Thomas Kernen wrote:
Does some have any guidance as to how much S/N margin Swisscom requires for their BBCS VDSL loops. I have a case where the S/N margin in 22dB on the downstream and it surprises me the line doesn't train at a higher rate (current rate is 13264kbps).
The S/N margin is inverse proportional to the link speed. You have 22dB at 13Mb but only 5dB at 30Mb. This is usually a symptom of some cabling problem. You should also check the number of CRC errors you have on the line. VDSL2 is extremely sensitive to in-house wiring. Make sure you run the cable directly from the Swisscom UP to your VDSL modem. If necessary put a fresh U72 cable just for VSDL. Always separate VDSL from any SDSL on the same quad (U72 is not twisted pair but twisted quad).