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tzr916
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Rousing Reactor

Regular Contributor

 • 

139 Messages

Mon, Nov 9, 2020 3:00 PM

Arris SB8200 only getting 750-800Mbps (SOLVED)

I made the jump to 1GB, purchased a new modem. No dropouts to speak of, just wondering if this SB8200 modem is capable of doing better than 800Mbps (one device hard wired direct)? Or if my signal levels need a bit of tweaking? See attachments/links.

 

NOTE: I have FOUR devices on my coax - Modem, 4K X1 box, and 2x cable card tuners. For the past 3 years they've all been running through a Comscope CSMAPDU9VPI, with terminators on the unused ports. Previously when trying a non-amplified splitter, my cable card Tv signals would be way out of spec, causing tv channels to pixellate and drop out.

 

Modem numbers:

Downstream Power = 9.1 - 12.1 dBmV

Downstream SNR = 40.9 - 41.8 dB

Upstream = 37 - 38 dBmV

 

Cable card tuner example number:

Power = 6.5 - 8.1 dBmV

SNR = 36.2 - 37.5 dB

 

https://postimg.cc/XrLGFd4z

https://postimg.cc/JsMHGPVX

https://postimg.cc/8FCFbcCP

https://postimg.cc/Czjfh9tY

 

 

4 Attachments

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Accepted Solution

tzr916

Regular Contributor

 • 

139 Messages

6 m ago

Well since my last post, my numbers went back up to around 700Mbps and have been pretty stable at that level. So my next problem was squeezing that last few hundred Mbps out of the service. I went back to a website that I have not visited in years and never really put much faith in:

https://www.speedguide.net/analyzer.php

Downloaded the optimizer, ran as administrator, backed up current settings, changed settings to optimal, rebooted PC, ran speed test and now getting 933Mbps! This PC is connected to a Gb switch which is connected to a wifi router which is connected to the modem.

 

tzr916

Regular Contributor

 • 

139 Messages

6 m ago

Channel ID's 41-48 seem to be the issue with all those errors. I also get tons of these items about Channel ID 48 in the modem log every day:

Date Time        Event ID    Event Level             Description

11/10/2020 05:37740101006"CM-STATUS message sent. Event Type Code: 16; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=zz:zz:zz:zz:zz:zz;CMTS-MAC=zz:zz:zz:zz:zz:zz;CM-QOS=1.1;CM-VER=3.1;"

 

NOTE: I edited those MAC addresses for privacy.

tzr916

Regular Contributor

 • 

139 Messages

6 m ago

Anyone have ideas now?

 

I just removed the Comscope CSMAPDU9VPI powered splitter and installed a non-powered BAMF 4-Way splitter. Ran speed tests with the same one device WIRED directly to the modem and speeds are worse. Can't even get 300Mbps now!

 

Here are the new modem signal levels:

