Specifications

1 - 2
1.2 Addresses
The devices and computers connected to Ethernet must have their own addresses to
communicate on the network.
For Ethernet, the addresses which the user needs to consider are basically IP
addresses.
Text
Photo
Destination
address (Address)
Data Header
(Packet) Communication format
Postbox
Postal network
Mail box
A's house
Destination
address (Address)
1.2.1 MAC address (Ethernet address)
The MAC address (Media Access Control Address) is a unique physical address which
is assigned to each network device.
(No other devices have the same MAC address.)
In Ethernet, it is shown as a 6-byte code: a vender code of 3 bytes (managed by IEEE
management) indicating an equipment manufacturer and a node number of 3 bytes
(managed by each manufacturer). (*1)
As each Ethernet-connected device communicates automatically getting a MAC
address from IP addresses designated by the user, the user need not be take account
of it.
The MAC address is sometimes called "Ethernet address" or "Internet address",
however, note that it differs from the IP address described below.
*1 MAC address of the Ethernet module is indicated in MAC ADD. of the rating plate
located on the side of the module.