3-19
Performance Tests
PDH Transmitter Output (UKK, [USB], UKJ, [USA]
139.264 Mb/s Unbalanced Output
35. Press and set up the
display as shown opposite.
36. Press on the
oscilloscope.
37. Select the BIN1 140 Mb G.703 mask
on the oscilloscope and store it on the
display.
38. Adjust the Oscilloscope Delay to
position the positive peak pulse amplitude
at mid-pulse-width point in the centre of
the screen.
39. Measure the peak pulse amplitude at mid-pulse-width using the Oscilloscope and
verify that this is between 0.900V and 1.100V.
40. Press SHIFT on the oscilloscope to automatically align the pulse
to the mask. Verify that the pulse falls within the mask as shown in Figure 3-12.
NOTE If your oscilloscope does not have the Mask feature, obtain a printout of the displayed
pulse. Place the mask, shown in Figure 3-11, over the pulse and ensure that the pulse
falls within the mask. (A transparent copy of the mask should be used).
Figure 3-11 140 Mb/s Pulse Mask All 1’s
TRANSMIT
AUTOSCALE
AUTOSCALE
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