Appendix D. Glossary

DSU

Data service unit. A device designed to transmit and receive digital data on digi- tal transmission facilities.

DTE

Data terminal equipment. The end-user terminal or computer that plugs into the termination point (DCE) of a communications circuit. The main difference between the DCE and the DTE is that pins two and three are reversed.

E1

Transmission rates of 2.048 Mbps are available on T1 communication lines. See also T1.

end device

The ultimate source or destination of data flowing through a network (sometimes referred to as DTE).

end user

Subscriber who uses (rather than provides) telecommunications services.

ES

Errored seconds. A second with one or more coding violations (CVs).

ethernet

Transmission protocol for packet-switching LANs.

facilities

The equipment used by carriers to provide communication services.

far end

The distant end to that being considered. Not the end where testing is being car- ried out.

FCC

Federal Communications Commission. The U.S. federal agency responsible for regulating interstate and international communications by radio, TV, wire, satel- lite, and cable.

D-6

MX2800 STS-1 User Manual

61200659L1-1

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