Switched 56

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Also found in: Acronyms.

Switched 56

A dial-up digital service provided by local and long distance telephone companies. There is a monthly fee and per-minute charge like the analog voice network. For connection, a DSU/CSU is used instead of a modem. Switched 56 uses a 64 Kbps channel, but one bit per byte is used for band signaling, leaving 56 Kbps for data.
References in periodicals archive ?
ISDN -- A switched digital service that acts like both an analog and a digital data connection.
ISDN, or switched digital service, plays a starring role; the high-speed lines make online activities and interactive video-based telelearning practical enough for everyday instruction and collaboration with peers.
Today, after a year of deploying three IDB-64 units in Garden City, the company has not only achieved a successful network disaster recovery strategy, but is also experiencing a consistent minimum of 40% monthly savings in maintenance costs over its former switched digital service.
* Switched digital service, allowing telecomputing and interactive telelearning capability, will be made available to all public K-12 schools, public libraries, and community colleges in Pacific Bell's service territory by the end of 1996.

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