In article ,
Dave Liquorice wrote:
Cross normalling is slightly more descriptive to an operator than
double innered which is the (BBC) engineering term. But it is an ITV
term.

But "double innered" is not the same a "normalled", I can see that is
slightly simpler to understand though. Double innering needs two plugs
to be inserted to isolate the source and destination, you need to
"jack out" the unwanted inner.

Cross normalled is the same as double innered - ie two jacks which are
both listens until both are used when they both become break jacks. At one
time, you'd have a two listens and two breaks. With cross normalled, it
allows you to isolate both source and destination with two less jacks for
almost all applications.

Normalling is broken with just one plug.

Yup.

Gawd this is ancient stuff I had to draw it out, don't often see
double innered stuff these days or listen/source/destination (or
something like that). These days why use 2 or 3 sockets when one will
do...

Still in use, though. Not everything is digital.

And you tend to refer to plugging up a jackfield rather than jacking
it up which sounds slightly rude.

B-) Plugging up yes, but you "jack out" double innering.

Either would do.

--
*Never underestimate the power of very stupid people in large groups *

Dave Plowman London SW 12
RIP Acorn