An index of all the common telecoms terms, jargon and acronyms.

Telecommunications Glossary > B

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Part of a network used to connect smaller segments of networks together.


The high-speed communications line to which individual components are connected.


The relative range of frequencies that can be passed by a transmission medium. Greater bandwidths mean a higher information-carrying capacity of the transmission circuit. Bandwidth is usually measured in Hertz (Hz) and is assessed as the number of bits that can be transferred each second.


Transmission scheme in which the entire bandwidth, or data-carrying capacity, of a medium (such as a coaxial cable) is used to carry a single digital pulse, or signal, between multiple users. Because digital signals are not modulated, only one kind of data can be transmitted at a time.

Basic Service

A telecommunications service limited to local switching and transmission.


A measure of the speed of transmission of data; the number of elements transmitted per second.

Bearer Channel (B Channel)

A 64 kilobits per second channel used for information transfer.

BRI – Basic Rate Interface

The ISDN interface standard for single-line ISDN service. This standard provides for two message-bearing 64 Kbps B Channels for speech and data, plus a 16 Kbps D Channel for network signalling and data.

B Channel

Message-bearing 64 Kbps digital channel used for digital transmission of high speed data and video.

BNS – Billed Number Screening

When consumers decide who can and can’t charge a call to their phone, based on an agreement with their local telephone company to screen calls.


The smallest unit of information in the binary system of notation.

Bit Rate

The number of bits transmitted over a telephone line per second.

B-Links, D-Links and B/D Links

The links interconnecting two mated pairs of STPs are referred to as B-Links, D-Links or B/D Links.


The term used to describe a channel with more bandwidth than a standards voice grade channel. Broadband channels are used to carry multiple high-speed voice and data transmissions, on a common communications path.


A device that connects and passes data packets between two network segments.

Bridge Router

A device that can provide the functions of a bridge, router or both concurrently. A bridge/router can route one or more protocols,

B-ISDN – Broadband Integrated Services Digital Network

An evolving standard for the 2nd generation of integrated services digital networks. Broadband ISDN services employ packet switching to integrate voice and data services over a high-speed, packet-based infrastructure.


Data transmitted in short and uneven bursts with relatively long silent intervals between.

Busy Hour

An uninterrupted 60-minute period during which the average volume of telecommunications traffic is at its maximum.

BHCA – Busy Hour Call Attempts

A measure of dynamic traffic calls that can be attempted in an average Busy Hour.

BHCC – Busy Hour Call Completion

A measure of dynamic traffic calls that can be completed in an average Busy Hour.

BLV – Busy Line Verification

A feature that allows an attendant to verify the busy or idle state of telephone lines, and to break into the conversation.

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