Difference between Cabinet and Exchange

So, I might be being a little dumb here (which would not be the first time) but I feel I must be missing something and its probably in my understanding of the terms...
Exchange = The big building that houses all of the tech that occasionally members of the travelling community like to relieve of copper
Cabinet = The shiny green box at the bottom of my road that recently set up shop next to the dull old green box enabling me to receive FTTC
Providing the above is correct, why do all the "exchange checker" tools including BT's own measure the distance between my house and the exchange when calculating my potential speed? Surely the whole point of FTTC is that the fibre (with its massive capacity) is run to the cabinet... Isn't it (within reason) irrelevant how far I am from the exchange? 
If the speedchecker says "your X distance from your exchange and can expect a speed of Y" wont Y actually be quite different it I'm only actually 0.25X distance from the cabinet?
OR... am I just being an idiot?
Ross

You are right.  For FTTC, only distance from the cabinet matters.
The main estimator tool does take this into account.
On some of the tools you will see a figure called 'uplift' quoted.
This is the improved speed to expect from a connection to your cabinet rather than a connection to the exchange.
eg, you may have an ADSL speed of 18, an uplift of 3, and an estimated 54 for FTTC.
I don't remember any tool that actually quotes your distance from the cabinet.
For example: http://fttc-check.alc.im/  gives an uplift.
The telephone number based http://www.dslchecker.bt.com/adsl/adslchecker.welcome is informative.
~~~
Of course, as always with estimates, there is lots to go wrong.  They are estimates, not promises, despite many posters complaints about 'not being given what we were promised' or  'not being given what we are paying for'.
Most people find they are a bit above the estimate, but it looks as if as more people join FTTC, crosstalk between them will lower their speeds to near the estimate.  Some get much lower; aluminium lines is a particular bugbear for FTTC/VDSL which the estimator does not take into account.  And for a very few, the records are just screwed up and the estimate rubiish.

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