ADTRAN ATLAS 550 Manual do Utilizador descarregar pdf (Página 246)

Appendix G. Glossary

G-6 ATLAS 550 User Manual 61200305L1-1

IXC

IntereXchange Carrier.Phone companies that connect LECs.

kbps

Kilobits per second. 1,000 bits per second.

LAN

Local area network. A group of computers and peripheral devices connected by a communications

channel, limited by distance.

leased line

A telecommunication facility or link reservedfor the exclusive use of one customer. Also called a ded-

icated line.

LEC

Local Exchange Carrier. Provides local access to public data and phone networks.

LED

Light emitting diode. Alphanumeric characters that glow when supplied with a specified voltage.

Link Integrity Poll

A pollthat occurs each T391seconds to determine the state of theconnection to the frame relayswitch.

LLC2

Logical Link Control Type 2. Upper portion of the Data Link layer (layer 2) that handles flow control

and error control.

LMI

Standard published by the Frame Relay Consortium in 1990 to create a defined interface on the UNI.

The Consortium was composed of Cisco Systems,DEC, Nortel, and StrataCom, and is commonly

referred to as the Group of Four. LMI has become a generic term to indicate the type offrame relay sig-

nalingusedandcouldbeusedtomeanAnnexAorAnnexD.

local loop

In telephony the wire pair that connects a subscriber to a phone company end office, typically contain-

ing two wires. Four-wire local loops are common, however, especially with leased voice grade circuits.

loopback

A diagnostic procedure where data is sent to the device being tested, and the output of the device is

fed directly back to its input, looped around, and the returning data is checked against that which was

sent.

MAC Address

Data link address that is unique for every device that gets connected to a LAN. Devices on the LAN

usetheseaddressestoupdateroutingtables.

Mbps

Mega bits per second. A measure of the amount of information travelling across a network or commu-

nications link.

MIB

Management information base. The MIB is an index to the organized data stored within a network

device.

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ADTRAN ATLAS 550 Manual do Utilizador Página 246