EXFO FTB-8500 Series for FTB-500 - Manual (Page 34)

Physical Interfaces and LEDs
20 FTB-8500 Series and FTB-8120NGE/8130NGE
FTB-8525 and FTB-8535 Models

Carefully connect optical fiber cables to the SFP’s IN and OUT ports. To
ensure good signal quality, make sure that the optical fiber connector is
fully inserted into the optical connector port.

LEDs for Optical Ports
LED Status Description
LASER
(Red) On An optical signal is generated
Off No optical signal is generated
RX LED used
for Ethernet
and Fibre
Channel
Link/Activity
status
On Link up
Off Link down
Flashing TX/RX activity