1 Gigabit Internet and SB8200 Modem

[hgundecha]

I recently upgraded my Internet to the 1 Gig Speed. While I was using the comcast modem, I was getting download speed more than 950 Mbps, but the moment I switched to my personal modem (Arris SB8200, bought new from BestBuy), I never got speeds more than 450 Mbps. I have already contacted the customer care and worked with the agent to try and fix the issue. The agent has recommended a technician visit, but I concern is nothing has changed from the wiring point of view, I have just replaced the comcast modem with my own modem. 

Modem Make/Model: Arris SB8200

Speed Tier: Gigabit Internet Tier

Signal Levels:

Startup Procedure
Procedure	Status	Comment
Acquire Downstream Channel	651000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Configuration File	OK
Security	Enabled	BPI+
DOCSIS Network Access Enabled	Allowed

Downstream Bonded Channels
Channel ID	Lock Status	Modulation	Frequency	Power	SNR/MER	Corrected	Uncorrectables
31	Locked	QAM256	651000000 Hz	0.3 dBmV	40.5 dB	0	0
1	Locked	QAM256	465000000 Hz	3.0 dBmV	41.9 dB	0	0
2	Locked	QAM256	471000000 Hz	2.8 dBmV	41.9 dB	0	0
3	Locked	QAM256	477000000 Hz	2.6 dBmV	41.9 dB	0	0
4	Locked	QAM256	483000000 Hz	1.6 dBmV	41.4 dB	0	0
5	Locked	QAM256	489000000 Hz	1.7 dBmV	41.5 dB	0	0
6	Locked	QAM256	495000000 Hz	1.8 dBmV	41.6 dB	0	0
7	Locked	QAM256	507000000 Hz	2.2 dBmV	41.8 dB	0	0
8	Locked	QAM256	513000000 Hz	1.4 dBmV	41.4 dB	0	0
9	Locked	QAM256	519000000 Hz	1.2 dBmV	41.1 dB	0	0
10	Locked	QAM256	525000000 Hz	1.8 dBmV	41.6 dB	0	0
11	Locked	QAM256	531000000 Hz	2.0 dBmV	41.4 dB	0	0
12	Locked	QAM256	537000000 Hz	2.5 dBmV	41.6 dB	0	0
13	Locked	QAM256	543000000 Hz	2.7 dBmV	41.8 dB	0	0
14	Locked	QAM256	549000000 Hz	2.2 dBmV	41.4 dB	0	0
15	Locked	QAM256	555000000 Hz	2.6 dBmV	41.6 dB	0	0
16	Locked	QAM256	561000000 Hz	2.1 dBmV	41.1 dB	0	0
17	Locked	QAM256	567000000 Hz	2.1 dBmV	40.9 dB	0	0
18	Locked	QAM256	573000000 Hz	2.9 dBmV	41.3 dB	0	0
19	Locked	QAM256	579000000 Hz	3.0 dBmV	41.2 dB	0	0
20	Locked	QAM256	585000000 Hz	2.9 dBmV	41.3 dB	0	0
21	Locked	QAM256	591000000 Hz	2.1 dBmV	41.1 dB	0	0
22	Locked	QAM256	597000000 Hz	1.6 dBmV	40.8 dB	0	0
23	Locked	QAM256	603000000 Hz	2.0 dBmV	40.8 dB	0	0
24	Locked	QAM256	609000000 Hz	1.6 dBmV	40.8 dB	0	0
25	Locked	QAM256	615000000 Hz	1.2 dBmV	40.3 dB	0	0
26	Locked	QAM256	621000000 Hz	1.3 dBmV	40.3 dB	0	0
27	Locked	QAM256	627000000 Hz	0.9 dBmV	40.4 dB	0	0
28	Locked	QAM256	633000000 Hz	0.5 dBmV	40.2 dB	0	0
29	Locked	QAM256	639000000 Hz	0.3 dBmV	40.5 dB	0	0
30	Locked	QAM256	645000000 Hz	-0.2 dBmV	40.1 dB	0	0
33	Locked	Other	705000000 Hz	3.7 dBmV	39.0 dB	546650	0

Upstream Bonded Channels
Channel	Channel ID	Lock Status	US Channel Type	Frequency	Width	Power
1	31	Locked	SC-QAM	30300000 Hz	6400000 Hz	41.3 dBmV
2	29	Locked	SC-QAM	17300000 Hz	6400000 Hz	40.8 dBmV
3	30	Locked	SC-QAM	23700000 Hz	6400000 Hz	41.0 dBmV
4	32	Locked	SC-QAM	36700000 Hz	6400000 Hz	41.3 dBmV

Current System Time: Sun Feb 18 00:44:50 2018

Modem Event Logs:

