DS3 Coax..

Ejay Hire ejay.hire at isdn.net
Thu Apr 17 15:59:51 UTC 2003

I've had at around ~450 feet, but you have to change the LBO/Cable length in the CSU.

-----Original Message-----
From: Robert E. Seastrom [mailto:rs at seastrom.com]
Sent: Thursday, April 17, 2003 10:51 AM
To: Mike (meuon) Harrison
Cc: nanog at merit.edu
Subject: Re: DS3 Coax..

"Mike (meuon) Harrison" <meuon at highertech.net> writes:

> I need to run a DS3 across our parking lot.. Seriously. 
> What's the max length I can use coax for (I know, gotta use a GID), 
> and what's the best brand/type of coax I can use? It'll be through 
> innerduct.. Looking for some real world answers from people that do
> a LOT more of this than me..  (It might take 350-400 feet). 

The textbook limit is 450' for 735 cable.  I've had poor luck pushing
the limit, and don't know offhand if using some other flavor of 75 ohm
cable buys you anything.

Were I in your position, I'd have glass pulled and use a coax to fiber
media converter such as http://www6.adc.com/ecom/hier?NODE=OND68947,
http://www.versitron.com/DS3T3.html, or
http://www.rad-direct.com/DATASHEET/FOM-T3.pdf (the latter of which
I've used personally) on each end.  No, it's not the cheap way to do
it, but it eliminates ground loops and other such nastiness that can
ruin your whole day.


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