Allied Telesis AT-CM70S - Manual (Page 42)

Chapter 1: Converteon™ Fast Ethernet and Gigabit Ethernet Line Cards
42
Serial Port LEDs Table 9 lists the serial port LED’s provisioned on the Mezzanine Adapter
and are viewable through the line card front panel.
LED Color Description
SER MODE
[1 to 4] Green The serial port is operating in RS-232 mode.
OFF The serial port is operating in RS-422/485
mode.
SER ACT
[1 to 4] Green The serial port has established a valid link.
OFF The serial port has detected TX/RX activity.