请教，S6520X的一些接口问题，主要是速率和虚电缆测试

PC接Ten-GigabitEthernet一直up不起来，要手动把速率调到1000M全双工才能起来。

PC网卡信息如下

虚电缆测试，没有接线缆的端口能测出长度读数

[swh02klngc01f-Ten-GigabitEthernet2/0/21]vi
Cable status:
  Pair A length: 211 meters
  Pair B length: 213 meters
  Pair A state: Abnormal(open)
  Pair B state: Abnormal(open)
Pair Impedance mismatch: no
Pair skew: - ns
Pair swap: -
Pair polarity: -
Insertion loss: - db
Return loss: - db
Near-end crosstalk: - db
[swh02klngc01f-Ten-GigabitEthernet2/0/21]vi
Cable status:
  Pair A length: 39 meters
  Pair B length: 213 meters
  Pair A state: Abnormal(short)
  Pair B state: Abnormal(open)
Pair Impedance mismatch: no
Pair skew: - ns
Pair swap: -
Pair polarity: -
Insertion loss: - db
Return loss: - db
Near-end crosstalk: - db

然后另一个有接线的接口则是每次测速都能测出不同的长度

这些现象是正常吗？还是哪里有故障