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Showing posts with label Communication Technology. Show all posts
Showing posts with label Communication Technology. Show all posts


I want to tell you about
1- submarine communication,
2- amplifiers
3- repeaters
4- fiber optics
5-telecommunication network and fiber optic cables.


The cable protection committee was established in 1958 in London to protect the submarine cables.
This committee is funded by the member fiber optic cable operators and the main responsibilities of this committee to protect the submarine communication cable. Earlier telecom submarine cables were not using repeaters so there were great bandwidth problems. In 1980 fiber optical was developed it uses the optical amplifiers to transmit the signals at a very high speed. Submarine power cables are running for supplying the electrical power. Fishing, anchoring and shark fish bites can cause the damage to the cables and the damaged portion of the cable is brough Submarine communication cables are the fiber optical cables and are used for the cross Atlantic communications. Submarine cables are consisting of fiber optics and electrical conductive tube that is used to transfer the electrical signals between the repeaters. Repeaters are the network communication and telecom devices that are used to amplify the signals. Repeaters operate at the physical layer of the OSI layers model and work with the physical signals. Submarine fiber optical cables are less susceptible to failure and are very high transmission cables.

Submarine fiber optical cables are usually laid under the sea. A great research and planning is required to install the submarine fiber optic cables. Fiber optic cable is a light weight cable, 13 cm in diameter and consists of a bunch of glass fibers that are cable of transmitting the light. So the data is transferred at the speed of light through the fiber optic cables. Normally the submarine cables are not installed on the area where the fishing and ship activities are very common.

Because ship anchor and shipping vessels can be the problem for the submarine cables. Submarine telecommunication cable is a cable that is used for the telecommunication between the countries across the world. With the passage of time, the submarine cables have advancements and new technologies and communication devices are being used in the telecommunication. Submarine telecommunication cables with the high amplifier can transmit data and signals at more than 5 GB per seconds. Submarine cables were first used for the telegraphic transmission between the countries, then for telephone and then for data communication.

Today, fiber optic submarine cable is the backbone of the whole internet. In case of any damage to the submarine cables the whole communication system may be affected allot. The international t to the surface for repairing purposes. The installation and the repairing cost of the submarine cables is much high. These cables are laid in the seabed by the cable lying ships. These ships are owned and operated by the wireless and big telecommunication companies around the world. The optical fibers in the fiber optic are used as a sensor to measure heat, pressure and temperature.

Fibers are made up of transparent plastic and glass to pass the light at a very high speed. Earthquakes are also the cause of the damage for the communication cables and a major Tsunami earthquake in December 2004, caused big damages to the underlying telecom cables. Telecom cables have a large network across the world. Some of the major submarine cable companies of the world are Apollo, Pan American Crossing, Pacific Rim East, Japan-US, Columbus II, Columbus III, RJK, Eastern Caribbean fiber system and many other companies.

Posted by Kami Sunday, May 25, 2008 0 comments


The Cell Phone Network.
A cellular network is a radio network made up of a number of radio cells (or just cells) each served by a fixed transmitter, known as a cell site or base station. These cells are used to cover different areas in order to provide radio coverage over a wider area than the area of one cell. Cellular networks are inherently asymmetric with a set of fixed main transceivers each serving a cell and a set of distributed (generally, but not always, mobile) transceivers which provide services to the network's users.

Cellular networks offer a number of advantages over alternative solutions:

increased capacity
reduced power usage
better coverage
A good (and simple) example of a cellular system is an old taxi driver's radio system where the taxi company will have several transmitters based around a city each operated by an individual operator.

Posted by Kami Sunday, April 27, 2008 0 comments

Information Communication Technology (ICT) has been largely limited either for peer to peer communication, or expert to audience communication. In peer to peer communication I would include exchanging information electronically, say e-mail. In the second category I would include information through books, newspapers, magazines and websites whether maintained by commercial establishments, government agencies or educational institutions. The information transfer by this mode was largely one-way, from the expert to the targeted audience. The targeted audience has had no choice but to accept the information as it is presented. Because the person(s) responsible for creating information was not totally aware of the capabilities, likes, limitations of the targeted audience. For example, even when a fraction of the targeted population was not really be comfortable with language in which the information is presented she had no alternative. Same was the case even when the targeted person did know a particular language s/he may be hampered by the dialect. The information was usually presented as text only even though the target may not be always comfortable in reading text. In short, the technologies often used to fall short of the real requirements of information recipient. Thus there was a huge potential for the developing ICTs that will suit the pockets, tastes and real requirements of a burgeoning population of information seekers.
Till a decade ago, the Internet that was a vehicle to disseminate information from a selected few to the rather affluent sections of the society was mistakenly viewed as the technology for the future of communication. But in the last few years the indicators point to changes that may yet again revolutionize information communication.

Posted by Kami Monday, April 14, 2008 0 comments

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