Two NS2s are used for the ODU1 regeneration. Inloop is set on an optical interface on the NS2 (clock inloop). The BUS_ERR alarm persists after the loop is released. Services are abnormally transmitted and received on the system side.
Avoid long-lasting clock loop during practical applications and tests. If the problem occurs, solve it by performing a warm reset on the board.
When the clock is looped for a long time, the data conversion module of the board is abnormal and even locked after the loop is released.