3-25
Performance Tests
Multiple PDH Transmitter Outputs (Options UHC, [US6])
14. Check that the pulse on Channel 2 is 8 bits delayed with respect to the pulse on
Channel 1.
15. Disconnect the SIGNAL OUT 3 port from the oscilloscope and connect the
SIGNAL OUT 4 port to the oscilloscope Channel 2.
16. Check that the pulse on Channel 2 is 12 bits delayed with respect to the pulse on
Channel 1.
2.048 Mb/s Output Pulse
17. Connect the PDH SIGNAL OUT 2 port to the Oscilloscope Channel 1. Set the
Oscilloscope termination to 1MΩ.
18. Press and set up the
display as shown opposite.
19. Press on the
oscilloscope.
20. Adjust the Oscilloscope Timebase and
Delay to position the positive peak pulse
amplitude at mid-pulse-width point in the
centre of the screen.
21. Measure the peak pulse amplitude at
mid-pulse-width using the Oscilloscope
and verify that this is between 2.133V and 2.607V.
22. Select the 2Mb/s G703 Mask on the oscilloscope and store it on the Display.
23. 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 3-16.
NOTE If your oscilloscope does not have the Mask feature, obtain a printout of the displayed
pulse. Place the mask shown in Figure 3-16 over the pulse and ensure that the pulse
falls within the mask (a transparent copy of the mask should be used).
TRANSMIT
AUTOSCALE
AUTOSCALE
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