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B

BCCH

Also known as: Broadcast Control Channel Broadcast Control Channel (BCCH) is a downlink GSM Broadcast Channel (BCH). The BCCH is transmitted by a Base Transceiver Station (BTS) to provide the signalling information required by the MS (Mobile Station) to access and identify the network. The BCCH will include information such as the LAC (Location Area Code).

BCH

Also known as: Broadcast Channel Broadcast Channels (BCH) are downlink channels in a GSM system and are transmitted by the Base Transceiver Station (BTS). BCH provide signalling information, so that the Mobile Stations (MS) in the cell can locate, synchronise and access the network. Three types of BCH are used: Broadcast Control Channel (BCCH), Synchronisation Channel (SCH), and Frequency Correction Channel

BER

Also known as: Bit Error Ratio, Bit Error Rate Bit Error Rate or Bit Error Ratio (BER) is a measure of the accuracy of transmission for digital information in a telecommunications system. The BER is calculated as the number of bits that were in error, as a proportion of the total number of bits transmitted, or received, or processed over a given period of time. This figure can be used to indicate the Quality of Service for a service provider, and is typically of the order of one error bit in a billion (or 1 in 10 to the power minus 9).

BERT

Also known as: Bit Error Rate Test Bit Error Rate Test (BERT) is a device or test used to determine the Bit Error Rate for a particular transmission. The test is used to discover how many received bits of data were in error, as a ratio of the total number of bits received. The result is usually a very small number, typically one in a billion (or 10 to the power minus 9).

BIOS

basic input output system

BLOG

web log

BPS

bits per second

Band

content Band Go back to BackboneSkip content Also known as: Frequency Band Band (Frequency Band) is a term used in telecommunications to refer to a range of frequencies authorised for specific purposes. Each band will be a continuous spectrum of frequencies, with upper and lower limits, and international use of these bands is regulated by the International Telecommunication Union (ITU) to prevent interference. For example, the medium wave band is approved for several purposes, the most well-known being its use for public service AM (Amplitude Modulation) radio broadcasts

Bandwidth

Bandwidth is a measure of the information carrying capacity of a communications channel, whether it be of the wired or wireless type. In analogue systems bandwidth is measured as a frequency in Hertz (Hz), and it is calculated as the difference between the highest and lowest frequencies of a band. The term bandwidth can apply to various types of equipment, e.g. audio, radio, video, etc., and in each case the bandwidth is calculated by subtracting the lower frequency limit of the band from its upper frequency limit. The range of frequencies that a particular signal will occupy can also be referred to as its bandwidth (as all signals inherently occupy a certain amount of bandwidth), or alternatively it may mean the range of frequencies that a piece of equipment will respond to. Furthermore, because the rate at which digital data flows through a system will depend on the bandwidth, this data rate can also be shown to be a measure of the system's bandwidth. In digital systems the bandwidth is usually described as the maximum transmission speed that a channel will support, and is measured as a data rate in bits per second (bps). If the bandwidth of a system is too narrow for a particular signal to pass through it, then there will be some distortion to that signal, or loss of its information content. Because bandwidth is closely related to the signal frequencies being transmitted, it gives an indication of the capacity of the system to cope with different signals. This means that a wide bandwidth will allow higher data rates, and conversely a narrow bandwidth will restrict the data rate. A voice signal requires only about a 3 kHz bandwidth, whereas a TV video signal needs about 6 MHz of bandwidth, because it contains much more information. Signals outside the band of interest are usually suppressed, in order to prevent interference to or from other equipment. Bandwidth has a general meaning of how much information can be carried in a given time period (usually a second). For example, a broadband link (i.e. one with a wide bandwidth) may be able to carry enough information to present moving video images. If one link or piece of equipment in a communication network has a much smaller bandwidth than the rest, then this will determine the data rate for the whole system

Base Station

Also known as: BS Base Station (BS) is a fixed radio station in the cellular network, which communicates with mobile telephones using radio waves. The Base Station will include transmitters, receivers, tower and antenna, and control equipment to interconnect with other base stations and the public switched network via landline or microwave links. A mobile telephone service consists of a network of many Base Stations, each of which covers one cell or geographical area within a total cellular service area. The Base Station communicates with the mobile phones within its given cell, and then transfers calls to other base stations and the fixed telephone network


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