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Old 01-09-2012, 09:49   #6
kwikbreaks
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Join Date: May 2010
Services: Plusnet FTTC, FoxSat HDR for TV, Vonage VOIP.
Posts: 2,082
kwikbreaks has reached the bronze age
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Re: Decreasing Power Levels

Quote:
Originally Posted by General Maximus View Post
I think they do down a few db as the weather gets colder as well.
Downstream power will rise as temperature falls as the falls because the copper resistivity decreases with temperature. It won't be anywhere near the reported change though. Upstream could fall with temperature as that's a measure of how much juice your modem needs to produce to hit the target noise margin which does decrease as the temperature and resistivity fall.

If it was a gradual decline it might indicate something slowly degrading but it it was one or more step changes it's probably just network changes. When I got a Superhub to replace my VMNG300 I found that the downstream levels were reported as being much lower so I left out the FP attenuator which I had with the VMNG300.

---------- Post added at 08:49 ---------- Previous post was at 08:46 ----------

Quote:
Originally Posted by General Maximus View Post
yeah, I dont know where my cab is but it definitely isnt anywhere near my house
Could it be underground? I think all cabs have to be within a couple of hundred meters - no doubt one of the VM installers can comment on that.

As an aside mines about 100m away and a car has just hit the wall inches from it so I had a lucky break there even if the car driver didn't.
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