设备pos口对接不起来，物理down，协议down怎么办？

通常我们进行cpos或pos口对接的时候，应首先注意端口参数协商。display interface相关端口。注意一下J0,J1,C2字段以及时钟的主从状态，通过flag命令在接口视图下进行修改。

Clock source: Slave

Clock grade: Quality unknown(existing synchronization network)

BER thresholds:

    SD: 10e-6    SF: 10e-4

Regenerator section layer:

    J0(TX): "SR8800"

            53 52 38 38 30 30 00 00 00 00 00 00 00 00 00 00

    J0(RX): ""

            00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

    Alarm: LOS LOF

    Error: 0 BIP(B1)

Multiplex section layer:

    Alarm: SD SF AIS

    Error: 0 BIP(B2), 0 REI(M1)

Higher order path layer:

    C2(TX): 0x2    C2(RX): 0xff

    S1S0(TX): 0x2    S1S0(RX): 0x2

    J1(TX): "SR8800"

            53 52 38 38 30 30 00 00 00 00 00 00 00 00 00 00

    J1(RX): ""

            00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

    Alarm: RDI SLM

    Error: 0 BIP(B3), 0 REI(G1)

           0 PJE, 0 NJE

除此之外大家有什么经验以及方法来解决广域网接口协商的问题呢？欢迎进行分享讨论~