ADTRAN TSU 120e user manual LED Descriptions CSU Status, Button. See Operation Keys on

Chapter 3. Operation

Table 3-1. Front Panel Descriptions

Name	Description
Numeric Keypad	The numeric keypad contains the numbers
	0 through 9 which are used to activate
	menu items and enter information (such as
	the IP address).
Shift (entering	Enter special function keys by pressing
special function	and holding Shift before pressing the key
keys)	representing the desired character.
	To activate a special function key rather
	than a number, press and hold Shift; then
	the button. See Operation Keys on page 3-5
	for a description of the function keys.
	If a key is pressed without using Shift, the
	numbered item becomes active instead of
	the special function key.

LED Descriptions

CSU Status

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

OK (GREEN) Indicates the operation is in the normal mode and no

	errors have been detected.
TEST	Indicates that the network interface is operating in a test
(YELLOW)	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 When the alarm condition is no longer valid, the OK LED activates (turns on).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 120 User Manual 61202129L1-1