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EverydayJoe
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Sat, Feb 6, 2021 6:00 AM

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.

EverydayJoe_0-1612620300792.png

EverydayJoe_1-1612620400507.pngEverydayJoe_2-1612620864507.png

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

Question

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2 m ago

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EG

Expert

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86.2K Messages

2 m 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 !

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
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EverydayJoe

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5 Messages

2 m 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
ProcedureStatusComment
Acquire Downstream Channel453000000 HzLocked
Connectivity StateOkOperational
Boot StateOkOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDhonorMdd(4)
Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectable
1LockedQAM 2561381000000 Hz0.4 dBmV38.6 dB00
2LockedQAM 2562387000000 Hz0.0 dBmV38.6 dB01
3LockedQAM 2563393000000 Hz0.0 dBmV38.9 dB00
4LockedQAM 2564399000000 Hz0.0 dBmV38.9 dB110
5LockedQAM 2565405000000 Hz-0.2 dBmV38.9 dB00
6LockedQAM 2566411000000 Hz-0.2 dBmV37.6 dB00
7LockedQAM 2567417000000 Hz-0.5 dBmV38.6 dB80
8LockedQAM 2568423000000 Hz-0.7 dBmV37.6 dB1060
9LockedQAM 2569453000000 Hz-2.7 dBmV37.6 dB00
10LockedQAM 25610459000000 Hz-2.7 dBmV37.6 dB00
11LockedQAM 25611465000000 Hz-3.0 dBmV37.3 dB00
12LockedQAM 25612471000000 Hz-3.4 dBmV37.3 dB00
13LockedQAM 25613477000000 Hz-3.5 dBmV37.6 dB00
14LockedQAM 25614483000000 Hz-3.7 dBmV37.6 dB120
15LockedQAM 25615489000000 Hz-4.0 dBmV36.6 dB280
16LockedQAM 25616495000000 Hz-3.9 dBmV37.3 dB220
17LockedQAM 25617519000000 Hz-4.0 dBmV37.3 dB00
18LockedQAM 25618525000000 Hz-4.0 dBmV37.3 dB00
19LockedQAM 25619531000000 Hz-3.9 dBmV37.3 dB00
20LockedQAM 25620537000000 Hz-4.0 dBmV37.6 dB00
21LockedQAM 25621543000000 Hz-4.2 dBmV37.3 dB00
22LockedQAM 25622549000000 Hz-4.4 dBmV37.3 dB00
23LockedQAM 25623555000000 Hz-4.2 dBmV37.3 dB00
24LockedQAM 25624561000000 Hz-4.5 dBmV37.3 dB00
25LockedQAM 25625567000000 Hz-4.7 dBmV37.6 dB00
26LockedQAM 25626573000000 Hz-5.0 dBmV37.3 dB00
27LockedQAM 25627579000000 Hz-5.5 dBmV37.3 dB00
28LockedQAM 25628585000000 Hz-5.7 dBmV37.3 dB00
29LockedQAM 25629591000000 Hz-5.7 dBmV36.9 dB00
30LockedQAM 25630597000000 Hz-6.2 dBmV36.9 dB00
31LockedQAM 25631603000000 Hz-6.7 dBmV36.9 dB00
32LockedQAM 25632609000000 Hz-6.7 dBmV36.9 dB00
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA255120 Ksym/sec17300000 Hz36.8 dBmV
2LockedATDMA265120 Ksym/sec23700000 Hz37.0 dBmV
3LockedATDMA275120 Ksym/sec30100000 Hz38.5 dBmV
4LockedATDMA285120 Ksym/sec36500000 Hz38.0 dBmV
5Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
6Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
7Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
8Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV

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EG

Expert

 • 

86.2K Messages

2 m ago

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

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!tick

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