AT&T had analog MSF5000 repeaters on the microwave sites that had a 4 wire circuit going back to the regional #4ESS
that provided a switch based method of interconnection between repeaters.
When microwave had problems they used their radios and had a private two-digit dialing plan to get to the destination
repeater. I saw DLR/CLR (design layout record/circuit layout record) that was left on a couple of sites that showed
everything including the dialing plan.
In a way, this could be described as a VERY EXPENSIVE predecessor to IRLP.
MCI had a similar nationwide system with UHF repeaters but I don't know if or how it was tied into the switched network. Anyone from MCI on this list? Our company's warehouse is a former MCI microwave hub - I'd love to pick your brain about some of the equipment and facilities we inherited.
I grew up in a telco family as well. Some of my earliest memories include visiting CO's in northeastern and central Pennsylvania with my dad.
--- Jeff WN3A
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