Date   : Wed, 29 Aug 2007 14:28:40 +0100
From   : chris.priest@... (Chris Priest)
Subject: Econet oddities

Chris Priest wrote:
> Rob wrote:
>> It sounds like you've done your best, but it is almost certainly the
>> wrong cable; econet uses a differential signal like ethernet 10baseT
>> rather than a signal-to-ground like RS232/432 seral.  For this to work
>> reliably at speed, the cables in the pair are supposed to be twisted
>> together, and always kept the same length.
>>
>> Also, whats in the cables from your sockets to the Beebs?
>>
>>   
>
> Cable from Socket to Beeb is the same stuff as used for the socket 
> boxes. 4 core + screen.
>
>>  
>>> The cable is shielded, the shield being used as earth.
>>>     
>>
>> Make sure you only connect shields at *one* end to avoid creating hum
>> loops ...
>>
>>   
>
> I was under the impression that you had to connect the shield at all 
> boxes, apart from you didn't need to connect to each of the earths 
> inside the box?
>
>> I think mine is a homemade one (not by me) using a 555 ... I really
>> need to trace it out sometime & post a schematic..
>>
>>   
> Would be interested to see it if you get time to map it out.
>
> Cheers
> Chris
>
>> Rob
>>
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>>   
>
>