Well you have to factor this in as well. CM600 is strictly D3 modem. CM1000 is a D3.1 modem as we know. With that said, I don't know if that customer was connected to D3.1 on the downstream. If so, he could have a bit of signal issue's, and with the modem connecting both D3/D3.1 channel's. The signal issue could be causing his problem. Signal might need to be better overall with the D3.1 modem. As the person mentioned getting a second CM1000. So very unlikely both modem's had problems. But very likely the customer has a signal issue, and the D3.1 modem not playing nice with it.
I just want to mention as well. I was using a CM600 myself before the CM1000. I still have my CM600, and both of these modems have run fine for me. But my signal level's are good to go. Also each modem will handle things a little different as well, as I have seen from previous D3 modems. At one point I know one modem they ended up having to push out a firmware update, because the modem didn't correctly work with adding up codeword's.
Well you have to factor this in as well. CM600 is strictly D3 modem. CM1000 is a D3.1 modem as we know. With that said, I don't know if that customer was connected to D3.1 on the downstream. If so, he could have a bit of signal issue's, and with the modem connecting both D3/D3.1 channel's. The signal issue could be causing his problem. Signal might need to be better overall with the D3.1 modem. As the person mentioned getting a second CM1000. So very unlikely both modem's had problems. But very likely the customer has a signal issue, and the D3.1 modem not playing nice with it.
I just want to mention as well. I was using a CM600 myself before the CM1000. I still have my CM600, and both of these modems have run fine for me. But my signal level's are good to go. Also each modem will handle things a little different as well, as I have seen from previous D3 modems. At one point I know one modem they ended up having to push out a firmware update, because the modem didn't correctly work with adding up codeword's.
Thanks for the helpful feedback! The theory about DOCSIS 3.0 not having such strict standards from a signal levels POV as 3.1 is possible (anyone here have anything concrete on that?) What are your signal levels?
My signal levels should be good enough overall, correct me if I am wrong... Worst upstream channel is 47.3 dB now Worst downstream channel is + 5.6 dB SNR around 41 Exception - I read that the downstream power levels of the channels should be within 2 dB of each other. Mine have a 2.7 dB fluctuation between best and worst channel.
Too bad the SB8200 is delayed again, otherwise I could compare the two before deciding which one to settle on. So I will probably return my CM1000 to Amazon (I believe they MAY ccept returns for 30 days - the CM1000 product page is, intentionally, confusing when it comes to return policy).
My signal levels should be good enough overall, correct me if I am wrong...
Worst upstream channel is 47.3 dB now Worst downstream channel is + 5.6 dB SNR around 41
Exception - I read that the downstream power levels of the channels should be within 2 dB of each other. Mine have a 2.7 dB fluctuation between best and worst channel.
That should be fine as, AFAIK, the variation between adjacent channels should be no more than 3 or 4 dB, but the level variation across all the channels should not be more than 10 dB.
My signal levels should be good enough overall, correct me if I am wrong...
Worst upstream channel is 47.3 dB now Worst downstream channel is + 5.6 dB SNR around 41
Exception - I read that the downstream power levels of the channels should be within 2 dB of each other. Mine have a 2.7 dB fluctuation between best and worst channel.
That should be fine as, AFAIK, the variation between adjacent channels should be no more than 3 or 4 dB, but the level variation across all the channels should not be more than 10 dB.
Thanks for the link and for confirming! Even more of a reason to return my CM1000 and wait for the SB8200. I am under the weather but may try to hook up my old SB6141 to see how if does with signal level and codeword errors after a few days.
Even more of a reason to return my CM1000 and wait for the SB8200.
What makes you think the 8200 will be any different?
CM1000 and the SB8200 use the same broadcom chipset.
They very well might not be different; that being said my SB6190 upstream levels were noticeably better than my CM1000. The frontends of the SB8200 and CM1000 could be different; in which case, as some have said, they could have different power levels. It won't hurt to try. I can always go back to the CM1000, although I would be surprised if the SB8200 were worse, or wait a year for 3.1 offerings to mature. Lots of options.
The biggest hassle is returning the CM1000 (ordered through Amazon) and activating back and forth between modems (my CM1000 required a phone call to Comcast, whereas the SB6190, which I returned, worked fine via the automated walled garden activation method).
Wonder if the levels thing has to do with the CMTS etc. My levels are better with the CM1000 than they were with my 6190. In fact I was able to remove the 6SVCS attenuater I had on the 6190 and my levels are excellent. Another thing I have noticed is no more T3 timeouts with the CM1000. With the 6190 I always had 3 or 4 a week.
Well i personally used a CM600 for well over 6 months without connection issues, before provisioning the CM1000 last friday. Its now been a week with the CM1000 online, and no T3's/T4's. Very little codeword's as well. I did run into something a bit weird earlier today though. I had a game downloading, which was near 60gb total. Near the end of the download, i noticed internet dropped out, was maybe 30 seconds in total. I pulled up modem page, and noticed all my downstream channel's, except the first channel had around 40-60 correctable codeword's per channel on avg, and near 200 uncorrectable codeword's per channel. I even pulled up the modem log, nothing logged except normal dhcp lease, that logs each day.
So again i think the CM1000 is fine, and likely signal issue causing some people's problem with this modem currently. However with what i seen earlier today, i do think there's a chance there might be a compatibility type issue going on between the CMTS, and the CM1000. If this is correct.. likely a future firmware update can resolve this, or a change at the CMTS level itself. Finally i want to mention, I'm using my CM1000 with my provider Cox, and they're using the .13 firmware build. Modem came with the .14 build which Comcast is using due to certain CMTS's not playing nice with the older build.
