Frequency Measurement - HP 37717C Operating Manual

PDH / DSn Testing With The HP 37717C

Frequency Measurement

Frequency Measurement

Options Required Structured PDH UKJ (USA) or UKN (USE), or Unstructured
PDH UKK (USB)
Alternatively for PDH / DSn with ATM payloads Option UKZ.
Application
The clock frequency and the amount of offset from the ITU standard rate can be
measured to give an indication of probability of errors. The measurement can be
made in out of service or monitor mode and is generally of short duration.
Default (Known State) Settings
It can be advisable to set the HP 37717C to a known state prior to setting up to make
a measurement. This clears all previous settings and provides a clearly defined
instrument state. For a list of Default Settings and the procedure for accessing them
see Stored Settings.
Test Setup Procedure (Frequency Measurement)
If measuring frequency at PDH rates one of the following options is required.
• UKJ (USA), UKN (USE), UKK (USB) or UKL - Modules with PDH capability.
• UKZ - Module with PDH / DSn capability
If measuring frequency at SDH rates the following options must be fitted:
• US1 (US5) or A1T (A1U) - SDH Module (STM-1 electrical)
• UH1 or UH2 or URU (STM-1 or STM-4 optical)
If measuring on live traffic the measurement is interfaced at the line terminal
equipment Monitor point.
The HP 37717C is used in a receive only mode to measure the PDH / DSn
frequency. The PDH / DSn frequency is measured and compared with the internal
ITU standard frequency selected
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