Agilent Technologies J3972A User's Guide Page 375

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Protocol Analyzer
Building a Filter
374 5967–9446
The pattern filter component window contains the following items.
Pattern Expression Specifies the logical connection for the pattern/mask elements. Valid
characters in this field are integers 1 through 8, left and right
parentheses (), and these logical operators: & (AND), | (OR), and ! (NOT).
You can configure up to eight different pattern/mask elements, then
combine them with operators to create the pattern filter component.
Edit Indicates which of the eight available elements is displayed for editing
in the Pattern and Mask boxes.
Pattern Offset Specifies where in the packet to begin the comparison. Specify an offset
into the packet in bytes (decimal); for example, to begin comparing with
the fifth byte in the packet, specify an offset of 4.
Packets that are not as long as the offset specified will always fail the
pattern match; for example, a 64-byte packet will never pass a pattern
match filter with an offset of 72.
Pattern Value Indicates the pattern to compare to the packet; you may specify up to 32
bytes of Hex or ASCII data per pattern element. Specify hexadecimal
patterns as two-character bytes; for example, use 0F, not F.
Pattern Operator Indicates the comparison to use when matching the pattern to the
packet; choose equal to (=) or not equal to (!=).
Mask Defines a mask. The mask is applied to the packet at the pattern offset,
then the result is compared to the pattern element. The mask is
Enabled or Disabled. You must enable the mask before you can
specify a mask value.
Figure 79 on page 375 shows an example pattern that uses a mask.
Mask Value Specifies the mask’s value as a string of Hex or ASCII bytes. The
length of the mask value must equal the length of the pattern value
(otherwise, the value is padded with zeros at left).
Mask Operator Indicates that the mask will be applied to the packet using a logical
AND.
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