For RTN900V1R1 product,RTN03312001 is tracing RTN03316001 Via IFE2 board.
After enable the SSM protocol in RTN03312001, the sync source of RTN03312001 change to "SETS".
The clock tracing chain was broken between the radio link.
SYNC_C_LOS reported by RTN03312001
1、Disable the SSM on NE(RTN03312001)
2、The clock tracing recoved and the alarm disappeared.
1、Chech the RSL on IFE2 of RTN03312001, the RSL is normal as before.
2、In U2000 "clock subnet configuration" view the clock quality of IFE2 can not be extrac for NE RTN03312001.
We doubt that "enable SSM" is the cause of failure.
1、For RTN900V1R1 IFE2 board do not support SSM protocol.
2、If the SSM was enabled on the NE, due to the S1 byte information indicate that the clock quality from IFE2 is not available. So the clock traing mode will switch to the
next priority. For example, RTN03312001 have set 2 clock source in advance, 1st is IFE2 and 2rd is "SETS". After the SSM enable, the IFE2 clock source is not
available(S1 byte 0f), the systerm clock switch to "SETS"(S1 byte G.813).
1, If the IFE2 is usded as a clock source, it is better not to enable the SSM on this NE.
2, If the customer insist to enable the SSM in this NE, the work arround is to manually set the quality as G.811/G.812/G.813(insert S1 to IFE2) to IFE2.