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Ethernet Tester Analyzer 139

B Ethernet Frame Structure

Ethernet Frame Structure

 Destination MAC Address: 6 bytes field that contains MAC address of

the destination network node.

 Source MAC Address: 6 bytes field that contains MAC address of the

frame source network node.

 Length/Type: The field contains 16-bits integer and possesses either of

the following values:

 If the contained number is less than or equal to 1500, then the

value is set to Length and defines the length of the data field.

 If contained number is more than or equal to 1536, then the value

is set to Type value and specifies type of the used protocol.

 Data: Data field can contain from 46 or 42 (in the case of a frame with

VLAN-tag) to 1500 bytes.

 Pad: If the data field is less than 46 bytes then the containing frame is

complemented to the minimum allowed length (64 bytes) with the

padding field.

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Exfo ETS-1000 Bedienungsanleitung Seite 147