完成A接口倒換后,BSC出現(xiàn)2992錯誤(BTS AND TC UNSYNCHRONIZATION CLEAR CALLS ON A INTERFACE alarm),說明A接口可能存在哪類問題()
A.A interface exist crossconnect circuit
B.inconsistent CCSPCM between BSC and MSC
C.A interface exist loop circuit
D.inconsistent circuit number in circuit group between BSC and MSC