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Appendix D. Glossary
D-6 T3SU 300 User Manual 61200217L1-1
E1
Transmission rate of 2.048 Mbps on E1 communications lines. See also T1.
end device
The ultimate source or destination of data flowing through a network (some-
times 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.
FDL
facility datalink. FDL bits provide overhead communication between the termi-
nal equipment in ESF framing.
gateway
A device which enables information to be exchanged between two dissimilar
systems or networks.
host computer
The primary or controlling computer in a multiple computer operation.