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Search Results: "ISDN"

broadband ISDN (B-ISDN)

A standard for transmitting voice, video and data at the same time over fiber optic telephone lines. Broadband ISDN can support data rates of 1.5 million bits per second (bps), but it has not been widely implemented.

http://www.webopedia.com/TERM/B/broadband_ISDN_B_ISDN.html
IDSL

Short for ISDN Digital Subscriber Line, a method of providing DSL technology over existing ISDN lines. Even though the transfer rates for IDSL are about the same as ISDN (144kbps v.

http://www.webopedia.com/TERM/I/IDSL.html
ISDN - integrated services digital network

An international communications standard for sending voice, video, and data over digital telephone lines or normal telephone wires.

http://www.webopedia.com/TERM/I/ISDN.html



SPID

Acronym for Service Profile Identifier, a number that identifies a specific ISDN line. When you obtain ISDN service, your telephone company assigns a SPID to your line.

http://www.webopedia.com/TERM/S/SPID.html
D-channel

Short for Delta-channel, the channel in an ISDN connection that carries control and signaling information. Basic Rate ISDN (BRI) service consists of two 64 Kbps B-channels, and one D-channel for transmitting control information.

http://www.webopedia.com/TERM/D/D_channel.html
B-channel

Short for Bearer-channel, the main data channel in an ISDN connection. Basic Rate ISDN (BRI) service consists of two 64 Kbps B-channels, and one D-channel for transmitting control information.

http://www.webopedia.com/TERM/B/B_channel.html
PRI

Short for Primary-Rate Interface, a type of ISDN service designed for larger organizations. PRI includes 23 B-channels (30 in Europe) and one D-Channel.

http://www.webopedia.com/TERM/P/PRI.html
BRI

Short for Basic-Rate Interface, the basic ISDN configuration, which consists of two B-channels that can carry voice or data at rate of 64Kbps, and one D-channel, which carries call-control information. Another type of ISDN configuration is called Primary-Rate Interface (PRI), which consists of 23 B-channels (30 in Europe) and one D-channel.

http://www.webopedia.com/TERM/B/BRI.html
Q.931

Q.931 is an ISDN connection control protocol, roughly comparable to TCP in the Internet protocol stack. Q.931 doesn't provide flow control or perform retransmission, because the underlying layers are assumed to be reliable and the circuit-oriented nature of ISDN allocates bandwidth in fixed increments of 64 kbps.

http://www.webopedia.com/TERM/Q/Q_931.html
Dial-Up Modem Standards

Dial-up modems utilize traditional copper phone lines to transmit analog signals. Out of all types of modems - dial-up, ISDN, DSL, cable - dial-up connections offer the slowest transmission speeds.

http://www.webopedia.com/quick_ref/dialup_modem_standards.asp