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Telecommunications

Telecommunications refer to the transmission of information over distances for the purpose of communication. In the modern age of electronics and electricity, telecommunication includes the use of electrical devices, radio and microwave communications, fiber optics, orbiting satellites and the Internet.

2,044 Questions

Does Mexico use telephones in 1930?

Yes. Telephone companies had made their way into the region by 1905 as a matter of fact. So indeed there were telephones in use during the year 1930.

Who is the President of ATT?

Randall L. Stephenson


Randall Stephenson is President and CEO.

What are the advantages and disadvantages of coaxial cable?

Coaxial cable is still the most common means of data transmission over short distances.

The advantages are:

- they are cheap to make

- cheap to install

- easy to modify

- good bandwith

- great channel capacity

- noise immunity due to low error rate

The advantages of using coax include the following:Broadband system

Coax has a sufficient frequency range to support multiple channels, which allows for much greater throughput.

Greater channel capacity

Each of the multiple channels offers substantial capacity. The capacity depends on where you are in the world. In the North American system, each channel in the cable TV system is 6MHz wide, according to the National Television Systems Committee (NTSC) standard. In Europe, with the Phase Alternate Line (PAL) standard, the channels are 8MHz wide. Within one of these channels, you can provision high-speed Internet access-that's how cable modems operate. But that one channel is now being shared by everyone using that coax from that neighborhood node, which can range from 200 to 2,000 homes.

Greater bandwidth

Compared to twisted-pair, coax provides greater bandwidth systemwide, and it also offers greater bandwidth for each channel. Because it has greater bandwidth per channel, it supports a mixed range of services. Voice, data, and even video and multimedia can benefit from the enhanced capacity.

Lower error rates

Because the inner conductor is in a Faraday shield, noise immunity is improved, and coax has lower error rates and therefore slightly better performance than twisted-pair. The error rate is generally 10-9 (i.e., 1 in 1 billion) bps.

Greater spacing between amplifiers

Coax's cable shielding reduces noise and crosstalk, which means amplifiers can be spaced farther apart than with twisted-pair.

The main disadvantages of using coax are as follows:Problems with the deployment architecture

The bus topology in which coax is deployed is susceptible to congestion, noise, and security risks.

Bidirectional upgrade required

In countries that have a history of cable TV, the cable systems were designed for broadcasting, not for interactive communications. Before they can offer to the subscriber any form of two-way services, those networks have to be upgraded to bidirectional systems.

Great noise

The return path has some noise problems, and the end equipment requires added intelligence to take care of error control.

High installation costs

Installation costs in the local environment are high.

Susceptible to damage from lightning strikes

Coax may be damaged by lightning strikes. People who live in an area with a lot of lightning strikes must be wary because if that lightning is conducted by a coax, it could very well fry the equipment at the end of it.

How can you make a telecommunication management network's based element management software EMS?

Dhyan offers Dhyan Network Management Systems (DNMS) and Dhyan Network Management Test Suite (DNTS). Both these technologies are aimed at helping customers get their management systems such as the Network/Element Management System to the market place quickly and in a cost effective manner.

DNMS consists of pre-built EMS/NMS components addressing the generic topology and FCAPS functionality. These components are reusable, open systems based (where possible) and use the state of art technologies to ensure that the systems developed using these components are scalable and customizable.

DNTS technology is designed to help automate regression testing. DNTS is based on third party tools such as Mercury and WATIR to regression test Windows and Web GUI application. http://dhyanit.com/solutions/telecom/element-management-system-technology.htm [url]http://dhyanit.com/solutions/telecom/element-management-system-technology.htm[url]

Can I replace my adsl modem with a modem router?

Yes you can because the modem router has a modem built in. There are different types of modem routers that suit different needs. If you are only going to be surfing the web you will need a "N" modem router, if you are going to be sharing files then you will need a "N+" modem router and if you are going to be gaming e.g. connecting to a Xbox 360 or PlayStaion 3 you will need a "N+N" modem router, I would personally recommend Belkin modem routers. Hope you find this useful!

What does telecommunications include?

The definition of telecommunications is the means of communicating over an undefined distance. With that in mind telecommunications can involve various methods. Yelling, screaming, letter writing, broadcast television, radio, courier pigeon, talking over a phone, instant messaging, texting, emailing, etc. are all forms of telecommunications.

What is the concept of fast access DSL about?

Fast access DSL is a concept made by AT&T that ensures better Internet access for its services. The company is capable of doing this as it is one of the bigger Internet service providers.

