Glossary
Glossary-10
PortMaster Configuration Guide
digital service unit
See
DSU
.
direct memory access
See
DMA
.
DLCI
Data link connection identifier. A unique number that represents a particular permanent
virtual circuit (PVC) on a particular physical segment of the Frame Relay network. As the
frame is passed through each switch, the DLCI is remapped automatically by the switch as
necessary.
DMA
Direct memory access. Transfer of data from a peripheral device, such as a hard disk drive,
into a computer memory without mediation by a microprocessor.
DNS
Domain Name System. The system used on the Internet for translating the names of
network hosts into IP addresses.
DRAM
Dynamic random access memory. A type of semiconductor random access memory
(RAM) that stores information in integrated circuits containing capacitors.
DSR
Data Set Ready. The circuit that is activated when data communications equipment
(DCE) is powered up and ready for use. See also
DCE
.
DSU
Digital service unit or data service unit. An ancillary device needed to adapt the physical
interface on a data terminal equipment (DTE) device—such as a V.35 interface on a
port—to a transmission facility—such as leased line or a Frame Relay switch. If the DTE
lacks complete digital line interface capability, the DSU can be located with the channel
service unit (CSU) on the customer’s site and known as a CSU/DSU. See also
CSU
.
Summary of Contents for PortMaster
Page 16: ...Contents xvi Configuration Guide for PortMaster Products...
Page 26: ...Subscribing to PortMaster Mailing Lists xxvi PortMaster Configuration Guide...
Page 32: ...Basic Configuration Steps 1 6 PortMaster Configuration Guide...
Page 114: ...Configuring WAN Port Settings 6 12 PortMaster Configuration Guide...
Page 128: ...Configuring Login Users 7 14 PortMaster Configuration Guide...
Page 158: ...Restricting User Access 9 16 PortMaster Configuration Guide...
Page 168: ...Configuring Ports for Modem Use 10 10 PortMaster Configuration Guide...
Page 222: ...Frame Relay Subinterfaces 13 16 PortMaster Configuration Guide...
Page 236: ...Troubleshooting a Synchronous V 25bis Connection 14 14 PortMaster Configuration Guide...
Page 252: ...Using ISDN for On Demand Connections 15 16 PortMaster Configuration Guide...
Page 264: ...Using ISDN for Internet Connections 16 12 PortMaster Configuration Guide...
Page 276: ...Configuration Steps for Dial In Access 17 12 PortMaster Configuration Guide...
Page 286: ...Configuration Steps for Shared Device Access 18 10 PortMaster Configuration Guide...
Page 296: ...Troubleshooting a Leased Line Connection 19 10 PortMaster Configuration Guide...
Page 310: ...B 4 PortMaster Configuration Guide...
Page 352: ...Command Index Command Index 6 PortMaster Configuration Guide...