ADTRAN 1202076L2#DC, 1202076L1#DC user manual CSU Status LEDs

Chapter 3. Operation

Name	Description
Shift	To enter special function keys, press and release
	Shift before pressing the key representing the
	desired character. See Operation Keys on page 3-5
	for a description of the function keys.
	To activate a special function key rather than a
	number, press Shift and then the key. If you press
	the key without using Shift, the numbered item
	becomes active instead of the special function key.

CSU Status LEDs

The CSU status LEDs display the operational condition of the network interface located on the controller board in the unit.

Name	Description
OK (green)	Indicates the operation is in the normal mode and no
	errors have been detected.
Test (yellow)	Indicates that the network interfaces are operating in a
	test mode. This includes a self-test or a test loopback.
	When lighted, this LED also indicates that normal data
	flow is not occurring on the network interface.
Error (red)	Indicates an error such as a BPV, OOF, or CRC.
Alarm (red)	Indicates an alarm condition has been detected. When the
	alarm condition is no longer valid, the OK LED activates
	(turns on).
	To view an alarm condition, select the active alarm menu
	item or select Alarm by pressing Shift 8.
	If the alarm conditions have been corrected, the alarm
	which caused the activation of the Alarm LED can be
	viewed under the Unit History menu.

3-2 TSU 600 User Manual 61202076L1-1