RE: Twinax Hub

Three observations:

1. Some twinax hubs can be configured to use various pin arrangements; the
most common I've seen is the 4/5 pair (the middle pair in a RJ45 plug).
There is a jumper switch inside our units (I forget the brand) that controls
whether pair 4/5 or 3/6 (?) is used.

2. However you wire your hubs (4/5, 3/6, etc.), make sure your baluns are
wired the same way.

3. If you're serious with cable runs (more than a few feet), use CAT5
network cable. It's already rated to 100m (~320 feet), and most units should
support 500 foot runs over network grade cable. Since twinax is low-speed,
you might get away with using CAT3 if you find it less expensive than CAT5.

HTH,
Loyd

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of PaulMmn
Sent: Monday, December 19, 2005 7:07 AM
To: Guy Terry
Cc: midrange-l@xxxxxxxxxxxx
Subject: Re: Twinax Hub

When we were using Twinax hubs (StarTek panels), we could only plug 
in RJ11 plugs; the other end was RJ-45 and plugged into our 
distribution panels.  On these panels only the center 2 positions of 
the plugs were used.  I don't think it mattered if the cables were 
crossover or not, but the center 2 positions of the plugs was the key.

--Paul E Musselman
PaulMmn@xxxxxxxxxxxxxxxxxxxx




>Hey all
>
>We've got a Twinax Hub (an NBase 5250 Active Star) that works with 
>RJ-11 cables. I can physically plug RJ-45 cables in, but I can't get 
>any twinax screens to work unless I'm using RJ-11. The RJ-11 cables 
>I have are way too short for what I need, and I can't make up any 
>new ones. I can make up RJ-45 - is it likely that the hub simply 
>doesn't work with RJ-45, or is there just a different way of wiring 
>it up?