Finisar Surveyor - Manual (Page 177)

8-9
Transmit Specification
Specifying Transmit Data
8
Table 8-5 shows the buttons that are available from within the packet editor:
:
Editing in Decode View
Editing in decode view allows you to edit packets without remembering offsets.
Click on a field and a dialog box pops up which shows the current value for the field
and asks for a new value. The dialog boxes for each field is slightly different. Most
dialog boxes display and allow you enter values in hexadecimal or decimal. Some
contain a
Use little-endian bit order check box if bit order swapping is required.
Changes made in decode view are automatically reflected in hex view.
Editing in Hex View
Edits are made in hex view by placing the cursor at a location and overwriting the
current values. You can also paste (Ctrl + V) the contents of the paste buffer into
a location. Values are always overwritten starting at the current cursor location in
hex view so offsets remain correct.
Press the Decode button to display edits made in hex view in the decode view. Note
that changes to the decode view are not automatic. This provides the option of
creating error packets that can’t be decoded properly.
Note
NDIS modules cannot transmit without a valid CRC.
Changing Fields Directly in the Dialog Box
The values of various fields in the currently selected stream are shown in the
Transmit Specification fields below the
Defined Stream list box. You can change
the stream data by editing these fields directly.
Table 8-5. Packet Editor Buttons
Packet Editor Button Editing Function
Compute CRC Inserts the correct CRC error check value for the frame. You can use
this option to create frames with or without correct CRC error check
values.
Decode Takes the values entered in the Hex View window of the packet edi-
tor, decodes the packet, and displays the resulting decode in the
Decode View window.
Undo Undo the last editing action. Only one level of undo is supported.
OK Save edits.
Cancel Leave the editor without saving changes.