[c-nsp] DS3 Length over RG-6 or RG-59

[Peder]

Does anybody have a good rule of thumb as to what type of coax to use for
DS3 over various distances?  I know it has to be 75ohm, but have read it can
be RG-59 or RG-6.  Also, on the RG-59 I have seen solid core and braided.
We have to run a cable about 250' to the telco equipment thru a messy
ceiling, so we only want to do it once with the correct cable.  In the lab,
we just use cheap RG-59 but I don't know if it will have issues over a
distance of 250'.  Thanks.

Peder