| |
|
| |
 |
|
 |
 Yahoo
Broadband Internet Plans UK - United Kingdom
|
Yahoo! Inc. (NASDAQ: YHOO) is an American global
Internet services company. It operates an Internet
portal and provides a full range of products and
services including a search engine, the Yahoo!
Directory and Yahoo! Mail. It was founded by
Stanford graduate students Jerry Yang and David
Filo in January of 1994 and incorporated on March
2, 1995. The company is headquartered in
Sunnyvale, California.
According to Web trends companies among others
Alexa Internet and Netcraft, Yahoo! has been the
most visited website on the Internet with more
than 412 million unique users. The global network
of Yahoo! websites received 3.4 billion page views
per day on average as of October 2005, making it
one of the most visited U.S. websites.
Broadband in telecommunications is a term which
refers to a signaling method which includes or
handles a relatively wide range of frequencies
which may be divided into channels or frequency
bins. Broadband is always a relative term,
understood according to its context. The wider the
bandwidth, the more information can be carried. In
radio, for example, a very narrowband signal will
carry Morse code; a broader band will carry
speech; a yet broader band is required to carry
music without losing the high audio frequencies
required for realistic sound reproduction. A
television antenna described as "normal" may be
capable of receiving a certain range of channels;
one described as "broadband" will receive more
channels. In data communications a modem will
transmit a bandwidth of 64 kilobits per seconds (kbit/s)
over a telephone line; over the same telephone
line a bandwidth of several megabits per second
can be handled by ADSL, which is described as
broadband (relative to a modem over a telephone
line, although much less than can be achieved over
a fibre optic circuit, for example). With Cable
Broadband there is a higher chance of maintaining
a constant broadband speed compared to ADSL
services.
Broadband in data communications may have the same
meaning as above, so that data transmission over a
fiber optic cable would be referred to as
broadband as compared to a telephone modem
operating at 600 bits per second.
However, broadband in data communications is
frequently used in a more technical sense to refer
to data transmission where multiple pieces of data
are sent simultaneously to increase the effective
rate of transmission, regardless of actual data
rate. In network engineering this term is used for
methods where two or more signals share a medium.
Various forms of Digital Subscriber Line service
are broadband in the sense that digital
information is sent over one channel and voice
over another channel sharing a single pair of
wires. Analog modems operating at speeds greater
than 600 bit/s are technically broadband. They
obtain higher effective transmission rates by
using multiple channels with the rate on each
channel limited to 600 baud. For example, a 2400
bit/s modem uses four 600 baud channels (see
baud). This is in contrast to a baseband
transmission where one type of signal uses a
medium's full bandwidth such as 100BASE-T
Ethernet.
|
|
|
|
|
