Sydney417's profile

Contributor

 • 

60 Messages

Sat, Jun 12, 2021 7:46 PM

upstream, downstream issues

I have been having upstream and downstream issues for a very long time. At present my upstream light stays orange 98% of the time and the downstream flashes. A reset does not work 98% of the time, it may be ok for a few minutes but then it starts again. And of course, my speed is well under the 200 plan I have. Can Comcast check this?

 
 
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 447000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enabled BPI+
IP Provisioning Mode Honor MDD honorMdd(4)
 
Downstream Bonded Channels (Partial Service)
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 38 447000000 Hz -9.2 dBmV 38.5 dB 589 335
2 Locked QAM256 39 453000000 Hz -8.8 dBmV 38.7 dB 147887 321098
3 Locked QAM256 40 459000000 Hz -8.7 dBmV 38.4 dB 653 202
4 Locked QAM256 41 465000000 Hz -10.3 dBmV 37.1 dB 818 487
5 Locked QAM256 42 471000000 Hz -10.5 dBmV 35.8 dB 1524 583
6 Locked QAM256 43 477000000 Hz -10.1 dBmV 35.1 dB 2003 2002
7 Locked QAM256 44 483000000 Hz -11.5 dBmV 32.2 dB 3754 529
8 Not Locked Unknown 45 489000000 Hz 0.0 dBmV 0.0 dB 0 0
9 Not Locked Unknown 1 495000000 Hz 0.0 dBmV 0.0 dB 0 0
10 Locked QAM256 2 507000000 Hz -11.2 dBmV 32.1 dB 9584 1118
11 Locked QAM256 3 513000000 Hz -9.9 dBmV 34.1 dB 2020 426
12 Locked QAM256 4 519000000 Hz -10.8 dBmV 26.7 dB 22673174 3213700
13 Locked QAM256 5 525000000 Hz -11.4 dBmV 28.1 dB 21979653 884814
14 Locked QAM256 6 531000000 Hz -10.6 dBmV 29.9 dB 42838650 1594522
15 Locked QAM256 7 537000000 Hz -10 dBmV 28.9 dB 56594651 1710592
16 Locked QAM256 8 543000000 Hz -11.1 dBmV 34.6 dB 16679 740
17 Locked QAM256 9 549000000 Hz -9.7 dBmV 37.6 dB 0 0
18 Locked QAM256 10 555000000 Hz -9.1 dBmV 38.6 dB 0 0
19 Locked QAM256 11 561000000 Hz -11.2 dBmV 35.6 dB 0 0
20 Locked QAM256 12 567000000 Hz -10.9 dBmV 35.8 dB 0 0
21 Locked QAM256 13 573000000 Hz -11.1 dBmV 36.5 dB 0 0
22 Locked QAM256 14 579000000 Hz -12.2 dBmV 36.2 dB 0 0
23 Locked QAM256 15 585000000 Hz -11.8 dBmV 34 dB 0 0
24 Locked QAM256 16 591000000 Hz -10.3 dBmV 34.3 dB 0 0
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 57 dBmV
2 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
3 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
4 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
 
Extended Upstream Transmit Power
Enable Extended Upstream Transmit Power
 
Current System Time:Sat Jun 12 13:33:38 2021
System Up Time:06:28:26

Responses

Accepted Solution

EG

Expert

 • 

87.9K Messages

1 m ago

The upstream power is still out of spec. If there's nothing more that you can do then I will repeat this again;

Get a tech out to investigate. 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 !

(edited)

EG

Expert

 • 

87.9K Messages

1 m ago

The power levels and the SNR's are out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In an effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1000 MHz, bi-directional, and no gold colored garbage from Radio Shack, Home Depot, Target, etc. Splitters should be swapped with known to be good / new ones to test.

Also check the coax cable for any damage such as cuts, nicks, kinks, sharp bends, etc.

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two-way splitter connected directly off of the drop from the street / pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.


Good luck with it !

EG

Expert

 • 

87.9K Messages

1 m ago

It may not be the actual cause of the problem in this case but the splitters should be  swapped out for 5-1000(2) ones (unless you are using a MoCA setup). It is engineered for satellite systems, not cable systems. It can actually make performance worse by allowing line noise ingress at those higher frequencies that cable systems do not operate on.

So, if none of the tips apply then get a tech out to investigate as stated. 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 !

EG

Expert

 • 

87.9K Messages

1 m ago

The downstream power and the SNR's are much better but the upstream power is still too high / out of spec. What was done ?

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