Only some special ports on tributary board can supports the tributary clock,the details is as below:
In Metro500:Only the first and second ports for PL1D、SP2D,and the first port for PL1S.
In Metro1000:Only the first and fifth ports for SP1D、SP2D,and the 1st、10th、19th、28th、37th、46th ports for PD2T,the 1st、10th、19th、28th ports for PD2D.the 1st、10th ports for PD2S,the 1st port for SP1S.
In 155/622M & 2500+:Only the first and fifth ports on tributary board can supports the tributary clock.
In OSN1500/OSN2500O/SN3500：Only the first and 9th ports for PQ1/PQM,and the first and 4th ports for PD3.
Just share my experience to everyone. If face E1 clock iusse ,it can be used.