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-6 Glossary
Model No.
Running Head
CSA
Carrier Serving Area
CSC
Common Signaling Channel
CSU
Channel Service Unit, an interface to a T1 line that terminates the local loop.
CTE
Channel Terminating Equipment (Network)
CTS
Clear To Send, a lead on an interface indicating that the DCE is ready to receive data.
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