EXFO FTB-8500 Series for FTB-500 - Manual (Page 30)

Physical Interfaces and LEDs
16 FTB-8500 Series and FTB-8120NGE/8130NGE
FTB-8510G Model
Carefully connect optical fiber cables to the XFP’s IN and OUT ports. To
ensure good signal quality, make sure that the optical fibre connector is
fully inserted into the optical connector port.
Note: Do not replace an XFP while the test is running to avoid distorting results.
First stop the test, replace the XFP, and then restart the test.
Note: Only use EXFO supported XFPs. Using non-supported XFPs can affect the
performance and accuracy of the optical port.

LEDs
LASER LED: The red LASER LED is on when the FTB-8500 Series and
FTB-8120NGE/8130NGE is emitting an optical laser signal.
LINK/ACT LED: The LINK/ACT LED is on when the link is up, off when
the link is down, and flashing when frames are transmitted and/or
received.
Wavelength Description Part Number
850 nm Short-wave optics SR for LAN or SW for WAN FTB-85900
1310 nm Long-wave optics LR for LAN or LW for WAN FTB-85901
1550 nm Long-wave optics ER for LAN or EW for WAN FTB-85902
C
AUTION
To prevent exceeding the maximum input power level, please use
an attenuator when a loopback configuration is used.