
Appendix D. Glossary
DCE
data communications equipment. Device that provides all the functions required for connection to telephone company lines and for converting signals between telephone lines and DTE. Also see DTE.
DDS
digital data service. A private line digital service for transmitting data
delay
The amount of time by which a signal is delayed. A
DLCI
datalink communications identifier. A unique number assigned to a PVC end point in a frame relay network. Identifies a particular PVC endpoint within a user's access channel in a frame relay network and has local significance only to that channel.
DS1
digital signal level one.
DS3
digital signal level three. Equivalent of 28 DS1s and 672 DS0s (total bandwidth is 44.736 Mbps).
DSU
data service unit. A device designed to transmit and receive digital data on digi- tal transmission facilities.
DTE
data terminal equipment. The
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