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交换式多兆位数据服务

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交换式多兆位数据服务(英语:Switched Multi-megabit Data Service,缩写SMDS)是一项1990年代早期用于连接LANMANWAN以交换数据的无连接服务。在欧洲,该服务被称为无连接宽频数据服务(英语:Connectionless Broadband Data Service,缩写CBDS)。[1]:510

SMDS规范由Bellcore制定[2][3][4],其基于IEEE 802.6英语IEEE 802.6 城域网(MAN)标准,由Bellcore实现,并使用小区中继英语Cell relay传输,分布式队列双总线英语Distributed-queue dual-bus network第二层交换仲裁器[来源请求],以及标准的同步光网络(SONET)[5]G.703英语G.703作为接入接口。

它是一种提供1.544 Mbit/s(T1或DS1)至45 Mbit/s(T3或DS3)速率数据传输的交换服务。SMDS由Bellcore开发为一个临时服务,直到Asynchronous Transfer Mode成熟。[1]:510SMDS值得注意的是,它首先引入了53字节的单元和单元切换方法,以及将53字节单元插入G.703和SONET的方法。[1]:214在1990年代中期,SMDS被取代,主要的继任者是帧中继(Frame Relay)。

参考资料

  1. ^ 1.0 1.1 1.2 McDysan, David E.; Darren L. Spohn. ATM Theory and Applications. Montreal: McGraw-Hill. 1999. ISBN 0-07-045346-2. 
  2. ^ TR-TSV-000772页面存档备份,存于互联网档案馆Generic System Requirements in Support of Switched Multi-Megabit Data Service, Telcordia.
  3. ^ TR-TSV-000773页面存档备份,存于互联网档案馆Local Access System Generic Requirements, Objectives, and Interfaces in Support of Switched Multi-Megabit Data Service, Telcordia.
  4. ^ TR-TSV-000774页面存档备份,存于互联网档案馆Switched Multi-Megabit Data Service (SMDS) Operations Technology Network Element Generic Requirements, Telcordia.
  5. ^ GR-253页面存档备份,存于互联网档案馆SONET Transport Systems: Common Generic Criteria, Telcordia.

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交换式多兆位数据服务
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