Synchronous Transport Signal

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Synchronous Transport Signal (STS) refers to the electrical component of a SONET network, prior to the signal being converted to light for transmission over optical fiber. SONET defines several transport rates, including:

  • STS-1: 51.84 Mbps (seldom deployed, there is an electrical STS-1 interface instead)
  • STS-3: 155.52 Mbps
  • STS-12: 622.08 Mbps
  • STS-48: 2.48832 Gbps
  • STS-192: 9.95328 Gbps
  • STS-768: 39.81312 Gbps

STS-1 payloads can also be concatenated, resulting in an unchannelized higher-speed payload typically used for connection between packet switching devices (e.g., ATM switches, IP routers, etc.). Concatenated circuits operate at the same basic transmission rate as non-concatenated circuits, but they have a slightly higher payload capacity because they have less overhead.

See Also


<mp3></mp3> | Optical Carrier vs. Synchronous Transport Signal (STS)