circuit switch

A circuit switch establishes connections between links, on demand and as available, in

order to establish an end-to-end circuit between devices.The connections are temporary, continuous, and exclusive in nature. The connections are temporary as they are established and maintained only for the duration of the logical session, or call.They are continuous as they provide a specific amount of bandwidth, or capacity, continuously for the duration of the call.They are exclusive as the connection and the associated bandwidth are committed to only that call, i.e., are not shared with other transmissions. Circuit switches were developed for uncompressed, realtime voice communications, but will support any type of information transfer. Common examples of circuit switches include Private Branch Exchanges (PBXs) and Central Office Exchanges (COs or COEs). See also circuit, CO, cordboard, ECC, packet switch, PBX, switch, switchboard, SxS, and Xbar.

• Table J-1: Japanese Digital Hierarchy: J-carrier
• Table L-1: Longitudinal Redundancy Check (LRC)
• Table M-1: International Morse Code
• Table O-1: OSI Reference Model Layers
• Table O-2: G.709 Line Rates and Corresponding SDH/SONET Line Rates
• Table P-1: Evolution of PBX technology
• Table P-2: Military and Aviation Phonetic Alphabet
• Table Q-1: Selected ITU-T Q-Series Recommendations
• Table R-1: Before and After: Bell Operating Companies (BOCs) and Regional Bell Operating
• Table R-1: Before and After: Bell Operating Companies (BOCs) and Regional Bell Operating
• Table R-2: Coaxial Cable Types
• Table S-1: SDTV Scanning Formats
• Table S-2: SONET/SDH Signal Hierarchy
• Table T-1: North American Digital Hierarchy: T-carrier
• Table T-2: TCP/IP Protocol Suite
• Table V-1: Electromagnetic Signal Propagation Velocity (Approximate)
• Table V-2: Vertical Redundancy Check (VRC)
• Table V-3: Selected ITU-T V-Series Recommendations
• Table W-1: ITU-T Transmission Windows
• Table X-1: DSL Technology Comparisons
• Table X-2: ITU-T X Series Recommendation Groups
• Table X-3: Select X Series Recommendations
• TACS (Total Access Communications System)
• Tagged Image File Format-Fax (TIFF-F)
• Tagged Image File Format (TIFF)