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

SpeedtestXfinity.jpg

Speedtest.jpg

Upstream.jpg

Downstream.jpg

Responses

Accepted Solution

tzr916

Contributor

•

188 Messages

4 years 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.

1 Attachment

Server speedtest.jpg

tzr916

Contributor

•

188 Messages

4 years 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 05:37

74010100

"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

Contributor

•

188 Messages

4 years 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 ID	Lock Status	Modulation	Frequency	Power	SNR/MER	Corrected	Uncorrectables
20	Locked	QAM256	507000000 Hz	2.3 dBmV	41.5 dB	0	0
17	Locked	QAM256	483000000 Hz	2.6 dBmV	41.6 dB	0	0
18	Locked	QAM256	489000000 Hz	2.6 dBmV	41.7 dB	0	0
19	Locked	QAM256	495000000 Hz	2.4 dBmV	41.7 dB	0	0
21	Locked	QAM256	513000000 Hz	2.4 dBmV	41.6 dB	0	0
22	Locked	QAM256	519000000 Hz	2.7 dBmV	41.9 dB	0	0
23	Locked	QAM256	525000000 Hz	2.8 dBmV	41.8 dB	0	0
24	Locked	QAM256	531000000 Hz	2.8 dBmV	41.9 dB	0	0
25	Locked	QAM256	537000000 Hz	2.4 dBmV	41.7 dB	0	0
26	Locked	QAM256	543000000 Hz	2.3 dBmV	41.7 dB	0	0
27	Locked	QAM256	549000000 Hz	2.4 dBmV	41.7 dB	0	0
28	Locked	QAM256	555000000 Hz	2.5 dBmV	41.8 dB	0	0
29	Locked	QAM256	561000000 Hz	2.3 dBmV	41.8 dB	0	0
30	Locked	QAM256	567000000 Hz	2.1 dBmV	41.8 dB	0	0
31	Locked	QAM256	573000000 Hz	1.9 dBmV	41.6 dB	0	0
32	Locked	QAM256	579000000 Hz	2.1 dBmV	41.8 dB	0	0
33	Locked	QAM256	585000000 Hz	1.9 dBmV	41.6 dB	0	0
34	Locked	QAM256	591000000 Hz	2.0 dBmV	41.6 dB	0	0
35	Locked	QAM256	597000000 Hz	1.8 dBmV	41.4 dB	0	0
36	Locked	QAM256	603000000 Hz	1.7 dBmV	41.4 dB	0	0
37	Locked	QAM256	609000000 Hz	1.8 dBmV	41.3 dB	0	0
38	Locked	QAM256	615000000 Hz	2.1 dBmV	41.5 dB	0	0
39	Locked	QAM256	621000000 Hz	2.3 dBmV	41.5 dB	0	0
40	Locked	QAM256	627000000 Hz	1.8 dBmV	41.1 dB	0	0
41	Locked	QAM256	633000000 Hz	1.1 dBmV	40.8 dB	0	0
42	Locked	QAM256	639000000 Hz	1.3 dBmV	40.9 dB	0	0
43	Locked	QAM256	645000000 Hz	2.4 dBmV	41.1 dB	0	0
44	Locked	QAM256	651000000 Hz	4.3 dBmV	41.7 dB	0	0
45	Locked	QAM256	657000000 Hz	4.6 dBmV	41.9 dB	0	0
46	Locked	QAM256	663000000 Hz	2.5 dBmV	41.4 dB	0	0
47	Locked	QAM256	669000000 Hz	1.2 dBmV	41.0 dB	0	0
48	Locked	Other	688000000 Hz	1.9 dBmV	35.5 dB	21545312	0

Upstream

Channel	Channel ID	Lock Status	US Channel Type	Frequency	Width	Power
1	3	Locked	SC-QAM Upstream	32300000 Hz	6400000 Hz	45.0 dBmV
2	1	Locked	SC-QAM Upstream	19300000 Hz	6400000 Hz	44.0 dBmV
3	2	Locked	SC-QAM Upstream	25700000 Hz	6400000 Hz	44.0 dBmV
4	4	Locked	SC-QAM Upstream	38700000 Hz	6400000 Hz	45.0 dBmV

Bendabutcha

Frequent Visitor

•

7 Messages

4 years 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

Contributor

•

188 Messages

4 years ago

Any instructions to get the configuration file version?

EG

Expert

•

110.1K Messages

4 years ago

@tzr916 wrote:
this is listed on the "product information" page:
Software Version AB01.01.009.51_080720_183.0A.NSH

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

tzr916

Contributor

•

188 Messages

4 years 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 Version

AB01.01.009.51_080720_183.0A.NSH

Bendabutcha

Frequent Visitor

•

7 Messages

4 years 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

Contributor

•

188 Messages

4 years 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

Contributor

•

188 Messages

4 years 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?

