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Post by TB141 on Feb 13, 2016 10:45:24 GMT
Has anyone else noticed this? The clock on the ETM is about 30 seconds faster than the MDT? I know it's a relatively minor issue but it's been really bugging me.
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Post by M1104 on Feb 13, 2016 11:50:59 GMT
Has anyone else noticed this? The clock on the ETM is about 30 seconds faster than the MDT? I know it's a relatively minor issue but it's been really bugging me. Which one is likely to be correct?
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Post by TB141 on Feb 13, 2016 14:05:13 GMT
No idea. I'd always assumed the ETM took the information from the MDT.
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Post by Deleted on Feb 13, 2016 17:45:29 GMT
What is ETM and MDT?
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Post by RT3062 on Feb 13, 2016 17:55:21 GMT
ETM is the ticket machine MDT is ibus unit
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Post by TB141 on Feb 13, 2016 18:42:38 GMT
ETM - Electronic Ticket Machine MDT - Mobile Data Terminal
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Post by Paul on Feb 13, 2016 19:17:46 GMT
Has anyone else noticed this? The clock on the ETM is about 30 seconds faster than the MDT? I know it's a relatively minor issue but it's been really bugging me. Which one is likely to be correct? Yeah, it's one of those silly little things that really annoys me! I'm sure I remember being told the ETM is the correct one
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Post by londonbusboy on Feb 13, 2016 23:08:22 GMT
This has been bugging me too!! ive been going by the MDT's clock
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Post by Deleted on Feb 14, 2016 0:26:51 GMT
Yes I notice it all the time. Its about time TFL stop wasting money on a vanity project (NBFL) and replace these stupid 1990's Ticket Machines, which will soon end up with more redundant buttons than operational buttons.
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Post by VPL630 on Feb 14, 2016 8:17:05 GMT
Has anyone else noticed this? The clock on the ETM is about 30 seconds faster than the MDT? I know it's a relatively minor issue but it's been really bugging me. It drives me nuts, I always go off the MDT
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Post by londonbusboy on Feb 14, 2016 10:57:58 GMT
Yes I notice it all the time. Its about time TFL stop wasting money on a vanity project (NBFL) and replace these stupid 1990's Ticket Machines, which will soon end up with more redundant buttons than operational buttons. Very true yesterday i had 2 ticket machines that froze
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Post by Madstuntman on Feb 14, 2016 11:13:41 GMT
I believe the ETM gets it's time from the module, which in turn gets its time from the garage terminal when you sign the module on.
I've got in buses that have been VOR for a while and fresh out of engineering, the time on the ETM can be very wrong with the MDT being correct. the ETM would quickly correct itself when I put the module in.
I believe the MDT is correct getting its time from the GPS or the radio signal somehow (not exactly sure which and how it would work) much like the radio controlled clock I have at home which gets it's time from the GMT time signal.
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Post by snoggle on Feb 14, 2016 11:36:46 GMT
I believe the ETM gets it's time from the module, which in turn gets its time from the garage terminal when you sign the module on. I've got in buses that have been VOR for a while and fresh out of engineering, the time on the ETM can be very wrong with the MDT being correct. the ETM would quickly correct itself when I put the module in. I believe the MDT is correct getting its time from the GPS or the radio signal somehow (not exactly sure which and how it would work) much like the radio controlled clock I have at home which gets it's time from the GMT time signal. I am not a bus driver so what follows may be garbage! From my limited understanding of how I-Bus works and communicates then Madstuntman's explanation makes sense to me. The only bit I'm not sure about is that I understood the ETM and Oyster Reader are in almost real time communication via the radio system to allow contactless payment card "warn lists" to be regularly updated so fraudulent card use can be prevented. I would have expected the time to be regularly updated via that process and not necessarily via the module. However I may be misunderstanding how things work.
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Post by Paul on Feb 14, 2016 18:18:42 GMT
Just asked my dad about this and he said he was speaking to someone at PD about it. The ETM is radio linked to the National Time Signal while the MDT is satellite linked to it which carries an inherent time delay. I'm not sure why the discrepancy has only recently arisen but the true time is the one on the ETM
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Post by TB141 on Feb 14, 2016 19:18:46 GMT
Very interesting. You're a clever bunch ain't ya? I wonder then if route performance figures come from the GPS data. On low frequency routes, even 30 seconds will make all the difference when it comes to a bus meeting it's target of 2 early/5 late.
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