EXFO FTB-800 Series for FTB-1 - Manual (Page 482)

Test Control
472 FTB-700G/800 Series
Lpbk Tool Button (Loopback Tool)

Loopback Mode determines at which layer the address/port swapping
is limited.

Ethernet swaps the MAC addresses of received packets having
their Destination MAC address matching the MAC address of the
loopback port.

Ethernet (All Unicast) swaps the MAC addresses of received
packets having Unicast Destination MAC address.

IP, for Ethernet Layer 3 and 4, swaps the MAC and IP addresses of
received packets having their Destination IP address matching the
IP address of the loopback port. For Ethernet Layer 2, swaps the
MAC addresses for packets having their Destination MAC address
matching the MAC address of the loopback port.

UDP/TCP (default), for Ethernet Layer 4, swaps the UDP or TCP
ports and the MAC and IP addresses of received packets having
their Destination IP address matching the IP address of the
loopback port. For Ethernet Layer 3, swaps the MAC and IP
addresses for packets having their Destination IP address
matching the IP address of the loopback port. For Ethernet Layer 2,
swaps the MAC addresses for packets having their Destination
MAC address matching the MAC address of the loopback port.

Traffic

Line Utilization (%) indicates the current percentage of the
transmitting/receiving line rate utilization.

Ethernet BW (Mbit/s) indicates the current transmitting/receiving
data rate expressed in Mbit/s.

Frame Rate (frame/s) indicates the current transmitted/received
number of frames (including bad frames, Broadcast frames and
Multicast frames) in frame per second.

Frame Count indicates the total number of transmitted/received
valid and invalid frames.