Basic HTML version of Foils prepared 5 February 98

Foil 94 Switched 56 K

From Introduction to Networking Technologies CPS640 MultiMedia and Networking -- Spring Semester 1998. by Roman Markowski


Digital communication technology for transporting data over
  • switched synchronous lines at 56 Kbps, or
  • switched asynchronous lines at 57.6 Kbps
Compression can provide four times the bandwidth
ISDN offers 2x 64 Kbps channels, switched 56 provides only one 56 Kbps channel.
Switched 56 is digital and do not require modem. Instead, CSU/DSU is required to attach bridge/router to the line installed by a phone company. At each end CSU/DSU is required. A typical connection between CSU/DSU and router/bridge is V.35 serial cable.
The connection operates like dial-out link



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