Specifications

12 | The S4820T Switch
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NOTE: The system temperature threshold is 75°C. When one of the thermal sensors exceeds this temperature, the
TEMP LED turns RED.
Table 2-2. 10GBT Ethernet Port LEDs
Table 2-3. QSFP+ Port LEDs
Table 2-1. System LED Displays
Feature Detailed Description Comment
System LED • Solid blue – Normal Operation
• Blinking blue – Booting
• Solid red – Critical system error
• Blinking red – Non-critical system error (fan fail, power supply fail)
I/O side
TEMP LED • Off: Normal temperature
• Solid red – “Over-temp” (Refer to NOTE: at bottom of table)
PSU side
DIAG LED • Off – Normal operating
• Solid green – System Booting or Diagnostics
PSU side
FAN LED • Solid green – fan powered and running at the expected rpm
• Solid red – fan failed
PSU side
STACK LED • Solid blue – Switch in stacking master mode
• Solid green– Switch in stacking slave mode
• Off – Switch in stand alone mode
PSU side
LOCATOR LED • Off – locator function is disabled
• Solid blue – locator function is enabled
PSU side
Feature Detailed Description
Link LED • Off – No Link
• Solid green – Link on 10Gbps speed
• Solid Amber – Link on 100M or 1Gbps speeds
Activity LED • Off – No Link
• Blinking green – Transmit/Receive is active
Feature Detailed Description
Link LED • Off – No Link
• Solid green – Link on 40Gbps speed
• Solid Amber – Link on other speeds
Activity LED • Off – No Link
• Blinking green – Transmit/Receive is active