AT&T System 25 - Manual (Page 418)

GLOSSARY
Covering User
The person at an alternate answering position who answers a
redirected call.
Data Channel
A communications path between two points used to transmit digital
signals.
Data Communications Equipment (DCE)
Refers to a specific RS-232C interface connector configuration. The
DCE devices are designed to interface directly (pin-for-pin) to Data
Terminal Equipment (DTE). The transmit and receive pins are
reversed from that of a DTE interface. A modem is an example of a
DCE device.
Data Dial Code (DDC)
The extension number of a digital data endpoint.
D a t a E n d p o i n t
Two general groups: those having a DTE-type interface, which
encompasses almost all of the data terminal devices, and those
having a DCE interface, which are primarily modems. It should be
noted that within each category, control interfaces may vary. Refer
to Analog Data Endpoint and Digital Data Endpoints for additional
information.
D a t a M o d u l e
A DCE device providing a standard interface between data
equipment and a TN726 Data Line CP port on the switch. Only ADU
Models Z3A1, Z3A2, Z3A4, and Z3A5 are supported.
Data Terminal Equipment (DTE)
DTE refers to a specific RS-232C connector termination designed to
connect directly to a DCE-type connection. Typically associated with
video display terminals, printers, and computers that either originate
or terminate a data transmission path.
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