3-10
Performance Tests
PDH Transmitter Output (UKK, [USB], UKJ, [USA]
Description
This test verifies that the PDH transmitter output level and pulse shape meet
required ITU specifications for all rates. The SIGNAL OUT Port is connected to a
Digitizing Oscilloscope and the waveform is checked for required amplitude and
duty cycle at the nominal mid-points. The waveform shape is also checked by
comparison with the special ITU masks. These may be obtained from the
oscilloscope memory (if this feature is fitted) or can be traced from the attached
figures and compared with a printout of the oscilloscope waveform.
NOTE A Balanced to unbalanced Converter is required to test the Balanced output port. The
3V peak at the output is reduced to 2.37V peak on the oscilloscope by this device.
The oscilloscope must be terminated in 75Ω for both balanced and unbalanced
outputs.
Equipment Required
Procedure
704 kb/s Unbalanced Output
1. Recall the HP 37717C DEFAULT SETTINGS as shown on Page 3-2.
2. Connect the Unbalanced 75Ω SIGNAL OUT port to the Oscilloscope Input 1 via
a 75Ω termination and "T" connector. Set the oscilloscope termination to 1MΩ.
NOTE Steps 3 to 10 are only valid for Option UKK, [USB].
Oscilloscope : HP 54503A
120W/75W Balanced to
Unbalanced Converter
: HP 15508C
ThinkJet Printer : HP 2225A
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