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

[EverydayJoe]

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

[EG]

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 !

[EverydayJoe]

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

[EG]

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