Exfo ETS-1000G Manuel d'utilisateur télécharger pdf (Page 181)

10 Gigabit Ethernet Analyzer 171

D Ethernet Frame Structure

Destination MAC Address — A destination MAC address. A 6-byte field that

contains an IP address of the network node to which the frame is

addressed.

Source MAC Address — A source MAC address. A 6-byte field that contains

an address of the frame sender.

Length/Type — Length/Type. This field contains a 16-bit integer and can

take on one of two values:

 If the number specified in this field is less than or equal to 1500, then

the field will take on the Length value and it will define a data field's

length.

 If the number specified in this field is greater than or equal to 1536,

then the field will take on the Type value and it will indicate the type of

the protocol being used.

Data — A data field that may contain from 46 or 42 (if the frame contains a

VLAN tag) to 1500 bytes.

Pad — A padding field. If a data field's length is less than 46 bytes, then the

frame will be padded with a padding field to the minimum possible value

(64 bytes).

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Exfo ETS-1000G Manuel d'utilisateur Page 181