（单词翻译:单击）
DCE
data circuit terminating equipment
DCP
digital communications protocol2
DCS
digital cross-connect system
DDD
direct distance dialing
DDN
Digital L is another amplitude4 condition that represents a binary5 digit 0. See binary digit or bit.
Digital Carrier Systems
Digital Carrier Systems are carrier systems for digital signals that uses regenerative versus6 linear repeaters and time division multiplexing.
Digital Cross Connect System (DCS)
DCS is a new generation of switching/multiplex equipment that permits per-channel DS0 (64 kbps) electronic cross-connection from one T1 transmission facility to another, directly from the constituent7 DSl signals. Commonly referred to as "DACS" (digital access and cross connect system), although this is a trademark8 of AT&T.
Digital Signal
A digital signal is a signal (electrical or otherwise) in which information is carried in a limited number of different (two or more) discrete9 states. The most fundamental and widely used form of the digital signal is binary, in which one amplitude condition represents a binary.
Digital Termination Service (DTS)
DTS is a service provided by some carriers permitting opera tors of private networks to use digital microwave equipment to gain access to carrier net works. The FCC has allocated10 a special microwave band for DTS.
