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Speed Chart - Jargon

 

 
How speed is measured in the two major aspects of computer jargon: 
 
Data - How data is measured:
  Data is measured on your hard drive (i.e.- file sharing and FTP programs measure transfer speeds).

Kilo is 1,024 and Mega is 1,048,576.

Examples: 1,048,576 B = 1,024 KB and 1,048,576 KB = 1,024 MB  Bytes / Bits - Lower case b means bit and upper case B means Byte. There are 8 bits to a Byte.  more>>

To see more about this see our Byte Chart page for more details.

 
Communication - How communication devices are rated:
  Kilo means 1,000 and Mega means 1,000,000.

Examples: 56k modem and 10Mbit Ethernet

KB stands for Bytes and Kb stands for bits (eight bits to a Byte).

 
Internet Access Speed - Differences in measuring
 

KB / Kb

 
    The abbreviation for bit is a lowercase "b"; the abbreviation for byte is an uppercase "B". Their are 8 bits in a Byte. 
 

Modem

 
    Dial up modem speed is measured in Kilo and Mega bits.  Dial up modem speeds are pretty much tapped out at their high end of 56Kb due to the noise that exists on standard POTS copper telephone lines.  A few companies have toyed with filtering systems to help quiet the lines but with the newer packet lines taking over the market place we may someday see these POTS lines disappear altogether.
 

DSL

 
    Digital Subscriber Line (DSL) is a broadband internet service that is delivered right through your regular phone line and is often supplied by your local telephone company. Although it uses your phone lines, it does not interfere in anyway with you telephone, caller id, answering machine or other telephone equipment. It is typically available in speeds from 144Kb to 3Mb, but even faster speeds are available from some providers.
 

aDSL

 
    A type of DSL common for residential use is Asymmetric Digital Subscriber Line (ADSL). It is asymmetrical in the sense that it can download (receive) data much faster than it can upload (send) data. Typical internet surfing mainly involves downloading data from web servers, so this asymmetry works out fine for home use. Plus this asymmetry often allows for large cost savings.
 

sDSL

 
    A type of DSL that is common for business use is Symmetric Digital Subscriber Line (SDSL). With SDSL you get the same bandwidth (speed) in each direction. Although it is typically much more expensive than ADSL, it is better if you are running a web server or conducting other activities which would require a lot of data to be sent.
 

Cable

 
    Cable internet access is generally offered by the same companies that provide cable TV. It works on the same coaxial cable that the TV signal comes in on, but doesn't effect your TV signal. Therefore you can use the internet and watch TV at the same time. Typically, cable internet access provide a maximum of 1.5 - 6MB of bandwidth on the system. However, everyone on your network segment is sharing that bandwidth, so performance can be much lower, especially if a lot of people in your neighborhood use the service. Some cable providers may limit your individual bandwidth, so that you will never see the peak bandwidth even when your network segment is clear.
 

Satellite

 
    With satellite internet access, data is sent between a small satellite dish at your home and the satellite in space. This data is then relayed to a base station that has a direct connection to the internet and acts as a hub.  Especially for those in rural areas that cannot get DSL or Cable internet access, a satellite ISP can be a good way to get broadband service.  Some satellite systems use a phone line and others use a in-sight tower system to send upstream requests.
 
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