3-68
Performance Tests
STM-0/STS-1 Transmitter Output Waveshape
NOTE It may be necessary to select softkey and /
or to visibly fit the waveform to the mask by adjusting the
Oscilloscope vertical gain/position and horizontal delay 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 nominally 530 mV.
Negative Pulse
8 On the Oscilloscope, use the following key sequence to access the
inverted mask.
a/ SHIFT (Blue Key) DISK
b/ softkey
c/ Use ENTRY/MEASURE control to highlight INV_MASK
d/ softkey
Load the Telecom Mask
9 On the Oscilloscope, use the following key sequence to select and load
the required Telecom Mask:
a/ SHIFT (Blue Key) APPLICATION.
b/ softkey.
c/ Use ENTRY/MEASURE control to select STS1_93 in the
highlighted MSK FILES window.
d/ softkey.
Compare Pulse with Mask
10 On the Oscilloscope, use the following key sequence to compare the
pulse with the mask:
a/ RECALL 8
b/ DEFINE MEAS
c/ softkey
d/ softkey
e/ softkey
f/ softkey
g/ RUN
11 The Oscilloscope will automatically display and compare an isolated
positivepulsewith the masklimits.A PASSmessage should appearon
the Oscilloscope
MASK MASK AUTO
MASK ALIGN
DIRECTORY
CHANGE DIRECTORY
TELECOM MASK/MASK
LOAD SETUP 8 M1M2
COMPARE
TEST ON
M1M2
AFTER FAIL CONTINUE
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