Re: 31 of 32 Downstream Bonded Channels

I am experiencing a similar issue, only getting 31 of 32 locked channels with a Netgear CM1100 modem and unable to sustain speeds more than about 900 mbps. I have also enabled link aggregation on the WAN ports to my router hoping it would allow me to get the full bandwidth, but that has not helped.

Could the lack of all 32 channels locking be the issue? It would be great if a knowledgeable Comcast tech could reply!

Responses

EG

Expert

•

111.4K Messages

4 years ago

Be advised that many, if not most local systems have dropped back from using 32 downstream channels to using 31 since the DOCSIS 3.1 / OFDM channel for the gigabit speed tier was implemented. The gig speed tier is delivered via that channel, not the QAM256 channels.

Is there a downstream channel labeled as *OFDM / PLC* or as *Other* being shown ?

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

Also post the error log entries in their entirety.

dude1

New Poster

•

3 Messages

4 years ago

Hi, thanks for your assistance. Here is what the cable connection screen on the CM1100 cable modem is showing:

Frequency start Value

This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.

Starting Frequency

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	567000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enable	BPI+
IP Provisioning Mode	Honor MDD	IPv6 only

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR / MER	Unerrored Codewords	Correctable Codewords	Uncorrectable Codewords
1	Locked	QAM256	29	567000000 Hz	2.4 dBmV	40.5 dB	1907365964	1863	0
2	Locked	QAM256	1	375000000 Hz	2.3 dBmV	42.3 dB	1906239269	143	0
3	Locked	QAM256	2	381000000 Hz	2.6 dBmV	42.3 dB	1906244515	175	0
4	Locked	QAM256	3	387000000 Hz	2.2 dBmV	42.4 dB	1906246002	180	0
5	Locked	QAM256	4	393000000 Hz	2.1 dBmV	42.2 dB	1906249875	179	0
6	Locked	QAM256	5	399000000 Hz	1.8 dBmV	42.4 dB	1906254702	197	0
7	Locked	QAM256	6	405000000 Hz	1.7 dBmV	42.3 dB	1906260096	235	0
8	Locked	QAM256	7	411000000 Hz	1.7 dBmV	42.2 dB	1906262748	262	0
9	Locked	QAM256	8	417000000 Hz	1.9 dBmV	42.2 dB	1906277664	241	0
10	Locked	QAM256	9	423000000 Hz	2.0 dBmV	42.1 dB	1906283589	253	0
11	Locked	QAM256	10	435000000 Hz	2.6 dBmV	42.3 dB	1906289117	252	0
12	Locked	QAM256	11	441000000 Hz	2.8 dBmV	42.2 dB	1906290476	368	0
13	Locked	QAM256	12	447000000 Hz	3.0 dBmV	42.4 dB	1906293100	324	0
14	Locked	QAM256	13	453000000 Hz	3.2 dBmV	42.3 dB	1906297670	357	0
15	Locked	QAM256	14	459000000 Hz	3.3 dBmV	42.3 dB	1906301759	381	0
16	Locked	QAM256	15	465000000 Hz	3.2 dBmV	42.1 dB	1906303258	464	0
17	Locked	QAM256	16	471000000 Hz	2.8 dBmV	42.1 dB	1906355666	457	0
18	Locked	QAM256	17	477000000 Hz	2.9 dBmV	42.3 dB	1906360134	468	0
19	Locked	QAM256	18	483000000 Hz	2.4 dBmV	42.1 dB	1906364347	536	0
20	Locked	QAM256	19	489000000 Hz	2.4 dBmV	42.1 dB	1906367621	575	0
21	Locked	QAM256	20	495000000 Hz	2.4 dBmV	41.7 dB	1906370434	749	0
22	Locked	QAM256	21	519000000 Hz	3.0 dBmV	39.2 dB	1906374277	1019	0
23	Locked	QAM256	22	525000000 Hz	3.0 dBmV	41.9 dB	1906379487	823	0
24	Locked	QAM256	23	531000000 Hz	2.8 dBmV	41.9 dB	1906382915	1164	0
25	Locked	QAM256	24	537000000 Hz	2.8 dBmV	41.6 dB	1906386587	1407	0
26	Locked	QAM256	25	543000000 Hz	2.7 dBmV	41.8 dB	1906390014	1171	0
27	Locked	QAM256	26	549000000 Hz	2.3 dBmV	41.5 dB	1906394090	1686	0
28	Locked	QAM256	27	555000000 Hz	2.5 dBmV	41.6 dB	1906397299	1489	0
29	Locked	QAM256	28	561000000 Hz	2.6 dBmV	41.6 dB	1906399435	1390	0
30	Locked	QAM256	30	573000000 Hz	2.3 dBmV	41.5 dB	1906400948	1734	0
31	Locked	QAM256	31	579000000 Hz	2.0 dBmV	41.3 dB	1906400048	2199	0
32	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0	0

Upstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power
1	Locked	ATDMA	9	17300000 Hz	44.3 dBmV
2	Locked	ATDMA	10	23700000 Hz	43.5 dBmV
3	Locked	ATDMA	11	30100000 Hz	45.0 dBmV
4	Locked	ATDMA	12	36500000 Hz	43.8 dBmV
5	Not Locked	Unknown	0	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	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	690000000 Hz	0.7 dBmV	38.8 dB	1108 ~ 2987	3178031654	3127634514	0
2	Not Locked	0	0	0 Hz	1.1 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	Unknown	0	0 Hz	0 dBmV
2	Not Locked	Unknown	0	0 Hz	0 dBmV

dude1

New Poster

•

3 Messages

4 years ago

Great, thanks! My question is, can I use the wan aggregation feature of this modem to further increase the maximum by bonding the two gig connections on the modem? I thought Comcast typically overprovisions the available bandwidth. For example, when I had a 100mbps plan, I was getting rates close to 150 - 200mbps.

I was hoping by using the WAN aggregation feature of this modem and the netgear r7800 router to which it is connected, I could pull at or slightly higher than 1gbps.

The comcast tech who came to the house seemed to be getting around 1.2 using his equipment. He said he thought I may have been rate limited by the central office to no more than 1gbps, but if they are overprovisioning as they typically do, I thought by using wan aggregation, I could make use of this additional provisioned capacity.

Thanks for all your help!

EG

Expert

•

111.4K Messages

4 years ago

The stats are good. Be advised that around 940 (hardwired) is to be the max expected, so you are doing very well at 900.

EG

Expert

•

111.4K Messages

4 years ago

Give it a try. I've seen posts here indicating that some people do indeed get around 1.2 Gbps that way. Good luck !

Your Home Network

dude1

Re: 31 of 32 Downstream Bonded Channels

EG

dude1

dude1

EG

EG

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