One other important point about 415 cards and tie lines:

Before Caller ID when your phone rang you had no idea who was calling. Unless you had a tie line/hot line. Then you knew exactly who was calling.

On Wall Street traders "turrets" (giant key phones) almost all the circuits were hot lines. This way when the phone rang the trader could decide if he wanted to put his current call on hold or ignore the incoming call.

Same goes for corporations. Was the factory/headquarters/whoever calling or was it.......someone?

Notice the name: HOT line. Someone important. Someone who was willing to pay the freight for mileage charges so you knew who was calling.


Sam

Last edited by Silversam; 03/23/14 10:42 PM.
"Where are we going and why are we in this hand basket?"