{
  "slug": "serial-ata-tunneled-protocol",
  "term": "Serial ATA Tunneled Protocol",
  "aliases": [
    "STP",
    "Serial ATA Tunneling Protocol"
  ],
  "definition": "The SAS protocol that carries SATA communication through a SAS domain to an attached SATA device.",
  "note": "An expander-connected SATA path uses STP through the SAS portion and native SATA on the final device link. SATA frames and flow-control rules remain relevant at that boundary. [t10-overview]\n\nSTP is not SCSI-to-ATA command translation. SAT defines that mapping, and software may perform it separately from transport. A SATA device appearing through a SCSI software interface does not establish that the device itself speaks SSP. [sat] [libata]",
  "related": [
    "sas",
    "sata",
    "sas-expander",
    "serial-scsi-protocol",
    "serial-management-protocol"
  ],
  "citations": [
    {
      "id": "spl",
      "title": "SNIA dictionary: SAS Protocol Layer",
      "url": "https://www.snia.org/education/online-dictionary/term/sas-protocol-layer",
      "accessed": "2026-10-17"
    },
    {
      "id": "t10-overview",
      "title": "T10/02-158r1: SAS technical overview, slides 14, 87, 89 and 93-97 (2002)",
      "url": "https://www.t10.org/ftp/t10/document.02/02-158r1.pdf",
      "accessed": "2026-10-17"
    },
    {
      "id": "sat",
      "title": "T10 working drafts: SCSI / ATA Translation scope",
      "url": "https://www.t10.org/drafts.htm",
      "accessed": "2026-10-17"
    },
    {
      "id": "libata",
      "title": "Linux kernel: libATA SCSI-to-ATA translation",
      "url": "https://www.kernel.org/doc/html/latest/driver-api/libata.html",
      "accessed": "2026-10-17"
    }
  ],
  "provenance": [
    "Canonical protocol expansion follows the SNIA dictionary. [spl] The T10 presentation is from 2002; this entry does not specify current expander limits."
  ],
  "status": "shipping",
  "advantages": [],
  "limitations": [],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-10-17"
}