Alcatel-Lucent 9500 MXC User Manual page 872

Pass-through, Drop and Wrapping Action
Figure F-7.
West-facing RAC/ODU
ODU
Primary Rx
Secondary Tx
Normal condition
Primary ring with pass-
through and drop traffic
Secondary ring carries
no traffic
Break between Nodes C & D
Primary ring wrapped to
secondary at Node C
Secondary ring wrapped
to primary at Node D
Break between Nodes B & C
Primary ring wrapped
to secondary at Node B
Secondary ring wrapped
to primary at Node C
Primary
Secondary not used
Secondary used
Vol. VI-F-16
East-facing RAC/ODU
Node B
Tx
Tx Rx
DAC Tx Rx
Node B
Pass-through traffic
Add-drop traffic
Rx Tx
Rx Tx
Rx
Tx
Local add
Local drop
ODU
Primary Tx
Rx
Secondary Rx
TDM Bus
No break
No break
Break
Pass-through circuits
Node C
Node D
Node D
No break
Break
No break
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