sb6120

sb6120
Links: home · search · speed test · login · more ·

Links: Reply New Topic
Forums » Comcast » Comcast HSI » sb6120

tonix @ 3rd Nov 09:15PM:
sb6120

just got my sb6120 to work. comcast said i have to return the my emta to get the sb6120 to be activated. so i had to find a way around it and i got it to work. tell me if my signals level look good

Downstream Bonding Channel Value
Channel ID 69
Frequency 597000000 Hz
Signal to Noise Ratio 40 dB
Downstream Modulation QAM256
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
power level 15 dBmV

Upstream Bonding Channel Value
Channel ID 7
Frequency 36500000 Hz
Ranging Service ID 6835
Symbol Rate 2.560 Msym/sec
Power Level 48 dBmV
Upstream Modulation [3] QPSK
[2] 16QAM

Ranging Status Success
reply

beachintech @ 3rd Nov 09:20PM:
Re: sb6120

Do you have an amp connected to your line? Downstream is way too hot (high). If you do you most likely don't need it at all.
--
Tech at the Beach.
I speak for myself, not my employer.
reply

tonix @ 3rd Nov 09:25PM:
Re: sb6120

i think there is 2 splits in the acetic. the s6120 is so fast. makes the arris look like garbage
reply

Cjaiceman @ 3rd Nov 09:35PM:
Re: sb6120

Does your eMTA have a power reducer on it between the cable line and the modem? If so put it on your SB6120, your downstream power (+15dBm) is way to high, as user=beachintech said. Your downstream power should be between -10dBm and +10dBm. You might want to check those splitters and make sure one of them is not an amplifier.
--
Duct tape is like The Force – it has a light side and a dark side, and it binds the Universe together
reply

tonix @ 3rd Nov 09:47PM:
Re: sb6120

last time comcast came he check the power level and it was 12 and he didn't do any thing so what should i do. right now it is 14
reply

tonix @ 3rd Nov 10:20PM:
Re: sb6120

here is a picture of the splitters

beachintech @ 3rd Nov 10:44PM:
Re: sb6120

Can you describe what order they are in and where the modem is connected in line? a 14 on the receive with a 48 upstream is odd without an amp in the picture.
--
Tech at the Beach.
I speak for myself, not my employer.
reply

tonix @ 3rd Nov 10:56PM:
Re: sb6120

i think it is on the last splitter in the picture either the white or black cable. the rest of the cables are for t.v.
reply

EG @ 3rd Nov 11:20PM:
Re: sb6120

I see a DC tap in there.
reply

tonix @ 3rd Nov 11:28PM:
Re: sb6120

is the tap a good thing or bad thing
reply

EG @ 3rd Nov 11:35PM:
Re: sb6120

said by tonix :

is the tap a good thing or bad thing

That depends on where it is in the configuration. If the modem is connected to the "out" port it doesn't need to be. On a DC tap the out port is a very low loss one.

Some info on taps:

»Cable Modems and Wiring Issues

In the second picture their is a two way splitter with nothing connected to one of the ports. What is that splitter for ? It also seems that the unused port is uncapped.

A Comcast tech should really reconfigure the coax wiring for you.
reply

beachintech @ 4th Nov 07:02AM:
Re: sb6120

said by tonix :

i think it is on the last splitter in the picture either the white or black cable. the rest of the cables are for t.v.

You need to have a tech come out and adjust and balance out your home.
--
Tech at the Beach.
I speak for myself, not my employer.
reply

tonix @ 4th Nov 08:17AM:
Re: sb6120

knowing comcast they will say your speeds are better than they were before with the old modem so whats the problem. can i jjust buy like a 8 way splitter to solve my problem if not i will call them.
reply

madden2k5 @ 4th Nov 10:36AM:
Re: sb6120

the bigger the splitter the more db loss you will get. The modem should be running off the first splitter once the line hits your house, and it should be either on a 2-way or 3-way(make sure its on the 3.5db loss).
reply

EG @ 4th Nov 10:44AM:
Re: sb6120

said by madden2k5 :

The modem should be running off the first splitter once the line hits your house, and it should be either on a 2-way or 3-way(make sure its on the 3.5db loss).

This is not true for everyone everytime. It depends on ones particular individual environment. His downstream is already too hot. His incoming power seems to be too much right off the drop. He needs more attenuation in the downstream, not less. The upstream power level must always be factored in as well. This should be properly balanced by a tech.
reply

tonix @ 4th Nov 05:22PM:
Re: sb6120

i will call a tech and see how it goes but i already know they are going to tell me bull. because they didn't want to activate the sb6120 because of the emta. i will give it a try and call them
reply

tonix @ 6th Nov 09:05PM:
Re: sb6120

so today i called comcast cause my upstream powerlevel went all the way up to 58 dbmv and now it is back at 49. so here is what the guy told me. i said my downstream power level is too high and it makes my youtube video stop loading so he transfers me to microsoft wtf
reply

EG @ 6th Nov 11:31PM:
Re: sb6120

Maybe you should post your concern over in the Comcast Direct Forum. You may get better results.
reply

beachintech @ 7th Nov 07:50AM:
Re: sb6120

said by tonix :

so today i called comcast cause my upstream powerlevel went all the way up to 58 dbmv and now it is back at 49. so here is what the guy told me. i said my downstream power level is too high and it makes my youtube video stop loading so he transfers me to microsoft wtf

You don't need to say that. Just tell them the problem and you want a tech to come out to your house and fix it. You can mention your signal is fluctuating, but really if your service isn't working, a tech will be sent to your house. Everything else is not necessary. The tech that comes out to your house will see the signal level and adjust as necessary for your area.
--
Tech at the Beach.
I speak for myself, not my employer.
reply