Description: The current APS state of this protection group noRequestNull(0): There is no request or the far end has configured lockout noRequestNormal(1): The far end has request which makes normal traffic signal be selected from the protection transport entity lockout(2): Lockout has been configured forcedSwitch(3): Force switch has been configured signalFailW(4): The working transport entity has SF signalFailP(5): The protection transport entity has SF manualSwitch(6): Manual switch has been configured waitToRestore(7): SF or SD in the working transport entity has been cleared exerciseNull(8): Exercise of the APS protocol when normal traffic signal is selected from the working transport entity exerciseNormal(9): Exercise of the APS protocol when normal traffic signal is selected from the protection transport entity doNotRevert(10): There is no request after a switch reason has been cleared in non-revertive operation signalDegrW(11): The working transport entity has SD signalDegrP(12): The protection transport entity has SD manualSwitchW(13): Manual switch to working has been configured mappingSwitchW(15): The far end has request which makes normal traffic signal be selected from the working transport entity mappingSwitchP(16): The far end has request which makes normal traffic signal be selected from the protection transport entity reverseRequestNull(17): Exercise has been configured at the far end and normal traffic signal is selected from the working transport entity reverseRequestNormal(18): Exercise has been configured at the far end and normal traffic signal is selected from the protection transport entity