You have internet with cable dsl modem can you hook the laptop to the modem using usb lap top only has printer portserialcom port mouse keyboard connection and monitor hookups?

No. If your laptop does not have the port required to use the modem and at the very least has a PCMCIA card slot, you must buy the necessary PCMCIA card, such as an ethernet adapter, assuming your cable or dsl modem uses such a connector.

There is now this USB LAN (try goggling the image) adapter where you can connect the modem's cable to your laptop, It's cheap, handy and it works just fine.

What is the advantage of sliding window protocol over stop and wait protocol?

On data links with long transmission delays (e.g. communication satellites) sliding windows protocol allows multiple packets to be in transit pending ACK packets back from the receiver (up to the limit of the window size), which allows for nearly continuous transmission of packets through the data link.

On data links with long transmission delays (e.g. communication satellites) stop and wait protocol forces the transmitter to wait until it receives an ACK packet on every packet sent. If the transmission delays are long enough, the data link may be quiet and completely idle for the great majority of the time which is a serious waste of the resource.

Who is the actress in the ATT Rollover Minutes Trip to Vegas commercial?

Geneva Carr

http://www.genevacarr.com Close--- but I meant THIS commercial:

http://www.youtube.com/watch?v=xXrPU_TLc9s&feature=related

Anyone? Thanks! :)

How to write an email application leave to my boss?

To request a formal leave of absence, use the following format:

Dear _______ (insert name of supervisor):

I would like to formally request a leave of absence due to personal reasons. I will be gone from ____ (insert start date) to _____ (insert end date).

Please let me know if I can provide any further information on this matter. I greatly appreciate the opportunity to take a leave of absence and return to the company.

Sincerely,

Your Name

Before e-mailing a request, it is highly recommended that you meet with your supervisor in person to talk about the leave of absence. You don't want to blindside your boss with a sudden e-mail. Give as much notice as you can and be prepared to talk about the circumstances behind your request. You may need to print a hard copy of the request for documentation purposes, in which case you would include your contact information and sign the document.

Did Germans understand Morse code in world war 2?

Absolutely! My dad was a ham operator for many years and a military radio operator during WWII. Some years ago he sent me a copy of an article (going by memory here) written by a WWII German military radio operator. The German radio "op" detailed his role in passing a Morse code message to Allied forces requesting that they not bomb a certain ship in a particular harbor since it held Allied prisoners of war. The writer reported that when the Germans later surrendered, the Allied commander thanked the German commander for informing them and saving the lives of the Allied troops.

Morse code was heavily used for military radio communication on both sides during WWII. German made WWII military surplus telegraph keys (used for sending Morse code) are considered to be very good quality and are still in use by ham radio operators in many countries.

Where might one find more information on a digital subscriber line?

There are plenty of websites which provide information about a digital subscriber line. One can try such sites as How Stuff Works, DSL Reports and Got 2 Web.

Anyone had unsolicited phone calls from CCA International saying they are phoning on behalf of BT?

Yes, I have, I had a woman call me on a Saturday and offer me a better BT package, she explicitly said she was working on behalf of/the behest of BT, she was polite & apologetic when I explained I'd already complained to BT numerous times over it's marketing calls and willingly offered me the name of her company and their UK location. I'm currently pursuing a complaint with BT about this.

Why is Morse code used on ships?

The US Navy still uses morse code via signal lamps during periods of radio silence. It is all but impossible for an enemy to intercept it.

Pros and cons faced by telecommunication industry?

the only affect of the telecommunications industry is the amount of chese

How does the speed of NetZero DSL broadband compare to Roadrunner DSL broadband?

NetZero is not even close to Road Runner, or any cable modem, but the price is way, way, cheaper. If you don't need top of the line speed, & NetZero DSL is available, get it. It is very hard to find.

Who does voice for Narnia lion in att tv commercial?

hey there Liam Neeson has given the voice to Aslan in Chronicles of Narnia- the lion, the witch and the wizard. He is doing the same for Prince Caspian that is scheduled to release on the 16th of may 2008.

What is telecommunication network alternatives?

Telecommunication n/w alternatives includes the n/w model, n/w types, media, wireless technologies, telecommunication processors, telecommunication software, n/w topologies, n/w architecture and protocols, Bandwidth alternatives, switching alternatives.

How do you get faster access?

if you have the proper high speed computer devise , as well as service provider , internally and or if you are using external Internet connection