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Glossary and Abbreviations
Issue 5 January 1998 GL-19555-230-024
domain-controlled station on a call
A station that is active on a call, and which provides event reports over one or two domain-control
associations.
DOSS
Delivery Operations Support System
DOT
Duplication Option Terminal
DPM
Dial Plan Manager
DPR
Dual-port RAM
DS1
Digital Signal Level 1
DS1C
Digital Signal Level-1 protocol C
DS1 CONV
Digital Signal Level-1 converter
DSI
Digital signal interface
DSU
Data service unit
DTDM
Digital-terminal data module
DTE
Data-terminal equipment
DTGS
Direct Trunk Group Select
DTMF
Dual-tone multifrequency
DTS
Disk-tape system
duplicated common control
Two processors ensuring continuous operation of a communications system. While one processor
is online, the other functions as a backup. The backup processor goes online periodically or when
a problem occurs.
duplication
The use of redundant components to improve availability. When a duplicated subsystem fails, its
backup redundant system automatically takes over.
duplication option
A system option that duplicates the following: control carrier containing the SPE, EI circuit packs
in carriers, fiber-optic cabling between port networks, and center-stage switch in a
CSS-connected system.