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3.4 Operating Mode
All switched ports are designed as auto-negotiation capable switched
ports. Each port can determine the speed and duplex type used automati-
cally through an auto-negotiation process with the remote connected
auto-negotiation capable device. The auto-negotiation process is per-
formed upon the connection is made.
When connecting to a non-auto-negotiation device, each port also fea-
tures the capability to auto-sense the connection speed.
The following table lists the operation mode used for the switched port
when it connects to different devices. The operating mode includes the
connection speed and duplex type.
Device Connected
Operation Mode Used
10BASE-T hub
10Mbps, half-duplex
100BASE-TX hub
100Mbps, half-duplex
Auto-negotiation device
Auto-negotiation *2
Non-auto*1 half-duplex device
auto-speed-sensing *3, half-duplex
Non-auto full-duplex device
Not supported
*1 Non-auto : non-auto-negotiation
*2 determined through auto-negotiation process
*3 speed is determined by auto-sensing function
Most of 10BASE-T hubs and 100BASE-TX hubs are non-auto-negotia-
tion devices and operates on half-duplex mode.
