Synchronous Digital Hierarchy
E719378
Synchronous Digital Hierarchy (SDH) is an international standard for high-speed fiber-optic telecommunications that provides a flexible, synchronous framework for transporting digital signals in public and private networks.
Statements (53)
| Predicate | Object |
|---|---|
| instanceOf |
digital transmission hierarchy
ⓘ
fiber-optic transport technology ⓘ telecommunications standard ⓘ |
| abbreviation | SDH NERFINISHED ⓘ |
| basedOn | synchronous multiplexing ⓘ |
| comparedWith | SONET NERFINISHED ⓘ |
| compatibility | interoperable with SONET at interface level ⓘ |
| designedFor |
high-speed fiber-optic telecommunications
ⓘ
private telecommunications networks ⓘ public telecommunications networks ⓘ |
| frameDuration | 125 microseconds ⓘ |
| frameStructure | 9-row by 270-column STM-1 frame ⓘ |
| geographicalUse | primarily outside North America ⓘ |
| hasBasicRate | STM-1 NERFINISHED ⓘ |
| hasBasicRateBitrate | 155.52 Mbit/s ⓘ |
| hasHigherOrderRate |
STM-16
NERFINISHED
ⓘ
STM-256 NERFINISHED ⓘ STM-4 ⓘ STM-64 ⓘ |
| hasOverheadType |
line overhead
ⓘ
path overhead ⓘ section overhead ⓘ |
| hasStandardSeries |
ITU-T G.707
NERFINISHED
ⓘ
ITU-T G.708 NERFINISHED ⓘ ITU-T G.709 NERFINISHED ⓘ ITU-T G.783 NERFINISHED ⓘ ITU-T G.784 NERFINISHED ⓘ ITU-T G.803 NERFINISHED ⓘ |
| introducedIn | late 1980s ⓘ |
| keyFeature |
flexible multiplexing of digital signals
ⓘ
network management capabilities ⓘ standardized optical carrier rates ⓘ support for protection and restoration mechanisms ⓘ synchronous transmission framework ⓘ |
| relatedTo | Synchronous Optical Network NERFINISHED ⓘ |
| replaced | Plesiochronous Digital Hierarchy NERFINISHED ⓘ |
| standardizedBy | ITU-T NERFINISHED ⓘ |
| supportsProtectionScheme |
1+1 protection
ⓘ
1:N protection ⓘ ring protection ⓘ |
| supportsSignalType |
ATM traffic
ⓘ
IP traffic over SDH ⓘ PDH tributaries ⓘ |
| supportsTopology |
mesh topology
ⓘ
point-to-point topology ⓘ ring topology ⓘ |
| synchronizationSource | primary reference clock ⓘ |
| usedIn |
backbone networks
ⓘ
long-haul transmission systems ⓘ metropolitan area networks ⓘ |
| usesMultiplexingStructure |
Administrative Unit
ⓘ
Tributary Unit ⓘ Virtual Container ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.