EXFO FTB-8500 Series for FTB-500 - Manual (Page 521)

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Ethernet and Fibre Channel Application 507
Field Match Configuration
Mask: Allows masking the defined filter value. A bit mask of 1 indicates that
the corresponding bit in the value is compared for the match. A bit mask of
0 indicates that the corresponding bit in the value is ignored.
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For binary values, enter the mask value in binary format.
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For decimal values, enter the mask value in hexadecimal format.
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For IP address field, enter the mask in decimal format.
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For MAC address, enter the mask value in hexadecimal format.
Oper.: Allows the selection the logical operator (AND or OR) between two
operands.