SFP+ 10G Loopback

I want to ask

10G SFP+ Electrical Passive Loopback
Hot Pluggable, 0~5dB Internal Attenuation, 0~2.5W Power Consumption

Part Number	Data Rate	Internal Attenuation	Power Consumption	Temperature	Remark
FSPP-HX-XLB-xx-xx	10Gbps	0~5dB	0~2.5W	-40~85°C	SFP+ 10G-Loopback, I-Temp

SFP28 25G Loopback