Glossary - B



British Approvals Board for Telecommunications.

Backbone Network

A backbone network exists as a transmission facility designed to enable the interconnection of often lower-speed distribution networks, clusters, or channels of dispersed terminals or devices.

Backbone Wiring

In the distribution system of a premises, backbone wiring is the cables that connect the telecommunications closets and equipment rooms within that premises and/or between the buildings of a campus. It is sometimes referred to as the riser subsystem.


Bandwidth is a frequency range. It is usually defined by the number of hertz in a band or between the upper and lower limiting frequencies. Alternatively, it is the frequency range a device is capable of generating, passing, handling or allowing.

Basic X.25

Basic X.25 is a layer-3 packet data communications service. It enables access to an X.25 public switched network (specifically where the access circuit features a continuous or permanent link to the network from the premises of the customer.


The co-efficient which calculates the level of correlation between returns on shares in a given company and stock market returns as a whole. In the Capital Asset Pricing Model, if the firm has a higher a Beta level, there is a greater systematic riskiness of investing in that firmís shares (a Beta coefficient of one implies that the firm is of an average risk).

Binding Post

A binding post is mounted on a terminal box. It is a screw with a small nut. Wires are joined by wrapping them around the screw and then tightening the nut.


Billion instructions per second.


Broadband integrated services digital network.


A bit is the probably the most widely used and fundamental forms of digital signals. The binary digit, or Bit exists as one of a numeration set of two. One of the two amplitude conditions represents a binary digit 1, and the other condition a binary digit 0.

Bit Error Rate (BER)

Bit Error Rate is the ratio representing the number of bits with errors in relation to the total number of bits that have been transmitted. The cheif impairment measurement for channels that are digital are composed of the Bit Error rate and the average numebr of seconds that are error-free.

Bit Rate

The number of Bits per second that a channel will support forms the basis of the capacity characteristic of a digital signal. The capacity characteristic that a digital signal supports is the BIT rate. As an example, a transmission facility that has the capacity to support information exchange at a rate of 1 megabit per second (1,000,000 bits per second or 1 Mbps) can deliver exactly the same quantity of information, as a transmission at 1 kilobit per second (1,000 bits per second or 1kbps) however it can do so in only 1/1000 of the time.


The termination and cabling equipment that is installed between TJF and Distribution Cases in risers and on floors.


A new technological innovation that is designed to be embedded within an electronic device in order to provide a wireless and seamless connection over relatively short distances. Its idea is to provide a far easier alternative to the traditional cable-based interfaces that are currently in use to link computers and peripheral devices. Other devices that have provide an option for Bluetooth chips to be embedded include mobile telephones, headsets, personal digital assistants, and wristwatches.


Basic Rate Interface


A term applied to a telecommunications system that is capable of supporting simultaneously, multiple information formats at a relatively high speed. For example,it provides voice or high-speed data services and video services on demand. Compared to Narrowband systems, overall transmission speeds are generally hundreds to thousands of times faster.

Broadband Integrated Services Digital Network (BISDN)

CCITT is developing a Broadband Integrated Services Digital Network umbrella standard. Its aim is to incorporate underlying standards for the integrated digital network switching, transmission and multiplexing facilities, that can meet expanding voice, video, data and other requirements lasting well into the future. One of the first drafts of the CCITT document, BISDN is defined as "a service requiring transmission channels capable of supporting rates greater than the primary rate". The primary rate for "narrowband" ISDN in the U.S. (as the current standard is often referred to) is 1.544 Mbps.


British Standards Institute. They are responsible for drawing up the standards in the UK against which equipment is designed.

BT Chargecard

This is a BT service that allows customers to bill their calls from any telephone to their personal telephone bill or their credit card.

BT Resellers' Licence

BT issues a copyright license for use of its Phone Base product to its service providers and its independent service providers using its Phone Base to provide a service to the end customer.


The tying of one particular service or product to the supply of another. This can include some situations where supplying the services is linked through using discounts. Please also see full- line forcing.


In a digital system, for example, time division multiplexing equipment, a bus ( which can also be referred to as a highway) is given the definition of one or more conductors (or some form of medium) that connect a group of related devices.


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