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POE TPS23750 PD端 对有些标准POE交换机无法供电

Other Parts Discussed in Thread: TPS23750
大家好,现在有些POE交换机无法供电,请大家指点,多谢。附件是我们的原理图。
  我们测试的均是标准POE供电设备;
 我们测试的一个是国产的标准POE,没有问题,可以正常上电:
 在一个是PSE801:www.sdapo.com/.../PSE801FM.html
但是使用CS-1008-4PS时 不能正常上电:
tw.bid.yahoo.com/.../CERIO-智鼎【CS-1008-4PS】8埠-10-100Mbps-含4埠-POE-100103538989
请帮忙分析问题
04-POWER.pdf