EXFO FTB-8510B Guia Del Usuario página 795

Port Tabs
Port RX (Electrical Interfaces)
Signal Analysis
Power Level: Indicates the power level of the input signal in dBm for
E1, E2, E3, E4, STS-1e/STM-0e, and STS-3e/STM-1e. In order to get
accurate power level reading (within specified tolerance), an all-ones
signal must be present at the interface under test otherwise this value
only provide indicative reading.
Level (Vref = 6.00 Vpp) / Level (Vref = 1.21 Vpp): Presents the
received signal level in dBdsx for respectively DS1 and DS3. The
dBdsx values are calculated with the following expressions:
For DS1: 20 log (Vpp measured / 6.00)
For DS3: 20 log (Vpp measured / 1.21)
Amplitude: Indicates the amplitude of the input signal in Vpp.
Input Presence: Indicates if there is a signal at the input port (green) or
not (gray).
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SONET/SDH Application