Specifications

Model No.
Running Head
D4
A common T1 framing format, consisting of 12 frames. Also known as SF framing.
DACS
Digital Access and Cross-connect System (an electronic digital test access and patching
system)
DCC
Data Communication Channel
DCE
Data Communications Equipment
DCS
Digital Cross-connect System
D-channel
Full-duplex, 16 kbps BRI channel or 64 kbps PRI ISDN channel.
DDS
Digital Data Service
d/i
Drop and Insert, one of the modes of operation for the WAN card.
DID
Direct Inward Dialing
DLC
Digital Loop Carrier
DLCI
Data Link Connection Identifier
DM
Degraded Minutes. Number of minutes with ES, UAS or LOS greater than zero (0).