EXFO FTB-8500 Series for FTB-500 - Manual (Page 431)

Tools Tabs
Ethernet and Fibre Channel Application 417
Traffic Scan
Link Rate (Mbps)
Indicates the network link rate based on the received frames with a valid
FCS regardless if the frame matches or not the traffic flows and filters, and
regardless if the traffic flow was ignored due to the limit reached (see Limit
Reached on page 417). The rate is expressed either in Line Utilization or
Ethernet Bandwidth (see Rate Layer).
Rate Layer
Allows the selection of the rate unit used for Link Rate and Rate statistics.

Line Utilization is used to express the real line rate including the
Preamble, SFD, and IFG.

Ethernet BW (Bandwidth) is used to express the Ethernet bandwidth
rate excluding the Preamble, SFD, and IFG.
Discovered
Indicates the number of different traffic flows monitored based on the scan
criteria and filters.
Limit Reached
Up to 128 different traffic flows can be monitored, the Limit Reached LED
turns on when the limit is reached.