                                   Downstream

Channel IDLock StatusModulationFrequencyPowerSNR/MERCorrectedUncorrectables
20LockedQAM256507000000 Hz2.3 dBmV41.5 dB00
17LockedQAM256483000000 Hz2.6 dBmV41.6 dB00
18LockedQAM256489000000 Hz2.6 dBmV41.7 dB00
19LockedQAM256495000000 Hz2.4 dBmV41.7 dB00
21LockedQAM256513000000 Hz2.4 dBmV41.6 dB00
22LockedQAM256519000000 Hz2.7 dBmV41.9 dB00
23LockedQAM256525000000 Hz2.8 dBmV41.8 dB00
24LockedQAM256531000000 Hz2.8 dBmV41.9 dB00
25LockedQAM256537000000 Hz2.4 dBmV41.7 dB00
26LockedQAM256543000000 Hz2.3 dBmV41.7 dB00
27LockedQAM256549000000 Hz2.4 dBmV41.7 dB00
28LockedQAM256555000000 Hz2.5 dBmV41.8 dB00
29LockedQAM256561000000 Hz2.3 dBmV41.8 dB00
30LockedQAM256567000000 Hz2.1 dBmV41.8 dB00
31LockedQAM256573000000 Hz1.9 dBmV41.6 dB00
32LockedQAM256579000000 Hz2.1 dBmV41.8 dB00
33LockedQAM256585000000 Hz1.9 dBmV41.6 dB00
34LockedQAM256591000000 Hz2.0 dBmV41.6 dB00
35LockedQAM256597000000 Hz1.8 dBmV41.4 dB00
36LockedQAM256603000000 Hz1.7 dBmV41.4 dB00
37LockedQAM256609000000 Hz1.8 dBmV41.3 dB00
38LockedQAM256615000000 Hz2.1 dBmV41.5 dB00
39LockedQAM256621000000 Hz2.3 dBmV41.5 dB00
40LockedQAM256627000000 Hz1.8 dBmV41.1 dB00
41LockedQAM256633000000 Hz1.1 dBmV40.8 dB00
42LockedQAM256639000000 Hz1.3 dBmV40.9 dB00
43LockedQAM256645000000 Hz2.4 dBmV41.1 dB00
44LockedQAM256651000000 Hz4.3 dBmV41.7 dB00
45LockedQAM256657000000 Hz4.6 dBmV41.9 dB00
46LockedQAM256663000000 Hz2.5 dBmV41.4 dB00
47LockedQAM256669000000 Hz1.2 dBmV41.0 dB00
48LockedOther688000000 Hz1.9 dBmV35.5 dB215453120

Upstream
ChannelChannel IDLock StatusUS Channel TypeFrequencyWidthPower
13LockedSC-QAM Upstream32300000 Hz6400000 Hz45.0 dBmV
21LockedSC-QAM Upstream19300000 Hz6400000 Hz44.0 dBmV
32LockedSC-QAM Upstream25700000 Hz6400000 Hz44.0 dBmV
44LockedSC-QAM Upstream38700000 Hz6400000 Hz45.0 dBmV


 

 

Frequent Visitor

 • 

7 Messages

4 m ago

I take it your sb8200 was able to download the software version  "d11_m_sb8200_gigabit_c01.cm"??? Mine keeps failing this process.  Max I get is about 300-400.  Any notice about the software version in your event log?

tzr916

Regular Contributor

 • 

139 Messages

4 m ago

Any instructions to get the configuration file version?

EG

Expert

 • 

86.6K Messages

4 m ago


@tzr916 wrote:

 this is listed on the "product information" page:

Software VersionAB01.01.009.51_080720_183.0A.NSH

FWIW, that is the firmware version, not the configuration file version.

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
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tzr916

Regular Contributor

 • 

139 Messages

4 m ago

The event log gets cleared each time the modem is rebooted, so I have no idea if that happened but this is listed on the "product information" page:

Software VersionAB01.01.009.51_080720_183.0A.NSH

Frequent Visitor

 • 

7 Messages

4 m ago

Has anyone gotten this router to accept the config file? I've got a tech coming out Tuesday but have no idea why. Fully explained the situation with the incompatible configuration file being sent to the sb8200. Maybe the tech knows some crazy work around, doubtful but we shall see. Guaranteed they say "you should just get Xfinity modem/router" 🤔🙈🙄😞
tzr916

Regular Contributor

 • 

139 Messages

4 m ago

The SB8200 is a modem, not a router. Yes, obviously I was able to get a config file downloaded/installed because I am getting very very close to the speed I am paying for.

-Did you ever call or chat with tech support? Did they tell you unplug the modem power cord at some point?

-did you try to Factory Reset the modem by holding the RESET button on the back for 10 seconds?

-Are you testing your speed with one PC connected directly to the modem with an ethernet cable? (usually requires rebooting the modem to make it sync to the PC)

-Did you try (install the software and run the optimizer) on the PC?

tzr916

Regular Contributor

 • 

139 Messages

4 m ago

I used comcast customer chat to activite my modem one time. And did many many reboots, even a factory reset... I never looked for that error message. I saw a channel error message repeated a lot, but after I removed a powered splitter all those went away. What do your signal levels look like?

