Multitech MTPSR1-202ST Betriebsanweisung PDF herunterladen (Seite 89)

Glossary

MTPSR1-202ST

rings are connected by means of bridges. A backbone may be configured as a bus or as a ring. 3. In

a wide area network, a high-speed link to which nodes or data switching exchanges (DSEs) are

connected. 4. A common distribution core that provides all electrical power, gases, chemicals, and

other services to the sectors of an automated wager processing system.

Background: An activity that takes place in the PC while you are running another application. In

other words, the active user interface does not correspond to the ‘background’ task.

Bandwidth: The transmission capacity of a computer channel, communications line or bus. It is

expressed in cycles per second (hertz), the bandwidth being the difference between the lowest and

highest frequencies transmitted. The range of usable frequencies that a transmission medium will

pass without unacceptable attenuation or distortion. Bandwidth is a factor in determining the amount

of information and the speed at which a medium can transmit data or other information.

Backward Explicit Congestion Notification (BECN): A bit that tells you that a certain frame on a

particular logical connection has encountered heavy traffic. The bit provides notification that conges-

tion-avoidance procedures should be initiated in the opposite direction of the received frame. See

also FECN (Forward Explicit Congestion Notification).

Basic Rate Interface (BRI): An ISDN access interface type comprised of two B-channels each at 64

Kbps and one D-channel at 64 Kbps (2B+D).

Bell Operating Companies (BOC): The family of corporations created during the divestiture of

AT&T. BOCs are independent companies which service a specific region of the US. Also called

Regional Bell Operating Companies (RBOCs).

Bell Pub 41450: The Bell publication defining requirements for data format conversion, line condi-

tioning, and termination for direct DDS connection.

Bell Pub 62310: The Bell publication defining requirements for data format conversion, line condi-

tioning, and termination for direct DDS connection.

Binary Synchronous Communication (BSC): A form of telecommunication line control that uses a

standard set of transmission control characters and control character sequences, for binary synchro-

nous transmission of binary-coded data between stations.

Bit (Binary digIT): A bit is the basis of the binary number system. It can take the value of 1 or 0. Bits

are generally recognized as the electrical charge generated or stored by a computer that represent

some portion of usable information.

Bit Error Rate Test (BERT): A device or routine that measures the quality of data transmission. A

known bit pattern is transmitted, and the errors received are counted and a BER (bit error rate) is

calculated. The BER is the ratio of received bits in error relative to the total number of bits received,

expressed in a power of 10.

Bit robbing: The use of the least significant bit per channel in every sixth frame for signaling. The

line signal bits “robbed” from the speech pat conveys sufficient pre-ISDN telephony signaling informa-

tion with the remaining line signal bits providing sufficient line signaling bits for recreating the original

sound. See “robbed bit signaling”.

Blue Alarm: An error indication signal consisting of all 1s indicating disconnection or attached device

failure. Contrast “Red Alarm” and “Yellow Alarm”.

Bps (bits per second): A unit to measure the speed at which data bits can be transmitted or re-

ceived. Bps differs from baud when more than one bit is represented by a single cycle of the carrier.

Bridges: 1. A functional unit that interconnects two local area networks that use the same logical link

protocol but may use different medium access control protocols. 2. A functional unit that intercon-

nects multiple LANs (locally or remotely) that use the same logical link control protocol but that can

use different medium access control protocols. A bridge forwards a frame to another bridge based on

the medium access control (MAC) address. 3. In the connection of local loops, channels, or rings, the

equipment and techniques used to match circuits and to facilitate accurate data transmission.

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