ISI (InterSymbol Interference)

Signal distortion caused by the overlap of symbols (i.e., the smallest

units transmitted) in a digital transmission system. Intersymbol interference includes the overlap of bits in a purely digital transmission system, such as a fiber optic transmission system (FOTS), or sinusoidal waveforms in a digital system involving the modulation of a carrier waveform, such as a T-carrier or E-carrier system. See also pulse dispersion.

74570c09.qxd 9/11/07 12:22 PM Page 262

• pizza box
• PKI (Public Key Infrastructure)
• PKM (Privacy Key Management)
• plain old telephone service (POTS)
• plain text
• plastic optical fiber (POF)
• platform independent
• PLB (Personal Locator Beacon)
• PLC (PowerLine Carrier)
• plenum
• plenum cable
• plesiochronous
• plesiochronous
• Plesiochronous Digital Hierarchy (PDH)
• Plesiochronous Digital Hierarchy (PDH)
• PLP (Packet Layer Protocol)
• plug
• Plug and Play (PnP)
• plug ’n’ play (plug and play)
• PM
• PMD (Polarization Mode Dispersion)
• PMI (Property Management Interface)
• PNG (Portable Network Graphics)
• PNNI
• PnP (Plug and Play)