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Byrus1

join:2013-08-27

Channel bonding?

Can a docsis 3.0 modem bond downstream and upstream channels in a docsis 2.0 area?

Oedipus

join:2005-05-09
kudos:1
No.

Byrus1

join:2013-08-27
reply to Byrus1
Thank you. Can bad signal strength effect how many channels a modem bonds with?


Kasoah

join:2013-08-20
Merced, CA
yeah if the signals are really bad


andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
reply to Byrus1
The limit on bonding will mainly be on upstream signals. For 1 channel, the limit is 57-58dB. For 2-channel, it's 54-55dB. For 3 or more channels, it's 51-52dB.

Byrus1

join:2013-08-27
reply to Byrus1
Last question. Does the speed tier your on have a effect on how many channels your modem bonds with?


andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
No.


Johkal
Cool Cat
Premium,MVM
join:2002-11-13
Happy Valley
kudos:10
reply to andyross
Those limits are high. More realistic ranges would be limits before you see possible issues.

Opinion:
1 channel: 54-55 dBmV
2 channels: 52-53 dBmV
3 channels: 50-51 dBmV
4 channels: 48-49 dBmV
--
In God we trust; all others bring data!


Byrus1

join:2013-08-27
reply to Byrus1
Click for full size
I'm suppose to have 50/5, but shaperprobe only shows my max line speed at 17456. Does anyone have any ideas?


Johkal
Cool Cat
Premium,MVM
join:2002-11-13
Happy Valley
kudos:10

1 edit
What do you get from a few sites from here: »speedtest.comcast.net/

I know shaperprobe is normally the "tell-all", but it doesn't report accurately for me. I get the same results as you posted, whereas normal test sites report accurately. Just wondering. You tier is also 50/10 if you subscribe to Blast

**Note: your SNR is on the low end of preferable.
You tier is also 50/10 if you subscribe to Blast

You may want to reconfigure any splitters & check all cable/cable ends to raise your downstream & lower your upstream proportionally.

Ref: »Comcast High Speed Internet FAQ »What should my Signal Levels be?


andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
reply to Johkal
said by Johkal:

Those limits are high. More realistic ranges would be limits before you see possible issues.

Opinion:
1 channel: 54-55 dBmV
2 channels: 52-53 dBmV
3 channels: 50-51 dBmV
4 channels: 48-49 dBmV

The numbers I gave are the maximum from the DOCSIS specs. Ideally, you'd want to stay 4-5 below them.

Byrus1

join:2013-08-27
reply to Byrus1
Comcast speed test shows 25 down 30 up.

Byrus1

join:2013-08-27
reply to Johkal
said by Johkal:

What do you get from a few sites from here: »speedtest.comcast.net/

I know shaperprobe is normally the "tell-all", but it doesn't report accurately for me. I get the same results as you posted, whereas normal test sites report accurately. Just wondering. You tier is also 50/10 if you subscribe to Blast

**Note: your SNR is on the low end of preferable.
You tier is also 50/10 if you subscribe to Blast

You may want to reconfigure any splitters & check all cable/cable ends to raise your downstream & lower your upstream proportionally.

Ref: »Comcast High Speed Internet FAQ »What should my Signal Levels be?

Comcast speed test shows around 25 for download 30 for upload.


Johkal
Cool Cat
Premium,MVM
join:2002-11-13
Happy Valley
kudos:10
30 for upload? I would guess you mean 3?

Can you post the test or screen of it?


Randomer

@comcast.net
reply to Byrus1
You are likely not getting the full 50 because you only have two downstream channels and your SNR & power levels are low. Are you using high quality splitters and cabling?


Johkal
Cool Cat
Premium,MVM
join:2002-11-13
Happy Valley
kudos:10
More likely if he shows 25/3 it looks like wrong provisioning and less a signal issue limiting speed.

Byrus1

join:2013-08-27
reply to Byrus1
Click for full size
Click for full size
ok, here's what I'm getting tonight. But yesterday I was getting 30 up.


Johkal
Cool Cat
Premium,MVM
join:2002-11-13
Happy Valley
kudos:10
Wow, even if that isn't reporting correctly; nearly symmetrical speed. Awesome!

Any way, if that is correct, you have a wacky config file. You'll have to call in and get them to re-provision your modem to correct it.

Byrus1

join:2013-08-27
reply to Byrus1
That's what I've tried to tell them, but they keep saying my modem shows the correct config file. It's almost impossible to get someone that knows what their doing. Does it sound right to have 3 upstream channels and only 2 downstream? Does Comcast still use 2 downstream channels in any area?


Johkal
Cool Cat
Premium,MVM
join:2002-11-13
Happy Valley
kudos:10
If you can get 3 Upstream channels, you should have at least 4 Downstream channels. This doesn't look like anything on your end.


Kasoah

join:2013-08-20
Merced, CA
his downstream snr is kind of bad


Johkal
Cool Cat
Premium,MVM
join:2002-11-13
Happy Valley
kudos:10
said by Kasoah:

his downstream snr is kind of bad

As I posted earlier: "**Note: your SNR is on the low end of preferable."

Ref: About »Re: Channel bonding?
--
In God we trust; all others bring data!