Dial Up Modem Handshake Sound - Spectrogram

RFlaggsays...

I wonder which baud this is at? From the pic (http://i.imgur.com/5Dq6K2U.png) the main video description points to, I'd guess 3200 or Modem 28.8... The good old days of connecting to Software Connections BBS and Rusty and Eddys...

Wasn't there a show, where some geeks are trying to debate certain baud connection sounds in one episode?

antsays...

I know it's not 26400, 28800, and 31200 since my dial-up modems don't sound like those due to old crappy phone systems and areas. Maybe 53K?

RFlaggsaid:

I wonder which baud this is at? From the pic (http://i.imgur.com/5Dq6K2U.png) the main video description points to, I'd guess 3200 or Modem 28.8... The good old days of connecting to Software Connections BBS and Rusty and Eddys...

Wasn't there a show, where some geeks are trying to debate certain baud connection sounds in one episode?

cluhlenbraucksays...

2400 or 2600 baud modems were the ones I used back in the BBS days.
Scariest part is when someone picked up the phone "hello?"

lets play some LORD

antsaid:

I know it's not 26400, 28800, and 31200 since my dial-up modems don't sound like those due to old crappy phone systems and areas. Maybe 53K?

antsays...

2400. 2600 was for Atari video game consoles and magazines. I was there.

IIRC, 2400 didn't have error corrections so you can see garbled data and easily get disconnected from line noises (e.g., "hello?")!

cluhlenbraucksaid:

2400 or 2600 baud modems were the ones I used back in the BBS days.
Scariest part is when someone picked up the phone "hello?"

lets play some LORD

antsays...

I agree. In U.S., we can go only go up to 53K due to FCC rules. I wished mine could go that fast. Mine never did and still doesn't! Stupid outdated GTE/Verizon phone systems with no DSL and FIOS for my neighborhoods!

Nexxussaid:

I believe this is a 56k modem, because of the ramp up at 22 secs.

coolhundsays...

Since when was the handshake ever affected by the modems baudrate? That would have made it impossible for different modems to connect to each other.

RFlaggsaid:

I wonder which baud this is at? From the pic (http://i.imgur.com/5Dq6K2U.png) the main video description points to, I'd guess 3200 or Modem 28.8... The good old days of connecting to Software Connections BBS and Rusty and Eddys...

Wasn't there a show, where some geeks are trying to debate certain baud connection sounds in one episode?

RFlaggsays...

The handshake includes the baud rate of the modem being called (well both really, but it starts on the one being called). I know the sound changed depending on which modem I used (I don't recall if it changed much from which BBS I called, as it was too long ago to remember that much detail).

The initial sequence is this (as best as I understand it):

1) The calling modem waits for an answer, the called modem (Answer) will send a carrier telling the calling modem it is ready and the calling modem sends a carrier back. Note, sometimes the Answer may send a few just in case the Caller doesn't understand the first one for some reason. In theory that should prevent a Caller from sending signals to voice line, in practice the Caller gets impatient and tries to start the call itself...

2) The Answer will send all the rates it knows. The Caller will respond in kind. They agree which rate to use, and line quality might make for even odder rates...

Here's a link to describe it, look at Once again: Making a connection, http://www.myhome.org/pg/modem.htm

coolhundsaid:

Since when was the handshake ever affected by the modems baudrate? That would have made it impossible for different modems to connect to each other.

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