Communications Systems Glossary
B channel. The B channel si an integrated services digital network (ISDN) 64 Kbps bearer channel for pulse-code modulated voice or data.
Balanced transmission. Balanced transmission is a transmission mode in which signals are transmitted down a transmission line where the current travels down one conductor and returns on the other.
Band. A band is a range of frequencies.
Band-limited signal. A band-limited signal is a signal whose energy is totally contained within a finite frequency range (band).
Baseband. Baseband describes the transmission of signals without modulation. In a digital baseband network, binary values are transmitted directly onto the transmission line as voltage variations between two values.
Baud rate. The baud rate is a measure of the number of symbols (characters) transmitted per unit of time.
Binary. Binary describes a system having two states that are interpreted as a logical 1 or 0, or "on" or "off".
Bis. The postscript "bis" is used to note the second version of an ITU standard (bis is French for two).
Bit. The term bit is a contraction of binary digit.
Bit rate. The bit rate is the rate at which binary digits (bits) are transmitted.
Bit stuffing. Bit stuffing is the insertion of extra bits into a data stream to avoid the appearance of unintended control sequences that may interfere with a data frame.
Block code. A block code is an error detecting codes where the data is formed into blocks and processed to produce additional information.
Bridge. A bridge is a data-link layer (Layer 2) device that interconnects two local area networks (LANs).
Broadband. The term broadband is used to describe a broad range of frequencies. In communications systems, broadband can also be used to describe a high-capacity communications system.
Broadband integrated services digital network (BISDN). The broadband integrated services digital network (broadband ISDN, or BISDN) is normally associated with the future telecommunications systems based on asynchronous transfer mode (ATM).
Broadcast. To broadcast is to send the same message to a number (normally all) of the network terminals simultaneously.
Broadcast address. A broadcast address is a common address that is used to direct (broadcast) a message to all terminals in a network.
Broadcast message. A broadcast message is a message directed (broadcast) to all users on a network.
Bus topology. A bus is a common shared communications medium for transmitting data.
Byte. A byte is a group of 8 bits.
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