Sigh. You are just being an ass. The point was that we fed the same level we would have on a dedicated pair, in spite of the DC on the pair. The equipment was designed well enough that it didn't saturate the transformers on either end. It was within Telco specs for level and frequency response, as well.
The point is that no one in their right mind expect a phone line to be THAT quiet. OTOH, you might. I recall you bragging about recording lots of phone calls in a C.O. at one time. What did that have to do with PSTN?
Then explain the difference between feeding a phone line to a computer for the OP and feeding a phone line to a computer for talk radio.
Because I have no way of knowing the level they actually supplied to the Army on that line. Long distance calls were all loud and clear, while the net feed sucked.
yawn. You sound like the typical T&R guy who doesn't give a shit when your feed is down.
Of course you don't. The circuits performed the same function, but at a higher level of performance. Something well beyond what was used in telco. Telco doesn't use redundant systems and combine the outputs to improve reliability. But then, people rarely were foolish enough to depend on the telco to provide mission critical communications if anything else was available.
Yawn.