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sequence number (SN)

In ATM, the Sequence Number (SN) is a 4 octet long data field in theResource Management( RM) cell

. It is

Recommendation I.371 from the International Telecommunication Union (ITU-T) for cell

sequencing.The Sequence Number is not used by the ATM Forum forAvailable Bit Rate

(ABR). An ATM switch keeps this field reserved or sets it in accordance with the ITU recommendation.A SN cell is sent out periodically on all lines

ofan ATM Inverse Multiplexing

(AIMUX) and indicates how many cells have been sent in the time

between the last SN cell and the one currently being transmitted. The SN cell is used to restore the sequence of the payload cells at the receiving location. In the Realtime Transport Protocol (RTP), the Sequence Number (SN) is a 1-byte data field.

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Englisch: sequence number - SN
Updated at: 12.11.2020
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