EXFO PSO-200 Optical Modulation Analyzer - Manual (Page 111)

Bit Pattern Analysis and the Gearbox
Optical Modulation Analyzer 103
Using PRBS or User-Defined Bit Patterns with the Gearbox
7. For each stream listed, perform the following:
7a. Click to open the Bit Pattern Editor window.
7b. You can import an existing bit pattern file (plain text with
hexadecimal values), then edit values as needed, or you can
simply enter the values corresponding to the bit pattern.
Click Import, select the file and click Open. The imported pattern
length is displayed, to save you from counting bytes. You can also
click Clear to discard the currently displayed values.
7c. Enter a Pattern length. The value must be smaller or equal to the
number of bits in the hexadecimal pattern displayed. The pattern
might be truncated to match this length.
7d. Click OK to exit the Bit Pattern Editor.
7e. On the Gearbox tab, enter an Offset value (in bits, from bit 0) if
you want the sequence to start at the n
th
bit/position, and select
whether each bit in the stream is inverted or not (0 becomes 1
and vice-versa).
Note: When working with delays, the branch that has no delay ends up with the
highest offset.
8. Click Apply to confirm your settings, or OK to also close the window.
Byte count