SMDS
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Switched Multi-megabit Data Service (SMDS) was a connectionless service used to connect LANs, MANs and WANs to exchange data, in early 1990s. In Europe, the service was known as Connectionless Broadband Data Service (CBDS).[1]
SMDS was specified by Bellcore,[2] and was based on the IEEE 802.6 metropolitan area network (MAN) standard, as implemented by Bellcore, and used cell relay transport, Distributed Queue Dual Bus layer-2 switching arbitrator, and standard SONET[3] or G.703 as access interfaces.
It is a switching service that provides data transmission in the range between 1.544 Mbit/s (T1 or DS1) to 45 Mbit/s (T3 or DS3). SMDS was developed by Bellcore as an interim service until Asynchronous Transfer Mode matured.[1] In the mid-1990s, SMDS was replaced, largely by Frame Relay.
SMDS was notable for its initial introduction of the 53-byte cell and cell switching approaches, as well as the method of inserting 53-byte cells onto G.703 and SONET.[4] Note that the abbreviation searched for was SMD not SMDS
Notes
References
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- Bellcore. Generic System Requirements in Support of a Switched Multi-Megabit Data Service. Technical Advisory, TA-TSY-000772; October 1989.
- Bellcore. Local Access System Generic Requirements, Objectives, and Interface Support of Switched Multi-Megabit Data Service. Technical Advisory TA-TSY-000773, Issue 1; December 1985.
- Bellcore. Switched Mutli-Megabit Data Service (SMDS) Operations Technology Network Element Generic Requirements. Technical Advisory TA-TSY-000774.
- Telcordia. Generic Requirements for SONET. GR-253
External links
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