
SFP Operation 25
When the POST has completed, check the Power On Self Test LED to make sure that your Switch is operating correctly. Table 6 shows possible colors for the LED.
Table 6 Power/Self Test LED colors
Color | State | 
  | 
  | 
Green  | The Switch is   | 
Yellow  | The Switch has failed its Power On Self Test.  | 
Off  | The Switch is not receiving power.  | 
  | 
  | 
  | In addition, check the Unit LEDs on all Switches in the stack. If a Unit LED  | 
  | is off, initialization is not complete. 3Com recommends that you do not  | 
  | use the Switch's management interface until the Unit LED is green.  | 
  | If there is evidence of a problem, see “Solving Problems Indicated by  | 
  | LEDs” on page 54.  | 
  | 
  | 
SFP Operation | The following section describes how to insert an SFP transceiver into an  | 
  | SFP port on the Switch 4200  | 
  | SFP transceivers are   | 
  | them from and insert them into any SFP port without having to power  | 
  | down the Switch. | 
Approved SFP The following list of approved SFP transceivers is correct at the time of Transceivers publication.
■3CSFP91 SFP (SX)
■3CSFP92 SFP (LX)
■3CSFP93 SFP (T)
■3CSFP97 SFP (LH)
To access the latest list of approved SFP transceivers for the Switch on the 3Com Corporation World Wide Web site, enter this URL into your internet browser:
http://www.3com.com