Technical data

Using the Centillion 100 ATMSpeed/155 Switch Modules and Media Dependent Adapters
2-20 893-01047-A
LED Sequence at Startup
At startup, all ATMSpeed/155 module LEDs turn on for 2 or 3 seconds. Then they
turn on and off in the following sequences, depending on the type of module.
On the four-port version of the ATMSpeed/155 module, the ATMSpeed/155 MCP
module, and the ATMSpeed/155 MDA and MDA MCP modules with six LEDs
per port, the following sequence occurs:
• The En LED turns on when the port is enabled through network management
software.
• The LOS, LOF, and FERF LEDs turn off when valid SONET framing is
received on the port.
On ATMSpeed/155 modules with three LEDs per port, the following sequence
occurs:
• The Enabled LED turns on when the port is enabled through network
management software.
• The In Service LED turns on when valid SONET framing is received on the
receive port.