a phantom signal source
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Posted by Dave Houston on December 6, 2007, 8:06 am
Please log in for more thread options mode power supplies (SMPS) spontaneously generating valid X-10 PLC codes. Bruce Robin sent a noisy SMPS (in a charger) that was blocking X-10 activity to Jeff Volp who ran some tests. AFAIK those tests failed to show any spontaneously generated X-10 codes. There was a recent thread on Smarthome's Insteon forum that, in part, discussed phantom PLC codes being logged that went away when a CFL (with an apparently noisy SMPS) was removed from the mix. Further investigation found that the source of the apparently spontaneous codes was actually an ACT CR134 coupler/repeater. When it was replaced with a plug-in passive coupler, the phantom codes disappeared. Another factor was that the phantom codes only appeared after a valid Status Request was transmitted. http://davehouston.net http://davehouston.org http://tech.groups.yahoo.com/group/roZetta/ roZetta-subscribe@yahoogroups.com | |||||||||||||||||||
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Posted by Jeff Volp on December 6, 2007, 9:41 am
Please log in for more thread options charger: http://jeffvolp.home.att.net/x10_info/x10_Cellet_noise.htm However, if you look at the 3rd photo down, you can see the ESM1 giving a solid "X10 Good" indication when the charger was loaded with 20 ohms. I was testing how well the XTB-IIR AGC rejected the noise, and I did not see it accept the signal as valid even though the ESM1 seemed to be happy with it. Jeff | |||||||||||||||||||
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Posted by Dave Houston on December 6, 2007, 10:15 am
Please log in for more thread options The ESM1 does not do a thorough manchester check but only counts the number
of 1 bits and 0 bits that follow a 1110 (presumed to be a start code). Thus 11101111111111100000000000 is only one of many non-X10 sequences that might cause the X10 Good LED to illuminate. >I did not monitor X10 line traffic while testing the Cellet cellphone
>charger: > >http://jeffvolp.home.att.net/x10_info/x10_Cellet_noise.htm > >However, if you look at the 3rd photo down, you can see the ESM1 giving a >solid "X10 Good" indication when the charger was loaded with 20 ohms. I was >testing how well the XTB-IIR AGC rejected the noise, and I did not see it >accept the signal as valid even though the ESM1 seemed to be happy with it. > >Jeff > >>A while back there was a thread here about the possibility of noisy switch
>> mode power supplies (SMPS) spontaneously generating valid X-10 PLC codes. >> Bruce Robin sent a noisy SMPS (in a charger) that was blocking X-10 >> activity >> to Jeff Volp who ran some tests. AFAIK those tests failed to show any >> spontaneously generated X-10 codes. >> >> There was a recent thread on Smarthome's Insteon forum that, in part, >> discussed phantom PLC codes being logged that went away when a CFL (with >> an >> apparently noisy SMPS) was removed from the mix. Further investigation >> found >> that the source of the apparently spontaneous codes was actually an ACT >> CR134 coupler/repeater. When it was replaced with a plug-in passive >> coupler, >> the phantom codes disappeared. Another factor was that the phantom codes >> only appeared after a valid Status Request was transmitted. >
http://davehouston.net http://davehouston.org http://tech.groups.yahoo.com/group/roZetta/ roZetta-subscribe@yahoogroups.com | |||||||||||||||||||
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> mode power supplies (SMPS) spontaneously generating valid X-10 PLC codes.
> Bruce Robin sent a noisy SMPS (in a charger) that was blocking X-10
> activity
> to Jeff Volp who ran some tests. AFAIK those tests failed to show any
> spontaneously generated X-10 codes.
>
> There was a recent thread on Smarthome's Insteon forum that, in part,
> discussed phantom PLC codes being logged that went away when a CFL (with
> an
> apparently noisy SMPS) was removed from the mix. Further investigation
> found
> that the source of the apparently spontaneous codes was actually an ACT
> CR134 coupler/repeater. When it was replaced with a plug-in passive
> coupler,
> the phantom codes disappeared. Another factor was that the phantom codes
> only appeared after a valid Status Request was transmitted.