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Performance Tests
External 2Mb/s Mux/Demux (Options UKJ, [USA], UKN, [USA])
12. Adjust the Oscilloscope Timebase and Delay to position the positive peak pulse
amplitude at mid-pulse-width point in the centre of the screen.
13. Measure the peak pulse amplitude at mid-pulse-width using the Oscilloscope and
verify that this is between 2.133V and 2.607V.
14. Select the 2Mb G.703 mask on the oscilloscope and store it on the display.
15. 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 3-25.
Figure 3-25 2 Mb/s Pulse Mask
NOTE If your oscilloscope does not have the Mask feature, obtain a printout of the displayed
pulse. Place the mask, shown in Figure 3-25, over the pulse and ensure that the pulse
falls within the mask. (A transparent copy of the mask should be used).
16. Press on the oscilloscope to display the full waveform.
17. Use the following sequence to display the isolated negative pulse.
Select menu.
Set trigger level to middle of negative pulse.
Set trigger to pattern.
Set sequence to H X X.
AUTOSCALE
AUTOSCALE
TRIG
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