ADTRAN 1200214L1 Spezifikationen PDF herunterladen (Seite 160)

Appendix D. Glossary

D-2 IQ Probe User Manual 61200214L1-20

bit

A binary digit. A signal, wave, or state is represented as either a

binary 0 or 1.

bits per second (bps)

The number of bits passing a specific point per second. Examples of

common rates are:

• A Kilobit is one thousand bits per second (kbps)

• A Megabit is one million bits per second (Mbps)

bridge

A device that supports LAN-to-LAN communications. Bridges may

be equipped to provide frame relay support to the LAN devices they

serve. A frame relay capable bridge encapsulates LAN frames in

frame relay frames and feeds them to a frame relay switch for trans-

mission across the network. A frame relay capable bridge also

receives frame relay frames from the network, strips the frame relay

frame off each LAN frame, and passes the LAN frame on to the end

device. Bridges are generally used to connect LAN segments to other

LAN segments or to a WAN. They route traffic on the level 2 LAN

protocol (e.g. the Media Access Control address), which occupies the

lower sub-layer of the LAN OSI data link layer. See also router.

byte

Generally, an 8-bit quantity of information, used mainly in referring

to parallel data transfer, semiconductor capacity, and data storage.

Also, it is generally referred to in data communications as an octet or

character.

carrier

The provider of the data service to the customer site. Carriers can be

local telephone companies, regional telephone companies or any

inter-exchange carrier such as AT&T, Sprint, or MCI.

Carrier detect. A signal generated by a modem or DSU/CSU. CD

indicates the presence of a carrier signal on a communications link.

channel bank

Equipment in a telephone central office or customer premises that

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