Synchronous Digital Hierarchy
  • Its abbreviation is SDH. An ITU standard for transmitting digital data over optical networks, at rates ranging from 155.52 Mbps, with higher speeds based on multiples of this number, such as 2.48832 or 39.81312 Gbps. The compatibility between SDH and SONET enables the interconnection of digital networks internationally.
  • acronym SDH

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