Clearly, we are very near the time when voices, images and facts can be transmitted precisely to any place in this world. Lets consider the outlook for the future. New kinds of wireless data services are rapidly being put in place, promising to offer us lots of choices. The following are a few such developments.
Digital Cellular Phones
Todays World News Headlines
Cellular telephone clubs are trying to rectify the question of faculty data transmission by switching from analog to digital, Digital Cellular Phone networks turn your voice into digital bits, which are sent straight through the airwaves, then decoded back into your voice by the cellular handset.
Unlike analog cellular phones, digital phones can handle short e-mail messages, paging, and some headlines news items in expanding to voice transmission. Currently any way these extra features wont work if the user is traveling face the digital network assistance area. More over to make and receive analog phone calls, your handset has to be able to work in both digital and analog mode.
A digital cell phone costs more than an analog one, but the monthly bill may be less, especially for heavy users. Digital phone networks promise clearer sound, although some customers don't agree. They also offer more privacy and Value Added Services like Gprs, Mms etc.
Despite Advances in wireless technologies, American cell phones are useless face North America. If you are an American travelling abroad, you will need to rent a temporary unit. All this promises to change in the next six years or so, however. Under the umbrella of the world trade organizations, 69 nations have agreed to distinct standards in worldwide telecommunication systems.
Personal transportation Services
Special transported phones known as Pcs phones have seen a surge in popularity. The lure is assistance that's noticeably better-surrounding and less costly than the approved analog cellular phones.
Like digital cellular, but low-powered, personal transportation services (Pcs), or personal transportation networks (Pcn), are digital wireless services that use a new band of frequencies (1850-1990 Mhz) and transmitter-receivers in thousands of microcells. Pcs systems operate at super high frequencies, where the spectrum isn't crowded. The microcells are smaller than the cells of todays cellular phone systems.
Satellite-Based Systems
The first communications satellite, At&T's Telstar, went up in 1962. Now all of a sudden it looks like we will have a traffic jam in space. More than half the population nearby the world, mostly in underdeveloped countries, live more than 2 hours from the nearest telephone. ( China has only four telephone lines for every 100 people.) These people, as well as company travelers and corporations needing rapid data transmission, are demanding more than wire-line or cellular assistance can deliver. At a World Trade club meeting in 1997, for instance 67 nations agreed to open their transportation markets to foreign satellite systems.
In the next few years, four kinds of satellite systems will dot the skies to contribute a range of buyer services. The first is the Tv direct-broadcast system, and the second is the Gps system. The third type is designed to handle cellular-phones and paging services using satellite transmissions in place of tower-to-tower microwave transmissions.
Probably most animated is the fourth, which consists of global high speed satellite networks that will let users replacement a much broader range of data, together with internet pages and video phone calls, in any place in the world. Five giant clubs have been competing: Globalstar, Iridium, Orbcomm, Teledesicn and Motorola.
All these clubs are taking huge risks because the consensus of experts is that not all these ventures can survive.
Gigabit Ethernet: Sending data at Supercomputer Speeds
Most corporate networks use Ethernet, a bus network devised in the 1970's. It moves data at the rate of 10 million bits per second. In 1995 fast Ethernet was invented, which can transmit data at 100 million bits (100 megabits) per second.
Now a hot new technology promises to make office networks 100 times faster then standard. " It will help end data roadblocks at major financial companies, Internet assistance providers, heavy duty engineering firms, and other big enterprises" says in one report that, Gigabit Ethernet can move data at 1000 million bits ( 1 gigabit ) per second. Recently commercial firms have jumped in to make the technology more widely available.
Bluetooth: The Next Big Wireless Wave?
Bluetooth is a wireless technologu that uses easy shortwave radio links to allow as many as eight electronic devices to chronicle within about 33 feet of one another. This will allow individuals to form their own personal networks, using cell phones, laptops, Pda's to replacement emails, schedules and address information, compete at video games or access the internet. One of the first gadgets is a wireless headset that links wirelessly to a cell phone, so that users can talk hands-free while driving. Already more than 1600 clubs are developing devices and applications for Bluetooth.
Photonics: visual Technologies at Warp Speed
"Moore's law said that chip power would duplicate every 18 months," writes journalist Howard Banks. "That's plodding. The new law of the photon says that bandwidth triples every year.
Photonics is the science of sending bits by means of light pulses carried on hair-thin glass fibers. For 15 years, The glass fibers of fiber-optics lines have been used to carry light pulses representing voice and data in long distance telephone lines. Photonics has achieved breakthroughs that enable glass fibers to carry more light signals than ever before.
Older fiber optics technologies were small to only few dozen miles. Then the light beam had to be converted to electrical signals, amplified and converted back into light signals. The made the technique slow, unreliable and expensive.
Then in December 1988, researcher David Payne at the University of Southampton in England advanced an visual amplifier. This gadget boosts light signals without converting then first to electrical signals. The amplifier in one description, "gives a huge push to the incoming signal, letting is carry on for dozen of more miles to the next amplifier." Engineers also devised other technology ( called wave-division multiplexing) that allows laser pulses of dissimilar hues to be sent down the same tiny fibers, which may grow to 100 channels per fiber in a few years. The upshot is that in the laboratory researches have been able to yield glass fiber systems that carry 2 trillion bits (2 terabits) per second. That is six time the volume of all phone calls in the United states on an median day.
The hereafter Of CommunicationsTags : todays world news headlines
0 comments:
Post a Comment