Foundry Networks OSI Manuale Utente

Pagina di 66
D
ESCRIPTION
 
OF
 H
ARDWARE
February 2003
© 2003 Foundry Networks, Inc.
2-3
Description of Hardware
10BASE-T/100BASE-TX Ports
These are dual-speed RJ-45 ports. Because all ports on this switch support 
automatic MDI/MDI-X operation, you can use straight-through cables for 
all network connections to PCs or servers, or to other switches or hubs. 
(See“100BASE-TX/10BASE-T Pin Assignments” on page B-3.) 
Each of these ports support auto-negotiation, so the optimum 
transmission mode (half or full duplex), and data rate (10 or 100 Mbps) can 
be selected automatically. If a device connected to one of these ports does 
not support auto-negotiation, the communication mode of that port can 
be configured manually.
Each port also supports IEEE 802.3x auto-negotiation of flow control, so 
the switch can automatically prevent port buffers from becoming 
saturated.
1000BASE-T/SFP Ports
These are combo Gigabit RJ-45 ports with shared Small Form Factor 
Pluggable (SFP) transceiver slots. If an SFP transceiver (purchased 
separately) is installed in a slot and has a valid link on the port, the 
associated RJ-45 port is disabled. 
The 1000BASE-T RJ-45 ports support automatic MDI/MDI-X operation, 
so you can use straight-through cables for all network connections to PCs 
or servers, or to other switches or hubs. (See“1000BASE-T Pin 
Assignments” on page B-4.)