X

1. The symbol for reactance. See reactance. 2. X. The X series of ITU-T Recommendations. The X series addresses data networks, open systems communication, and security. See X Series.

• CTD (Cell Transfer Delay)
• CTIA
• CTS (Clear To Send)
• CTX (CenTreX)
• CUG (Closed User Group)
• current (I)
• custom calling services
• custom control routing
• customer access line charge (CALC)
• customer contact center
• customer-originated trace
• customer-owned coin-operated telephone (COCOT)
• customer premises equipment (CPE)
• customer rearrangement
• Custom Local Access Signaling Services (CLASS)
• custom ringing
• Cu Symbol for copper.
• cutoff frequency
• cutoff wavelength
• cut-through switch
• CVoDSL (Channelized Voice over Digital Subscriber Line)
• CVSD (Continuously Variable Slope Delta)
• CWDM (Coarse Wavelength Division Multiplexing)
• CWDM (Coarse Wavelength Division Multiplexing)
• cybercafé