Exfo ETS-1000 Manuel d'utilisateur Page 148

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Ethernet Frame Structure
140 ETS-1000
Frame Check Sequence: 4-bytes field contains the checksum.
Ethernet Frame with VLAN tag structure
Tag Protocol Identifier: 16 bits field defines that the frame belongs to
the 802.1Q [1] standard.
Tag Control Information: TCI field contains three following fields.
Priority: User (VLAN) Priority. Three bits that contain information
about the frame priority (eight possible priority values are available
([1])).
CFI: Canonical Format Indicator is an one-byte flag which must be
equal to 0 (null) for Ethernet frames.
VLAN ID: VLAN Identifier (VID) is a 12-bit identifier which is
defined in the 802.1Q standard [1]. VID uniquely defines VLAN to
which the current frame belongs to.
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