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Glossary
206
Interphase Corporation
Distributed Function Terminal (DFT)
1) A protocol used for com-
munication between a terminal and an IBM 3270 or IBM 3174 control
unit that allows multiple concurrent logical terminal sessions. 2) A
mode of operation that uses this protocol.
DLC
See
data link control
.
DLCI
See
data link control identifier
.
DMA (Direct Memory Access)
A fast method of moving data
between two subsystems without processor intervention.
DMS/DMS100
The name of a central office switch manufactured by
Northern Telecom. These switches use Custom (proprietary) or
National ISDN-1 (NI-1) software.
DSR, data set ready
RS-232 (V.24) interface control signal, sent
from the data communications equipment to the data terminal equip-
ment on pin 6. Indicates that the DCE is connected to the telephone cir-
cuit. Usually a prerequisite to the DTE issuing request-to-send. (See
.)
DSU
CSU/DSU (Channel Service Unit/ Data Service Unit)
DTE (Data Terminal Equipment)
Equipment serving as the data
source, the data sink, or both. Refers to terminals, computer ports, and
printers. Also interface signals typically presented by this equipment.
DTR (Data Terminal Ready)
RS-232 (V.24) interface control signal,
sent from the data terminal equipment to the data communications
equipment on pin 20. Indicates the DTE is ready for data transmission
and requesting connection of the DCE to the telephone circuit. (See
.)
EIR
Excess Information Rate
EIS
The SNA Server Emulator Interface Specification.
Encapsulation
Process by which an interface device places an end
device’s protocol-specific frames inside a Frame Relay, X.25, or PPP
frame to a frame relay network must perform encapsulation.
ETS
European Telecommunications Standard from ETSI
ETSI
The European Telecommunications Standards Institute
EuroISDN
The European implementation of Q.931, providing a
common standard for ISDN signalling within Europe. Issued by ETSI
under the ETS 300 series standards. Net3(BRI) and Net5(PRI). See
Summary of Contents for ENTIA 5536 DM PRI
Page 34: ...Minimum System Requirements 14 Interphase Corporation...
Page 46: ...Connecting to an MVIP Bus 26 Interphase Corporation...
Page 56: ...Connecting to the Network 36 Interphase Corporation...
Page 90: ...Removing the Drivers 70 Interphase Corporation...
Page 136: ...Verifying COM Ports 116 Interphase Corporation...
Page 172: ...Saving and Editing Frames 152 Interphase Corporation...
Page 182: ...Understanding LoopTest Messages 162 Interphase Corporation...
Page 190: ...Setting Port and Clock Modes 170 Interphase Corporation...
Page 196: ...Interpreting Line Status Indicators 176 Interphase Corporation...
Page 208: ...Procedures 188 Interphase Corporation...
Page 220: ...Europe 200 Interphase Corporation...