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Sephiroth · 26-08-2013, 06:26

I can see that the downstream channels vary between -3.1 and -1.5. Is there an attenuator fitted to your SH2? If so, what value?

If not, then your situation for adding Tivo is currently marginal unless the engineer runs a separate cable from the external Ominbox to Tivo (so avoiding an additional splitter).

What I have noticed, though, is a high correctable error count. When it's that high (although errors are corrected in flight), you have to ask what's going on. The SNR/RxMER is in range although lowish on Ch 2, yet the errors are fairly evenly spread across all channels.

So let's look at your installation. If it comes from the neighbour's garden/drive, does that mean that the circuit has a splitter at his home that goes left to him and right to you? If so, that's the culprit. You're already 170 m from the cabinet and you're sharing what little power there is. A repull (changing from RG6 as was then the standard to RG11) with separate feeds from the cabinet to each of you would fix that problem - can still come through the neighbour's garden!.

As regards the T3/T4 events, your picture showed something that happened overnight-ish. We haven't got a feel for what's happening during the day and evening. The events shown in the network log are consistent with the circuit breaking down. Is the upstream power level stable to within 1 dBmv?

26-08-2013, 06:26	#13
Sephiroth Wisdom & truth Join Date: Jul 2009 Location: RG41 Services: RG41: 1Gig VOLT Rutland: Gigaclear 400/400 Posts: 12,929	Re: Acceptable T3/T4 amounts I can see that the downstream channels vary between -3.1 and -1.5. Is there an attenuator fitted to your SH2? If so, what value? If not, then your situation for adding Tivo is currently marginal unless the engineer runs a separate cable from the external Ominbox to Tivo (so avoiding an additional splitter). What I have noticed, though, is a high correctable error count. When it's that high (although errors are corrected in flight), you have to ask what's going on. The SNR/RxMER is in range although lowish on Ch 2, yet the errors are fairly evenly spread across all channels. So let's look at your installation. If it comes from the neighbour's garden/drive, does that mean that the circuit has a splitter at his home that goes left to him and right to you? If so, that's the culprit. You're already 170 m from the cabinet and you're sharing what little power there is. A repull (changing from RG6 as was then the standard to RG11) with separate feeds from the cabinet to each of you would fix that problem - can still come through the neighbour's garden!. As regards the T3/T4 events, your picture showed something that happened overnight-ish. We haven't got a feel for what's happening during the day and evening. The events shown in the network log are consistent with the circuit breaking down. Is the upstream power level stable to within 1 dBmv? __________________ *Seph.* My advice is at your risk.