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Author Topic: Strange DMT snrm Traces  (Read 2087 times)

GunJack

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Strange DMT snrm Traces
« on: October 08, 2010, 01:59:41 PM »
Guys,

out of curiosity, I wondered if anyone had seen traces like this from DMT before, and knew what caused them ??

Both times this happened, I had no loss of sync, no change of IP address, and from what I can remember no change of backhaul point. As you can see from the dates, they're also a fair way apart (i kept the first one coz it was odd, and the second I picked up on as I'm monitoring my line 24/7 after the recent switch to ADSL2+)

One thing I thought of was maybe it was the DMT equivalent of when RouterStats doesn't get the router input and the trace dives, but it seems to happen over too long a period. The other was some kind of switchover/routine/whatever within the DSLAM.

Anyone got any ideas ???

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roseway

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Re: Strange DMT snrm Traces
« Reply #1 on: October 08, 2010, 03:32:13 PM »
Are you referring to the dip at 657 kHz? That's the frequency of Radio Wales (Wrexham) and Radio Cornwall (Bodmin).
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  Eric

GunJack

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Re: Strange DMT snrm Traces
« Reply #2 on: October 08, 2010, 04:39:38 PM »
Hi eric,

no, I'm not referring to the dreaded 657kHz dip - I'm from Wrexham and am fully aware I'm pretty much on top of the transmitter site  >:(

No, it's the wierd flatlining of the snrm trace, followed by the dip, then more flatlining, before settling down to normal behaviour again. The third graph on each screenshot. Looks like a "T" on the snrm trace. 
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GunJack

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Re: Strange DMT snrm Traces
« Reply #3 on: October 08, 2010, 04:43:27 PM »
Oh, by the way, do you still have that link to the radio mast sites?? Thought I'd saved it, but can't seem to find it now :(
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GunJack

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Re: Strange DMT snrm Traces
« Reply #4 on: October 08, 2010, 04:51:25 PM »
ok, just found it again  :-[
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