200M : Packet Loss issue.

[SirThomas]

Originally Posted by vm_tech

The 65 is 65mhz, which is where the return path spectrum currently ends. Going forward this will be increased.

Correct me if I'm wrong, but I don't think VM has plans to use Docsis 3.1 on the upstream for some time yet?

And just think - There must be thousands of people out there using them ATM!

As I said earlier in the post, I'm happy to post anyone an attenuator if they needed one. I have quite a few of the Technetix FPA's sat around doing nothing.

Tom

[heero_yuy]

Originally Posted by vm_tech

The 65 is 65mhz, which is where the return path spectrum currently ends. Going forward this will be increased.

My installation currently has a combined isolator / diplexer where the cable enters the property from the old analogue days when there was an FM radio take-off. Would this affect the return path when the higher frequencies (>65MHz) are used?

[vm_tech]

Originally Posted by SirThomas

Correct me if I'm wrong, but I don't think VM has plans to use Docsis 3.1 on the upstream for some time yet?

And just think - There must be thousands of people out there using them ATM!

As I said earlier in the post, I'm happy to post anyone an attenuator if they needed one. I have quite a few of the Technetix FPA's sat around doing nothing.

Tom

D3.1 upstream has been trialled. And even for more D3 upstream the same applies, the more spectrum the better.

Yea I would imagine there will be a hell of a lot of them out there. This was the advice quite a few years ago I guess for each less one they have out there it’s 1 less potential tech visit. The strategy could be totally different now, I haven’t worked around CPE for a fair few years, and I no longer work for VM.

---------- Post added at 10:55 ---------- Previous post was at 10:50 ----------

Originally Posted by heero_yuy

My installation currently has a combined isolator / diplexer where the cable enters the property from the old analogue days when there was an FM radio take-off. Would this affect the return path when the higher frequencies (>65MHz) are used?

The old FM isolators are replaced as a matter of course anyway. I believe the FM frequencies were in the low 100s MHz on the downstream, although that system was before my time so not sure. But I believe on the tv/bb side of the isolator it doesn’t separate frequencies like an FPA as the isolator acts as a fuse as such to prevent voltages in each direction

[ileikcaek]

Sorry all, I didn't have notifications of replies for this thread.

My power levels seem to be back in check now, The 10dB FPA is still in place. They were nearing -7dBmV the other week with it. It's interesting to read that these FPA's shouldn't really be used now and that thought did occur to me, I'm quite inquisitive and I've seen things relating to the higher frequencies in future.

It does seem like I have a situation where sometimes a 10dB FPA is good, but other times this is too much.

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 402750000 -1.5 38 256 qam 30
2 202750000 1.5 40 256 qam 9
3 210750000 1.4 38 256 qam 10
4 218750000 1.2 40 256 qam 11
5 226750000 1.2 40 256 qam 12
6 234750000 1 40 256 qam 13
7 242750000 0.9 38 256 qam 14
8 250750000 0.7 40 256 qam 15
9 258750000 0.5 40 256 qam 16
10 266750000 0.2 40 256 qam 17
11 274750000 0 38 256 qam 18
12 282750000 0.2 40 256 qam 19
13 290750000 0.2 38 256 qam 20
14 298750000 0.4 38 256 qam 21
15 306750000 0.2 40 256 qam 22
16 314750000 0.2 38 256 qam 23
17 322750000 0 40 256 qam 24
18 330750000 0 40 256 qam 25
19 370750000 -0.7 38 256 qam 26
20 378750000 -0.7 38 256 qam 27
21 386750000 -1 40 256 qam 28
22 394750000 -1.2 40 256 qam 29
23 410750000 -1.7 38 256 qam 31
24 418750000 -2.2 38 256 qam 32

Upstream still has a flapping channel but the T3's have settled now.

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 39400026 39.5 5120 64 qam 10
2 25800000 39.5 5120 32 qam 12
3 32600007 39.5 5120 64 qam 11
4 46199981 39.5 5120 64 qam 9

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 39400026 39.5 5120 64 qam 10
2 25800000 39.5 5120 64 qam 12
3 32600007 39.5 5120 64 qam 11
4 46199981 39.5 5120 64 qam 9

Still seeing some light packet loss (up to 1%) on my tbb graph but I'm unable to see where this is occurring. I've ran some checks including the pingplotter app and to various IP's. sometimes I see some packet loss on the first hop after my router (10.x.x.x ip being the cmts?) and sometimes on the second hop (brig-core-2b-xe-1122-0.network.virginmedia.net).

[spiderplant]

Originally Posted by ileikcaek

sometimes I see some packet loss on the first hop after my router (10.x.x.x ip being the cmts?) and sometimes on the second hop (brig-core-2b-xe-1122-0.network.virginmedia.net).

Where are you pinging to? I can test it from your CMTS.

[ileikcaek]

I was pinging pingbox1.thinkbroadband.com which is where their firebrick thing is but I was seeing a similar thing pinging cloudflare 1.1.1.1 when that thread was going and one of the links was down.



Probably not helpful at all and also not too bad right now, not that up to a single % is gonna be a huge problem.

My main question was about the power levels dropping so low in this case but they're back in check now.

My concern was that I was going to end up with packet loss getting worse like that issue in the first post back in june.

[General Maximus]

the power levels and stats you posted earlier are mint

[spiderplant]

I don't see any packet loss when pinging 80.249.99.164 and 1.1.1.1 from the CMTS