Question about Baud

[masked1]

How can the number of bits per second be increased, if the Baud is kept constant?

Any easy solution?

 

[gunrunnerjohn]

Yes, it can be changed. Rather than type the text, I'll just point you to a page explaining it. http://new.linuxnow.com/docs/content/Modem-HOWTO-html/Modem-HOWTO-20.html

 

[cmetz]

Baud is symbols per second, and a symbol can contain more than one bit, especially for interesting modern encodings. That is, bits/s = symbols/s * bits/symbol. How many symbols/s and how many bits/symbol you can get in a medium depends on your bandwidth, SNR, encoding, and some communications systems magic.

 

[ScottMac]

....And, to add to the above (correct) posts, symbols / bps don't include any compression numbers by default.

If you have a compressable file or traffic, and the modem's compression is enabled, you may get additional throughput. The amount of throughput will depend on the compressability of the file / traffic. If the file is already compressed (.zip, .rar, .tz, etc) the modem doesn't have much (if anything) it can further compress.

Compression is why you want to feed the modem at the highest DTE (PC-->Modem) speed it'll support. The data is buffered and compression is attempted, then the traffic is transmitted/received from/to the buffer. Hardware handshake is critical for all of this stuff to happen properly as well.

Good Luck

Scott

 

[Bloodstein]

Hmm....*recalls introductory networking paper*

Baud is, as i think of it, "waves/second"

Bps = bits/second

The only way you'd be able to increase bps, keeping baud constant, is to pump more information into each wave. Instead of saying 1 sine cycle = 1 bit, you say 1 phase change = 1 bit....or 1 amplitude change = 1 bit....etc...

*head hurts*

 

[dmcowen674]

I'll try one of my analogies for you.

You have a 5 Gallon Bucket (Think of that as the Modem Carrier Signal). Now you can fill it with say 25 Large cups of water or 150 small Dixie size cups of water. Both ways you filled the bucket with 5 gallons of water but you got more cups in using the smaller cup.