SHBBook Page 2 Wednesday, March 3, 1999 8:03 PM
LED Indicators
COL
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Power | 10M |
Power
Hub ID
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Hub ID Number |
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13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 100Mbps |
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Collision
Figure 3-2 24 port hub LEDs
Power LED
The Power LED is green and should always be lit when the NetStacker II is in use. After power is turned on, the LED indicators should respond as follows:
❑All LED indicators blink momentarily. This represents a system reset.
❑The Port Link Activity LEDs blink on. The ports that are not con- nected then blink off.
❑The Power LED lights and remains ON.
If the Power LED is not lit, check to make sure that the power cord is properly connected at both ends. If the Power LED still remains unlit, determine whether the outlet is functional by plugging another device into it.
Collision Indicator LEDs
The collision indicator LEDs (labeled “COL”) are amber. The lower LED indicates collisions on a 10Mbps segment connected to the hub, and the upper LED indicates collisions on a 100Mbps segment connected to the hub. The default condition of these indicators is unlit. A collision occurs when two or more stations in the Ethernet network attempt to transmit data at the same time. If a collision is detected, the appropriate LED flashes while the stations re- transmit. Collisions may be expected when two or more workstations are connected to a hub. These collisions are a normal feature of ethernet traffic, and are not a problem due to
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