Interface Bus terms
"A" to :Asc", "Asy" to "Bc", "Be" to "Bi",
"Bl" to "Cz", "D" to "E", "F" to "L",
"M" to "Mod", "Mu" to "Nu", "O" to "Z"

Asynchronous communications system: A data communications system that uses asynchronous operation. Note 1: In an asynchronous communications system, extra signal elements are usually appended to the data for the purpose of synchronizing individual data characters or blocks. Note 2: The time spacing between successive data characters or blocks may be of arbitrary duration.

Asynchronous network: A network in which the clocks do not need to be synchronous or mesochronous. Synonym non-synchronous network.

ATA Bus. The Advanced Technology Attachment [ATA] was also known as the IDE [Integrated Drive Electronics] bus. The ATA interface was a Parallel bus run over a 40-pin ribbon cable in side the a chassis. the first version, ATA-1 was released in 1994 and the final release was in 2005 as ATA-7. The maximum bus speed was 133MBps. The ATA bus interface connected the Mother board and Hard-Disk-Drive [HDD] together.

Backbone: The high-traffic-density connectivity portion of any communications network. In packet-switched networks, a primary forward-direction path traced sequentially through two or more major relay or switching stations. Note: In packet-switched networks, a backbone consists primarily of switches and inter-switch trunks.

Balanced line: A transmission line consisting of two conductors in the presence of ground, capable of being operated in such a way that when the voltages of the two conductors at all transverse planes are equal in magnitude and opposite in polarity with respect to ground, the currents in the two conductors are equal in magnitude and opposite in direction. Note: A balanced line may be operated in an unbalanced condition. Synonym balanced signal pair.

Bandwidth: [BW] The difference between the limiting frequencies within which performance of a device, in respect to some characteristic, falls within specified limits. The difference between the limiting frequencies of a continuous frequency band.

Bandwidth Allocation Gap: [BAG] A transmission that sends frames at regular intervals. BAG does not allow packets to be sent at the same time by re-scheduling. --Text in review

Basic Rate Interface: [BRI] A CCITT Integrated Services Digital Network (ISDN) multi-purpose user interface standard that denotes the capability of simultaneous voice and data services provided over two clear 64-kb/s channels and one clear 16-kb/s channel (2B+D) access arrangement to each user location.

baud: [Bd] A unit of modulation rate. Note: One baud corresponds to a rate of one unit interval per second, where the modulation rate is expressed as the reciprocal of the duration in seconds of the shortest unit interval. A unit of signaling speed equal to the number of discrete signal conditions, variations, or events per second. Note 1: If the duration of the unit interval is 20 milliseconds, the signaling speed is 50 bauds. If the signal transmitted during each unit interval can take on any one of n discrete states, the bit rate is equal to the rate in bauds times log n. The technique used to encode the 2 allowable signal states may be any combination of amplitude, frequency, or phase modulation, but it cannot use a further time-division multiplexing technique to subdivide the unit intervals into multiple subintervals. In some signaling systems, non-information-carrying signals may be inserted to facilitate synchronization; e.g., in certain forms of binary modulation coding, there is a forced inversion of the signal state at the center of the bit interval. In these cases, the synchronization signals are included in the calculation of the rate in bauds but not in the computation of bit rate. Note 2: Baud is sometimes used as a synonym for bit-per-second. This usage is deprecated.

BCH code: Abbreviation for Bose-Chaudhuri- Hochquenghem code. A multilevel, cyclic, error correcting, variable-length digital code used to correct errors up to approximately 25% of the total number of digits. Note: BCH codes are not limited to binary codes, but may be used with multilevel phase-shift keying whenever the number of levels is a prime number or a power of a prime number, such as 2, 3, 4, 5, 7, 8, 11, and 13. A BCH code in 11 levels has been used to represent the 10 decimal digits plus a sign digit.

PC motherboard

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