10/100/1000Base-T Ports; 1000Base-Sx Ports; Gbic Ports - 3Com SuperStack 3 4950 Getting Started Manual

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HAPTER NTRODUCING THE UPER TACK WITCH
10/100/1000BASE-T The 12 10/100/1000BASE-T ports have RJ-45 connectors and are
Ports configured as Auto MDIX (cross-over).
The default state for these ports is auto-negotiation enabled, where the
speed, duplex and flow control modes of a link are automatically
detected to provide the highest available bandwidth with the link partner.
Alternatively, auto-negotiation can be disabled. These ports can be
manually configured to 10 Mbps or 100 Mbps half duplex and 10 Mbps
or 100 Mbps full duplex. It is not possible to manually configure a
1000BASE-T link as auto-negotiation is mandatory in the 1000BASE-T
standard.

1000BASE-SX Ports

The 6 auto-negotiating 1000BASE-SX ports have MT-RJ connectors.
The default state for these ports is auto-negotiation enabled, where the
speed, duplex and flow control modes are negotiated. As the speed and
duplex modes are fixed by the media type, only the flow control is
negotiated with the link partner. Alternatively, auto-negotiation can be
disabled and the flow control setting can be manually configured.

GBIC Ports

The 6 GBIC ports support fiber Gigabit Ethernet short-wave (SX),
long-wave (LX) and long-haul (LH70) GBIC transceivers in any
combination. This offers you the flexibility of using GBIC transceivers to
provide connectivity between the Switch and remote 1000 Mbps
workgroups or to create a high capacity aggregated link backbone
connection.
The default state for these ports is auto-negotiation enabled, where the
speed, duplex and flow control modes are negotiated. As the speed and
duplex modes are fixed by the media type, only the flow control is
negotiated with the link partner. Alternatively, auto-negotiation can be
disabled and the flow control setting can be manually configured.