Thanks for your reply. Perhaps it's because this GX20 was a demo unit. I had problems with the post speeds being just 10mbps when I first set it up a couple of years ago. Cisco would not repair/replace it as it was a demo unit, so I bought another GX20 which I later replaced with a GX50. So this GX20 has been gathering dust for a while, but I recently set it up at my apartment in Jakarta. Surprisingly, it's now working perfectly apart from this small issue. It will soon go into the roofspace, so the LED issue will be irrelevent.
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