imported>CoolieCoolster: Added non-breaking space to non-template file size, frequency, bitrate, and bandwidth values (via WP:JWB)

2024-04-26T01:07:12Z

Added non-breaking space to non-template file size, frequency, bitrate, and bandwidth values (via WP:JWB)

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{{Short description|Data network protocol}}
{{Redirect|SMDS|Surface-mount devices|Surface mount technology}}
'''Switched Multi-megabit Data Service (SMDS)''' was a [[connectionless]] service used to connect [[LAN]]s, [[Metropolitan area network|MAN]]s and [[Wide area network|WAN]]s to exchange data, in early 1990s. In Europe, the service was known as '''Connectionless Broadband Data Service (CBDS)'''.<ref name = "McDysan 1999"/>{{rp|510}}

SMDS was specified by Bellcore,<ref name="TR-TSV-000772"/><ref name="TR-TSV-000773"/><ref name="TR-TSV-000774"/> 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 network|Distributed Queue Dual Bus]] layer-2 switching arbitrator, and standard [[SONET]]<ref name="GR-253"/> 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.<ref name = "McDysan 1999"/>{{rp|510}} 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.<ref name = "McDysan 1999"/>{{rp|214}} In the mid-1990s, SMDS was replaced, largely by [[Frame Relay]].

==References==
{{Reflist|refs=
<ref name = "McDysan 1999">{{cite book |last=McDysan |first=David E. |author2=Darren L. Spohn |title=ATM Theory and Applications |year=1999 |publisher=McGraw-Hill |location=Montreal |isbn=0-07-045346-2}}</ref>
<ref name="TR-TSV-000772">[http://telecom-info.njdepot.ericsson.net/site-cgi/ido/docs.cgi?ID=259205889SEARCH&DOCUMENT=TR-TSV-000772; TR-TSV-000772] ''Generic System Requirements in Support of Switched Multi-Megabit Data Service'', Telcordia.</ref>
<ref name="TR-TSV-000773">[http://telecom-info.njdepot.ericsson.net/site-cgi/ido/docs.cgi?ID=259205889SEARCH&DOCUMENT=TR-TSV-000773; TR-TSV-000773] ''Local Access System Generic Requirements, Objectives, and Interfaces in Support of Switched Multi-Megabit Data Service'', Telcordia.</ref>
<ref name="TR-TSV-000774">[http://telecom-info.njdepot.ericsson.net/site-cgi/ido/docs.cgi?ID=259205889SEARCH&DOCUMENT=TR-TSV-000774; TR-TSV-000774] ''Switched Multi-Megabit Data Service (SMDS) Operations Technology Network Element Generic Requirements'', Telcordia.</ref>
<ref name="GR-253">[http://telecom-info.njdepot.ericsson.net/site-cgi/ido/docs.cgi?ID=SEARCH&DOCUMENT=GR-253& GR-253] ''SONET Transport Systems: Common Generic Criteria'', Telcordia.</ref>
}}

== External links ==
* [http://docwiki.cisco.com/wiki/Switched_Multimegabit_Data_Service Cisco guide to SMDS]
* [http://www.protocols.com/pbook/smds.htm SMDS | SIP Protocol]

[[Category:Computer networking]]

{{compu-network-stub}}

Switched Multi-megabit Data Service - Revision history

imported>CoolieCoolster: Added non-breaking space to non-template file size, frequency, bitrate, and bandwidth values (via WP:JWB)