The homeplug are the passthrough version. Aztech 500Mbps.
Currently I'm getting green signal so should be good just that the speed don't make up.
there are two types 500Mbps passthrough version as well. one model has 2 ports one model has only 1. the 2 ports version is actually limited to 100Mbps per port..
it is highly likely that yours is the 1 port version. have you tried to move around your electrical devices. like not plug them beside your homeplug.
i still advice you to view the actual link rate in the aztech software..
taken from their website, the light indicator are as follows:
Green is best: Connection rate is more than 105Mbps
Amber is better: Connection rate is between 40 to 105Mbps
Red is Good: Connection rate is less than 40Mbps
Means 105Mbps is also considered green.
Edit: Also, can verify that both ends are using Cat 6 cables?
N56u <- cat 6 -> homeplug1 <--> homeplug 2 <- cat 6 -> computer