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Technical Glossary A - B


10Base-T - Technical name for Ethernet twisted-pair wiring, at 10mbps.

100Base-T - Technical name for Ethernet twisted-pair wiring, at 100mbps.

2B1Q - Two Binary, one Quaternary. A line coding technique that compresses two binary bits of data into one time state as a four- code.

AAC - ACCULINK Access Controller. An extremely versatile TI/El multiplexer that provides a flexible, highly functional interface between the customer's equipment and public network voice and data services. Sold and supported exclusively by Lucent Technologies.

AAL5 - ATM Adaption Layer 5. AAL5 has been adapted by the ATM Forum for a Class of Service called High Speed Data Transfer.

Adaptive Differential Pulse Code Modulation (ADPCM) - A PCM encoding technique that uses only 4 bits to encode an analog sample. By adapting the quantizing range to the difference between the two samples, it achieves the same voice quality as 8-bit PCM, but with 32 Kbps instead of 64 Kbps.

ADSL - Asymmetric Digital Subscriber Line. A high-speed transmission technology using existing twisted-pair lines that permits simultaneous POTS and high-speed data communication. A much higher data rate is employed downstream than upstream.

Advanced Diagnostic Protocol (ADP) - The network management protocol used by the COMSPHERE 6700 Series NMS. It provides diagnostic communication for the network.

AIX - Advanced Interactive Executive. IBM's implementation of UNIX.

A-Law - A CEPT standard algorithm that describes the nonlinear compression performed in the analog-to-digital conversion process of PCM systems used in Europe and most other countries. See Mu-law.

American Standard Code for Information Interchange (ASCII) - The character-oriented code widely used in data processing and data communications systems.

AMI - Alternate Mark Inversion. A line coding technique used to accommodate the ones density requirements of El or T I lines.

AN - Access Node. See Node.

Analog - A signal that varies continuously with respect to time. Conventional telephones and modems transmit analog signals. The digital or pulse output from a computer must be converted to an analog signal for transmission on these lines.

Analog Private Line (APL) - A dedicated or leased (not dial-up) line. Users pay a flat fee and have use of the line 24 hours a day.

ANSI - American National Standards Institute. Accredits and implements standards. Member of ISO.

Asynchronous Transmission - In data transmission, each character is individually synchronized, usually by start bits and stop bits. Timing information is usually included in the transmitted character.

ATM - Asynchronous Transfer Mode. A high-bandwidth, low- connection-oriented switching and multiplexing technique using fixed-sized cells.

Attenuation - The dissipation of the power of a transmitted signal as it travels over a wire.

ATU - ADSL Transceiver Unit. The ADSL Forum uses terminology for DSL equipment based on the ADSL model for which the Forum was originally created. The DSL endpoint is known as the ATU-R, and the CO unit is known as the ATU-C. These terms have since come to be used for other types of DSL services, including RADSL, MSDSL and SDSL. ATU now represents xDSL services.

ATU-C- ATU - Central Office. An ATU at the carrier's central office in support of DSL-based services.

ATU-R - ATU - Remote. Equipment placed at the customer premises in support of DSL-based services.

Auxiliary Backplane - An eight-slot backplane that fits over one- of the open section of the 3000 Series Carrier. This is a passive assembly that provides interconnect capability between 3151 CSUs and 3161 DSU/CSUs, the network, and the customer premise equipment (CPE).

AWG - American Wire Gauge. An indication of wire size. The heavier the gauge, the lower the AWG number and the lower the impedance.

B8ZS - See Binary with Eight Zero Suppression

Backbone - Equipment that provides connectivity for users of distributed network and includes the network infrastructure.

Backbone LAN - A transmission facility designed to connect two or more LANs.

Backbone Network - A high-capacity transmission facility or arrangement of such facilities designed to interconnect lower-speed channels or clusters. The NMS definition is a primary route from a control DSU or modem to its first tributary when the communications network contains extended controls.

Backplane - The high-speed communications bus which individual components, especially slide-in cards, are connected. The backplane's capacity determines the overall capacity of the device.

Bandwidth - The carrying capacity or size of a communications channel; usually expressed in hertz (cycles per second) for analog circuits (the original meaning of the term) or in bits per second (bps) for digital circuits (newer meaning). The difference between the highest and lowest frequencies of a band that can be passed by a transmission medium without undue distortion.



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