3Com 100 TX User Manual

3-12 CHAPTER 3: MAKING FMS 100-TX HUB CONNECTIONSOperation LEDs Table 3-3 interprets the meaning of the hub operation LEDs.Unit Digital Display The front panel unit digital display (see Figure 3-11) provides a numericdesignation for each component in a hub stack, including a Management Unitif one is present. Unit numbers are assigned dynamically as the units areplugged into the stack. The Management Unit ID is assigned after thePower-On Self-Test (POST) has run. The number 1 indicates the device that hasno other unit above it; in other words, the hub (or Management Unit) that is onthe top of the stack and connected by a hub expansion cable to thecomponent immediately below it.Figure 3-11 Unit Digital DisplayTable 3-3 Hub Operation LEDsLED Color Status MeaningFAN FAIL Amber ON One or both of the two internal fanshave failed.OVERTEMP Amber ON The internal temperature exceeds 158° F(70° C).COLLISION Green ON The segment is experiencing collisions.CLS II (Class II) OFF The FMS 100-TX Hub does not supportClass II configuration. This LED isnonfunctional.CLS I (Class I) Green ON The FMS 100-TX Hub supports Class Iconfiguration, which means that onlyone repeater or hub stack can be usedbetween two end stations.PWR (Power) Green ON The hub is receiving power.12xUNITSTATUS1 2 3 4 5 6 7 8 9 10 11 12 13ACTIVITYLINKPARTITIONCLSII3C250-TX/ΙCLSIPWRFAN FAILOVERTEMPCOLLISION®