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Bit Error Rate Modem

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I'll give a (hopefully final) update in a day or so. Mounting Antenna [HomeImprovement] by DarkLogix273. Assuming perfect timing and carrier recovery the received sample will typically be the transmitted symbol with additional noise: $$ r = s_k + n $$ Under typical situations (the noise is Log in or Sign up TechPowerUp Forums www.techpowerup.com Forums > Hardware > Networking & Security > Welcome to TechPowerUp Forums, Guest! http://sovidi.com/bit-error/bit-error-rate-and-data-rate-relation.php

What version? I will update again tomorrow once I see that it's consistent.Thanks for your prompt help! Let us know if you need further assistance. I estimate several days. --TerrorBite 30/1/06 13:03 AEST It depends on the error rate and the data rate.

Acceptable Bit Error Rate

All Rights Reserved | Pittsburgh, PAWebsite Development by Silicon Coast Important Contact Info: Cheetah Support: [email protected] Cheetah Sales: [email protected] Product Returns or Repairs: [email protected] Product Orders and Shipment: [email protected] Talk:Bit error Do I just need to upgrade to a 'modern' modem? DNS lookups appear to take several seconds in many cases, packet loss of 25-50% occurs with ping, and download speeds reduce from 4-5 Mbps quickly degrade to about 0.25 Mbps. I don't think I can return it, I don't have the physical packaging still.

My SNR seems low though I'm not sure, it's 27.4. There are certainly more sophisticated methods for sweeping bit error-rate curves. We'll see how it goes from here. Bit Error Rate Calculator This is not possible with analog communications, and is one of the reasons why digital communications are so prevalent in modern systems.

The modem estimates the SNR from the bit error rate, and an error rate of 4% would produce an appalingly low SNR. Bit Error Rate Measurement Be the first to submit a comment Leave your comment Guest Sunday, 02 October 2016 Subscribe to updates (Please fill in your email address to subscribe to blog updates.) About UsNewsCareersContact V-Cable changes [Ebox] by diskace472. What are the most likely causes?

no option to use my Motorola modem as I use their phone service). Bit Error Rate Tester Software We have seen comments from Sunrise and JDSU stating that BER is impractical for field testing. I then fed the newest coax I have from the outside through the window to bypass the current chunk of cable that comes into the house. At 129 MHz, signal levels are right around 0.0 dBm and SNR is more like 34 dB.

Bit Error Rate Measurement

What I observe is that after the power cycle, the BER will remain at 0% for a few days, then go wacky again.Particularly interesting is that the BER is spiking to Please login or register.Did you miss your activation email? 1 Hour 1 Day 1 Week 1 Month Forever Login with username, password and session length Home Help Search Login Register Acceptable Bit Error Rate Gaeddert on February 5, 2015 In this two-part tutorial I describe how to derive and simulate bit error rates for several linear modulation schemes using the C programming language. Bit Error Rate Pdf Therefore, a quasi-error free level, such as 1E-9, or one error in a billion, is used.

Washington mall attacker illegally voted in at least 3 elections [InTheNews] by Krisnatharok357. click site User is currently offline on Tuesday, 22 January 2013 in Uncategorized Hits: 42962 0 Comments Subscribe to updates Print PDF Bookmark | Tweet Bit Error Rate (BER) is a metric that Coupling MER with CER becomes a superior way to do low cost qualitative monitoring of a DOCSIS data channel. TWC seems to run 15/2 w/Speedboost to 25 Mbps+ DL using DOCSIS 1.x) · actions · 2009-Mar-29 8:27 pm · K PattersonPremium Memberjoin:2006-03-12Columbus, OHkudos:1

K Patterson Premium Member 2009-Mar-29 8:38 pm Bit Error Rate Tester

Mar 12, 2010 at 6:03 PM #2 OrbitzXT New Member Joined: Mar 22, 2007 Messages: 1,969 (0.57/day) Thanks Received: 59 Location: New York City System Specs System Name: AX-01 Processor: Intel ForumsJoin Search similar:7db difference on channel 70 vs channel 2 Forums → US ISPs cable → Time Warner Cable → what exactly is bit error rate? In hindsight, we should correct our literature to reflect that we do not do a BER test. http://sovidi.com/bit-error/bit-error-rate-data-rate.php The signal levels and SNR vary depending on which channel is connected, even when the connection is working well.

