Digital communication technology for transporting data over
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switched synchronous lines at 56 Kbps, or
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switched asynchronous lines at 57.6 Kbps
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Compression can provide four times the bandwidth
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ISDN offers 2x 64 Kbps channels, switched 56 provides only one 56 Kbps channel.
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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.
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The connection operates like dial-out link
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