Submitted by Alan Chew

Tucson FSS (TUS), Arizona, 1966.
The Line Switching Unit (LSU) cabinet can be seen built into the wall.  Each piece of teletypewriter (TTY) equipment was wired to an LSU which enabled assigning (connecting) it to any TTY circuit.  The LSU rack consisted of mutiple LSU's. 

Person is unknown.

 

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