3com 3C39024 Manuale Utente

C

HAPTER

 1: S

WITCH

 3900 S

YSTEM

 

AND

 S

ETUP

 O

VERVIEW

The Switch 3900 back panel has two expansion slots 
that can hold optional Gigabit Ethernet modules. 
These modules are available in the following 
configurations:

■

1000BASE-SX Module —

 

Multimode fiber with 

paired SC connectors. It supports links of up to 
260 meters (852 feet) over 62.5-micron multimode 
fiber or up to 525 meters (1722 feet) over 
50-micron multimode fiber.

■

1000BASE-LX Module — Single-mode fiber with 
paired SC connectors. It supports links of up to 3.0 
kilometers (1.86 miles) over 8-micron to 10-micron 
single-mode fiber.

The modules have the same physical configuration 
and are installed in the same way. 

For more information about installing and using the 
optional Gigabit Ethernet modules, see the 
1000BASE-SX/1000BASE-LX Gigabit Ethernet Module 
Installation Guide that is on the Documentation CD 
and shipped with either module.

This section describes one way to place the Switch 
3900 in your network to alleviate traffic congestion.

The rapid deployment of Fast Ethernet has increased 
bandwidth demand many times over, not only by 
supporting 100 Mb connections on the network but 
also by placing demands on the servers to manage 
the traffic coming through those connections.

Figure 1-4 shows how the Switch 3900 provides 
direct 100 Mb links to devices on the network 
through its Fast Ethernet ports and up to three 
dedicated Gigabit links to your network’s servers. 

In this sample configuration, the Switch 3900 can 
provide up to 36 clients on your network with a 
dedicated 100 Mb link and can multiplex the client 
traffic for Gigabit-speed access to the servers. (You 
can use one port on the Switch 3900 for in-band 
management as well as for network traffic.)