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Chapter 2: Introduction
XPress DR+ User Guide 16
Figure 2-3. Example of Cascading Multiple XPress DR+ Units
Note: For examples of wireless applications, see Chapter 4: XPress DR+W.
Addresses and Port Numbers
Hardware Address
The hardware address is also referred to as the Ethernet address or MAC address. The
first three bytes of the Ethernet address are fixed and read 00-20-4A, identifying the unit
as a Lantronix product. The fourth, fifth, and sixth bytes are unique numbers assigned to
each unit.
Figure 2-4. Sample Hardware Address
00-20-4A-14-01-18 or 00:20:4A:14:01:18
IP Address
Every device connected to an IP network must have a unique IP address. This address
references the specific unit.
Port Numbers
Every TCP connection and every UDP datagram is defined by a destination IP address
and a port number. For example, a Telnet application commonly uses port number 23. A
port number is similar to an extension on a phone system.