How to enable Gb Speed

I just upgraded plan to Gb internet. Modem is Arris 6190. Still running at old ≤300. Do I have to do anything to the device to get speed up? I thought this was taken care of using DOCSIS by their side.

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brintonh

Contributor

•

33 Messages

4 years ago

Same issue. Windows 10, LAN on MB (10/100/1000). MoCA filter and splitter where cable enters house - one leg to video distribution box, second leg directly to my modem. Had 200 MB plan and was getting around 180 MB. Upgraded plan to 1200 MB and modem (Arris SB8200, DOCSIS 3.1), Cat 6 directly from desktop directly to modem port just to test - would "spike" speed to around 700 MB then immediately throttle down to 320 MB - 380 MB. Reset and reprovisioned modem twice. No change. Had Comcast Tech out who checked speed at pole (1200 MB), speed at tap for house (1200 MB), speed at modem (1200 MB) with "excellent power levels). Add SB8200 in the mix and speed drops to 320-380 MB. Tech said "Speeds based on our equipment. SB8200 might not hold full boot file. Try our Xfi modem." Did that - same speeds. Would spike to around 600 MB then drop back to 320-380 MB. Hmmm, ok. Try another gig speed modem. Got a Netgear CM1200 yesterday. Set up with Cat 6 direct from desktop to modem. Testing wee hours of the AM and get a little better but not much - certainly not 1 GB.

Using speedtest.net app in W10 rather than browser test - Browser test is consistently 50-100 MB slower. Upload is fine. Modem reports:

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	627000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	honorMdd(4)

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	32	627000000 Hz	7.8 dBmV	41.2 dB	0	0
2	Locked	QAM256	1	435000000 Hz	6.3 dBmV	40.6 dB	0	0
3	Locked	QAM256	2	441000000 Hz	6.1 dBmV	40.5 dB	0	0
4	Locked	QAM256	3	447000000 Hz	6.3 dBmV	40.5 dB	0	0
5	Locked	QAM256	4	453000000 Hz	5.9 dBmV	40.5 dB	0	0
6	Locked	QAM256	5	459000000 Hz	5.8 dBmV	40.5 dB	0	0
7	Locked	QAM256	6	465000000 Hz	5.4 dBmV	40.4 dB	0	0
8	Locked	QAM256	7	471000000 Hz	5.5 dBmV	40.4 dB	0	0
9	Locked	QAM256	8	477000000 Hz	5.5 dBmV	40.4 dB	0	0
10	Locked	QAM256	9	483000000 Hz	5.8 dBmV	40.5 dB	0	0
11	Locked	QAM256	10	489000000 Hz	6.1 dBmV	40.5 dB	0	0
12	Locked	QAM256	11	495000000 Hz	6.4 dBmV	40.4 dB	0	0
13	Locked	QAM256	12	507000000 Hz	6.7 dBmV	40.5 dB	0	0
14	Locked	QAM256	13	513000000 Hz	6.8 dBmV	40.6 dB	0	0
15	Locked	QAM256	14	519000000 Hz	6.3 dBmV	40.6 dB	0	0
16	Locked	QAM256	15	525000000 Hz	6.6 dBmV	40.8 dB	0	0
17	Locked	QAM256	16	531000000 Hz	6.1 dBmV	40.8 dB	0	0
18	Locked	QAM256	18	543000000 Hz	6.1 dBmV	40.7 dB	0	0
19	Locked	QAM256	19	549000000 Hz	6.1 dBmV	40.7 dB	0	0
20	Locked	QAM256	20	555000000 Hz	6.7 dBmV	40.9 dB	0	0
21	Locked	QAM256	21	561000000 Hz	7.1 dBmV	40.9 dB	0	0
22	Locked	QAM256	22	567000000 Hz	7.4 dBmV	41.1 dB	0	0
23	Locked	QAM256	23	573000000 Hz	7.4 dBmV	40.9 dB	0	0
24	Locked	QAM256	24	579000000 Hz	7 dBmV	40.9 dB	0	0
25	Locked	QAM256	25	585000000 Hz	6.8 dBmV	40.8 dB	0	0
26	Locked	QAM256	26	591000000 Hz	6.5 dBmV	41 dB	0	0
27	Locked	QAM256	27	597000000 Hz	6.1 dBmV	41.1 dB	0	0
28	Locked	QAM256	28	603000000 Hz	6.9 dBmV	41.2 dB	0	0
29	Locked	QAM256	29	609000000 Hz	5.8 dBmV	41 dB	0	0
30	Locked	QAM256	30	615000000 Hz	7 dBmV	41 dB	0	0
31	Locked	QAM256	31	621000000 Hz	6.7 dBmV	41 dB	0	0
32	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	1	5120 Ksym/sec	35600000 Hz	43.5 dBmV
2	Locked	ATDMA	2	5120 Ksym/sec	29200000 Hz	44 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	22800000 Hz	44 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	16400000 Hz	44 dBmV
5	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV

Downstream OFDM Channels

Channel	Lock Status	Modulation / Profile ID	Channel ID	Frequency	Power	SNR / MER	Active Subcarrier Number Range	Unerrored Codewords	Correctable Codewords	Uncorrectable Codewords
1	Locked	0 ,1 ,2 ,3	33	678000000 Hz	7.7 dBmV	40.6 dB	1108 ~ 2987	107783651	105295721	0
2	Not Locked	0	0	0 Hz	0 dBmV	0.0 dB	0 ~ 4095	0	0	0

Upstream OFDMA Channels

Channel	Lock Status	Modulation / Profile ID	Channel ID	Frequency	Power
1	Not Locked	0	0	0 Hz	0 dBmV
2	Not Locked	0	0	0 Hz	0 dBmV

Extended Upstream Transmit Power

Enable Extended Upstream Transmit Power

Current System Time:Sun Mar 28 06:41:00 2021

System Up Time:13:47:03

I'm at a loss to explain why I'm not getting the plan's reported speed. I think I've isolated just about everything on the system except changing out LAN card in desktop but I'm thinking that's not it since I was briefly seeing 700-800MB before it dropped back down to 320-380MB. Coax cable from tap on line to modem - check (good - no interference, no power drop, per Xfinity Tech). Cat 6 - check (good, tried two different ones). Modem - Check (three different modems, three different manufacturers). Power levels in spec - check (Xfinity Tech confirmed).

I'm at a loss to figure this out. Hopefully someone will have an idea.

(edited)

1

0

EG

Expert

•

111.5K Messages

@BobH2015

Please create a new topic of your own / re-post (copy and paste your post) here on this board. Thanks. Year old dead now being closed.

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
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4 years ago

0

Your Home Network

AE1M

How to enable Gb Speed

brintonh

EG

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