Bendabutcha

Frequent Visitor

•

7 Messages

4 years 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?

Bendabutcha

Frequent Visitor

•

7 Messages

4 years 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

Bendabutcha

Frequent Visitor

•

7 Messages

4 years ago

Channel ID	Lock Status	Modulation	Frequency	Power	SNR/MER	Corrected	Uncorrectables
5	Locked	QAM256	501000000 Hz	2.3 dBmV	39.4 dB	33	0
1	Locked	QAM256	477000000 Hz	3.4 dBmV	40.4 dB	64	0
2	Locked	QAM256	483000000 Hz	2.9 dBmV	39.9 dB	0	0
3	Locked	QAM256	489000000 Hz	2.1 dBmV	39.5 dB	33	6
4	Locked	QAM256	495000000 Hz	2.4 dBmV	39.5 dB	0	0
6	Locked	QAM256	507000000 Hz	2.3 dBmV	39.3 dB	7	0
7	Locked	QAM256	513000000 Hz	2.9 dBmV	39.8 dB	23	0
8	Locked	QAM256	519000000 Hz	2.7 dBmV	39.6 dB	0	0
9	Locked	QAM256	525000000 Hz	1.4 dBmV	38.9 dB	28	0
10	Locked	QAM256	531000000 Hz	1.2 dBmV	38.8 dB	10	0
11	Locked	QAM256	537000000 Hz	1.5 dBmV	38.9 dB	27	0
12	Locked	QAM256	543000000 Hz	1.0 dBmV	38.6 dB	10	0
13	Locked	QAM256	555000000 Hz	3.0 dBmV	39.7 dB	2	0
14	Locked	QAM256	561000000 Hz	2.5 dBmV	39.3 dB	0	0
15	Locked	QAM256	567000000 Hz	2.7 dBmV	39.3 dB	6	0
16	Locked	QAM256	573000000 Hz	3.1 dBmV	39.5 dB	5	0
17	Locked	QAM256	579000000 Hz	1.6 dBmV	38.4 dB	110	0
18	Locked	QAM256	585000000 Hz	1.3 dBmV	38.2 dB	81	27
19	Locked	QAM256	591000000 Hz	0.8 dBmV	37.9 dB	108	71
34	Locked	QAM256	453000000 Hz	3.8 dBmV	40.2 dB	84	0
35	Locked	QAM256	459000000 Hz	4.3 dBmV	40.6 dB	15	0
36	Locked	QAM256	465000000 Hz	3.0 dBmV	40.1 dB	63	2
37	Locked	QAM256	471000000 Hz	3.2 dBmV	40.4 dB	18	0
38	Locked	QAM256	423000000 Hz	6.6 dBmV	42.0 dB	30	0
39	Locked	QAM256	429000000 Hz	5.8 dBmV	41.5 dB	52	0
40	Locked	QAM256	435000000 Hz	5.8 dBmV	41.4 dB	16	0
41	Locked	QAM256	441000000 Hz	5.4 dBmV	41.1 dB	68	0
42	Locked	QAM256	399000000 Hz	5.4 dBmV	41.5 dB	64	0
43	Locked	QAM256	405000000 Hz	5.8 dBmV	41.5 dB	90	0
44	Locked	QAM256	411000000 Hz	5.9 dBmV	41.8 dB	62	0
45	Locked	QAM256	417000000 Hz	6.3 dBmV	42.1 dB	55	0
33	Locked	Other	690000000 Hz	-1.8 dBmV	32.0 dB	28403	63

Upstream Bonded Channels

Channel	Channel ID	Lock Status	US Channel Type	Frequency	Width	Power
1	2	Locked	SC-QAM	29200000 Hz	6400000 Hz	29.9 dBmV
2	1	Locked	SC-QAM	35600000 Hz	6400000 Hz	29.9 dBmV
3	3	Locked	SC-QAM	22800000 Hz	6400000 Hz	29.9 dBmV
4	4	Locked	SC-QAM	16400000 Hz	6400000 Hz	28.6 dBmV
5	5	Locked	SC-QAM	39600000 Hz	1600000 Hz	35.8 dBmV

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

tzr916

Contributor

•

188 Messages

4 years ago

Just unplugging the power cord for a minute to reboot.

NoNoBadPuppy

Problem Solver

•

548 Messages

4 years 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!

Your Home Network

tzr916

Arris SB8200 only getting 750-800Mbps (SOLVED)

tzr916

tzr916

tzr916

Bendabutcha

tzr916

EG

tzr916

Bendabutcha

tzr916

tzr916

Bendabutcha

Bendabutcha

Bendabutcha

tzr916

NoNoBadPuppy

New to the Community?