GLOSSARY D

The Glossary defines technical terms and abbreviations used in this manual.

ADSL

Asymmetric Digital Subscriber Line. A method of transmitting at different downstream and

 

upstream speeds.

Asymmetric

Transmission which sends data at different rates in each direction.

Transmission

 

ATU-C

ADSL Terminal Unit at the service provider site.

ATU-R

ADSL Terminal Unit at the remote site.

Bandwidth

Used to describe the capacity or amount of traffic (data, voice, or video) a certain

 

communications line is capable of accommodating.

BER

Bit Error Rate. The ratio of received bits that are in error.

Binder Group

A group of 25 or 50 pairs of wires.

Bit

In a binary system, the smallest unit of information. It is represented as a zero or a one.

Bridge

A two-port internetworking device that selectively filters or forwards traffic based or MAC

 

addresses.

Bridged

A pair of wires connected in parallel across a single line to form a "T" Tap configuration.

Downstream

The direction of data reception from the Megabit Modem 310F to the Megabit Modem 320F.

Ethernet

A baseband LAN specification that has become a series of standards produced by IEEE

 

referred to as IEEE 802.3.

HDLC

High-level Data Link Control.

Hub

A common wiring point for star-topology networks, and a common synonym for a

 

concentrator.

IEEE

Institute of Electrical and Electronics Engineers. A professional organization that defines

 

network standards.

kbps

Kilobits per second. A measure of transmission speed at 1,000 bits per second.

kpps

Kilo packets per second.

LAN

Local Area Network. The means by which a local community of users and workgroups can

 

share information and resources electronically.

LED

Light emitting diode.

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