Re: Display station connection question/issue?

["Neil Palmer" <neilp@xxxxxxxxxxx>]

When I've had this occur in the past (pure twinax, no baluns & twisted 
pair) it was usually a polarity error where two consecutive twinax cables 
were wiring wrong, reversing the polarity as the signal reached the 
workstation in the middle, followed by another incorrectly wired cable 
reversing the polarity to the next workstation.  The one in the middle 
would not come up as the polarity is reversed, but the next one on the 
line would come up as the polarity was reversed again before reaching it.
Other possibilities often not though of are that it is possible to have 
cables that are too short. I don't know what the length would be when 
using baluns & twisted pair wiring, but with straight twinax the minimum 
cable length is approximately six feet.
Another possible issue is that I don't believe cable-thru (daisy chaining) 
is officially supported using baluns & twisted pair wiring.  It may work, 
it may not.  Usually I restrict this to daisy chaining one device using 
twisted pair wiring and baluns off the end of a twinax cable line.  The 
balun & twisted pair wiring is intended to be used from a twinax hub, 
connected to the twinax controller, in a star wiring configuration out to 
the terminals. 

...Neil





"Mark Allen" <mark.allen@fast-friends.com>
Sent by: owner-midrange-l@midrange.com
2001/02/14 10:58
Please respond to MIDRANGE-L

 
        To:     "MIDRANGE-L" <MIDRANGE-L@midrange.com>
        cc: 
        Subject:        Display station connection question/issue?


It's been a long time since I had to deal with this, so if someone can 
tell
me what I am doing wrong I would greatly appreciate it.


Configuration


DSP01-----Twinax cable-----PRT01--Balun--network
cable--Balun--DSP02--Balun--network cable--Balun--DSP03


What happens is that DSP03 gets a signon but DSP02 does not, it stays Vary
On Pending... All other devices are ok.
 Any ideas or is this not possible?


I have double and triple checked addresses, they are ok.  Have swapped
network cables with ones I know work and same result. Swapped baluns with
ones I know work, no diff....



Mark Allen
Director of MIS
Fast Friends, Inc.
(601) 888-4392 ext. 13
www.fast-friends.com


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