Signamax
™
065-7921PoE 12-Port 10/100/1000BaseT/TX Web Smart PoE Switch
27
3-2. Media Access Control (MAC)
MAC Addressing
Because LAN is composed of many nodes, for the data exchanged among these nodes,
each node must have its own unique address to identify who should send the data or should
receive the data. In OSI model, each layer provides its own mean to identify the unique
address in some form, for example, IP address in network layer.
The MAC is belonged to Data Link Layer (Layer 2), the address is defined to be a 48-bit
long and locally unique address. Since this type of address is applied only to the Ethernet LAN
media access control (MAC), they are referred to as MAC addresses.
The first three bytes are Organizational Unique Identifier (OUI) code assigned by IEEE.
The last three bytes are the serial number assigned by the vendor of the network device. All
these six bytes are stored in a non-volatile memory in the device. Their format is as the
following table and normally written in the form as aa-bb-cc-dd-ee-ff, a 12
hexadecimal digits
separated by hyphens, in which the aa-bb-cc is the OUI code and the dd-ee-ff is the serial
number assigned by manufacturer.
Fig. 3-2 SAP Format
