Checking the LEDs
Enterasys B5 Gigabit Ethernet Switch Hardware Installation Guide 3-5
UP LED
TheSTACKUPLEDindicate sthestateoftheconnectiontotheswitchstackdownconnector,as
describedinTable 3‐3.
DOWN LED
TheSTACKDOWNLEDindicatesthestateoftheconnectiontotheswitchstackupconnector,as
describedinTable 3‐4.
Table 3-3 UP LED Definitions
Color State Recommended Action
Off No valid connection to switch stack down 
connector.
1. Make sure the switch connected to the 
stack down connector is powered on.
2. Replace cable with a known good one. 
3. If the problem still exists, contact 
Enterasys Networks for technical support.
Green Solid. Valid connection to switch stack 
down connector.
None.
Blinking. Information is being transferred 
through the high-speed stacking cable.
None.
Table 3-4 DOWN LED Definitions
Color State Recommended Action
Off No valid connection to switch stack up 
connector.
1. Make sure the switch connected to the 
stack up connector is powered on.
2. Replace cable with a known good one. 
3. If the problem still exists, contact 
Enterasys Networks for technical support.
Green Solid. Valid connection to switch stack up 
connector. 
None.
Blinking. Information is being transferred 
through the high-speed stacking cable.
None.