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3com 4250T Manual De Usuario

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About the Switch 4200 Series
15
Fiber GBIC's. 
The default state for these ports is auto-negotiation enabled, where 
speed, duplex and flow control modes are negotiated. Because 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-T GBIC's
These ports will auto-negotiate to 1000BASE-T, full duplex only. Although 
it is not possible to disable auto-negotiation it is possible to change the 
advertised capabilities for flow control support, effectively enabling or 
disabling flow control.
LEDs
 lists LEDs visible on the front of the Switch, and how to read their 
status according to color. For information on using the LEDs for problem 
solving, see 
.
It is not possible to determine the duplex mode from the LEDs. For more 
detailed information, refer to the “SuperStack
 
3 Switch Management 
Interface Reference Guide” on the CD-ROM that is supplied with the 
Switch.
Table 4   LED behavior  
LED
Color
Indicates
Port Status LEDs 10BASE-T/100BASE-TX ports
Green 
A 100 Mbps link is present and the port is enabled.
Green flashing Packets are being transmitted/received on the port.
Yellow 
A 10 Mbps link is present and the port is enabled.
Yellow flashing Packets are being transmitted/received on the port.
Green / Yellow 
alternating
A 10 or 100 Mbps link is present, but the port is disabled.
Off
No link is present.
Port Status LEDs GBIC ports
Green 
A 1000 Mbps link is present and the port is enabled.
Green flashing Packets are being transmitted/received on the port.
Port Status LEDs 10/100/1000BASE-T ports
Green 
A 1000 Mbps link is present and the port is enabled.
(continued)
DUA1730-0AAA04.book  Page 15  Thursday, November 17, 2005  2:59 PM