- #1
Newtons Apple
- 57
- 1
Hi everyone, I was reading up on bit rate vs Baud speed, and sort of got myself straight with it, but I have a few questions.. First of all why isn't the term Baud still used? We see devices and speeds quoted at their bits per second speeds, but is this just by convention now, or is baud speed someone irrelevant?
Second, just to check for myself, I went to Newegg.com, and looked up an arbitrary modem and looked for the specs. Below is a listing,
Channel Bonding: Up to 4
Channel Width: 200KHz / 400KHz / 800KHz / 1.6MHz / 3.2MHz / 6.4MHz
Modulation: QPSK, 8/ 16 / 32/ 64 / 128 QAM
Symbol Rate: 160 / 320 / 640 / 1280 / 2560 / 5120 Ksym/s
Maximum Data Rate: Up to 143 Mbps
Frequency Range: 5 to 42 MHz (edge to edge)
WIthout getting too weedy or into the nitty gritty, I'm not sure how the numbers here work out. Is Symbol Rate here, specified as Msym/s and Ksym/s the same as baud? wouldn't symbols per second be the same number as the baud? So for example, when bonding 4 channels as shown below... it can have a max of 5120 Ksym/s...meaning that it's 5120 baud?
So basically if the modulation is using say, 32-QAM, that's 32 different symbols, and each symbol can then be 160/320/640/1280,2560, or 5120 thousand? (because of the Ksym/s)?
Again I know it's probably an overly simplified look, but do I have the idea right?
Second, just to check for myself, I went to Newegg.com, and looked up an arbitrary modem and looked for the specs. Below is a listing,
Channel Bonding: Up to 4
Channel Width: 200KHz / 400KHz / 800KHz / 1.6MHz / 3.2MHz / 6.4MHz
Modulation: QPSK, 8/ 16 / 32/ 64 / 128 QAM
Symbol Rate: 160 / 320 / 640 / 1280 / 2560 / 5120 Ksym/s
Maximum Data Rate: Up to 143 Mbps
Frequency Range: 5 to 42 MHz (edge to edge)
WIthout getting too weedy or into the nitty gritty, I'm not sure how the numbers here work out. Is Symbol Rate here, specified as Msym/s and Ksym/s the same as baud? wouldn't symbols per second be the same number as the baud? So for example, when bonding 4 channels as shown below... it can have a max of 5120 Ksym/s...meaning that it's 5120 baud?
So basically if the modulation is using say, 32-QAM, that's 32 different symbols, and each symbol can then be 160/320/640/1280,2560, or 5120 thousand? (because of the Ksym/s)?
Again I know it's probably an overly simplified look, but do I have the idea right?