Data communication and computer
networks
modem (modulator demodulator) - ANS-converts the digital data from a computer to analog
signals in the voice range
overall bit rate of a communication link - ANS-combination of the rate at which signals (or
symbols) can be transmitted and the efficiency with which digital information (in the form of bits)
is encoded in the symbols
DSL - ANS-Digital Subscriber Line
ISDN - ANS-Integrated Services Digital Network
Frame Relay - ANS-network protocol designed for sending digital information over shared,
wide-area networks (WANs)
Asynchronous Transfer Mode (ATM) - ANS-protocol designed for sending streams of small,
fixed-length cells of information (each 53 bytes long) over very high-speed dedicated
connections, most often digital optical circuits
local area network (LAN) - ANS-allows local data communication without involving the
telephone company or network access provider, LANs are limited to operating within a
geographical area of at most a few miles and often are restricted to a specific building or a
single department. Separate remote LANs may be connected by bridges, routers, or switches
file servers - ANS-computers dedicated to storing local files, both shared and private
coaxial cables - ANS-communication medium that could deliver reliable, high-speed
communications
twisted pair wires (Cat 5 and better quality) - ANS-inexpensive and has a high bandwidth
(capacity for information transmission)
fiber optic cable - ANS-offers the highest bandwidth (over 1 billion bps or 1 Gbps) and a high
degree of reliability because it uses light waves to transmit information signals and is not
susceptible to electrical interference
Broadband - ANS-is adapted from the technology for transmitting cable television. A broadband
LAN can transmit multiple signals simultaneously, providing a unified environment for sending
networks
modem (modulator demodulator) - ANS-converts the digital data from a computer to analog
signals in the voice range
overall bit rate of a communication link - ANS-combination of the rate at which signals (or
symbols) can be transmitted and the efficiency with which digital information (in the form of bits)
is encoded in the symbols
DSL - ANS-Digital Subscriber Line
ISDN - ANS-Integrated Services Digital Network
Frame Relay - ANS-network protocol designed for sending digital information over shared,
wide-area networks (WANs)
Asynchronous Transfer Mode (ATM) - ANS-protocol designed for sending streams of small,
fixed-length cells of information (each 53 bytes long) over very high-speed dedicated
connections, most often digital optical circuits
local area network (LAN) - ANS-allows local data communication without involving the
telephone company or network access provider, LANs are limited to operating within a
geographical area of at most a few miles and often are restricted to a specific building or a
single department. Separate remote LANs may be connected by bridges, routers, or switches
file servers - ANS-computers dedicated to storing local files, both shared and private
coaxial cables - ANS-communication medium that could deliver reliable, high-speed
communications
twisted pair wires (Cat 5 and better quality) - ANS-inexpensive and has a high bandwidth
(capacity for information transmission)
fiber optic cable - ANS-offers the highest bandwidth (over 1 billion bps or 1 Gbps) and a high
degree of reliability because it uses light waves to transmit information signals and is not
susceptible to electrical interference
Broadband - ANS-is adapted from the technology for transmitting cable television. A broadband
LAN can transmit multiple signals simultaneously, providing a unified environment for sending
