Chapter 3. Operation
61202156L2
TDU 120e User Manual
3-9
LEDs
Network Status LEDs
The network status LEDs display the operational condi-
tion of the network interface located on the controller
board in the unit.
LED
Display
Color
Indicates that...
OK
Green
The operation is in the normal mode and no
errors have been detected.
Test Yellow
The network interface is 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
An error has occurred, such as a BPV, OOF,
or CRC.
Alarm
Red
An alarm condition has been detected. Any
alarm condition will activate the alarm relay
for the external alarm device. 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alarm condition is no longer valid, the OK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.
If the alarm conditions have been corrected, the alarm which caused the
activation of the Alarm LED can be viewed under the
U
NIT
H
ISTORY
menu.
Summary of Contents for 1202155L1
Page 1: ...TDU 120e User Manual Part Number 1202156L2 1202155L2 September 2001 61202156L2 1C...
Page 20: ...Table of Contents xx TDU 120e User Manual 61202156L2 1...
Page 22: ...List of Figures xxii TDU 120e User Manual 61202156L2 1...
Page 24: ...List of Tables xxiv TDU 120e User Manual 612022156L2 1...
Page 42: ...Chapter 2 Installation 2 12 TDU 120e User Manual 61202156L2 1...
Page 92: ...Chapter 5 Configuration Menu 5 30 TDU 120e User Manual 61202156L2 1...
Page 108: ...Chapter 7 Test Menu 7 12 TDU 120e User Manual 61202156L2 1...
Page 116: ...Chapter 8 Remote Management Menus 8 8 TDU 120e User Manual 61202156L2 1A...
Page 124: ...Appendix A Understanding SNMP A 8 TDU 120e User Manual 61202156L2 1...