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Transmission Sequence Number (TSN)

Definition - What does Transmission Sequence Number (TSN) mean?

A transmission sequence number (TSN) is a 32-bit internal numerical sequence number assigned to data fragments by Stream Control Transmission Protocol (SCTP). TSNs are independent of other stream sequence level numbers and acknowledged by receiving end points, even during sequencing gaps. Fragments are then reassembled before they are passed to SCTP clients, which ensure reliable sequenced stream delivery.

Techopedia explains Transmission Sequence Number (TSN)

The following are TSN attributes:

  • Ensure that lower layer packets conform to the maximum transmission unit path.
  • Facilitate endpoint acknowledgment.
  • Provide duplicate delivery detection.
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