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