Quantcast
Channel: Basic Internet Connectivity And Modem Help topics
Viewing all articles
Browse latest Browse all 12065

High BER when ground is connected to the comcast cable access point outside home

$
0
0

Hi,

I am new to this forum. I have seen lot of useful info here, so wanted to get some suggestion on the issue I am facing.

I have comcast internet though a coax cable that is avaiable next to my main circuit breakers ouside my house. There is ground line connecting betwen the main electric box from PGE to the comcast cable junction box where the comcast cable is connected to the cable in my house that goes to the modem.

When this ground line is conneted the Bit Error Rate (BER) at the cable junction box is really bad and take as big jump. This BER goes back to almost zero when the ground line is disconnected. 

I understand its not advisable to remove this ground line as in its absence i could have big current on the coax cable connecting the comcast junction box to my cable modem in the house.

 

Eeven if i remove the ground there connection is really bad with atleast 3% packet loss after running "ping -t" for 15-20 mins. This makes using any kind of video streaming or high bandwidth uses impossible. 

The speed test is good and i have 28Mbps DS and 4.5 Mbps US. But i understand the speed test may be meaningless if i have high BER.

I have swapped by Modem and router over the period of last 6months to see if there is improvement but i had no luck. At this point i fee like i am better off uisng a 4G hotspot than comcast internet with the kind of packaet loss that i am seeing.

Here are the details i could see by logging into my modem (Cisco PDC3008 DOSIS3 Modem) in terms of the signal it is seeing:

 

DOWNSTREAM CHANNELS:

 

                               Power Level                          SNR

 

Ch#1                   -1.1dBmV                                   41.5dB

Ch#2                   -2.7dBmV                                   41.0dB

Ch#3                   -1.7dBmV                                   41.9dB

Ch#4                   -1.0dBmV                                   41.5dB

Ch#5                   -0.7dBmV                                   41.6dB

Ch#6                   -0.6dBmV                                   41.5dB

Ch#7                   -0.6dBmV                                   41.6dB

Ch#8                   -0.3dBmV                                   42.1dB

 

UPSTREAM CHANNELS:

 

                               Power Level                          

 

Ch#1                   35.5dBmV

Ch#2                   35.0dBmV

Ch#3                   37.0dBmV

Ch#4                   36.3dBmV

 

After doing some online research I was thinking of installing an isolator or a LPF next to my cable modem and see if it helps. I was looking at the ones avaiable here:

http://www.cencom94.com/gpage.html8.html

The situation is that even if the ground connection to the comcats cable box is removed, i still have high packet loss, so i am not sure if any of these solutions would work for me.

 

PGE has done some tests on the ground with their own test loads and say that there is nothing wrong with the ground in my PGE pannel.  I did some research and understand that it's normal to have some voltage difference between the various grounds in the house, because there is no absolute ground, and there will be voltage diff betwen different grounding rods etc.

 

I have had a few visits from comcast technicians but they did not yeald any resolution to my problem.

I am open to (rather desperate for) any suggestion that the fellow forum members may have. 

 

 

thanks,

Jacklen


Viewing all articles
Browse latest Browse all 12065

Trending Articles



<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>