Table of Contents
LTU chassis
This is a common chassis which provides the usual -50v / 0v telecom power and can house different LTU.
BT LTU23c
I have two variants of these, both rack mounted in a 3U chassis, both are made by Telspec. I believe in normal use, there would be a two pronged jumper to link vertically, and for testing these could be removed and inserted horizontally to loop back.
As with the other pics I have, I would appreciate any feedback as to where they would have been used and what determines which LTU is used for which purpose.