3Com OfficeConnect 3CRWE554G72 User Manual page 17

Rear Panel 17
depending on the device to which they are connected and the type of
cable used.
10 Four 10/100 LAN ports
Using suitable RJ-45 cable, you can connect your Gateway to a computer,
or to any other piece of equipment that has an Ethernet connection (for
example, a hub or a switch). The LAN ports will automatically set
themselves to MDI or MDIX depending on the device to which they are
connected and the type of cable used.