EXFO FTB-800 Series for FTB-1 - Manual (Page 68)

Test Setup - Test Applications
58 FTB-700G/800 Series
Through Mode
Through Mode
The Through Mode test application allows traffic to pass through the
FTB-700G/800 Series unit using either two electrical or optical ports for
in-service troubleshooting of live traffic between the carrier/service
provider network and the customer’s network.

Typical Through Mode test application:

Supported Interfaces/Rates: 10M to 1G.
Testing Unit
in Through Mode
Network Ethernet Network Ethernet
FTB-700G/800 Series