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Note 3: A DS3 is delivered native on a copper trunk. DS3 may be converted to an optical fiber run when needing longer distances between termination points. When a DS3 is delivered over fiber it is still an analog type trunk connection at the termination points. When delivering data over an OC3 or greater SONET is used. A DS3 transported over SONET is encapsulated in a STS-1 SONET channel. An OC-3 SONET link contains three STS-1s, and therefore may carry three DS3s. Likewise, OC-12, OC-48, and OC-192 may carry 12, 48, and 192 DS3s respectively.[citation needed]

[edit] See also

[edit] References

  1. ^ ITU-T recommendation G.703
  2. ^ ITU-T Recommendation G.7043
  3. ^ E1 Environment, RAD data communications University Tutorials
  4. ^ Signaling System No. 7 (SS7/C7): Protocol, Architecture, and Services, Lee Dryburgh, Jeff Hewett, 2004

[edit] External links

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