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An optical cross-connection fails to be configured on an individual NE because the logical TDC and RDC are not short-circuited on the OAU

Publication Date:  2012-07-25 Views:  30 Downloads:  0
Issue Description
 On an OptiX OSN 6800 NE, the signal flow is as follows: 16-FIU -> 10-OAU -> 12-WSD9 (DM5) -> (AM5) 101-RMU9 (TOA) -> 102-OBU -> 103-D40 -> 301-LSX. When an engineer attempts to configure an optical cross-connection from 16-FIU to 301-LSX, the system displays an error message saying that the connection path does not exist. The error code is 41699. 
Alarm Information

 Null

Handling Process
In the signal flow chart, short-circuit the TDC and RDC on the OAU. The service is successfully configured.
Root Cause
Check the prerequisites for optical cross-connections:
1. Compare the actual wavelength with the logical wavelength on the OTU. It is found that the actual wavelength consists with the logical wavelength.
2. Check the physical and logical fibers span by span. It is found that the DCM exists between the TDC and RDC. In the signal flow chart, however, the logical TDC and RDC are not short-circuited.
A signal runs as follows within the OAU. One channel of multiplexed optical signal received through the IN interface is input to the EDFA optical module. The EDFA optical module amplifies the optical power of the signal and locks the gain of the signal. Then the signal is sent to the DCM through the TDC interface for dispersion compensation and returned through the RDC interface. The signal is then sent to the splitter. The splitter splits the signal into two channels. One channel of optical signal is output through the MON interface. The other channel of amplified optical signal is output through the OUT interface.
As mentioned, the logical TDC and RDC are not short-circuited in the signal flow chart. Therefore, during service configuration, the system reports that the logical connection path does not exist. 
 
Suggestions
 Do not forget to short-circuit the TDC and RDC on an OAU. It is recommended that the T2000 highlight the short circuit in the signal flow chart. 

END