1、光纤交换机异常宕机。接上串口线重启，有以下输出：
The system is coming up, please wait...
Read board ID of 0x88 from addr 0x23
Read extended model ID of 0x1d from addr 0x22
Matched board/model ID to platform index 8
Read board ID of 0x88 from addr 0x23
Read extended model ID of 0x1d from addr 0x22
Matched board/model ID to platform index 11
ERROR: Cannot determine a common read delay for the DIMM(s) installed.
Memory write failed, wrote 0x00000000 @ 0x00000004, read 0x00100000, TR1 0x40400000
Memory write failed, wrote 0x00000000 @ 0x00000004, read 0x00100000, TR1 0x40400001
Memory write failed, wrote 0x00000000 @ 0x00000004, read 0x00100000, TR1 0x40400002
Memory write failed, wrote 0xffffffff @ 0x00000008, read 0x7fffffff, TR1 0x40400003
Memory write failed, wrote 0xffffffff @ 0x00000008, read 0x7fffffff, TR1 0x40400004
.....................
Memory write failed, wrote 0xffffffff @ 0x00000008, read 0x7fffffff, TR1 0x404008b5
Memory write failed, wrote 0xffffffff @ 0x00000008, read 0x7fffffff, TR1 0x404008b6
Memory write failed, wrote 0xffffffff @ 0x00000008, read 0x7fffffff, TR1 0x404008b7
ERROR: Cannot determine a common read delay for the DIMM(s) installed.
Halting the CPU...
可以判断为内存故障。可以更换内存之后，再启动交换机 看是否还有其他问题。
内存位置如下：
更换了内存之后，故障消除。光纤交换机可以正常启动。