hi dear ones,
This chart is provided by Summersault ( My many many thanks) to help you understand the different kinds of internet connection technologies available.
|Carrier Technology||Description||Speed||Physical Medium||Comments|
|Dial-up Access||On demand access using a modem and regular telephone line (POT).||2400 bps to 56 Kbps||Twisted pair (regular phone lines)|| Cheap but slow compared with other technologies.
Speed may degrade due to the amount of line noise
|ISDN||Dedicated telephone line and router required.||64 Kbps to 128 Kbps||Twisted pair|| Not available everywhere but becoming more widespread.
An ISDN line costs slightly more than a regular telephone line, but you get 2 phone lines from it.
56K ISDN is much faster than a 56K dialup line
|Cable||Special cable modem and cable line required.||512 Kbps to 20 Mbps||Coaxial cable; in some cases telephone lines used for upstream requests.|| Must have existing cable access in area.
Cost of bring service into an area and trenching cable can be prohibitive.
Asymmetric Digital Subscriber Line
(ADSL is the same as DSL)
|This new technology uses the unused digital portion of a regular copper telephone line to transmit and receive information. ADSL is asymmetric since it recieves at 6 to 8 Mbps per second but can only send data at 64 Kbps.
A special modem and adapter card are required.
|128 Kbps to 8 Mbps||Twisted pair (used as a digital, broadband medium)|| Doesn’t interfere with normal telephone use.
Bandwidth is dedicated, not shared as with cable.
Bandwidth is affected by the distance from the network hubs. Must be within 5 km (3.1 miles) of telephone company switch.
|Wireless (LMCS)||Access is gained by connection to a high speed cellular like local multi-point communications system (LMCS) network via wireless transmitter/receiver.||30 Mbps or more||Airwaves
Requires outside antenna.
|Can be used for high speed data, broadcast TV and wireless telephone service.|
|Broadband over Power
|Uses existing electrical infrastructure to deliver broadband speeds using BPL “modems”||500Kbps to 3Mbps||Ordinary power lines|| Still an emerging technology, not widely available
Significantly lower deployment costs than comparable technologies like DSL/Cable.
|Satellite||Newer versions have two-way satellite access, removing need for phone line.
In older versions, the computer sends request for information to an ISP via normal phone dial-up communications and data is returned via high speed satellite to rooftop dish, which relays it to the computer via a decoder box.
|6 Mbps or more||Airwaves
Requires outside antenna.
| Bandwidth is not shared.
Satellite companies are set to join the fray soon which could lead to integrated TV and Internet service using the same equipment and WebTV like integrated services
Latency is typically high
Some connections require an existing Internet service account.
Setup fees can range from $500-$1000.
|Frame Relay||Provides a type of “party line” connection to the Internet.
Requires a FRAD (Frame Relay Access Device) similar to a modem, or a DSU/CSU.
|56 Kbps to 1.544 Mbps (or more, depending on connection type)||Various|| May cost less than ISDN in some locations.
Uses one of the connection types below, fractional up to OC3
|Only a portion of the 23 channels available in a T1 line is actually used.||64 Kbps to 1.544 Mbps||Twisted-pair or coaxial cable||Cheaper than a full T1 line with growth options of 56 Kbps or 64 Kbps increments as required.|
|T1||Special lines and equipment (DSU/CSU and router) required.||1.544 Mbps||Twisted-pair, coaxial cable, or optical fiber|| Typically used for high bandwidth demands such as videoconferencing and heavy graphic file transfers.
Minimum for large businesses and ISPs.
|T3||Typically used for ISP to Internet infrastructure.||44.736 Mbps||Optical fiber|
|OC-1||Typically used for ISP to Internet infrastructure within Internet infrastructure.||51.84 Mbps||Optical fiber|
|OC-3||Typically used for large company backbone or Internet backbone.||155.52 Mbps||Optical fiber|