The Interlaken Retransmit Extension Protocol Definition, Revision 1.2, June 28, 2012 defines a sequence number multiplier. The sequence number is contained in the Multiple-Use bits of a Burst Control Word. The multiplier causes the same sequence number to be transmitted for multiple bursts thus implying a sub-sequence number.
The Channel Extension bits can also be contained in the Multiple-Use bits of a Burst Control Word. This can limit the maximum number of sequence numbers. The multiplier extends the number of bursts in a sequence. For example, if the channel extension is set to 256 channels and the sequence multiplier to x32, the maximum sequence length is 8192 bursts. However, if the channel extension is set to 2048, the maximum sequence length is 1024 bursts.
The Integrated Interlaken IP core supports sequence number multipliers of 1, 2, 4, 8, 16, and 32.