Cable Forum - View Single Post - Superhub +11dBmV DS

Sephiroth · 05-10-2011, 20:09

Because your downstream power has gone up by c. 5 dBmv and your upstream has fallen by c. 5 dBmv, it seems that all they did was to move your tap point - perhaps from 29 dB attenuation down to 22 dB. The should have put a 10 dB FPA on your modem to compensate for the high DS power.

But they won't have cured the root cause of hig upstream power. I imagine you're close to the cabinet, in which case your upstream power should have been much lower - closer to or below 40 dBmv.

So, how far from the street cab are you and what do you think the network bods did? Your power levels are too high and can affect performance (e.g. crosstalk). The DS levels will rise fuurther as it gets colder.

05-10-2011, 20:09	#2
Sephiroth Wisdom & truth Join Date: Jul 2009 Location: RG41 Services: RG41: 1Gig VOLT Rutland: Gigaclear 400/400 Posts: 12,357	Re: +11dBmV DS - Power level(s) Because your downstream power has gone up by c. 5 dBmv and your upstream has fallen by c. 5 dBmv, it seems that all they did was to move your tap point - perhaps from 29 dB attenuation down to 22 dB. The should have put a 10 dB FPA on your modem to compensate for the high DS power. But they won't have cured the root cause of hig upstream power. I imagine you're close to the cabinet, in which case your upstream power should have been much lower - closer to or below 40 dBmv. So, how far from the street cab are you and what do you think the network bods did? Your power levels are too high and can affect performance (e.g. crosstalk). The DS levels will rise fuurther as it gets colder. __________________ *Seph.* My advice is at your risk.