3Com 3CBLSG48 User Manual page 50

Table 9 describes the color and the port status:
Table 9 Color Key Definitions
Color Port Status
White Unconnected. No link detected.
Yellow Lower speed on 10/100/1000M port.
Green Maximum speed 10/100/1000M RJ45 or RJ45 SFP.
Indicates that a link was detected.
Light Blue SX/LX SFP. Indicates that a link was detected.
Light Gray Port has been set to inactive by User or Protocol.
Dark Blue Port has been selected by user.
Red Port or Transceiver has failed POST or Transceivers not
recognized.
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ETTINGS