Alcatel-Lucent 9500 MXC User Manual page 870

Vol. VI-F-14
• The secondary RAC decides on a frame-by-frame basis, which receive stream
(primary or secondary) to pass to the TDM bus. The decision favours the data
source for the previous frame if both frames are un-errored.
• The online Rx RAC only switches (secondary to primary RAC) in the event the
secondary RAC is missing/incorrect, or there is a software load failure. When
either occurs, the received data is sent directly to the TDM bus by the primary
RAC.
• Similarly, the online Tx RAC only switches (primary to secondary) in the event
the primary RAC is missing/incorrect, or there is a software load failure. When
either occurs, the transmit data is uplifted directly from the TDM bus by the
secondary RAC.
Frequency Diversity
Figure F-6.
Online
Primary RAC
Rx
Tx
DAC
ODU
ODU
Online
Tx Secondary RAC
Rx
Tx Rx
TDM Bus
Tx Diversity Bus
Rx Diversity Bus
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