[chbot] Choc Fish Challenge #5

[Synco Reynders]

To clarify: Wire resistance, battery voltages, cross-talk, ... can be ignored.


On 5 September 2011 11:00,  <m.beckett at amuri.net> wrote:
> yes
> Got it to 2km after a double check.
>
> I do understand the points raised re line loss etc.
> Only comment is that this is NOT a paired cable, so in theory the
> resistance doesn't apply.
> Also it was never specified what voltage the battery was (48 is
> available usually).
>
> We'll take that under consideration for the 300 wire cable.
>
>
> Mark
>
> On Mon, 5 Sep 2011 10:50:32 +1200, Synco Reynders wrote:
>> Hello,
>>    To clarify the ends do not need to be undone, just labeled.
>> Anyone able to beat 4km?? (since it is possible :-)
>> /s
>>
>>
>> On 5 September 2011 09:33,  <m.beckett at amuri.net> wrote:
>>> Gents
>>> We have had a hack at this at work.
>>> We work out 4km required to label both ends.
>>>
>>> If you want the jumpering undone so they become individual, it needs
>>> a
>>> 5th km.
>>>
>>> We can explain how, but its a long email, and the phones keep
>>> ringing.
>>>
>>>
>>> Mark
>>>
>>>
>>> On Sun, 4 Sep 2011 21:55:00 +1200, Synco Reynders wrote:
>>>> Hi Mike,
>>>> I see you're a fit (or going to be a fit) guy after doing this...
>>>> Cos
>>>> the next job your the boss has is a 300 wire cable <very subtle
>>>> hint>
>>>> :-).
>>>> Nice try, but you may need a bit more optimisation.
>>>> /s
>>>>
>>>> On 4 September 2011 21:44, Michael Field <hamster at snap.net.nz>
>>>> wrote:
>>>>> I've made a start.... this is flawed (at the end of step 2 we
>>>>> haven't
>>>>> definitively identified the bundles at the far end) but might
>>>>> inspire
>>>>> somebody. My guess is that you need to use uneven wire counts in
>>>>> each bundle
>>>>> you can glean more information....
>>>>>
>>>>> But I'm pretty sure that the divide into three groups and wiring
>>>>> up
>>>>> two is
>>>>> the correct starting point...
>>>>>
>>>>> Mike
>>>>>
>>>>> First step
>>>>> Separate the cables into 3 bundles of 40, short all cables in the
>>>>> bundle
>>>>> together Connect each end of the battery terminals to one bundle
>>>>> of
>>>>> 40
>>>>> (leaving one bundle unconnected).
>>>>>
>>>>> Walk to the other end.
>>>>>
>>>>> Connect light to a random wire, and try to get a circuit by
>>>>> connecting to
>>>>> each of the other wires. If nothing lights, try another wire.
>>>>>
>>>>> When you get a light, you will then be able to move one jumper
>>>>> around to
>>>>> find which 39 other wires are also in that bundle. Do the same
>>>>> with
>>>>> the
>>>>> other terminal of the bulb.
>>>>>
>>>>> You will then have three bundles of 40. One you will be know more
>>>>> about
>>>>> (it's not connected at the other end) but you won't know which
>>>>> bundle is
>>>>> connected to the positive terminal, and which is to the negative
>>>>> (oh
>>>>> for an
>>>>> LED or meter).
>>>>>
>>>>> Second step
>>>>> For each bundle of 40, divide it into two sets of 20, and jumper
>>>>> together.
>>>>> Jumper two bundles of 20 from one of those connected to one of the
>>>>> battery
>>>>> terminals together, jumper each bundle of 20 from the unconnected
>>>>> pair to a
>>>>> bundle of 20 that is connected to the battery.
>>>>>
>>>>> Walk back to the other end
>>>>>
>>>>> Use the bulb in series with the battery to separate the starting
>>>>> end
>>>>> into 6
>>>>> bundles of 20.  you will also be able to work out which bundle was
>>>>> connected
>>>>> to which battery terminal, accurately identifying both ends of the
>>>>> bundle.
>>>>>
>>>>> Label each cable.
>>>>>
>>>>> Step 3 & 4
>>>>> Deal out the cables again 3 or 4 from each bundle of 20, into new
>>>>> bundles of
>>>>> 40. Repeat. The above process, walking another two trips
>>>>> This will allow you to divide the cables into 36 bundles of three
>>>>> or
>>>>> four.
>>>>>
>>>>> Step 5 & 6
>>>>> Deal out the cables again bundles of 3 or for , into new bundles
>>>>> of
>>>>> 40.
>>>>> Repeat. The above process, walking another two trips
>>>>> This will allow you to identify individual cables.
>>>>>
>>>>>
>>>>> On 4/09/2011 7:48 p.m., Synco Reynders wrote:
>>>>>
>>>>> As I was pulling through some wires today I remembered this
>>>>> classic
>>>>> challenge...
>>>>>
>>>>> A 120 wire cable has been laid firmly underground between two
>>>>> telephone exchanges located 1km apart.
>>>>> After the cable was laid it was discovered the individual wires
>>>>> are
>>>>> not labeled. There is no visual way of knowing which wire is which
>>>>> and
>>>>> thus connections at either end is not immediately possible.
>>>>> As trainee technician your boss has asked you to sort it out and
>>>>> identify / label the wires at both ends. You only have a battery
>>>>> and
>>>>> light bulb to test continuity and tape/pen for labeling the wires.
>>>>>
>>>>> What is the shortest distance in kilometers you will need to walk
>>>>> to
>>>>> correctly identify and label each wire?
>>>>>
>>>>>
>>>>>
>>>>>
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>>>>>
>>>>
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>
>
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