Inconsistent Speed, Lost MDD Timeout errors, and Service Change Response rejected - Invalid transact

I've been troubleshooting my inconsistent internet speeds with Comcast support for the last 3 weeks. They have not been very helpful and have told me that the issue must be with my modem/router or with the line in my house. I have a line tester and there are no shorts on my end. Comcast won't send a technician unless there is an outage in the area.

Based on what I've read on this forum, I've eliminated any splitters and connectors that are not needed. I have a signal booster connected outside directly connected to my feed from Comcast. It's a two-way splitter/booster. One outline connects directly to my Modem/router and the other connects directly to my Comcast cable box.

My Equipment: Netgear Orbi CBR40 with 2 satellites (RBS20 and RBS50). Signal booster is an Arris BDA-42-2-PR-R

My service is for 200Mbps but I'm getting speeds all over the place. (see image) If I do a reboot the signal will improve for a short time but eventually slows down to less than 10Mbps.

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectable
1	Locked	QAM 256	1	381000000 Hz	11.4 dBmV	38.6 dB	69	0
2	Locked	QAM 256	2	387000000 Hz	11.0 dBmV	38.9 dB	89	0
3	Locked	QAM 256	3	393000000 Hz	10.8 dBmV	38.9 dB	90	0
4	Locked	QAM 256	4	399000000 Hz	10.0 dBmV	38.9 dB	61	0
5	Locked	QAM 256	5	405000000 Hz	9.1 dBmV	38.6 dB	57	0
6	Locked	QAM 256	6	411000000 Hz	7.9 dBmV	37.6 dB	114	39
7	Locked	QAM 256	7	417000000 Hz	6.8 dBmV	37.6 dB	175	33
8	Locked	QAM 256	8	423000000 Hz	6.5 dBmV	37.3 dB	2121614	167764
9	Locked	QAM 256	9	453000000 Hz	6.5 dBmV	37.6 dB	111	0
10	Locked	QAM 256	10	459000000 Hz	6.0 dBmV	37.6 dB	101	0
11	Locked	QAM 256	11	465000000 Hz	5.5 dBmV	38.6 dB	184	3
12	Locked	QAM 256	12	471000000 Hz	5.4 dBmV	37.3 dB	200	0
13	Locked	QAM 256	13	477000000 Hz	5.1 dBmV	37.6 dB	207	0
14	Locked	QAM 256	14	483000000 Hz	4.6 dBmV	37.3 dB	242	0
15	Locked	QAM 256	15	489000000 Hz	2.7 dBmV	35.7 dB	352	0
16	Locked	QAM 256	16	495000000 Hz	1.0 dBmV	35.5 dB	436	0
17	Locked	QAM 256	17	519000000 Hz	-3.2 dBmV	31.6 dB	7967214	2895181
18	Locked	QAM 256	18	525000000 Hz	-3.0 dBmV	29.5 dB	8140380	2101191
19	Locked	QAM 256	19	531000000 Hz	-1.0 dBmV	32.3 dB	4726208	1422954
20	Locked	QAM 256	20	537000000 Hz	1.4 dBmV	33.0 dB	2349611	202341
21	Locked	QAM 256	21	543000000 Hz	3.5 dBmV	37.3 dB	171	0
22	Locked	QAM 256	22	549000000 Hz	1.0 dBmV	35.7 dB	418	1118
23	Locked	QAM 256	23	555000000 Hz	-3.0 dBmV	27.8 dB	464502607	204514085
24	Locked	QAM 256	24	561000000 Hz	-6.5 dBmV	26.9 dB	143933751	205430788
25	Locked	QAM 256	25	567000000 Hz	-8.7 dBmV	29.4 dB	20601859	647871
26	Locked	QAM 256	26	573000000 Hz	-10.2 dBmV	29.5 dB	4154125	16775
27	Locked	QAM 256	27	579000000 Hz	-11.7 dBmV	28.8 dB	42150277	15973
28	Locked	QAM 256	28	585000000 Hz	-11.9 dBmV	28.6 dB	68675259	12504
29	Locked	QAM 256	29	591000000 Hz	-12.0 dBmV	28.4 dB	188515672	38435
30	Locked	QAM 256	30	597000000 Hz	-12.7 dBmV	28.1 dB	645911441	861313
31	Locked	QAM 256	31	603000000 Hz	-12.7 dBmV	28.6 dB	153100881	9840
32	Locked	QAM 256	32	609000000 Hz	-11.2 dBmV	29.8 dB	891974	35

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	25	5120 Ksym/sec	17300000 Hz	41.8 dBmV
2	Locked	ATDMA	26	5120 Ksym/sec	23700000 Hz	42.0 dBmV
3	Locked	ATDMA	27	5120 Ksym/sec	30100000 Hz	42.5 dBmV
4	Locked	ATDMA	28	5120 Ksym/sec	36500000 Hz	42.5 dBmV
5	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV

Responses

EG

Expert

•

111.6K Messages

4 years ago

Many of the downstream channels are borked. There is too much cable signal *tilt* (power level difference between the lowest and the highest frequencies), and many of the SNR's are too low / out of spec.

