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The port LED is amber while Spanning Tree Protocol (STP) discovers the topology and searches for loops. This can
take up to 30 seconds, and then the port LED turns green. If the port LED does not turn on:
— The device at the other end might not be turned on.
— There might be a cable problem or a problem with the adapter installed in the attached device. For solutions to
cabling problems, see Troubleshooting, page 73
3. Reconfigure and reboot the connected device if necessary.
4. Repeat Steps 1 through 3 to connect each device.
Installing and Removing SFP Modules
These sections describe how to install and remove SFP modules. SFP modules are inserted into SFP module slots on the
front of the switch. Field-replaceable SFP modules provide the uplink interfaces, send (TX) and receive (RX).
You can use any combination of rugged SFP modules. See Table 2 on page 17 for a list of supported modules. Each SFP
module must be of the same type as the SFP module on the other end of the cable, and the cable must not exceed the
stipulated cable length for reliable communications. See Table 2 on page 17 for cable stipulations for SFP module
connections.
Caution: When you use commercial SFP modules such as CWDM and 1000BX-U/D, reduce the maximum operating
temperature by 59°F (15°C). The minimum operating temperature is 32°F (0°C).
Caution: To prevent electrostatic-discharge (ESD) damage, follow standard board and component handling procedures.
Warning: Do not insert and remove SFP modules while power is on; an electrical arc can occur. This could cause an
explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before
proceeding. Statement 1087
Figure 39 on page 65 shows an LC SFP module with a bale-clasp latch.
Caution: Do not install or remove the LC SFP module with fiber-optic cables attached because of potential damage to
the cables, the cable connector, or the optical interfaces in the SFP module. Disconnect all cables before removing or
installing an SFP module. Removing and installing an SFP module can shorten its useful life. Do not remove and insert
SFP modules more often than is absolutely necessary.
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