3-65
Performance Tests
SDH/SONET Frequency Offsets
6 Connect the Signal Generator, Timebase OUT port (rear panel), to the
counter Timebase IN port (rear panel).
7 Check the Counter EXT TIME BASE flag is illuminated on the front
panel.
8 Connect the HP 37718A/19A Multirate Analyzer module CLOCK
TRIGGER port to the Frequency Counter, set input termination to
50Ω.
9 Adjust the Frequency Counter Trigger Level to obtain a stable
reading.
10 The reading should be between 51.839999 - 51.840001MHz. If not
check setup and ensure the Counter is locked to the Signal Generator.
11 Set the HP 37718A/19A frequency offset to the settings given in Table
3-2 and verify the frequency at each step is within the Min/Max limits.
12 Disconnect all the test equipment.
Table 3-2 SDH/SONET Offset
Offset
(ppm)
Min Expected
Frequency
Max Expected
Frequency
-999ppm 51788210.8 Hz 51788212.9 Hz
-100ppm 51834814.9 Hz 51834817.1 Hz
-66.6ppm 51836546.4 Hz 51836548.5 Hz
+33.3ppm 51841725.2 Hz 51841727.3 Hz
+100ppm 51845182.9 Hz 51845185.1 Hz
+999ppm 51891787.1 Hz 51891789.2 Hz
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