1. Glossary and Terms (Download PDF)

2. A usful list of Acronyms 
A B C D E F G H I J K L M N O P Q R S T U V W X   
DA      Destination Address
DB      Database
dB      decibel
DCE     Data Circuit-terminating Equipment
DE      Discard Eligibility (FR)
demux   demultiplex
diffserv       Differentiated Services
DLCI    Data Link Connection Identifier
DMA     Direct Memory Access
DPC     Destination Point Code
DQ      Distributed Queueing
DRAM    Dynamic RAM
DSCP    Differentiated Services Code Point
DSS1    Digital Subscriber Signalling System No. 1
DTE     Data Terminal Equipment
DTMF    Dual Tone Multiple Frequency
DWDM    Dense WDM