3Com Switch 4500 Family, Руководство по началу работы, Страница: 17 / 134

Switch 4500 — Front View Detail 17
provide the appropriate connection. Alternatively, you can manually set
these ports to 10BASE-T half duplex, 10BASE-T full duplex, 100BASE-TX
half duplex or 100BASE-TX full duplex. The maximum segment length is
100 m (328 ft) over Category 5 twisted pair cable.
1000BASE-X SFP Ports SFP (Small Form Factor Pluggable) ports support fiber Gigabit Ethernet
short-wave (SX), long-wave (LX), long-haul (LH70) and copper (T) SFP
Transceivers in any combination. This offers you the flexibility of using SFP
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 (except 1000BASE-T which auto-negotiation is mandatory) and
the flow control setting can be manually configured.
The Switch 4500 26 Port has 2 x 1000BASE-X SFP ports and 2 X
10/100/1000BASE-T ports, which are implemented as two dual
personality ports. Only one port in each pair can be enabled at any one
time.
The Switch 4500 50 Port and Switch 4500 PWR 26 and 50 Port have 4 x
1000BASE-X SFP ports. The first two SFP ports support all 3Com gigabit
SFP modules. The last two SFP ports have 2 x 1000BASE-T SFP
transceivers installed to match the dual personality port configuration of
the Switch 4500 26 Port. Only one port in each pair can be enabled at
any one time.
Console Port The console port allows you to connect a terminal and perform remote or
local out-of-band management. As the console port on the Switch is an
RJ-45 port, you will need to connect an RJ-45 to DB9 converter cable to a
standard null modem cable in order to connect a terminal.