Chapter 15. Diagnostics
Vol. IV-15-66 Alcatel-Lucent
Figure 15-25. 9500 MXC INU/INUe Plug-in Loopbacks
• 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.
DAC 16x RAC 30
Trib 1
Trib 16
Mux/Demux
Mux/Demux
TDM Bus
IF
Mod/Demod
ODU
Line facing
DAC Loopbacks
RAC Loopbacks
Radio facing
Digital
IF
LIU
Circuit Loopbacks
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