Time	Priority	Description
1-1-1970, 0:0:41	Notice(6)	"Honoring MDD; IP provisioning mode = IPv6"
1-1-1970, 0:0:38	Critical(3)	"No Ranging Response received - T3 time-out;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:01:5c:6d:32:75;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:0:33	Critical(3)	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
2-18-2018, 0:9:29	Critical(3)	"Resetting the cable modem due to docsDevResetNow"
1-1-1970, 0:0:37	Critical(3)	"No Ranging Response received - T3 time-out;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:01:5c:6d:32:75;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:0:33	Critical(3)	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
2-18-2018, 0:4:42	Critical(3)	"Resetting the cable modem due to docsDevResetNow"
2-17-2018, 10:46:0	Critical(3)	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:01:5c:6d:32:75;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:0:38	Critical(3)	"No Ranging Response received - T3 time-out;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:01:5c:6d:32:75;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:0:33	Critical(3)	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
2-14-2018, 23:22:7	Critical(3)	"Resetting the cable modem due to docsDevResetNow"
2-14-2018, 18:59:0	Critical(3)	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:01:5c:6d:32:75;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:0:37	Critical(3)	"No Ranging Response received - T3 time-out;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:01:5c:6d:32:75;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:0:33	Critical(3)	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:0:36	Critical(3)	"No Ranging Response received - T3 time-out;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:01:5c:6d:32:75;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:0:33	Critical(3)	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
2-5-2018, 23:5:24	Critical(3)	"Resetting the cable modem due to docsDevResetNow"
1-1-1970, 0:0:33	Critical(3)	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:2:3	Critical(3)	"No Ranging Response received - T3 time-out;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:01:5c:6d:32:75;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:1:56	Critical(3)	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:1:55	Critical(3)	"SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:1:55	Critical(3)	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:0:28	Critical(3)	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
1-1-1970, 0:0:33	Critical(3)	"Telnet user logged in from IP address 192.168.100.10."
1-1-1970, 0:0:29	Critical(3)	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:da:f9:2b:44:8d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"

[Nerdburg]

Your signals are fine. You see the speed issue even when directly connected to the modem via ethernet? I've seen several complaints about your exact issue with that modem. I suspect there may be a firmware issue with it. Is returning it a possibility for you? 

[CXF]

I got rid of the SB8200 for a Motorola MB8600.  It was faster for me and even cheaper.

[Deaofly]

You do know that Arris owns Motorola right? LOL But the problem is Arris and Motorola are both trash modems. Go buy a Netgear, you won't regret it.

[Nerdburg]

---

@Deaofly wrote:
You do know that Arris owns Motorola right? LOL But the problem is Arris and Motorola are both trash modems. Go buy a Netgear, you won't regret it.

---

The MB8600 is actually made by Zoom, a well-respected manufacturer. 

[CXF]

---

@Nerdburg nerdburg wrote:

---

@Deaofly Deaofly wrote:
You do know that Arris owns Motorola right? LOL But the problem is Arris and Motorola are both trash modems. Go buy a Netgear, you won't regret it.

---

The MB8600 is actually made by Zoom, a well-respected manufacturer. 

---

You can't expect to take those that LOL serisouly.

http://arris.force.com/consumers/articles/General_FAQs/Motorola-Zoom-ARRIS-Branding-Name

https://motorolanetwork.com/

[ArrisTuska]

I just checked you have the latest code but you have a little noise on the ODFM and upstream; a tech visit maybe the best to get that looked at..  But what is odd to me is my modem has more noise in the Plant then yours does and I am getting 945..  I guess I will need to ping some people to get that looked at as well..

[spongebob2004]

I just recently returned my Netgear CM1000 for the Motorola MB 8600 and have no regrets. You have made an excellent choice. 

[Vito5850]

i' mhaving the same problem.   all my devices wires are achieving 500 mb/s max with the arris sb8200.   i had two comcast techs out, each had their gig speed tester which read i was getting over 940 down on his device.  my devices still only reached 500.  

  do you think its the modem? I would hate to return this one and have the samem issue with the netgear cm1000.

[drosman · Accepted solution]

After beating my head against the wall for several weeks, exchanged the Arris SB8200 for the Netgear CM100 and problem solved. Full speed ahead!

[nailgun]

I only have 60MBS Performance but I wanted the fastest modem I could get in case I wanted to upgrade.

I chose an MB8600. It worked great for 1 day. I got 64MB down and 15 up. Then I could not connect. I had "unknown network" and no "valid IP configuration". I switched to SB5101u DOCSIS 2.0 and it works but I get 34MB down and 6 up.

So a 3.1 modem is not overkill but I need something other than a SB8600. I see netgear, arris and Motorola are all called junk here. 

Maybe I got a lemon. Maybe all the negativity here is because of lemmons.

[DrewMcG]

I'm spitballing here, but the fact that the OP showed bonding tables with 32 bonded8200) download chanels indicates that he was in Docis 3.0 mode, not Docis 3.1 (which is 2X2 on the S, right?

So in other words, his SB8200 was acting as a glofified Docis 3.0 modem, not a 3.1 modem, correct?

Obviously, the vast majority of SB8200 must not behave this way. I suspect a hardware problem with that unit or an anomoly with the signal that threw off the SB8200 for his unique installation.

[EG]

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@DrewMcG wrote:

I'm spitballing here, but the fact that the OP showed bonding tables with 32 bonded8200) download chanels indicates that he was in Docis 3.0 mode, not Docis 3.1 (which is 2X2 on the S, right?

So in other words, his SB8200 was acting as a glofified Docis 3.0 modem, not a 3.1 modem, correct?

Obviously, the vast majority of SB8200 must not behave this way. I suspect a hardware problem with that unit or an anomoly with the signal that threw off the SB8200 for his unique installation.

---

The downstream channel number 33 marked "Other" is the DOCSIS 3.1 OFDM channel.

[Ilovepizzaaa]

How are you able to tell with all those numbers? I can not find a guide that explains what these values are meant to mean.