On Wed, 7 Mar 2012, David Riley wrote:
It's probably used when a punchdown cross-connect
is
undesirable, since those usually aren't good for much more than 1 shot.
[citation needed]
I used to work for a small telco equipment manufacturer, and both we and
our customers (including national telcos in smaller countries) re-wired 66
and 110 blocks constantly.
Alexey