ADTRAN Express 6120 Manual de instrucciones descargar pdf (Pagina 146)

Glossary

Glossary-6 Express 6100/6120 User Manual 61200176L1-1

jitter

Theslightmovementofatransmissionsignalintimeorphasethatcan

introduce errors and loss of synchronization for high-speed synchro-

nous communications. See phase jitter.

LATA

Local Access and Transport Area. One of 161local telephone serving

areas in the United States, generally encompassing the largest stan-

dard statistical metropolitan areas. Subdivisions established as a re-

sult of the AT&T divestiture that now distinguish local from long

distance service. Circuits with both end-points within the LATA (in-

traLATA) are generally the sole responsibility of the local telephone

company, while circuits thatcross outside the LATA(interLATA) are

passed on to an interexchange carrier.

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, andthereturningdata is checked against thatwhich wassent.

Media Access Control (MAC)

As defined by the IEEE, the lower of the two sublayers of the OSI ref-

erence model data link layer. The MAC sublayer is concerned with

media access issues, such as whether token passing or contention is

used.

message

The Layer3 information that is passedbetween theCPE andSPCS for

signalling.

multipoint line

A communications line having multiple cable access points.

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ADTRAN Express 6120 Manual de instrucciones Pagina 146