dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
799
share rss forum feed

CTMustang
Premium
join:2007-09-10
France

How do these levels look?

Arris modem with boost+

RF Parameters
Downstream

DCID Freq Power SNR Modulation Octets Correcteds Uncorrectables
Downstream 1 34 609.00 MHz -5.62 dBmV 37.94 dB 256QAM 897048639 105 0
Downstream 2 33 603.00 MHz -5.34 dBmV 37.94 dB 256QAM 772784182 70 0
Downstream 3 35 615.00 MHz -6.14 dBmV 37.94 dB 256QAM 741815737 5324 0
Downstream 4 36 621.00 MHz -6.44 dBmV 37.36 dB 256QAM 853997431 2386 0
Downstream 5 37 627.00 MHz -6.10 dBmV 38.26 dB 256QAM 765832406 342 942
Downstream 6 38 633.00 MHz -6.10 dBmV 38.26 dB 256QAM 750272280 902 1023
Downstream 7 39 639.00 MHz -6.12 dBmV 37.94 dB 256QAM 724830798 1140 1085
Downstream 8 40 645.00 MHz -5.80 dBmV 38.26 dB 256QAM 796221016 21 0
Reset FEC Counters
Upstream

UCID Freq Power Channel Type Symbol Rate Modulation
Upstream 1 6 22.50 MHz 52.00 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM

An installer is telling me to put the modem closest to where the cable comes into the house. That'd be a pain and speeds seem ok. Just wondering if it'll really change anything. Doesn't make sense to me that it would.


jaa
Premium
join:2000-06-13
kudos:2
Reviews:
·Vonage
·Optimum Online

said by CTMustang:

speeds seem ok.

No point in fixing it until it's broke.
--
NOTHING justifies terrorism. We don't negotiate with terrorists. Those that support terrorists are terrorists.

frdrizzt

join:2008-05-03
Ronkonkoma, NY
kudos:1
Reviews:
·Optimum Online

said by jaa:

said by CTMustang:

speeds seem ok.

No point in fixing it until it's broke.

This. If you're getting full speeds, it's not like they'll get better moving it.

CTMustang
Premium
join:2007-09-10
France
reply to CTMustang

but are these good levels of signal?

I'm trying to verify if it's worth it to move stuff around... "If it works dont touch it" is no good on a saturday night when it goes down


andrewc2

join:2011-06-05
Matamoras, PA
Reviews:
·Optimum Online
reply to CTMustang




My line runs from the pole to a 2way splitter outside, 1 line runs inside to a 3way splitter and then theres a 15ft RG6 from their to my modem.

I have absolutely no issues with my speeds here.


jaa
Premium
join:2000-06-13
kudos:2
Reviews:
·Vonage
·Optimum Online
reply to CTMustang

»Optimum Online FAQ »What should my modem levels be?

said by CTMustang:

speeds seem ok.

said by CTMustang:

but are these good levels of signal?

Yes, they are good.

said by CTMustang:

"If it works dont touch it" is no good on a saturday night when it goes down

That is a different issue - are you having intermittent problems with your connection?

said by CTMustang:

An installer is telling me to put the modem closest to where the cable comes into the house.

Did the installer say why? Why didn't the installer do it? What did the installer say about the signals?
--
NOTHING justifies terrorism. We don't negotiate with terrorists. Those that support terrorists are terrorists.

Bob4
Account deleted

join:2012-07-22
New Jersey
reply to CTMustang

Your upstream power is a little on the high side, but within the acceptable range. Don't add another splitter, but everything is OK as is.



Dingo1

join:2013-01-27
reply to CTMustang

You are 1 split (3.5db) too deep for my liking. But like others said, if it aint broke...

If you were able to reconfig a splitter so that you can drop a 3.5 you would be golden.

3way (3.5db / 7db / 7db)

If you could get the leg of the outlet with the modem onto a 3.5 instead of a 7, you would end up with ~ -2 on the downstream and 48.5 on the upstream.

S/N is already at almost 38 on all downstreams and is more than perfect.

But thats just me. If speeds are fine, all of this is unnecessary.


cablewizzard

join:2009-06-14
Hicksville, NY
kudos:1

said by Dingo1:

You are 1 split (3.5db) too deep for my liking. But like others said, if it aint broke...

If you were able to reconfig a splitter so that you can drop a 3.5 you would be golden.

3way (3.5db / 7db / 7db)

If you could get the leg of the outlet with the modem onto a 3.5 instead of a 7, you would end up with ~ -2 on the downstream and 48.5 on the upstream.

S/N is already at almost 38 on all downstreams and is more than perfect.

But thats just me. If speeds are fine, all of this is unnecessary.

I second that, if he's not already on the -3.5 leg of a 3-way splitter.

Other than that, the signal strength is 100% within spec: there is no "better" and no reward for being anywhere on its scale, except for the very edge.

As the OOL FAQ was mentioned in this thread - I took a look, and didn't like what I saw there, and left the following feedback, summarizing what I've posted here on more than one occasion before:

====

The OOL plant build standard (enforced on the techs with an in-home test) is Receive Power from -10dBmB to +10dBmV, while transmit is up to +54dBmV (DOCSIS2 US limit for CV's 64QAM US channels) - there's no low Tx Power limit, but you're unlikely to ever encounter values lower than +30dBmV.

The FAQ statement of "closer to the center = better" is blatantly and 100% wrong : the only way to accomplish that for everybody is to move every house on that node segment into the exact same location (.

The correct statement is, and MUST be: DOCSIS will operate correctly and with acceptable error rates (BER/MER) and with no significant frame (and packet) loss anywhere in this range.

Marginal values near the very edge of the spec could become problematic at times, as signal levels vary by outdoor temperature. A +54dBmV transmit power is like a problem, as modems cap their Tx power per the spec - while the headend may receive less signal than spec'd (below 0 dBmV), but this cannot be seen from the modem side. The only way to ensure that the headend is not "under water" is when the Tx Power is = +53dBmV - that 1dB of margin is easily consumed by changing environmental conditions.