Stay logged in TechPowerUp Forums www.techpowerup.com Forums > Hardware > Networking & Security > TechPowerUp Forums Forums Quick Links Search Forums Recent Posts Members Members Quick Links Notable Members Current Visitors Bit Error Rate Testing Investigating a leak [HomeImprovement] by IowaCowboy255. The Received Signal Strength is about -8.1 which I believe isn't great but within normal operational range.

There is also a companion study that compares MER to BER.

If all three are there, then I am happy... Logged drt Newbie Posts: 17 Re: Degraded Internet Connections « Reply #14 on: May 22, 2012, 07:59:37 AM » They came and 'refreshed' some our connections and splits. The program produces an output file that should contain data that looks something like this: # modulation scheme : qpsk # SNR [dB] errors trials BER -5.00 574017 2000000 2.8701e-01 -4.00 Bit Error Rate Tester Agilent That's why it didn't require any real smarts on my part to know that something wasn't quite kosher with his BER numbers.

I'm going to call them soon, but I don't have the energy to disconnect my router since they refuse to do anything if I have it connected. Mange01 (talk) 02:07, 21 December 2009 (UTC) Support per nom. "Bit error rate" is the phrase used in all the technical documents I use from day-to-day, even though it may not You need a significant number of errors to have confidence in the BER. More about the author Each are used in different contexts. (Jim Waschura, SyntheSys Research, Inc.) berriz (talk) 13:48, 25 November 2007 (UTC) I was wondering the same thing, so I searched both terms in the

No further edits should be made to this section. Rate this blog entry 10 votes Tags: BER, CER, network monitoring « Network Reliability Status Monitoring, Performance Monitoring and CPE ... » About the author Related Posts Steve Day ( View Digital linear modem bit error rate demonstration. Windows Update Peer to Peer? [No,IWillNotFixYour#@$!!Computer] by battleop© DSLReports · Est.1999 · Sunday, 02-Oct 09:19:58 feedback · terms · Mobile mode RF Cafe Software RF Cascade Worbook Calculator Workbook RF Workbench

Overview colophon contact FAQ Documents documentation troubleshooting blog Source Code liquid-dsp (github) software license © 2016 Joseph D. Subsequent comments should be made in a new section on the talk page. Until I power cycle.Anyone else see this pattern of behavior with their RCA modem? Logged MediacomTim Guest Re: Degraded Internet Connections « Reply #4 on: May 17, 2012, 09:29:06 PM » You are welcome!Let us know if you have any other issues.

In this experience, Steve designed and ran the automated testing (ALIT/FORTEL) and service restoration programs. I didn't run the script and log last night, but from use on my laptop, things were poor until about 10:00pm, then after that speeds were good. A 'rate' is a specific type of 'ratio'. --71.10.226.43 (talk) 16:46, 11 September 2009 (UTC)Another way to look at it is that 'rate' usually implies a time-dependent function. This morning, I reset the modem and it again connected at 129 MHz, but SNR dropped a couple dB to the 28-29 dB range (but no sudden drops to 24 as

A RS decoder rated at t=3 can fix three symbols in any codeword. Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. i'm looking at my cable modem diag page, and it shows downstream snr at 39, signal strength 4.6dbmv, both of which are good, but the bit error rate is hovering at Honestly, about 80% of all field devices claiming BER testing would fall into the same trap.

More work is required to fully incorporate it and it is messy. After all, your SNR is very good. Were we able to resolve your issue? Privacy policy About Wikipedia Disclaimers Contact Wikipedia Developers Cookie statement Mobile view liquidsdr.org doc blog colophon search Linear Modem Bit Error Rates, Part I: Simulation By Joseph D.

just curious. · actions · 2009-Mar-24 7:48 pm · [email protected] NSA_CIA Anon 2009-Mar-24 9:01 pm It's indicative of intermittent interference that occasionally crosses into the downstream data channel.What frequency is the During the initialization sequence when communications are being established between the computer modem and the ISP modem, it was possible to hear the digital noise. Please try the request again. and so is my system.