Hop sequences

Mathematical functions for deriving hop sets are part of the FH PHY specification and are found in clause 14.6.8 of the 802.11 specification. As an example, hopping sequence 1 for North America and most of Europe begins with the sequence {3, 26, 65, 11, 46, 19, 74, 50, 22, ...}. 802.11 further divides hopping sequences into nonoverlapping sets, and any two members of a set are orthogonal hopping sequences. In Europe and North America, each set contains 26 members. Regulatory authorities in other areas have restricted the number of hopped channels, and therefore each set has a smaller number of members. Table 10-2 has details.

Table 10-2. Size of hop sets in each regulatory domain

Regulatory domain

Hop set size



Canada (IC)


Europe (excluding France and Spain) (ETSI)






Japan (MKK)


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