CM600 - slow speeds, is it the modem or Comcast?

Aspirant

May 20, 2020

Hello again,

I went to target and picked up an SB6190 which seemed to completely resolve the problems after activating. Speeds were up to 200mbps as expected. After several hours speeds seemed to come back to around 20-50. I took a look at the status page and noticed something interesting. While the channels don't entirely line up (and I seem to have some more of them on this modem) it looks like the frequency ranges (615-633mhz) match up between both modems where there's an issue! I'm guessing that means the issues I'm having are not modem related. Thoughts?

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Corrected	Uncorrectables
1	Locked	256QAM	16	471.00 MHz	6.00 dBmV	38.98 dB	0	0
2	Locked	256QAM	17	477.00 MHz	5.90 dBmV	40.37 dB	0	0
3	Locked	256QAM	18	483.00 MHz	6.20 dBmV	38.98 dB	0	0
4	Locked	256QAM	19	489.00 MHz	6.10 dBmV	38.98 dB	4	0
5	Locked	256QAM	20	495.00 MHz	6.10 dBmV	38.98 dB	9	0
6	Locked	256QAM	21	507.00 MHz	6.00 dBmV	38.61 dB	0	0
7	Locked	256QAM	22	513.00 MHz	6.00 dBmV	38.98 dB	0	0
8	Locked	256QAM	23	519.00 MHz	5.90 dBmV	38.98 dB	0	0
9	Locked	256QAM	24	525.00 MHz	5.90 dBmV	38.61 dB	15	0
10	Locked	256QAM	25	531.00 MHz	5.90 dBmV	38.98 dB	8	0
11	Locked	256QAM	26	543.00 MHz	5.90 dBmV	40.37 dB	0	0
12	Locked	256QAM	27	549.00 MHz	5.90 dBmV	38.98 dB	0	0
13	Locked	256QAM	28	555.00 MHz	6.20 dBmV	38.98 dB	1	0
14	Locked	256QAM	29	561.00 MHz	6.20 dBmV	38.98 dB	2	0
15	Locked	256QAM	30	567.00 MHz	6.20 dBmV	40.37 dB	0	0
16	Locked	256QAM	31	573.00 MHz	6.10 dBmV	38.98 dB	0	0
17	Locked	256QAM	32	579.00 MHz	6.30 dBmV	38.98 dB	0	0
18	Locked	256QAM	33	585.00 MHz	6.50 dBmV	38.98 dB	0	0
19	Locked	256QAM	34	591.00 MHz	6.40 dBmV	38.98 dB	1	0
20	Locked	256QAM	35	597.00 MHz	6.60 dBmV	40.37 dB	0	0
21	Locked	256QAM	36	603.00 MHz	6.60 dBmV	38.61 dB	0	0
22	Locked	256QAM	37	609.00 MHz	6.80 dBmV	38.98 dB	2	0
23	Locked	256QAM	38	615.00 MHz	6.60 dBmV	38.61 dB	301	24
24	Not Locked	----	39	621.00 MHz	----	----	----	----
25	Not Locked	----	40	627.00 MHz	----	----	----	----
26	Locked	256QAM	41	633.00 MHz	6.90 dBmV	37.30 dB	65505	57591
27	Locked	256QAM	42	639.00 MHz	6.70 dBmV	38.90 dB	0	0
28	Locked	256QAM	43	645.00 MHz	6.70 dBmV	39.50 dB	1	0
29	Locked	256QAM	44	651.00 MHz	6.40 dBmV	39.20 dB	2	0
30	Locked	256QAM	45	657.00 MHz	6.40 dBmV	39.20 dB	0	0
31	Locked	256QAM	46	663.00 MHz	6.40 dBmV	39.50 dB	2	0
32	Locked	256QAM	47	669.00 MHz	6.40 dBmV	39.50 dB	2	0

14	Locked	QAM256	37	609000000 Hz	6.7 dBmV	40.1 dB	4	0
15	Locked	QAM256	38	615000000 Hz	6.7 dBmV	37.7 dB	361412	85
16	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
17	Locked	QAM256	40	627000000 Hz	6.7 dBmV	29.2 dB	63118	163135
18	Locked	QAM256	41	633000000 Hz	6.8 dBmV	40.3 dB	3140	1147

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CM600 - slow speeds, is it the modem or Comcast?