You should get the techs re-involved until it is fixed properly. Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.
Good luck !

0

EverydayJoe

New Poster

•

5 Messages

4 years ago

After hours on the phone with Comcast support, they finally sent a technician out. The line feeding my house was bad...BIG Surprise!

I just want to point this out for everyone else who spends time jumping thru hoops with Comcast customer service. Don't give up! It's taken me a month of weekly calls and Comcast pointing the finger at my internal connections and my Netgear Orbi Modem/Router. They told me several times that I needed to purchase/rent an Xfinity modem for $14.99 a month to resolve the issue. Terrible, just plain terrible.

That being said, I'm now getting speeds of 200-210Mbps without the need for a signal booster!

Here are my new connection numbers. Thanks to everyone that posts here and hopefully Comcast reads these posts to improve their service SOPs.

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	453000000 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	Uncorrectable
1	Locked	QAM 256	1	381000000 Hz	0.4 dBmV	38.6 dB	0	0
2	Locked	QAM 256	2	387000000 Hz	0.0 dBmV	38.6 dB	0	1
3	Locked	QAM 256	3	393000000 Hz	0.0 dBmV	38.9 dB	0	0
4	Locked	QAM 256	4	399000000 Hz	0.0 dBmV	38.9 dB	11	0
5	Locked	QAM 256	5	405000000 Hz	-0.2 dBmV	38.9 dB	0	0
6	Locked	QAM 256	6	411000000 Hz	-0.2 dBmV	37.6 dB	0	0
7	Locked	QAM 256	7	417000000 Hz	-0.5 dBmV	38.6 dB	8	0
8	Locked	QAM 256	8	423000000 Hz	-0.7 dBmV	37.6 dB	106	0
9	Locked	QAM 256	9	453000000 Hz	-2.7 dBmV	37.6 dB	0	0
10	Locked	QAM 256	10	459000000 Hz	-2.7 dBmV	37.6 dB	0	0
11	Locked	QAM 256	11	465000000 Hz	-3.0 dBmV	37.3 dB	0	0
12	Locked	QAM 256	12	471000000 Hz	-3.4 dBmV	37.3 dB	0	0
13	Locked	QAM 256	13	477000000 Hz	-3.5 dBmV	37.6 dB	0	0
14	Locked	QAM 256	14	483000000 Hz	-3.7 dBmV	37.6 dB	12	0
15	Locked	QAM 256	15	489000000 Hz	-4.0 dBmV	36.6 dB	28	0
16	Locked	QAM 256	16	495000000 Hz	-3.9 dBmV	37.3 dB	22	0
17	Locked	QAM 256	17	519000000 Hz	-4.0 dBmV	37.3 dB	0	0
18	Locked	QAM 256	18	525000000 Hz	-4.0 dBmV	37.3 dB	0	0
19	Locked	QAM 256	19	531000000 Hz	-3.9 dBmV	37.3 dB	0	0
20	Locked	QAM 256	20	537000000 Hz	-4.0 dBmV	37.6 dB	0	0
21	Locked	QAM 256	21	543000000 Hz	-4.2 dBmV	37.3 dB	0	0
22	Locked	QAM 256	22	549000000 Hz	-4.4 dBmV	37.3 dB	0	0
23	Locked	QAM 256	23	555000000 Hz	-4.2 dBmV	37.3 dB	0	0
24	Locked	QAM 256	24	561000000 Hz	-4.5 dBmV	37.3 dB	0	0
25	Locked	QAM 256	25	567000000 Hz	-4.7 dBmV	37.6 dB	0	0
26	Locked	QAM 256	26	573000000 Hz	-5.0 dBmV	37.3 dB	0	0
27	Locked	QAM 256	27	579000000 Hz	-5.5 dBmV	37.3 dB	0	0
28	Locked	QAM 256	28	585000000 Hz	-5.7 dBmV	37.3 dB	0	0
29	Locked	QAM 256	29	591000000 Hz	-5.7 dBmV	36.9 dB	0	0
30	Locked	QAM 256	30	597000000 Hz	-6.2 dBmV	36.9 dB	0	0
31	Locked	QAM 256	31	603000000 Hz	-6.7 dBmV	36.9 dB	0	0
32	Locked	QAM 256	32	609000000 Hz	-6.7 dBmV	36.9 dB	0	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	25	5120 Ksym/sec	17300000 Hz	36.8 dBmV
2	Locked	ATDMA	26	5120 Ksym/sec	23700000 Hz	37.0 dBmV
3	Locked	ATDMA	27	5120 Ksym/sec	30100000 Hz	38.5 dBmV
4	Locked	ATDMA	28	5120 Ksym/sec	36500000 Hz	38.0 dBmV
5	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV

0

EG

Expert

•

111.6K Messages

4 years ago

There's still a little bit of tilt there but it is much much better ! Hope things hold up for you. Good luck !

0

Your Home Network

EverydayJoe

Inconsistent Speed, Lost MDD Timeout errors, and Service Change Response rejected - Invalid transact

EG

EverydayJoe

EG

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