how to test FPGA PAC N3000 network port

for above connection ,if disconnect the fiber

[fpga@localhost ~]$ sudo fpgainfo phy

Board Management Controller, MAX10 NIOS FW version D.2.0.19

Board Management Controller, MAX10 Build version D.2.0.6

//****** PHY ******//

Object Id : 0xF500000

PCIe s:b:d.f : 0000:07:00.0

Device Id : 0x0b30

Numa Node : 0

Ports Num : 01

Bitstream Id : 0x23000010010309

Bitstream Version : 0.2.3

Pr Interface Id : 901dd697-ca79-4b05-b843-8138cefa2846

//****** PHY GROUP 0 ******//

Direction : Line side

Speed : 10 Gbps

Number of PHYs : 8

//****** PHY GROUP 1 ******//

Direction : Host side

Speed : 10 Gbps

Number of PHYs : 8

//****** Intel C827 Retimer ******//

Port0 10G : Down

Port1 10G : Down

Port2 10G : Down

Port3 10G : Down

Port4 10G : Down

Port5 10G : Up

Port6 10G : Up

Port7 10G : Down

Retimer A Version : 101c.1064

Retimer B Version : 101c.1064

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why Port5/Port6 always Up ?