| A virtual private network (VPN) is a method of creating a secure wide area network linking remote offices or individual users via a public telecommunication infrastructure, such as the Internet. The goal of a VPN is to provide the organization with the same capabilities as an expensive network of owned or leased lines, but at a much lower cost. |
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A 1.544 Megabytes-per-second(Mbps) point-to-point dedicated, digital circuit .T1 lines are widely used for private networks as well as interconnections between an organization's PBX or LAN and the telco. A T1 line uses two wire pairs (one for transmit, one for receive) and time division multiplexing (TDM) to interleave 24 64-Kbps voice or data channels. The standard T1 frame is 193 bits long, which holds 24 8-bit voice samples and one synchronization bit with 8,000 frames transmitted per second. T1 is not restricted to digital voice or to 64 Kbps data streams. |
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A 44.736 Mbps point-to-point dedicated line. A DS3 line provides 672 64-Kbps voice or data channels. |
DSL dramatically increases the digital capacity of ordinary telephone lines, providing you with a high-speed constant connection to the internet through your pre-existing connection.
Unlike ISDN, which is also digital but travels through the switched telephone network, DSL provides "always-on" operation. |
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Designed for today's reliable networking hardware, Frame Relay is ahigh-speed packet switching protocol used in wide area networks (WANs). Providing a granular service of up to 45 Mbps, Frame Relay is considerably faster than older X.25 networks. |
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