General QUestion about error handling

Hello,
I am writing my own VI's to communicate with my hardware. Each one of the VI's incorporate numerous error checking routines to detect if the desired operation completed correctly. If error(s) are detected with a VI, the "Bundle by Name" VI is used to update the Natiinal Instruments error cluster with the appropriate info each time a error occurs.
What I am finding is that the VI error cluster contains the last error found, instead of the first error found. Please be aware that I am assuming (we know what that stands for) is that the National Instruments error cluster is accumulative, so if I add four errors to the cluster, then the error cluster contains at least four errors.
So how do I find the first error that was entered into the error cluster. I have found a vi called "Find First Error:, but I am confused (as usual) on how to get what I want. So I am asking for "divine guidance" or a kick in behind from the Labview wizards on how to correctly handle errors.
Regards,
Kaspar
Regards,
Kaspar

The cluster is a standard cluster and is not accumulative.
Usually, the way to handle this is to check the error in terminal and if it is has an error to pass the error instead of executing the code. That way, when you have an error, the rest of the code does not execute. Here's an example:
If you want to merge the error numbers, search the forums for Mike Porter's error stacker.
Try to take over the world!

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General question about iTunes Match and multiple libraries

Hello to everyone,
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About Error Handling.

Hi,
        Can any body give the brief idea of error handling.And what the option containing in the error handling tabs like
1. NO Update , No Reporting.
2. Update Valid Records only ,Reporting not possible(Request red).
3. Update Valid Records only ,Reporting possible(Request green).
          Is these options works above the error tolerance limit or below the error tolerance limit.
      like        Error Tolerance Limit   =   1000.
How can i Test it practically in Navigation.Plz send the detailed information about this.
Thanks in Advance,
D.Malla Reddy.

Hi,
     1 Valid Records Update, No Reporting (Request Red): When you select this option, you tell the system to isolate erroneous records in a data packet from the data load and to load the valid records into the data target. The data upload request remains in red status in the data target and is unavailable for reporting. With this option, the data administrator can check the error records and then manually turn the uploaded request to green, making the data available for reporting.
u2022     2 Valid Records Update, Reporting Possible (Request Green): When you select this option, you tell ETL to make the valid data available immediately for reporting in the data target.
u2022     No Update, No Reporting: When you select this option, you tell the system to suspend data processing to the data targets if it encounters an erroneous record, preventing further data from loading into the data target. The system keeps scanning the remaining data packages for erroneous records.
Another important aspect of error handling is the process to deal with the erroneous records. In SAP NetWeaver BI 7.0, the error handling process identifies the erroneous record from the original data upload request and isolates it by storing the records in a separate container called the error stack. After you correct or modify the erroneous records, you can then load them to the original intended data target by using a special DTP called the error DTP. This helps to ensure data consistency.
you can check the data packets data at monitor
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Edited by: Ramesh Raju on Feb 11, 2010 2:24 PM

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Asking general questions about 'computing' matters.

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I'm new to the Mac world - I posted my first question on the forums today!
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I have a notion that when one connects to a server directly (Usenet newsgroups for example) one makes a deliberate 'hole' in one's firewall, be it software or simply because one is using a NAT router.
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General question about Mountain Lion

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Questions about errors

These are my latest HH3a stats after a DLM resynch - part of an ongoing battle with it over the SNR
Connection Information
Line state:
Connected
Connection time:
2 days, 03:05:42
Downstream:
6.711 Mbps
Upstream:
888.9 Kbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
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G.992.5 Annex A
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Interleaved
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5.1 dB / 8.3 dB
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44.1 dB / 26.0 dB
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20.0 dBm / 12.6 dBm
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324989772 / 315
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761667 / 0
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Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
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7393116 / 2
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The errors an hour after the resynch were CRC 702269 HEC 6925930 Secs 28828
What I want to know/understand is why the errors were so high after the resynch and why am I currently still able to get the speed I can as in the past errors less than half the total shown have completely throttled the line.
FYI this is a follow on from this thread http://community.bt.com/t5/BB-Speed-Connection-Issues/Low-Noise-high-errors-again/td-p/734960
Solved!
Go to Solution.

It's not an easy question to answer ... but this may give you an insight.
Sync is acheived by the msan sending a series of tones down the line to the modem, and according to the acknowledgements, the modulation standard is set. The loop loss is measured electronically and according to same, the amount of SNR (not SNRm) is used to set power factors so that the dslam can transmit the databits over the frequencies for the tones that were accepted. Some tones and thus frequencies will have been lost, as the line can't sustain them, because of either outside influences or mere line length. Once the SNR and power is set, the dslam will apply a buffer which is normally target margin (6db) (can be 3db on DSL2 running a special algo at the msan control).
Once all these parameters are set the line will attempt to transmit data putting analog information into digital virtual buckets to transmit down the wire.
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If the line is having a bad day, the errors may rack up and quickly, so the modem has the capability to drop the connection if it sees multiple second counts whereby the entire payload was corrupted, but it won't do it until a threshold (count) is breached.
Lines change all the time, and at different times of day, as for example impulse noise increases at night owing to external influences, street lamp radiation, radio frequencies etc. and this is normally absorbed by the margin of the SNR, or put another way the noise margin. If databit transmission becomes difficult the MSAN control can increase the margin to enable the linedata to be "heard"... at the cost of linespeed.
To get back to your original point about error rates .... if your line sees high CRC checks (and resends) high HECS , header corrections ... it will absorb high levels of bandwidth and reduced throughput will ensue.
With FEC high figures simply shows interleave and block error correction is working, and it is demonstrating the rate of bits that are acknowledged as repaired. All lines will see some, and some more than others. The better the line and quality of the path, the less errors will be seen.
The DSL also has a further trick up its sleeve. If certain frequencies can't be used when negotiation takes place, it has the ability to swap databits from one virtual bucket to another bit-free part of the spectrum, that isn't being utilised for transmission, and in doing so maintains the throughput without wasting any bandwidth. That's bitswapping and is used frequently on longer, or errornous lines where "normal" databit transmission is difficult.
To put all this into perspective .... if your line starts to crackle .... high counts of errored seconds will be seen, and cyclic checking will go up, along with packet header correction. And as all this takes up overhead, throughput and data transfer depletes until the modem drops the connection.
On regaining a new re-negotiated connection, the dslam may according to line history and the "fault" that caused linedrop .... impose a higher level of interleave, via the DLM line algorithm. It can also reduce sync like it does at night, in order to negotiate a connection that is sustainable.
Crackle is probably the worst case scenario, as eventually the connection is bound to drop. But even high levels of impulse noise can destroy data packets, so if you have say poor extension wiring that absorbs REIN it will do the same, cut back the throughput.
Hope this helps.

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General QUestion about error handling

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