AT&T System 75 Wiring Diagram page 331

CHAPTER 6. GLOSSARY
Central Office Trunk
A telecommunications channel that provides access from the switch
to the public network through the local central office.
Channel
A communications path for transmitting voice and data.
Common Control Switching Arrangement (CCSA)
A private telecommunications network using dedicated trunks and a
shared switching center for interconnecting company locations.
Console
See Attendant Console.
Data Channel
A communications path between two points used to transmit digital
signals.
Data Communications Equipment (DCE)
The equipment on the network side of a communication Iink that
provides all the functions required to make the binary serial data
from the source or transmitter compatible with the communications
channel.
Data Terminal Equipment (DTE)
Equipment comprising the source or sink of data, or both, that also
provides communication control functions (protocol). The DTE is any
piece of equipment at which a communications path begins or ends.
Digital Communications Protocol (DCP)
Defines the capability for providing simultaneous voice and data
transmission over the same channel.
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