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Glossary and Abbreviations
Issue 5 January 1998 GL-15555-230-024
CSSO
Customer Services Support Organization
CSU
Channel service unit
CTS
Clear to Send
CWC
See call work code.
D
DAC
1. Dial access code or Direct Agent Calling
2. See digital-to-analog converter (DAC).
data channel
A communications path between two points used to transmit digital signals.
data-communications equipment (DCE)
The equipment (usually a modem, data module, or packet assembler/disassembler) on the
network side of a communications link that makes the binary serial data from the source or
transmitter compatible with the communications channel.
data link
The configuration of physical facilities enabling end terminals to communicate directly with each
other.
data module
An interconnection device between a BRI or DCP interface of the switch and data terminal
equipment or data communications equipment.
data path
The end-to-end connection used for a data communications link. A data path is the combination
of all elements of an interprocessor communication in a DCS.
data port
A point of access to a computer that uses trunks or lines for transmitting or receiving data.
data rate
See bit rate.
data service unit (DSU)
A device that transmits digital data on transmission facilities.
data terminal
An input/output (I/O) device that has either switched or direct access to a host computer or to a
processor interface.
data terminal equipment (DTE)
Equipment consisting of the endpoints in a connection over a data circuit. In a connection
between a data terminal and host, the terminal, the host, and their associated modems or data
modules make up the DTE.