Noise Margin and Line Attenuation

Noise Margin (ยิ่งมากยิ่งดี)
5db or below =bad, no sync/intermittent sync
8db-13db = average - and no sync issues
14db-22db = very good
23db-28db = excellent
29db-35db = rare, can throw a rock at co/remote

Line Attenuation (ยิ่งน้อยยิ่งดี 0=node)
ต่ำกว่า 20 = rare, great copper lines, close to co/remote
20-30 = excellent
30-40 = very good
40-60 = average
60-65 = poor
65 and above will have issues