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Posted by George Cole on October 1, 2006, 7:23 am
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my cable modem is split with a tv, seems fine to me. broadband speed checker
still gets me speeds apparently above average for my connection
is that possible?
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Posted by Ed Nielsen on October 1, 2006, 11:44 am
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If it ain't broke, don't fix it.
CIAO!
Ed N.
George Cole wrote:
> my cable modem is split with a tv, seems fine to me. broadband speed checker
> still gets me speeds apparently above average for my connection
>
> is that possible?
>
>
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Posted by Timothy Daniels on October 2, 2006, 6:53 am
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> my cable modem is split with a tv, seems fine to me.
> broadband speed checker still gets me speeds apparently
> above average for my connection
>
> is that possible?
1) How do you know what is average for your "connection"?
2) Well-designed comm equipment has a window of tolerance
for signal levels. Your signal levels apparently fall within
that window of tolerance.
3) Best Practices merely encourage optimal performance,
they don't guarantee it. Conversely, poor practices don't
guarantee failure.
*TimDaniels*
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Posted by Bill M. on September 12, 2006, 1:00 pm
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>With ~23dB of loss just through the splitters alone (not to mention the
>attenuation through the cables from the splitters to the outlets), it
>sounds like you sweet-talked someone into having your tap run out
>extremely hot just to keep your furthest outlet within FCC specs (or
>even acceptable). Cable modem has a rather high input level as well, I
>would imagine (unless it has been padded down).
My situation is similar to $Bill's. There's an 8-way splitter on the
outside of the house.
- One leg goes to a 2-way splitter for the front of the basement
- One leg goes to a 3-way splitter for the back half of the basement
- One leg goes to the office where it meets a 2-way splitter
- Off of that, one leg goes to the modem
and the other leg goes to a 3-way splitter.
- All other legs go straight to TV's
I don't even want to calculate the total losses, but the last cable
tech who was here to upgrade my modem raised an eyebrow and mumbled
something about a lot of outlets. :)
Modem power levels are good, at +8 downstream, 42 upstream, and 38dB
SNR. All TV's are clear, as well. I assume the signal is fairly hot
where it arrives at the house.
--
Bill
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Posted by $Bill on September 12, 2006, 1:13 pm
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> With ~23dB of loss just through the splitters alone (not to mention the
> attenuation through the cables from the splitters to the outlets), it
> sounds like you sweet-talked someone into having your tap run out
> extremely hot just to keep your furthest outlet within FCC specs (or
> even acceptable). Cable modem has a rather high input level as well, I
> would imagine (unless it has been padded down).
Not at all - there has never been an installer in the house. The only
visit was to add my modem when they became available. At that time,
they cleaned everything up and ran new cable to the house from the
underground, added a ground block and grounded to my breaker box,
replaced the splitter with a new 1-4 splitter and gave me 100' of RG6
to run to the modem. The TVs are all still running RG59.
Here's my reasonable, but not great, numbers for today at modem :
Tx Power 48.2 dBmV
Rx Power -7.0 dBmV
Downstream SNR 35.0 dB
Downstream MER 33.2 dB
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