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4 upstream channel bonding - post here
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Old 27-08-2017, 23:49   #1
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4 upstream channel bonding - post here

As the title says, post here if you have 4 upstream channels bonded on your modem, alongside where in the country you are and upstream stats if you can.

It's a project in progress on the VM network so it'd be interesting to see just where they are.

It's a precursor to higher upstream speeds having the 4 channel bonding done.
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Old 28-08-2017, 11:20   #2
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Re: 4 upstream channel bonding - post here

4 x 16QAM, Area20 Wirral
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Old 28-08-2017, 18:22   #3
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Re: 4 upstream channel bonding - post here

Still only two here (Nottingham).
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Old 28-08-2017, 20:48   #4
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Re: 4 upstream channel bonding - post here

Only two here as well. Surrey. I'm on VIVID 350 as well so they are not giving higher speed customers priority.
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Old 28-08-2017, 21:48   #5
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Re: 4 upstream channel bonding - post here

Quote:
Originally Posted by Cromulent View Post
Only two here as well. Surrey. I'm on VIVID 350 as well so they are not giving higher speed customers priority.
The tier the customers on won't have any bearing on how many upstreams are in use. It's all about the equipment out in the field. Some areas have 65mhz upstreams some have 42mhz. The 42mhz areas on only physically fit 3 upstreams, so the modems will run on 2 of the 3. The 42mhz areas will be upgraded in due course though. And the areas running older kit, as the future plan will be to go above 65mhz
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Old 29-08-2017, 05:20   #6
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Re: 4 upstream channel bonding - post here

Still 2 here.
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Old 29-08-2017, 10:31   #7
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Re: 4 upstream channel bonding - post here

I was rather hoping people with 4 channel bonding would post, not people who are still not on it, and the first post makes clear what I had in mind.

This was a thread modeled after the ones here.

http://www.dslreports.com/forum/comcast

Looks like it's a bit late for that. Oh well.
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Old 29-08-2017, 11:14   #8
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Re: 4 upstream channel bonding - post here

Can someone explain the benefits of moving to 4 upstream channels (from 2)? Many thanks!
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Old 29-08-2017, 11:24   #9
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Re: 4 upstream channel bonding - post here

Quote:
Originally Posted by ianch99 View Post
Can someone explain the benefits of moving to 4 upstream channels (from 2)? Many thanks!
Read the first post.
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Old 29-08-2017, 13:20   #10
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Re: 4 upstream channel bonding - post here

Manchester ( Baguley) area 20.
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Old 29-08-2017, 14:32   #11
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Re: 4 upstream channel bonding - post here

Quote:
Originally Posted by Ignitionnet View Post
I was rather hoping people with 4 channel bonding would post, not people who are still not on it, and the first post makes clear what I had in mind.
Your stated aim was to see how far the project had progressed.
Quote:
It's a project in progress on the VM network so it'd be interesting to see just where they are.
Therefore knowing it has not reached an area seems as useful as knowing it has, otherwise you have no idea one way or the other for that given area.
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Old 29-08-2017, 16:24   #12
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Re: 4 upstream channel bonding - post here

4 bonded upstreams wolverhampton
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Old 29-08-2017, 17:32   #13
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Re: 4 upstream channel bonding - post here

Quote:
Originally Posted by pip08456 View Post
Read the first post.
Thanks for your helpful reply.

The reason I asked was when I was researching this to better understand things, I came across this on the Wikipedia page:

https://en.wikipedia.org/wiki/DOCSIS

Quote:
Throughput

The first three versions of the DOCSIS standard support a downstream throughput with 256-QAM of up to 42.88 Mbit/s per 6 MHz channel (approximately 38 Mbit/s after overhead), or 55.62 Mbit/s per 8 MHz channel for EuroDOCSIS (approximately 50 Mbit/s after overhead). The upstream throughput possible is 30.72 Mbit/s per 6.4 MHz channel (approximately 27 Mbit/s after overhead), or 10.24 Mbit/s per 3.2 MHz channel (approximately 9 Mbit/s after overhead).
so I was curious if the 2 channels we have now can, in the real world, be pushed to get nearer these theoretical limits (2 channels ==> 54Mbps). The only reason I went to 350/20 is for the upload and so if our CMTS is stuck on 2 channels for the time being, would this preclude higher uploads even though, on first reading, the DOCSIS page hints at more.
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Old 29-08-2017, 17:44   #14
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Re: 4 upstream channel bonding - post here

Quote:
Originally Posted by ianch99 View Post
Thanks for your helpful reply.

The reason I asked was when I was researching this to better understand things, I came across this on the Wikipedia page:

https://en.wikipedia.org/wiki/DOCSIS



so I was curious if the 2 channels we have now can, in the real world, be pushed to get nearer these theoretical limits (2 channels ==> 54Mbps). The only reason I went to 350/20 is for the upload and so if our CMTS is stuck on 2 channels for the time being, would this preclude higher uploads even though, on first reading, the DOCSIS page hints at more.
More channels = more speed.

Though having more channels doesn't mean you'll get more speed, it does mean Virgin can push more speed down the line.
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Old 31-08-2017, 20:47   #15
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Re: 4 upstream channel bonding - post here

RG41

Upstream bonded channels
Channel ID Frequency(Hz) Mode Power
(dBmV) Modulation Channel Bandwidth(Hz) Symbol Rate (ksps)
6 39400000 ATDMA 45.3 64 qam 6400000 5120
8 25800000 ATDMA 45.3 16 qam 6400000 5120
7 32600000 ATDMA 45.3 64 qam 6400000 5120
5 46200000 ATDMA 45.3 64 qam 6400000 5120

When I use the SNMP browser call on the Hub 3, my mini-slot size has dropped from 4 to 2.

---------- Post added at 19:47 ---------- Previous post was at 19:40 ----------

Quote:
Originally Posted by ianch99 View Post
Thanks for your helpful reply.

The reason I asked was when I was researching this to better understand things, I came across this on the Wikipedia page:

https://en.wikipedia.org/wiki/DOCSIS



so I was curious if the 2 channels we have now can, in the real world, be pushed to get nearer these theoretical limits (2 channels ==> 54Mbps). The only reason I went to 350/20 is for the upload and so if our CMTS is stuck on 2 channels for the time being, would this preclude higher uploads even though, on first reading, the DOCSIS page hints at more.
You would get the 20 meg if the upstream contention is low.
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