frequency or time assignment to differentiate users from one another. With CDMA, the base station uses ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
(“Digital Telecommunications and Networks Essay Example | Topics and Well Written Essays - 2500 words”, n.d.)
Digital Telecommunications and Networks Essay Example | Topics and Well Written Essays - 2500 words. Retrieved from
(Digital Telecommunications and Networks Essay Example | Topics and Well Written Essays - 2500 Words)
Digital Telecommunications and Networks Essay Example | Topics and Well Written Essays - 2500 Words.
“Digital Telecommunications and Networks Essay Example | Topics and Well Written Essays - 2500 Words”, n.d.
  • Cited: 0 times
Comments (0)
Click to create a comment or rate a document

CHECK THESE SAMPLES OF Digital Telecommunications and Networks

Telecommunications and Networks Applications

...? Telecommunications and Networks Applications This study seeks to understand telecommunication and networks application, through the study of video conferencing and geostationary satellites. The uses, benefits as well as the disadvantages of these communication tools will be discussed under this study. Discussion Videoconferencing refers to a mode of communication, where two individuals or groups of people can communicate through audio and visual two-way transmission, which is simultaneous. Through video conferencing, multiple locations can communicate on the same agenda, while listening and seeing each other (Wolfe, 2007). Videoconferencing is made possible using telecommunication technologies, which ensures there is real time... ...
3 Pages(750 words)Research Paper


...and information business. It is in this perception that most convergence policies are seen. The European Commission "Green Paper" on convergence published in December 1997 states: 'There is widespread agreement that convergence is occurring at the technological level. That is to say that digital technology now allows both traditional and new communication services - whether voice, data, sound or pictures - to be provided over many different networks. Current activity in the market suggests that operators from the sectors affected by convergence are acting on the opportunities provided by technological advances to enhance their traditional services and to branch out into new activities....
26 Pages(6500 words)Essay

Telecommunications Industry

...was invented in 1876. Wireless communication was established in 1901. Transmission of moving pictures was demonstrated in 1925. Research on computer networks and the Internet started in 1940s. Popular link protocols for local area networks (LANs) appeared in the 1970s. AT&T was the first biggest telecommunications company. In 1913, AT&T committed to dispose its telegraph stock. The Telecommunication Act of 1996 changed the regulation and opened the market for competition. AT&T continued to act as the leader, establishing standards for others to follow. In 2000s, the telecommunication industry saw a lot of mergers and reorganizations. Bell Atlantic and...
5 Pages(1250 words)Essay

British Telecommunications

...Internet service (D'Arcy 2006). It is a tough market, but BT seems to have positioned itself well. In 2003, more than a year after BT began its financial restructuring, industry publication America's Network ranked BT the fourth-best-positioned telecommunications provider in the world to meet future challenges (Engebretson 2003). America's Network cited BT's ability to make difficult decisions, its willingness to scrap unprofitable ventures and the fact that "its balance sheet now looks credible," because it had reduced its debt (Engebretson 2003). BT's financial credibility extended throughout fiscal-year 2006 and into the first fiscal quarter of 2007. Revenue for FY 2006 grew to...
12 Pages(3000 words)Assignment

Detection masses in digital mammography images using neural networks

...Research Proposal Topic of Thesis: ‘Detecting masses in digital mammography images using neural networks’ Objective The basic objective of the thesisis to detect masses in digital mammography images using neural networks. I will develop a hybrid system that will also include the advantages of previous CAD systems. The new system will be able to mark breast abnormalities on digital and film mammograms more effectively than the previous CAD systems. Background A group of cancer cells starts growing into the surrounding breast tissues causing a malignant tumor, which is known as breast cancer. About one out of every eight females faces this disease....
2 Pages(500 words)Thesis

Telecommunications Paper

...17 October Introduction The broadcasting distribution of continuous media data, e.g. movies and music, have acquired more attention in addition to the recent popularity of digital broadcasting including terrestrial digital TV broadcasting and digital radio broadcasting. Generally, servers tend to broadcast the same data repeatedly while broadcasting. This method is effective in broadcasting to a great number of clients in that data can be distributed to multiple clients. However, clients must wait until the desired data is ready for broadcasting. This broadcasting method is called “near-on-demand system”. In certain CS and BS digital broadcasts, one popular movie title...
16 Pages(4000 words)Essay


...Network. This is the network type that is of primary importance all over the world as it is the one that enables communication between almost all networked computer entities in the world. In IP addressing it is seen that what is commonly used is decimal numbers as compared to binary notation. The primary reason for this is because the decimal numbers are easier to remember in comparison to their binary equivalent. In the case of comparing the bit signal used, the company should opt to stick to the 24-bit digital audio technology as compared to developing one that makes use of the 28-bit. This is because the technology that is there supports the 24-bit and in the event...
1 Pages(250 words)Essay


... skills as well as to excel in the company is a lot. One weakness of working in this company for me is that since I am the only telecommunication engineer, I have to handle everything. This increases the load for me and sometimes, the work is too much to do singlehandedly. Although I usually get to manage the work within the time, but some times I have to overstay in order to do my work. Another weakness of this company originates basically in the nature of my job. My job is of such nature that problem can arise any time 24/7 and I have to address that wherever I am. So many times, I am called from home after the break off time to fix a certain error in the telecommunication network because of the importance of telecommunication... ...
2 Pages(500 words)Term Paper

Managment and Digital Labour Networks

...MANAGEMENT AND DIGITAL LABOUR NETWORKS Introduction Modern growth and developments in the digital media industry has seen many people dream of finding a job in the industry. This is because of the thought that the industry has many career opportunities as well as capacity to meet and interact with people from different parts of the world. However, working in this industry is usually not as much as fun as many people assume it is, this is because, workers have always explained that the job is naturally exploitative and punishing. The job is said to be ruthless and casual in nature, there is long hours of work and sometimes errors can cause one to be banned from the digital...
11 Pages(2750 words)Essay

Digital Telecommunications and Networks a network and allows computers to send messages to other computers on the network. One of the best known forms of addressing is the Internet Protocol (IP) address. 7 C.Next-hop address: Whenever a data packet passes through a router a hop occurs. For example, if someone is sending data from Asia to America then the delay is must as the data passes through multiple routers and routers also take time to process the packet to the destination. Basically Next-hop address is the address of the next router through which the data packet passes. 7 D.Interface: Interface of a router is basically the medium that we use to connect a router. Few examples are BRI (Basic Rate interface), Serial, and Fast Ethernet...
8 Pages(2000 words)Assignment
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.

Let us find you another Essay on topic Digital Telecommunications and Networks for FREE!

Contact Us