Tektronix OI1125, Instruction Manual

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Performance Verification
OI1125 E/O Transmitter Instruction Manual
37
BERT.
Set the BERT settings as follows:
2. Set the BERT bit rate to 2.48832 Gb/s (SONET OC-48 rate):
a. In the CLK ADJ section, select Memory # to assign a number to the bit
rate. This is the memory number that you will use to recall this bit rate.
Suggestion: Use 1 for 2.48832, 2 for 9.95328, and 3 for 12.50000 Gb/s.
NOTE
. Store the bit rate settings so that you can recall them when completing
other tables in the PV procedure.
b. Press Edit.
c. Use the dial or arrow keys to input the bit rate. The left and right arrow
keys select the digit to be changed. An annunciation dot appears to the
left of the digit to be changed. The up and down arrow keys select the
value of the digit selected.
d. When you have the correct bit rate entered (2.48832 Gb/s), press Store
and Edit to assign this bit rate to the memory number that you selected
in step a.
3. Repeat steps 2a through 2d for 9.95328 Gb/s and 12.50000 Gb/s bit rates.
4. Recall the 2.48832 Gb/s bit rate.
5. Set the word pattern to 16 bit, 0-0-0-0-0-0-0-0-1-1-1-1-1-1-1-1:
a. In the Pattern Mode section, press the Word button.
b. Using the arrow keys, select Patt Data.
c. In the Pattern section, press Edit.
d. In the Pattern Length section, set the word length to 16.
e. Set bits 1-8 to 0, and set bits 9-16 to 1.
6. Disable the crossing point adjust.
7. Set the trigger output to 1/32 clock.
8. Set the output mode to AC.
9. Turn the data output on, and set the data amplitude to 1.5 V
p–p
.