100/1000Base-T And 10/100/1000Base-T Ports; 1000Base-Sx Ports; Gbic Ports - 3Com 4900 (3C17700) Getting Started Manual

Superstack 3 4900 series
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16
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1: I
S
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3 S
4900 S
HAPTER
NTRODUCING THE
UPER
TACK
WITCH
ERIES
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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