Frequent Visitor

 • 

7 Messages

4 m ago

I've tried everything but "install the software and run the optimizer on pc". Sorry about verbage with router/modem. I meant modem. Did you have to manually install the modem software sent from Xfinity somehow? Or I just worked like it was supposed to and you never saw a "sw incompatible" message in the log?

Frequent Visitor

 • 

7 Messages

4 m ago

Guess I should try and reboot a ton.  I mean I have probably 5 times already but maybe some more couldn't hurt.  Did you just pull the power and plug back in? Reset from web page? Factory reset through paperclip hole? All the above? Appreciate all your help

Frequent Visitor

 • 

7 Messages

4 m ago

Channel IDLock StatusModulationFrequencyPowerSNR/MERCorrectedUncorrectables
5LockedQAM256501000000 Hz2.3 dBmV39.4 dB330
1LockedQAM256477000000 Hz3.4 dBmV40.4 dB640
2LockedQAM256483000000 Hz2.9 dBmV39.9 dB00
3LockedQAM256489000000 Hz2.1 dBmV39.5 dB336
4LockedQAM256495000000 Hz2.4 dBmV39.5 dB00
6LockedQAM256507000000 Hz2.3 dBmV39.3 dB70
7LockedQAM256513000000 Hz2.9 dBmV39.8 dB230
8LockedQAM256519000000 Hz2.7 dBmV39.6 dB00
9LockedQAM256525000000 Hz1.4 dBmV38.9 dB280
10LockedQAM256531000000 Hz1.2 dBmV38.8 dB100
11LockedQAM256537000000 Hz1.5 dBmV38.9 dB270
12LockedQAM256543000000 Hz1.0 dBmV38.6 dB100
13LockedQAM256555000000 Hz3.0 dBmV39.7 dB20
14LockedQAM256561000000 Hz2.5 dBmV39.3 dB00
15LockedQAM256567000000 Hz2.7 dBmV39.3 dB60
16LockedQAM256573000000 Hz3.1 dBmV39.5 dB50
17LockedQAM256579000000 Hz1.6 dBmV38.4 dB1100
18LockedQAM256585000000 Hz1.3 dBmV38.2 dB8127
19LockedQAM256591000000 Hz0.8 dBmV37.9 dB10871
34LockedQAM256453000000 Hz3.8 dBmV40.2 dB840
35LockedQAM256459000000 Hz4.3 dBmV40.6 dB150
36LockedQAM256465000000 Hz3.0 dBmV40.1 dB632
37LockedQAM256471000000 Hz3.2 dBmV40.4 dB180
38LockedQAM256423000000 Hz6.6 dBmV42.0 dB300
39LockedQAM256429000000 Hz5.8 dBmV41.5 dB520
40LockedQAM256435000000 Hz5.8 dBmV41.4 dB160
41LockedQAM256441000000 Hz5.4 dBmV41.1 dB680
42LockedQAM256399000000 Hz5.4 dBmV41.5 dB640
43LockedQAM256405000000 Hz5.8 dBmV41.5 dB900
44LockedQAM256411000000 Hz5.9 dBmV41.8 dB620
45LockedQAM256417000000 Hz6.3 dBmV42.1 dB550
33LockedOther690000000 Hz-1.8 dBmV32.0 dB2840363

 
Upstream Bonded Channels
ChannelChannel IDLock StatusUS Channel TypeFrequencyWidthPower
12LockedSC-QAM29200000 Hz6400000 Hz29.9 dBmV
21LockedSC-QAM35600000 Hz6400000 Hz29.9 dBmV
33LockedSC-QAM22800000 Hz6400000 Hz29.9 dBmV
44LockedSC-QAM16400000 Hz6400000 Hz28.6 dBmV
55LockedSC-QAM39600000 Hz1600000 Hz35.8 dBmV

 

Current System Time: Sun Jan 17 12:53:23 2021


 
 
tzr916

Regular Contributor

 • 

139 Messages

4 m ago

Just unplugging the power cord for a minute to reboot.

Contributor

 • 

48 Messages

4 m ago

Plese let me know what you meant when you posted "install the software and run the optimizer on pc"?  I have an SB8200, and am having some issues. 

 

Thanks!

 

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