Alcatel-Lucent 9500 MXC User Manual page 628

Chapter 15. Diagnostics
9500 MXC INU/INUe Plug-in Loopbacks
Figure 15-25.
Trib 1
Trib 16
DAC Loopbacks
Line facing
Radio facing
RAC Loopbacks
Digital
IF
Circuit Loopbacks
Vol. IV-15-66
DAC 16x
• Trib loopbacks are applied per trib. Multiple loopbacks can be set at the same
time.
• RAC/radio loopbacks affect all traffic on a RAC/radio. Select Digital or IF.
• Circuit loopbacks can only be set for a Node, and are applied per circuit. Only
one circuit loopback can be set at a time. For information on circuit loopbacks,
refer to Circuit Loopbacks for 9500 MXC Node on page 15-67.
Note: An ODU cable loopback is not included. Instead, confirmation of ODU
cable integrity is provided by:
• An ODU cable alarm. RACs and IDUs include an ODU cable alarm.
• Presence of ODU and ODU alarms:
• If the ODU is shown as disconnected (cannot be seen by its RAC) a probable
cause is an ODU cable failure.
• If an ODU sourced alarm is on, its presence in the Alarms screen indicates
normal ODU cable communications; an ODU cable failure is not indicated.
• If an ODU sourced alarm is on and its associated RAC is not in demod lock
alarm, the local receive function is operating normally. Conversely, if the
remote end RAC is not in demod lock alarm, the local transmit function is
operating normally; an ODU cable failure is not indicated.
RAC 30
Alcatel-Lucent