Dial Up Modem Sounds: Telebit Trailblazer Packetized Ensemble Protocol (PEP)
Telebit (https://en.wikipedia.org/wiki/Telebit) introduced its proprietary Packetized Ensemble Protocol in the mid-1980s, which provided high speed, very resilient connections of up to 19200bps at a time when a fast common modem would be using V.22bis (2400bps).
Want to hear what happens after the speaker turns off? Check it out here: • Dial Up Modem Sounds After Connecting: Tel...
If there's something else you'd like to hear, leave me a comment and I'll see what I can do.
Originating modem: Telebit Trailblazer+
Answering modem: Telebit Trailblazer+
Call path is as follows:
Telebit Trailblazer+ -- FXS port on Cisco IAD2431-16FXS -- PRI port on VConsole 8BRI-U-MOD-2PRI -- Dialogic Diva 4BRI-8 in an Asterisk server -- VConsole 8BRI-U-MOD-2PRI -- Cisco IAD2431-16FXS -- Telebit Trailblazer+
The Asterisk server records the call, putting the caller in the left channel, and the answerer in the right.