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Kilo=one thousand
Meg=one million
Gig=one billion
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KBPS means Kilobytes per second.
MBPS means Megabytes per second
GBPS means Gigabytes per second
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ASDL
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1.5 to 8.2 Mbps downstream.64-1 Mbps upstream.
Description:
Technology designed to carry data and voice transmissions over the existing public switched telephone network. Form of RADSL. Mainly used for commercial and residential hookups.
Pros: Provides high-speed access at a relatively low-cost.
Cons: Not yet widely available. Relatively long installation times. Not the best option for heavy Internet usage.
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SDSL
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1.544/2.048 Mbps upstream and downstream.
Description:
Essentially a rate adaptive form of HDSL. Popular with businesses due to its symmetrical data transmission capabilities.
Pros: Provides high- speed access at a relatively low-cost. Popular business alternative. Not yet widely available.
Cons: Popular business alternative. Not yet widely available. Relatively long installation times.
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Frame
Relay
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56 Kbps-1.544 Mbps
Description:
A high-speed packet switching protocol used in wide area networks (WANs). Used as company backbone to ISP and ISP to internet infrastructure.
Pros: Available at various speeds. Additional bandwidth is usually available at critical times.
Cons: Less reliable then dedicated leased line access. Set-up is typically more expensive than xDSL.
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Fractional
T-1
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128 Kbps to 1.544 Mbps
Description:
Basic T-1 with some of the 24 64 Kbps channels turned off. Company backbone to ISP.ISP to internet infrastructure.
Pros: Provides reliable, guaranteed bandwidth.
Cons: Setup costs and monthly fees can be fairly expensive.
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T-1
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1.544 Mbps
Description:
A point-to-point dedicated, digital circuit supporting data rates of 1.544 Mbps. Company backbone to ISP and ISP to internet infrastructure.
Pros: Provides reliable, guaranteed bandwidth.
Cons: Setup costs and monthly fees can be fairly expensive.
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E-1
(Europe)
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2.048 Mbps
Description:
32 Channel European equivalent of the T-1. Used as a company backbone to ISP and ISP to internet infrastructure.
Pros: Provides reliable, guaranteed bandwidth.
Cons: Setup costs and monthly fees can be fairly expensive.
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Fractional
T-3
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3 Mbps to 44.736 Mbps
Description:
Basic T-3 with some of the 672 64 Kbps channels turned off. Used as connection from ISP to internet infrastructure. Smaller links within internet infrastructure.
Pros: Provides reliable, guaranteed bandwidth.
Cons: Setup costs and monthly fees can be fairly expensive.
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T-3
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44.736 Mbps
Description:
A dedicated connection supporting data rates of about 45 Mbps. ISP to internet infrastructure. Smaller links within internet infrastructure.
Pros: Provides reliable, guaranteed bandwidth.
Cons: Setup costs and monthly fees can be fairly expensive.
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E-3
(Europe)
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34.368 Mbps
Description:
European equivalent of T-3. Carries 16 E-1 signals. ISP to internet infrastructure. Smaller links within internet infrastructure.
Pros: Provides reliable, guaranteed bandwidth.
Cons: Setup costs and monthly fees can be fairly expensive.
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OC-3
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155.52 Mbps
Description:
Optical fiber carrier with a capacity of 155.52 Mbps. Large company backbone. Internet backbone.
Pros: Extremely high speed.
Cons: Extremely high cost.
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OC-12
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622.08 Mbps
Description:
Optical fiber with a capacity of 622.08 Mbps. Internet backbone.
Pros: Extremely high speed.
Cons: Extremely high cost.
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OC-48
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2.488 Gbps
Description:
Optical fiber with a capacity of 2.488 Gbps. Internet backbone.
Pros: Extremely high speed.
Cons: Extremely high cost.
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OC-192
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10 Gbps
Description:
Optical fiber with a capacity of 10 Gbps. Internet backbone.
Pros: Extremely high speed.
Cons: Extremely high cost.
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• Free