Install Guide

7. Locator LED
8. QSFP+ LED—top row port
9. Stack ID number
10. QSFP+ LED—bottom row port
Table 1. S4048T-ON I/O-side LED behavior
LED Description
10 GBT
● Off—no link
● Solid green—link at 10G speed
● Blinking green—port activity at 10G speed
● Solid amber—link at speed lower than 10G
● Blinking amber—port activity at lower than 10G speed
● Solid blue—port locator function
Master
● Off—switch is in stacking slave mode
● Solid green—system is in stacking master or standalone
mode
System
● Solid green—normal operation
● Blinking green—booting
● Solid amber—critical system error
● Blinking amber—noncritical system error—fan failure or
power supply failure
Power
● Solid green—normal
● Solid amber—POST is in progress
● Blinking amber—power supply failed
● Off—no power
Fan
● Solid green—fan powered and running at the expected
RPM
● Blinking amber—fan failed, including incompatible airflow
direction when you insert the PSU or fan trays with
differing airflows
Locator
● Off—locator function is disabled
● Blinking blue—locator function is enabled
QSFP+ port when used as one 40G port—only first LED is
used in 40G mode
● Off—No Link
● Solid green—link at 40G speed
● Blinking green—port activity at 40G speed
● Solid amber—link at speed lower than 40G
● Blinking amber—port activity at lower than 40G speed
● Blinking amber one second on/one second off—port
locator function
QSFP+ port when used as four ports of 10G—all four LEDs
are used
● Off—no Link
● Solid amber—4x10G speed
● Blinking amber—port activity at 4x10G speed
● Blinking amber one second on/one second off—port
locator function
Stack ID Number
Displays the stack unit number of the switch
Displays 1 by default if switch is not part of a stack
8 The S4048T-ON System