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TPS23751 识别问题

Other Parts Discussed in Thread: TPS23751

hi,TI:

目前我们在项目中使用PoE 控制芯片TPS23751,在应用中出现以下问题:

1. 在部分交换机上,首次插上网线时,5V输出正常后立马关闭15s,然后再次上电;

2. 如果将L2更换为0R电阻,则不会出现上电,下电问题;

什么原因会导致首次上电失败?协议?识别?