EXFO FTB-800 Series for FTB-1 - Manual (Page 547)

Glossary
NetBlazer 537
10G Ethernet Client
The following figure presents a typical test application.
The Ethernet layer provides the equivalent functionality of the BERT
Framed Layer 2 Test application supported on EXFO’s Datacom product
family with the particularity that there is no Ethernet Physical port as such.
The Ethernet frame has its Ethertype field set to 0x88B7.