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Timeline for CSU/DSU's and DSL modems

Current License: CC BY-SA 4.0

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Oct 27, 2021 at 4:18 comment added Ricky D4(aka. SF)/AMI vs. ESF/B8ZS. AMI is very old technology, even in the era of T1's. (the only AMI I ever saw was in voice T1's) T1's were commonly signaled over the exact same physical infrastructure as POTS/ISDN. (worst case the tech would have to hunt for suitable pairs) Well before the end of the T1 era, T1's ceased to be actual T1's -- they were (and are to this day in 2021) carried via HDSL single pair circuits. (the "smartjack" turns it back into a 4-wire T1)
Feb 24, 2019 at 16:33 comment added Eddie This is a really great answer.
Feb 24, 2019 at 9:16 history answered Zac67 CC BY-SA 4.0