EXFO FTB-8500 Series for FTB-200 - Manual (Page 164)

Port Tabs
150 FTB-8500 Series and FTB-8120NGE/8130NGE
Optical RX
Optical RX
Press Main, Test, Port, and Optical RX.
Signal Analysis

Power Level (dBm): Indicates the power level of the input signal in
dBm.

Input Presence: Indicates if there is a valid signal at the input port
(green) or not (grey).
Alarm Analysis

LOS (Loss Of Signal): A LOS indicates that there is no input signal.

Frequency: The frequency alarm indicates that the received signal rate
meets the standard rate specifications (green) or not (red).
Interface Standard Rate Specification
100 Mbps FTB-8510B: 0.125 Gbps ± 12.5 Kbps (±100 ppm)
FTB-8120NGE/FTB-8130NGE/FTB-8525/FTB-8525:
0.125 Gbps ± 15 Kbps (±120 ppm)
1000 Mbps FTB-8510B: 1.25 Gbps ± 125 Kbps (±100 ppm)
FTB-8120NGE/FTB-8130NGE/FTB-8525/FTB-8525:
1.25 Gbps ± 150 Kbps (±120 ppm)