200M : RG41 5: 4 upstream channels

[General Maximus]

all hail Cisco

[Sephiroth]

Originally Posted by General Maximus

all hail Cisco

It seems so, mon General.

[Ignitionnet]

How is this trial running for you Sir Sephiroth?

I noted discussion on DOCSIS 3.1 in this thread. Just FYI Comhem in Sweden have released 1Gb down, 100Mb up via EuroDoCSIS 3.0.

As I've said a few times still a fair bit of mileage in 3.0

---------- Post added at 17:35 ---------- Previous post was at 17:21 ----------

[General Maximus]

given that they are trying to get everyone on to shub3's for 200mbits+ it looks like they are trying to keep %channel utilisation down so I imagine they won't want to go above 400mbits without releasing a 32 channel modem and buy that time we would surely be ready for 3.1. Is there any info on which gateway that speed test was done on?

[Ignitionnet]

Sure. It was one of these and used 24 downstream and 6 upstream channels.

[Sephiroth]

Originally Posted by Ignitionnet

How is this trial running for you Sir Sephiroth?

I noted discussion on DOCSIS 3.1 in this thread. Just FYI Comhem in Sweden have released 1Gb down, 100Mb up via EuroDoCSIS 3.0.

As I've said a few times still a fair bit of mileage in 3.0

---------- Post added at 17:35 ---------- Previous post was at 17:21 ----------

It's the usual VM thing. Dead silence. For a few weeks now I've had one channel (highest frequency) at 64QAM

Upstream bonded channels
Channel ID Frequency(Hz) Mode Power
(dBmV) Modulation Channel Bandwidth(Hz) Symbol Rate (ksps)
6 39400000 ATDMA 44.5 16 qam 6400000 5120
8 25800000 ATDMA 44.5 16 qam 6400000 5120
7 32600000 ATDMA 44.5 16 qam 6400000 5120
5 46200000 ATDMA 44.5 64 qam 6400000 5120

[General Maximus]

cool, Netgear again which means it has the potential to come in our direction

[Ignitionnet]

It's just a 24x8 DoCSIS 3 gateway, same as the SH 3.

---------- Post added at 19:22 ---------- Previous post was at 19:21 ----------

Originally Posted by Sephiroth

It's the usual VM thing. Dead silence. For a few weeks now I've had one channel (highest frequency) at 64QAM

Let's hope they can get it cleaned up and get 64QAM possible across the board. The power is spot on, though, which is good.

[Sephiroth]

Originally Posted by Ignitionnet

It's just a 24x8 DoCSIS 3 gateway, same as the SH 3.

---------- Post added at 19:22 ---------- Previous post was at 19:21 ----------



Let's hope they can get it cleaned up and get 64QAM possible across the board. The power is spot on, though, which is good.

When they did that, the downstream power jumped from -3.5dBmv to +3.5 dBmv. (Upstreasm stayed the same-ish). Ordinarily I'd have said they'd changed the amp in my street cabinet - except that they clearly haven't because it was an overnight reset when that happened.

[Kushan]

I've had 1x QAM64 and 1xQAM16 for weeks now:



Is that a valid/normal configuration or does it indicate a problem somewhere? I mean speeds are fine, so I've not been bothered, it's just unusual to see two channels on different QAM's without there being an issue.

[Ignitionnet]

It's a legitimate configuration, but could also indicate problems.

Could be ingress in the 50.5MHz -> 56.9MHz range, there's an amateur radio channel there, or could be using some 16QAM and some 64QAM channels intentionally to reduce load on the upstream optics.

---------- Post added at 14:10 ---------- Previous post was at 14:07 ----------

Originally Posted by Sephiroth

When they did that, the downstream power jumped from -3.5dBmv to +3.5 dBmv. (Upstreasm stayed the same-ish). Ordinarily I'd have said they'd changed the amp in my street cabinet - except that they clearly haven't because it was an overnight reset when that happened.

Depending on what you're connected to they may have changed some kit within the hub to connect you to a new Edge QAM and return path line card. Hosted on same CMTS so retaining existing DHCP scope, just CCAP equipment change.

EDIT: Not entirely related but I saw a guy mentioning 20 downstream channels on the Cisco 10k. Yes, possible, but improbable. To go past 10 channels requires installation of a 3 Gb SPA, and as far as I know these have only been used to go to 12 channels to permit release of Homeworks+. VM aren't doing a big investment in these, purchasing the bare minimum in fact, as they are getting shot of the 10ks as part of migration to CCAP. These are being used as an interim solution while issues like power, space and cooling are sorted to make room for the CCAP kit and higher density, dedicated M-CMTS.

People on 20 channels are on E6k or cBR-8 unless there were a very strange set of circumstances that required a very non-standard configuration.

[Synthetic]

Originally Posted by Kushan

I've had 1x QAM64 and 1xQAM16 for weeks now:

---snip---

Is that a valid/normal configuration or does it indicate a problem somewhere? I mean speeds are fine, so I've not been bothered, it's just unusual to see two channels on different QAM's without there being an issue.

I had that earlier in the year, got VM out and they confirmed it was a fault affected 300 other properties.... we were experiencing drop outs too though.

However since the fix (only took 2 days!) both went back to 64 and have stayed like that since.

[JordanTheToaster]

Originally Posted by Ignitionnet

It's a legitimate configuration, but could also indicate problems.

Could be ingress in the 50.5MHz -> 56.9MHz range, there's an amateur radio channel there, or could be using some 16QAM and some 64QAM channels intentionally to reduce load on the upstream optics.

---------- Post added at 14:10 ---------- Previous post was at 14:07 ----------



Depending on what you're connected to they may have changed some kit within the hub to connect you to a new Edge QAM and return path line card. Hosted on same CMTS so retaining existing DHCP scope, just CCAP equipment change.

EDIT: Not entirely related but I saw a guy mentioning 20 downstream channels on the Cisco 10k. Yes, possible, but improbable. To go past 10 channels requires installation of a 3 Gb SPA, and as far as I know these have only been used to go to 12 channels to permit release of Homeworks+. VM aren't doing a big investment in these, purchasing the bare minimum in fact, as they are getting shot of the 10ks as part of migration to CCAP. These are being used as an interim solution while issues like power, space and cooling are sorted to make room for the CCAP kit and higher density, dedicated M-CMTS.

People on 20 channels are on E6k or cBR-8 unless there were a very strange set of circumstances that required a very non-standard configuration.

I was wondering why i had 20 channels now I know.

[Sephiroth]

In keeping with my topic, I now report for everyone's delectation that 3 of my upstreams are now 64QAM and one is 16QAM.

You'll see the slight upstream noise from the BQM. Just to remind, this is a Hub 3 in modem mode to an ASUS RT-AC68U.

[vm_tech]

Originally Posted by JordanTheToaster

I was wondering why i had 20 channels now I know.

Your area was moved over to E6000 a few weeks back