Hum… thinking about it more.   The phone drop would have originally been two 
parallel conductors with insulation.  They were not originally twisted pairs in 
the phone network and placing the two wires flat next to each other uses the 
least insulation material.

https://patents.google.com/patent/US3134845A/en?q=telephone&q=drop&q=cable&before=19700101&page=3
 
<https://patents.google.com/patent/US3134845A/en?q=telephone&q=drop&q=cable&before=19700101&page=3>



Mark

> On Mar 22, 2017, at 10:19 PM, Mark Radabaugh <[email protected]> wrote:
> 
> It copies the standard for telephone drop cables and works with the same drop 
> wire clamps that have been used for years.  As to why telephone drop cable is 
> flat probably requires research into old telco practices.   Given the amount 
> of research Bell Labs did over the years I’m sure there is a very good reason.
> 
> 
> Mark 
> 
>> On Mar 22, 2017, at 9:37 PM, Colin Stanners <[email protected] 
>> <mailto:[email protected]>> wrote:
>> 
>> The standard is one buffer tube at the middle, with one strength member on 
>> each side. Maybe the additional strength members of a rounded cable 
>> increases cost but doesn't help strength? Or as flat cable takes up less 
>> space on the reel?
>> 
>> On Wed, Mar 22, 2017 at 8:32 PM, Adam Moffett <[email protected] 
>> <mailto:[email protected]>> wrote:
>> Why are fiber drop cables flat?  
>> 
> 

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