Well i personally used a CM600 for well over 6 months without connection issues, before provisioning the CM1000 last friday. Its now been a week with the CM1000 online, and no T3's/T4's. Very little codeword's as well. I did run into something a bit weird earlier today though. I had a game downloading, which was near 60gb total. Near the end of the download, i noticed internet dropped out, was maybe 30 seconds in total. I pulled up modem page, and noticed all my downstream channel's, except the first channel had around 40-60 correctable codeword's per channel on avg, and near 200 uncorrectable codeword's per channel. I even pulled up the modem log, nothing logged except normal dhcp lease, that logs each day.
So again i think the CM1000 is fine, and likely signal issue causing some people's problem with this modem currently. However with what i seen earlier today, i do think there's a chance there might be a compatibility type issue going on between the CMTS, and the CM1000. If this is correct.. likely a future firmware update can resolve this, or a change at the CMTS level itself. Finally i want to mention, I'm using my CM1000 with my provider Cox, and they're using the .13 firmware build. Modem came with the .14 build which Comcast is using due to certain CMTS's not playing nice with the older build.
Thanks for the informative feedback. Without real world reports, it is hard to know which issues are due to user signal levels or intermittent RF issues not visible in the signal levels themselves. I just checked my Sb6190 numbers screens hot and I only see a small number of codeword errors and zero uncorrected errors. Also worst upstream power, measured while a two way splitter was installed, is 48.5 dB below the 50 dB upstream threshold. My CM1000 was at 50.3 with the same exact wiring / splitter setup. Going to activate my old SB6141 for comparison purposes and then likely return my CM1000 for now. Prefer to be able to try the SB8200 for comparison purposes before locking myself into one D3.1 modem
May also call Comcast to check the signal coming into the house and seen if anything can be done to improve upstream power. Keep on mind the 47.5 I get now on my worst upstream channel is with the 2 way splitter in front of the cable modem removed, and using only a commscope 9 port passive 'amplifier' ( no splitters). Commscope passive amp reportedly has zero insertion loss. Not sure how much impact this has on upstream power, if any. We had Comcast in a number of times, when we were experiencing extremely annoying X1 issues, along with phone techs. . Took 3rd in house tech to finally install the commscope, which was at MY request.atill had issues at times with X1 after that, I f I recall correctly. Then switched to a cable card and Tivo 1 1/2 years ago (instead of X1 boxes) and all is great now (initial hiccups with OnDemand only, which have been fully resolved for a while now. So right now I just want the upstream power to be little better so I have a bit more breathing room as 47.5 dB is okay buy may /will creep up in summer when temperatures rise...
I see. Ok. Yeah that'd be a concern. I hope the firmware gets updated by you. Did you speak to odog and see if they have a plan or schedule on the rollout of the update?
Looked my CMTS up and it is a Cadant (owned by Arris now). Wonder which actual model it is...
Is one CMTS better than the other? That could account for varying experiences with the CM1000.
Perhaps the CM1000, with the current firmware at least, plays more nicely with the Cisco CMTS than with the Cadant... If so (and this is just speculation right now unless it turns out to officially be confirmed as an issue ), the CM1000 might need a firmware update as lilstone87 noted. Only time will tell...
Looked my CMTS up and it is a Cadant (owned by Arris now). Wonder which actual model it is...
Is one CMTS better than the other? That could account for varying experiences with the CM1000.
Perhaps the CM1000, with the current firmware at least, plays more nicely with the Cisco CMTS than with the Cadant...
Comcast has been deploying the Arris E6000 CER and Cisco cBR8 for their D3.1 upgrades. The MAC addresses on the Arris come back as Cadant for some reason.
Yeah, that's because ARRIS uses the same range of MAC addresses for their newer E6000 model as was used by Cadant.
I've been told that Comcast has very few C4s left on their network, so chances are that your CMTS is a actually a D3.1-ready E6000 model then.
I know. What I don't know why they're not using new ranges or why "Cadant" is still listed as a vendor in MAC address lookup databases. They should have been shifted to Arris as the vendor. For example, a MAC address for a Surfboard SB5101 00:16:b5 comes back as "Arris Group, Inc." Even the SB5101's USB MAC address 00:14 which also comes back as "Arris Group, Inc." This is also true for the SB6120. All of these were built before Arris.
I know. What I don't know why they're not using new ranges or why "Cadant" is still listed as a vendor in MAC address lookup databases.
That is not the way the IEEE operates. They follow their rules/processes/practices, all of which you can read (but it is likely more than you want to know about such a formal process). One of the rules is Arris is not even allowed to get additional ranges until they use (from memory) 95% of the range they already have, for example. Given the (slow) rate of utilization of CMTS MAC addresses they likely have some time go to before getting another.
That is only 1 CMTS and it's only showing the coax from the CMTS to the CMTS combining. It doesn't even show the coax from the CMTS combining to the individual node transmitter/receiver combining or from there to actual transmitter or receivers.
Man, what a beautiful machine, installation, and hub. Man I wish Comcast made videos like this. I'd love to see all that behind the scenes stuff. I wonder if Comcast's installations look as neat and organized as that.
Love the color coordinated zip ties and Velcro ties. Really a nice touch. Yay Arris polo shirts.
To top it off they should have done real cable lacing (I know, no one does that anymore, but it can be so gorgeous if done right; a skill long gone (and yes, it is not cost effective, but it shows real pride in workmanship when done well)).
Still trying to find a source for a (free?) Arris polo?
If you're a NASCAR fan, the Joe Gibbs Racing website (Arris sponsors one of their teams in the top two NASCAR series) has Arris polo shirts available. Not cheap, but they're the nice "sport" polo shirts with embroidered Arris logo and the number 19, the car number in the two NASCAR series that Arris supports JGR.
·