The earliest protocol, in Oklahoma, was based on advice solicited by a state senator from a professor in the state's medical school.

Parts of the system communicate using the early four-phase asynchronous protocol.

Note the difference between this protocol, and an earlier (technologically unrelated) protocol named Microsoft ActiveSync.

Network administrators reading all of this may have reservations as they envision network broadcast storms and other unfriendly behaviors that were exhibited by earlier proprietary protocols.

The legacy of the early low-bandwidth protocols remains, though.

SDLC included much more powerful error detection and correction codes than earlier protocols.

BSC is an early link-level protocol used to connect two separate nodes.

AIM and ICQ are two early protocols.

An earlier protocol committed those who signed it to reduce sulfur dioxide emissions, another major component of acid rain, by 30 percent.

And those, again, can be supported in the case of downgrading your connection to an earlier protocol.