My Virgin Media 50M line has had an intermittent fault for months. 4th engineer visit today, the engineer opened up the on-street cabinet and told me he was moving me to another "level" (physically a port, presumably a different frequency) as Virgin had put a "tab" on mine - a small round adaptor screwed onto the port that causes the upstream to
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I'm sure El Reg would love to hear about this...
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What it might be is a type of thermal cut out device.
As the laser light produces heat, more data is esentially more light and more heat, so while the connection might deal OK with burst of 50Mb, heat can build up that needs dispating during lesser usage. Prolonged usage my take the heat up to a point where it really needs to cool so rather than throttle it's cut out ( Or more likely a thermal cut out is a lot cheaper and could be considered justified as a safety feature )
This is based on seeign a connection where I work have a ( light ) attenuator not put back when it was moved by BT engineers. Caused all sorts of intersite problems by dropping the connection due to thermal overload, and took quite some time to pin down to that.
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Also, aside from the fact I'm not sure more data really = more light/heat, it would as happily cut out when idle as when I was downloading large files, and it's not like I was hammering the 50M line even when I was - there were usually bottlenecks elsewhere.
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http://feeds.feedburner.com/VirginMediaHighDefinition
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