EXFO FTB-8500 Series for FTB-500 - Manual (Page 162)

Port Tabs
148 FTB-8500 Series and FTB-8120NGE/8130NGE
Network
Network
Note: Network is only available with Framed Layer 2 and when Through Mode
(FTB-8510B) is not selected.
Press TEST, Port, and Network.
Coupled to stream
For BERT and Frame Analyzer test, the port’s VLAN, IP, and PBB-TE
parameters are coupled to the stream (Stream 1 for Frame Analyzer)
when the Coupled to stream check box is selected. Thus only the source
MAC Address, and MPLS parameters are configurable. The Coupled to
stream check box is selected by default. The Coupled to stream check
box is not available with RFC 2544, Smart Loopback, and TCP
Throughput tests.