EXFO FTB-800 Series for FTB-1 - Manual (Page 66)

Test Setup - Test Applications
56 FTB-700G/800 Series
Smart Loopback
Smart Loopback
Allows transmitting back the received Ethernet stream of data while
interchanging the source and destination MAC addresses, IP addresses,
and/or UDP/TCP ports. However in Transparent (Pseudo-Physical) mode
the Smart Loopback operates as a physical loopback by transmitting all
received frames unaltered and without discrimination.
The Smart Loopback test can be created locally (refer to Ethernet Test
Applications on page 69) or remotely using an EXFO unit (refer to Discover
Remote Button on page 464) or a Third-Party device (see Third-Party
Remote Loopback on page 57).

Typical Smart Loopback test application:

Supported Interfaces/Rates: 10M to 10G LAN/WAN.
Network
under test
Testing Unit Smart Loopback Unit
FTB-700G/800 Series FTB-700G/800 Series