3-225
Performance Tests
ETSI/ANSI Transmitter Output Level and Waveshape (Option 110)
2.048 Mb/s Negative Pulse
1. Select CHAN on the oscilloscope and set OFFSET to -800mV.
2. Select TRIG on the oscilloscope and set to PATTERN H X X X.
3. Select TIMEBASE on the Oscilloscope and set DELAY to 126 nS. Adjust the
delay manually until the negative pulse is centred on the oscilloscope display.
4. If using the HP 54503A oscilloscope, use the following key sequence to select
and store the correct Telecom Mask.
a. WFORM SAVE key.
b. MASK CCITT G703 DS1E 2.0 Mb softkey.
c. STORE to M1 + M2.
e. STORE INVERSE.
5. Compare the isolated negative pulse from the HP 37717C with the limits in the
selected Telecom Mask.
6. Ensure the waveform fits the mask.
NOTE It may be necessary to visibly check the waveform fits the mask and manually adjust
amplitude and offset parameters on the oscilloscope to obtain a PASS on the Mask.
7. Measure the peak pulse amplitude at the mid pulse-width using the oscilloscope
and verify that this is between 2.133V and 2.607V.
DSX-3 Positive Pulse
1. Recall the HP 37717C Default Settings as shown on 3-2.
2. Select the HP 37717C TRANSMIT
page, select PHYSICAL LAYER and set
as follows;
3. Connect the 110 Transmit Module 75
ohms Unbalanced Output to the Oscilloscope via the 75/50 ohm converter.
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