🚀 go-pugleaf

In <35e6319c.53011606@news.lakwod1.co.home.com>, blosser@home.com (Aaron Blosser) writes:
>On Fri, 21 Aug 1998 11:07:04 -0500, Daniel Erskine
><netsup75@edwardjones.com> said:
>
>>> Using existing 75ohm coax as if
>>> it was 50ohm coax (with F to BNC adapters) is asking for trouble.
>
>>  I'll inquire with my network staff for more research material, as
>>I'm curious as to why 75ohm cable would be that much of a problem?!?
>
>I wonder as well.
>
>For short runs of cable, I highly doubt that using 50ohm vs. 75ohm would
>make a difference.  That measurement is a measure of the cable's
>impedance over some distance (1000 ft?), so for a short bit of maybe
>50-100 ft, the difference *may* be neglible.
>
>Of course, this all depends on how senstive the receiving equipment is,
>and I can't make any claims to know how it would really affect the
>performance.
>
>The reason you *should* use properly rated cable is because with
>impedance matching you can achieve maximum power output.

With 10Base2 proper impedance matching is critical to prevent reflections 
-- which cause errors and false collisions.  However, for reasonably small
nets you should be able to use 75 ohm cable **IF** you use 75 ohm 
terminators.  The drivers and receivers should be able to tolerate the 
difference in current and voltage.

Dan Hicks
Hey!!  My advice is free -- take it for what it's worth!
http://www.millcomm.com/~danhicks