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LED Indicators
Page 3-2
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 re-transmission.
100M
10M
COL
Power
NetStacker II
Hub ID Number
1
23
4
5
6
7
8
9
10 11
12
1
23
4
5
6
7
8
13
14 15
16
17
18
19
20
21
22 23
24
100Mbps
10Mbps
100Mbps
10Mbps
Power
Collision
10 Mbps
Hub ID
100 Mbps
100 Mbps
10 Mbps
SHBBook Page 2 Wednesday, March 3, 1999 8:03 PM