3-58
Performance Tests
SDH/SONET Transmitter Clock Accuracy
SDH/SONET Transmitter Clock Accuracy
Specification
Description
The test uses a Frequency Counter connected to the Multirate Analyzer
module Clock Trigger output port. This output is derived from the Clock
module internal 10MHz clock oscillator providing a 51.84 MHz that is
directly related to all SDH/SONET output rates.
Equipment Required
Procedure
1 Recall the HP 37718A/19A DEFAULT SETTINGS as shown on page 3-
4.
2 Set the Transmitter Output to SDH/SONET.
3 Connect the HP 37718A/19A Multirate Analyzer module CLOCK
TRIGGER port to the Frequency Counter Input A, set the input
termination to 50Ω.
4 Adjustthe Frequency Counter Trigger Level to obtain astable reading
and ensure that the Frequency Counter reads between 51.839670
MHz and 51.840230 MHz.
5 Disconnect all the test equipment.
Bit Rate Accuracy
51.84 Mb/s
4.5 ppm
Frequency Counter : HP 5335A Option 010
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