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sequence count field (SC)

The sequence number field (SC) is in the protocol data unit (PDU) of the segmentation and reunification sublayer (SAR) depending on the type of ATM Adaption Layer (AAL). For AAL type 1 it is a 3 bits long data field, for AAL type 3/4 it is a 4 bits long data field, which is used for sequence integrity control. Each SAR PDU is assigned a consecutive sequence number, modulo 8 in AAL-1 and modulo 16 in AAL-3/4.

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Englisch: sequence count field - SC
Updated at: 03.03.2008
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