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Performance Tests
SDH/SONET Frequency Offsets
SDH/SONET Frequency Offsets
Specifications
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 and is directly related to the SDH/SONET output rate. An
external 10 MHz reference from a Signal Generator is used to clock the
HP 37718A/19A and also provides a timebase reference for the
Frequency counter. The counter measures the Clock Trigger frequency to
check the offset accuracy and range.
Equipment Required
Procedure
1 Recall the HP 37718A/19A DEFAULT SETTINGS as shown on page 3-
4. Set the Transmitter Output to SDH/SONET.
2 Select CLOCK SYNC [10MHz REF] ON THE HP 37718A/19A
display.
3 Connect the HP8657A to the HP 37718A/19A Unbalanced 75Ω 2M
REF IN port on the Clock Module.
4 Set the Signal Generator frequency to 10.000MHz and amplitude to
+10dBm.
5 Check the Clock Loss Alarm Led is not lit.
Range ±999 ppm
Resolution 0.1 ppm
Accuracy 0.02 ppm
Signal Generator : HP 8657A
Frequency Counter : HP 5335A Opt 010
T Connector : HP 1250-0781
TRANSMIT
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