PSS1 (Private Signaling System No. 1)

The ISO (International Organization for Standardization)

mirror standard for the ITU-T Q Signaling (QSIG) standard. Formally known as Q.931, QSIG is a standard that defines services and signaling protocols for interconnecting TDM-based PBXs. QSIG is a Common Channel Signaling (CCS) protocol that runs over the ISDN D-channel for signaling between nodes in a Private Integrated Services Network (PISN). See also ISO, PBX, PISN, and QSIG.

• long haul circuit
• longitudinal redundancy checking (LRC)
• long wavelength band (L-Band)
• long wavelength (LW)
• loop
• loop
• loopback address
• loopback address
• loopback test
• loop current
• loop start
• loose-tube cable
• LOS (Line-of-Sight)
• loss
• loss budget
• lossless compression
• lossy compression
• low delay code excited linear prediction (LD-CELP)
• low earth orbit (LEO)
• low frequency (LF)
• Low Income Consumers Program
• low-order mode
• low-pass filter
• Low-Power Radio Service (LPRS)
• Low-Power Radio Service (LPRS)