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KoRnGtL15
Premium
join:2007-01-04
Grants Pass, OR

Motorola SB6141 modem signals.....

Click for full size
Current Signals
Wanted to know how my signals look? We dropped Charter telephone today and I removed the splitter. Since we have internet only now. So, its now going straight from the wall to the modem. I had to add a F Coupler at the end of cable from the wall. It was to short reaching my modem. Then just added another cable wire hooked up to that F Coupler then to modem.

Trendecide

join:2010-05-21
Belleville, IL

Thing there to watch is the signal to noise ratio, which should be between 30 and 40, 40 being the highest it can go, and it will dip during peek hours. You look good! 8 bonds are sexy!


KoRnGtL15
Premium
join:2007-01-04
Grants Pass, OR

Well that sounds a bit concerning. Should Charter come out and adjust signals?


Ryan818

join:2006-12-14
Medford, OR

My downstream SNR has been around 36-38 dB for the last four years. I haven't had any connection issues or loss of the modem because of it. I am sure you won't have any problems given your current levels. No need to have Charter roll a truck in my opinion.



lineofsight

join:2003-01-03
East Saint Louis, IL
Reviews:
·PHONE POWER

1 edit
reply to KoRnGtL15

If it is working OK, I don't see the point in worrying about it. If you want to help it out some, get rid of the extra joint in the cable you added. Go buy a piece of RG6 that will reach all the way. That will be good for 2db.

My 6141 only bonds at 4 channels right now. My downstream SNR's are basically 37 and my power levels for that are 6dBmV.
Upstream my power level is 44 and everything works as expected.

»Adelphia High Speed Internet »FAQ: Acceptable cable modem signal levels.


passerby

join:2013-03-22
Monroe, MI
reply to KoRnGtL15

There's zero need for concern about your signal levels. All are within Charter's spec.


passerby

join:2013-03-22
Monroe, MI
reply to Trendecide

said by Trendecide:

Thing there to watch is the signal to noise ratio, which should be between 30 and 40, 40 being the highest it can go, and it will dip during peek hours. You look good! 8 bonds are sexy!

A modem should have an SNR > 33db, not 30-33, and can indicate a downstream SNR >40. Mine does routinely.

KoRnGtL15
Premium
join:2007-01-04
Grants Pass, OR
reply to lineofsight

I was just curious. I do have the longer cable that reaches to the modem. Using that f coupler. But, do you mean if I wanted it to reach instead of using that adapter. I would have to directly go into the wall right and change it?

said by lineofsight:

If it is working OK, I don't see the point in worrying about it. If you want to help it out some, get rid of the extra joint in the cable you added. Go buy a piece of RG6 that will reach all the way. That will be good for 2db.

My 6141 only bonds at 4 channels right now. My downstream SNR's are basically 37 and my power levels for that are 6dBmV.
Upstream my power level is 44 and everything works as expected.

»Adelphia High Speed Internet »FAQ: Acceptable cable modem signal levels.



lineofsight

join:2003-01-03
East Saint Louis, IL

If you have a RG6 cable that will be long enough to go from the wall to the modem, this will give you a lower signal loss.
Every time you introduce a connector into the line, you lose some signal.


KoRnGtL15
Premium
join:2007-01-04
Grants Pass, OR

Oh okay. I got confused for a second. The cable coming out of the wall is certainly on the short side and cant reach. I don't want to pull or yank on it hard. Since I am not sure how far it will pull out from the wall. Gah. I wish it would reach for a direct connection instead of having to use that f coupler and extra piece of cable.


KoRnGtL15
Premium
join:2007-01-04
Grants Pass, OR
reply to KoRnGtL15

Click for full size
Direct Wall Signals
Thanks again guys for the replies. Appreciate it. I said screw and went for it. I managed to get a connection directly from wall to modem. No f coupler or splitter involved. All I had to do was relocate the modem. I did not think my power adapter was long enough. It worked out great. Signals directly from wall.


lineofsight

join:2003-01-03
East Saint Louis, IL

1 edit
reply to KoRnGtL15

Usually there is a connector mounted on a wall plate. I would leave it as is.


whoaru99

join:2003-12-17
reply to KoRnGtL15

Stop worrying. You don't have a problem either with or without and additional F-connector/coupler.



TheTechGuru

join:2004-03-25
TEXAS
Reviews:
·HughesNet Satell..
·WesTex Connect
reply to KoRnGtL15

Looks good to me. I prefer the power level to be between +5 and -5 though.




Optimum ranges for DOCSIS 3.0:
SNR: 32dB-50dB
Down stream Power Level: -5 to 5
Upstream Power: 32dBmV-50dBmV
--
CompTIA Network+ Certified

passerby

join:2013-03-22
Monroe, MI

said by TheTechGuru:

Optimum ranges for DOCSIS 3.0:
SNR: 32dB-50dB
Down stream Power Level: -5 to 5
Upstream Power: 32dBmV-50dBmV

Don't know where you got that, but Charter's spec is:
Downstream level -12 to 12 dBmV
Downstream SNR >33 dB
Upstream Level 35-50 dBmv

On Downstream SNR, anything below 34 dB is not "optimal" and I've never seen a upper limit. Did you accidentally use the same values for upstream level and DS SNR?


TheTechGuru

join:2004-03-25
TEXAS
Reviews:
·HughesNet Satell..
·WesTex Connect

said by passerby:

Don't know where you got that, but Charter's spec is:
Downstream level -12 to 12 dBmV
Downstream SNR >33 dB
Upstream Level 35-50 dBmv

On Downstream SNR, anything below 34 dB is not "optimal" and I've never seen a upper limit. Did you accidentally use the same values for upstream level and DS SNR?

»www.satelliteguys.us/threads/282···le-Modem

Second post.
--
CompTIA Network+ Certified

passerby

join:2013-03-22
Monroe, MI

Bad info posted there. Signal specifications have less to do with the DOCSIS version and more to do with the modulation used.



TheTechGuru

join:2004-03-25
TEXAS
Reviews:
·HughesNet Satell..
·WesTex Connect

Well here is an official document from a similar cable company.






--
CompTIA Network+ Certified

passerby

join:2013-03-22
Monroe, MI

Being that this is a Charter forum, their field specifications take precedence over another MSO's. No Charter tech in their right mind would leave a modem transmitting over 50. Not to say that it won't work but it leaves very little room for signal/attenuation changes in the system.


krommulent

join:2010-04-07
Reviews:
·Charter
reply to KoRnGtL15

you would be asked about it if you did. your signals are within spec the concern i have is when you say cables barreled together i immediately picture 1 of them being crappy and loose fittings. a quality rg6 cable with tight connections should serve you fine.



TheTechGuru

join:2004-03-25
TEXAS
Reviews:
·HughesNet Satell..
·WesTex Connect
reply to KoRnGtL15

said by KoRnGtL15:

Oh okay. I got confused for a second. The cable coming out of the wall is certainly on the short side and cant reach. I don't want to pull or yank on it hard. Since I am not sure how far it will pull out from the wall. Gah. I wish it would reach for a direct connection instead of having to use that f coupler and extra piece of cable.

I have FIVE barrels between my modem and the tap.
One at the wall jack, another in the attic, another on the side of the house, another at the bottom of the pole where it changes from orange direct burial cable to black regular cable to go up the pole then another one to allow a pigtail to connect to a trap.
--
CompTIA Network+ Certified

krommulent

join:2010-04-07
reply to KoRnGtL15

cool story bro.