Re: Wire wrap

From: Joerg (notthisjoergsch_at_removethispacbell.net)
Date: 06/26/04 

Date: Sat, 26 Jun 2004 19:13:23 GMT

Hi James

>... In practice you rarely had more than 1 wire in a contact because unlike wire wrap, you could continue on to the next connection point with the same wire. ...
>
Yes, in that case IDC can be quite reliable. But with prototyping this
became difficult. Oh, I forgot that I also need the strobe signal over
there...

Double placement is a concern and telecoms usually do not allow it. Even
the manufacturers of the 66 and 110 blocks strongly discourage that.

>... One thing that tended to help keep the wires in the contacts was that we would install a clear plastic shield on the wire side of boards once prototyping was finished. I've also seen the plastic shields used with wire wrap boards to minimize the possibility of bending the wrap tails and creating shorts. ...
>
>
Another device we used with IDC where combs made out of soft plastic.
They had barbs at the end of the fingers so wires would have less of a
chance to slip out. These comb rows were affixed to the board before
starting the wiring job. This also created a very organized appearance.

The IDC technology didn't last long at the companies I worked for. Wire
wrap kind of vanished towards the end of the 80's but had been used a
long time by then. IDC was often tried out as "the new thing" but I have
only seen it for a couple years or so. Then it all went to direct layout.

Regards, Joerg

http://www.analogconsultants.com

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