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10 Cards in this Set
- Front
- Back
ISDN can reach speeds of 128Kbps
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DSL (Digital subscriber line) can reach speeds up to 9Mbps.
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Cable modem can reach 2Mbps. Works with coax cable.
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Kbps = kilobits per second = one thousand bits per second.
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Mbps - megabits per second = one million bits per second
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Gbps - gigabits per second = one billion bits per second
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Tbps - terabits per second = one trillion bits per second.
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Four topologies: star, bus, ring, and mesh
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T1 lines have a transmission rate of 1.544 Mbps with 24 multiplexed 64-Kbps channels.
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Fractional T1 is based on 64-Kbps channels.
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T3 has a transmission rate of 44.736Mbps. uses two lines for sending and receiving simultaneously.
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E1 through E5 are European equivalents. E1 is similar to T1, except that it carries a higher rate of 2.048 Mpbs on 32 64Kbps channels.
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Frame Relay uses Permanent Virtual Circuits (PVCs) to establish stable end-to-end connections. Most commonly used Internet technology.
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ATM can transmit data in excess of 600Mbps. It's the backbone of most major telecom companies.
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ISDN uses copper wires. ISDN BRI (basic rate interface) has two 64Kbps B-channels for data or voice (129 Kbps) and one 16Kbps D-channel for control.
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ISDN PRI (primary rate interface) has twenty-three 64Kbps B-channels and one 64Kbps chaannel for control.
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Broadband ISDN supports HDTV and uses ATM. (622Mbps)
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DSL is more than 50 times faster than a 28.8 modem. Must be close to the telecom CO.
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SONET (synchronous Optical Network) Ranges from 51.84Mbps all the way up to 50Gbps.
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SDH (Synchronous Digital Hierarchy) is a standard for synch data transmision on optical media. Euro equivalent of SONET. Goes from 155Mbps to 10Gbps.
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