EXFO FTB-8500 Series for FTB-200 - Manual (Page 454)

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440 FTB-8500 Series and FTB-8120NGE/8130NGE
PBB-TE Interface configuration

B-VLAN (Backbone Virtual Local Area Network)
ID: Enter the B-VLAN identifier. Choices are 0 through 4095 (refer to
VLAN/B-VLAN on page 434 for more information).
Priority: Select the B-VLAN user Priority Code Point (PCP). Choices are
0 to 7; (refer to VLAN/B-VLAN on page 434 for more information). The
default setting is 0 (000 - Low).
Drop Eligible: When the Drop Eligible check box is selected
(DEI = 1), these transmitted frames will be dropped first on receipt
when congestion occurs under test. This setting is disabled by default.