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Author Topic: BER, What is it and how to fix it?  (Read 2564 times)

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BER, What is it and how to fix it?
« on: November 18, 2006, 03:33:34 PM »
SEETEE brought something up that I was struggling with today. BER, What is it and how do I fix it?
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way to go chappy!  that was the most abrupt hijack i've ever seen on here!  :sixer:

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BER, What is it and how to fix it?
« Reply #1 on: November 18, 2006, 03:37:47 PM »
Bit Error Rate. Pretty much Ingress. Like SNR. Its like the Digital version of analog SNR. Fixed pretty much the same way plain ole SNR is fixed.

Dam noise.
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BER, What is it and how to fix it?
« Reply #2 on: November 18, 2006, 06:18:17 PM »
Any number of things can cause the BER to be disturbed.  Bit Error Rate basically tells you the number of erroneous bits that failed to reach their destination.  Be it ingress, a kink in the cable, or a bad fitting, any of these things will disrupt the proper flow of information.

When reading BER, there is both pre and post BER.  Pre is the number of bits before error correction, or the resending of bits that were disrupted.  Post BER   is the number of bit errors after error correction, meaning that if the post BER is correct (1.0E-9) then any bits that were interrupted were successfully resent and the data arrived in whole.  Ideally, you would like both pre and post to be identical, but it is primarily the post BER that you are concerned with.

Troubleshooting still consists of divide and conquer.  If you have a bad BER at the box, then backtrack and remeasure until your BER is up to par and repair accordingly.
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BER, What is it and how to fix it?
« Reply #3 on: November 18, 2006, 06:27:56 PM »
I was troubleshooting a crazy error count issue on a digi box. The whole house was 59.
I re-ran wall fish from the basement to the 2nd floor and increased the db by 10. Still an issue on ONE FREQ.
I decided to replace the outlet as well from the attic ( wallfished as well but WWAAYY in the armpit of the attic/roof) I started pulling on the cable from the attic and pulled about 10' of cable up. Suddenly I heard the channel pop in.

Checked diagnostics, error count gone. Picture perfect. The cable was KINKED  and chokinig the one freq.
First time I ever saw that happen. Heard about it.. but never ran across it.  :shock:
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BER, What is it and how to fix it?
« Reply #4 on: November 18, 2006, 07:09:15 PM »
where can i buy the books that will give me the information that you guys have?
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BER, What is it and how to fix it?
« Reply #5 on: November 19, 2006, 05:01:12 AM »
Another big offender of BER is active's out of balance.  When I first got my meter, I never realized just how bad an additional 2 db could be.  

Sunrise telecom's website has training info concerning BER and a whole lot of other useful training.  I can't seem to locate it right now, their site maybe done.  However the meter came with a disk that has the same training on it.  I'll look for the disk, and see if I can get it uploaded for ya. :D
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BER, What is it and how to fix it?
« Reply #6 on: November 19, 2006, 05:57:38 AM »
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Another big offender of BER is active's out of balance.  When I first got my meter, I never realized just how bad an additional 2 db could be.  
 

 
I totally agree with you brn2bow, it's amazing how bad balancing can affect the BER.  We have also run into (more often lately) the amps themselves causing the MER and BER problems.  One big one we found last year was some of the mini bridger power packs would cause intermittent drop of MER(which we also found was a drop in DC voltage from the power pack)Sometimes resulting in a MER as low as a 25 causing nasty tiling.
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BER, What is it and how to fix it?
« Reply #7 on: November 19, 2006, 08:35:07 AM »
but when you are using your 860 dont be using your nextell or that will show ber
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BER, What is it and how to fix it?
« Reply #8 on: November 19, 2006, 08:52:24 AM »
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but when you are using your 860 dont be using your nextell or that will show ber


Whoa! You just blew my  mind!!




What is the difference measured?!
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Quote from: Log In to View on January 13, 2011, 08:36:22 PM
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BER, What is it and how to fix it?
« Reply #9 on: November 19, 2006, 12:36:57 PM »
Biggest problem that we've seen with the balancing, is more with the AGC's than anything.  They stick alot.  We have 1 area that is like 11 or 12 actives deep.   :twisted:   Imagine the call-ins.  Makes me glad to not be riding that van now. :D
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BER, What is it and how to fix it?
« Reply #10 on: November 19, 2006, 02:19:51 PM »
also don't bump your dsam cause that will show ber too...
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BER, What is it and how to fix it?
« Reply #11 on: November 19, 2006, 04:12:34 PM »
Click here, nice paper in PDF format all about BER and MER
http://www.sunrisetelecom.com/broadband/MER_BER_and_More_1.02.pdf

Another link to a variety of papers

http://www.gemini-inc.com/appnotes.htm

RF
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BER, What is it and how to fix it?
« Reply #12 on: November 19, 2006, 05:24:17 PM »
"One big one we found last year was some of the mini bridger power packs would cause intermittent drop of MER(which we also found was a drop in DC voltage from the power pack)Sometimes resulting in a MER as low as a 25 causing nasty tiling."

Oh yes the mini bridger bullshit. Easiest way for me is to just pop off the lid completley and just un-plug replug the new power pack module and there you are good MER's and pre and post BER's with 1>-9/1>-9
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BER, What is it and how to fix it?
« Reply #13 on: November 19, 2006, 05:25:50 PM »
Great stuff!!!! !pint
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BER, What is it and how to fix it?
« Reply #14 on: November 19, 2006, 09:20:57 PM »
Check out some of the links on the home page..  8)
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BER, What is it and how to fix it?
« Reply #14 on: November 19, 2006, 09:20:57 PM »
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