Sound of Dial-up Internet Modem Days by Russell John 🇧🇩

What the sound means: 0:00-0:05: Dial tone and modem dialing number (basically the modem automatically dials the number of the ISP) 0:06-0:07: MPS and ITM configuration between calling and receiving modem (essentially both modems listing their capabilities and specifications to each other. 0:07-0:09: (FSK) (Frequency shift keying) data communication between the modems in order to agree on a mode of communication (the calling modem lists its protocols, location, manufacturer, etc. and then the receiving modem acknowledges the connection and suggests a protocol then the calling modem responds to the acknowledgment) 0:10-0:11: (FSK) transmission between modems: Receiving modem disabling echo suppression (echo suppression is in place in order to prevent feedback when a human talks on the phone but it will mess with data being transmitted on dial-up, therefore it is disabled) 0:11-0:13: (FSK) transmission between modems: Receiving modem lists its available modulation modes (repeated 6 times) and then calling modem responds with its available modulation protocols (repeated 3 times) (all this is: is both of the modems explaining their capabilities to each other in regards of how that data is actually transmitted) 0:13 1st half:(DPSK) both modems explain their transmission rates, transmission power, and their clock source (essentially both modems figure out how fast they can transmit data) 0:13 2nd half - 0:14 1st half(the sound that sounds more like a buzzer): Both modems send and receive probing signals (basically each modem tests how the other sounds over the telephone wires as telephone wires vary on a person-to-person basis) 0:14 2nd half: (DPSK) both modems communicate how they sounded over the telephone lines and they communicate what different frequencies, symbol rates, offsets, transmission power, and whether or not they heard each other properly so that they can use full-duplex communication (both modems essentially reconvene after the probing tests and explain caveats between them and if they heard each other well enough) 0:15-0:17: receiving modem transmits random data over the lines so that the calling modem can see how the receiving modem sounds over the lines 0:17-0:21: calling modem transmits random data over the lines so that the receiving modem can see how the calling modem sounds over the lines 0:21-0:23: Both modems transmit data at the same time so that they can see how they sound when they are both talking at the same time 0:23: Connection between modems successfully established! 0:24-0:26: data being transmitted and received over the internet by the computer connected to the modem 0:26: Receiving modem disables speaker

Genre

Technology