Avaya 6424D+M User Manual page 124

Glossary DEFINITY Communications System
7400HS Link Data Module
Page G-2 User´s Guide
Data Terminal Equipment (DTE). A device that sends and/or receives data over a
communication line via a DCE device (see also Data Communications Equipment). Examples of
DTE devices are a data display terminal, a PC running appropriate data communications
software, or a printer or plotter.
DCE. See Data Communications Equipment.
DCP. See Digital Communications Protocol.
DDS. See Dedicated Digital System.
Dedicated Digital System (DDS). Need Definition
Digital Communications Protocol (DCP). A proprietary digital protocol used by AT&T PBX
equipment to communicate with AT&T voice terminals and data modules. DCP supports
simultaneous voice and data services over the same line.
DTE. See Data Terminal Equipment.
D8W. A standard modular telephone cord used to connect DCP devices to a PBX wall jack.
Full duplex. A mode of data communications between data endpoints where data can be
transmitted in both directions at the same time.
Handshake mode. An operational mode where a data module is offhook using I-channel mode 2
control frames to communicate with a remote end-point to determine compatibility before
entering the data mode. The 7400HS Link does not support any handshake; it assumes
compatibility and goes directly to the data mode.
Half duplex. A mode of data communications between data endpoints where data is transmitted
in only one direction at a time. To send data, an endpoint turns on its RTS lead and waits for the
CTS lead to turn on before transmitting. For true half duplex operation, the CTS lead will not
turn on while data is being received for the remote endpoint. When the 7400HS Link is in the half
duplex mode, the CTS lead will turn on and data can be transmitted while data is being received
from the remote endpoint.
Hayes compatible. Of a DCE device, using the AT command set and performing in close
compliance with the configuration and operating standards established by Hayes Microcomputer
Products, Inc.
See also AT command set.
Idle mode. An operational mode in which the 7400HS Link is on-hook waiting for an incoming
call or a call to be originated.
Non-volatile memory. A read/write memory device that retains data after power is removed.
Options. Parameters that are stored in memory and control the operation of the 7400HS Link,
such as data speed.