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CSMA 
CSMA/CA 
CSMA/CD 
CSU 
C2W 
CTX 
cursor 
curvature loss 
curve-fitting compaction 
customer access 
customer management complex 
customer office terminal 
customer owned and maintained equipment (COAM) 
customer premises equipment (CPE) 
customer-provided equipment 
customer service unit (CSU) 
custom local area signaling service (CLASS) 
cutback technique 
cutoff attenuator 
cutoff frequency 
cutoff mode 
cutoff wavelength 
cutover 
CVSD 
cw 
CX 
cxr 
CX signaling 
cyclic distortion 
cyclic redundancy check (CRC) 
D* 
D-A 
D-A 
DACS 
DAMA 
damping 
dark current 
data 
data access arrangement 
data attribute 
data bank 
database 
database engineering 
database management system (DBMS) 

deep space 
de facto standard 
default 
Defense Communications System (DCS) 
Defense Data Network (DDN) 
Defense Switched Network (DSN) 
definition 
deflection

 data burst 
data bus 
data circuit connection 
data circuit-terminating equipment 
data collection facility 
data communication 
data communication control procedure 
data communications control character 
data communications equipment 
data compaction 
data compression 
data concentrator 
data conferencing repeater 
data contamination 
data corruption 
data country code 
data-dependent protection 
data dictionary 
data directory 
data element 
Data Encryption Standard (DES) 
data forwarder 
datagram 
data integrity 
data item 
data link 
data link escape character (DLE) 
Data Link Layer 
data logging 
data management 
data management system 
data medium 
data mode 
data network identification code (DNIC) 
data numbering plan area (DNPA) 
data phase 
data processing 
data rate 
data register 
data scrambler 
data security 
data service unit (DSU) 
data set 
data signaling rate (DSR) 
data signaling rate transparency 
data sink 
data source 
data station 
data stream 
data subscriber terminal equipment 
data switching exchange (DSE) 
data terminal equipment 
data transfer rate 
data transfer request signal 

data transfer time 
data transmission 
data transmission circuit 
data volatility 
date 
date-time group (DTG) 
dating format 
dB 
dBa 
dBa(F1A) 
dBa(HA1) 
dBa0 
dBc 
dBi 
dBm 
dBm(psoph) 
DBMS 
dBmV 
dBm0 
dBm0p 
dBr 
dBrn 
dBrn adjusted 
dBrnC 
dBrnC0 
dBrn(f 1 -f 2 ) 
dBrn(144-line) 
dBv 
dBW 
dBx 
dc 
DCA 
DCE 
DCE clear signal 
DCE waiting signal 
D channel 
dc patch bay 
DCS 
DDD 
DDN 
deadlock 
dead sector 
dead space 
debug 
deception 
deception repeater 
decibel 
decipher 
decision circuit 
decision instant 
decode 
decollimation 
decrypt 
dedicated circuit 
dedicated service 
deemphasis 
deeply depressed cladding fiber