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Interconnection Between the Electrical Interface of the OSN 3500 and the Electrical Interface of the Microwave Equipment Fails Because the Internal Cables of the Microwave Equipment Are Incorrectly Connected

Publication Date:  2012-07-25 Views:  53 Downloads:  0
Issue Description
In a network, three OSN 3500 stations A, B, and C are networked into a chain. A and B are connected through the microwave equipment provided by manufacturer X; B and C are also connected in through the microwave equipment provided by manufacturer X. There are VC-12 services between stations A and C, and between B and C. Station C cannot be logged in to on station B; services from station A to C are normal; services from stations B and C are unavailable.  
Alarm Information
There are R_LOS alarms in the directions B―>A and B―>C. Station C cannot be logged in to on station B; services from station A to C are normal; services from stations B and C are unavailable. The corresponding channel of the tributary board reports the TU_AIS alarm and station C reports the LP_UNEQ alarm.  
Handling Process
According to the design for the cutover, on the microwave equipment, ports 1 and 2 are connected to ports A and B respectively which are then connected to port 1 of Huawei EU04 board. See figure 1. On the microwave equipment, ports 3 and 4 are connected to ports C and D respectively which are then connected to port 2 of Huawei EU04 board. See figure 2. In actual configuration, on the microwave equipment, ports 1 and 2 are connected to ports 3 and 4 respectively. That is, ports A, B, C, and D of the microwave equipment are not used. Hence, actually, Huawei EU04 board does not connect to the microwave equipment. As a result, the R_LOS alarm occurs and services between B and C are unavailable. Refer to the following attachment for figure 1 and figure 2. 
Root Cause
Loop back the electrical interface of the OSN 3500. The R_LOS alarm is cleared. This indicates that the OSN 3500 equipment is normal.  
Suggestions
When Huawei equipment is connected to equipment provided by other vendors, if the interconnection fails, Huawei engineers should first check whether the failure occurs due to Huawei equipment. If the problem does not lie in Huawei equipment, check the configuration of the equipment provided by other vendors to locate the problem.  

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