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[Signals] 8.5+ dBm variance across 8 downstream channelsIs this amount of variance normal for downstream channels? Using a Arris TM822G. I know the upstream dB is horrible and on the verge of being out of spec. In the winter months I can get 4 upstream channels bonded, summer months I might get 4 but the modem drops it back to 1 after a few days. Internet, Voice and Cable are all working perfectly and at rated speed, no packet loss ect. Main line only goes through 1 2-way splitter that go to cable box and modem. I don't wanna be "that guy" that calls a tech out just for single levels. Since speed increases are coming once I get up to 105/20 I feel that 1 channel for upstream is getting pretty close to the overhead and theoretical limit for 1 bonded channel. Thoughts & opinions? |
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 mackey
Premium Member
join:2007-08-20 |
mackey
Premium Member
2014-May-24 9:24 pm
That's bad enough to call it in. They should roll a truck no prob with those signals.
/M |
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So I did end up calling a tech out. Everything was fine on the internal wiring, he did some work on the pole. Getting a lot more stable singles now and able to bond 4 upstream channels no problem. |
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Anno
Anon
2014-Jun-9 10:37 am
Your area must have 16 channels because your DS frequency are not the same between the two shots.
That said the higher ones do generally have more spread. Mine is about 5dB between channel 1 and 8 and is completely normal in the design of my neighborhood. |
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 JeepMattStreaming Tech Manager
Premium Member
join:2001-12-28
Seattle, WA |
to Navitron
As the other poster mentioned - yep - appears your area of Seattle is set up for 16x4 internet channels. |
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to Navitron
FYI My node had the same problem (in the Ballard area), and eventually it degraded down to 1 channel w/ no bonding. I rebooted my modem and now all I get are the higher-level channels (16, 15, 14, 13) bonded, and their levels are stable. |
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to JeepMatt
Are you sure about 16x4? To me it just looks like the ordering of the channels in the GUI by the Arris Firmware are a little bugged. If you order it by DCID all the channels line up 555-597MHz with 6MHz per channel. Doesn't make sense to implement 16 channel bonding without even any hardware out that can support it.  |
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 DocDrewRF Medic
Premium Member
join:2009-01-28
dv streaming
Technicolor TC4400
ARRIS TG1672
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DocDrew
Premium Member
2014-Jun-9 5:42 pm
said by Navitron:Are you sure about 16x4? To me it just looks like the ordering of the channels in the GUI by the Arris Firmware are a little bugged. If you order it by DCID all the channels line up 555-597MHz with 6MHz per channel.
Doesn't make sense to implement 16 channel bonding without even any hardware out that can support it. Your first screen shot is 8 channels from 603-646 Mhz. There are several modems out that support 16 channels. The Arris SB6183, DG1670, and TG1672 being 3 of them. |
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 netcool
Premium Member
join:2008-11-05
Englewood, CO |
to Navitron
said by Navitron:Doesn't make sense to implement 16 channel bonding without even any hardware out that can support it. Sure it does. D3 modems can always be load balanced across the available bonding groups. In this case you could have x1 16 channel bonding group, x2 8 channel bonding groups and x4 4 channel bonding groups. And as DocDrew pointed out there are more and more modems coming out with support for 16 channels. |
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to DocDrew
Interesting. As far as 16x4 being "out" 1 guy selling SB6183 on ebay or having to do back ally deals with a guy who knows a guy that works at Arris. To be able to get your hands on one would hardly call them being "out." :P |
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 train_wreckslow this bird down
join:2013-10-04
Antioch, TN |
well some of them may be rented out by comcast only, and not for sale at retail.
i know some people are getting a Cisco DPC3008/DPC3939 rented out, and they're both 16 down.
moar channels! |
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 EGThe wings of love
Premium Member
join:2006-11-18
Union, NJ |
EG
Premium Member
2014-Jun-9 6:41 pm
said by train_wreck:i know some people are getting a Cisco DPC3008/DPC3939 rented out, and they're both 16 down. FWIW, the 3008 has only 8 downstream channel capability. |
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 Tobin
join:2003-09-21
Burlingame, CA
1 edit |
to Navitron
Yes, the DPC3008 uses same chipset as the Zoom 5341J.
Can I assume having 16+ channels to pick from does not necessarily mean he is on a system that will actually allow him to bond 16 channels? I mean, even 10+ years ago before Comcast even went D2, my modem would pick any number of channels to use. |
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train_wreckslow this bird down
join:2013-10-04
Antioch, TN |
to EG
my b |
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Anno to Navitron
Anon
2014-Jun-11 4:55 pm
to Navitron
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EGThe wings of love
Premium Member
join:2006-11-18
Union, NJ |
EG
Premium Member
2014-Jun-11 5:25 pm
said by Anno : If you have 16 or 24 channels on the node, the system overall has more bandwidth available and thus they can either give you faster speeds, or it clears up congestion as has more room to balance better. Yes, up to the technical limitation of the total number of multiple bonded channels. The congestion alleviation / load balancing part is indeed so ! |
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to netcool
It appears the OP's system has 16 DS channels and his modem grabs eight contiguous ones. In his 5/24 screenshot, he's got them from 603 to 645 MHz (labeled DCID 201-208) and in his 6/9 screenshot, he's got them from 555 to 597 MHz (DCID 193-200). My system also has 16 DS channels (from 561 to 651 MHz) but the modem seems to grab them more randomly. If they're ever contiguous, it's just chance. |
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