3Com 3C17700 Getting Started Guide - Page 16

/1000BASE-T and 10/100/1000BASE-T Ports, 1000BASE-SX Ports, GBIC Ports

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16 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4900 FAMILY 100/1000BASE-T and The 100BASE-TX/1000BASE-T and 10BASE-T/100BASE-TX/1000BASE-T 10/100/1000BASE-T ports have RJ-45 connectors and are configured as Auto MDIX Ports (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 half duplex (if supported), 100 Mbps half duplex, 10 Mbps full duplex (if supported), 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. The maximum segment length is 100 m (328 ft) over Category 5 twisted pair cable. 1000BASE-T operation only supports full-duplex mode. 10BASE-T (10 Mbps) is only supported on Switch 4924 and 4950. 1000BASE-SX Ports 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. 1000BASE-SX ports do not support auto-negotiation of speed and only support full duplex mode. GBIC Ports 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.

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16
C
HAPTER
1: I
NTRODUCING
THE
S
UPER
S
TACK
3 S
WITCH
4900 F
AMILY
100/1000BASE-T and
10/100/1000BASE-T
Ports
The 100BASE-TX/1000BASE-T and 10BASE-T/100BASE-TX/1000BASE-T
ports have RJ-45 connectors and are 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 half duplex (if supported), 100 Mbps
half duplex, 10 Mbps full duplex (if supported), 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.
The maximum segment length is 100 m (328 ft) over Category 5 twisted
pair cable.
1000BASE-T operation only supports full-duplex mode.
10BASE-T (10 Mbps) is only supported on Switch 4924 and 4950.
1000BASE-SX Ports
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.
1000BASE-SX ports do not support auto-negotiation of speed and only
support full duplex mode.
GBIC Ports
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.