Cable Internet question

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towert7

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Dec 18, 2003
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Quick question. I know cable TV can be spliced so that diffrent TV's can watch diffrent TV shows.

I have a problem. My current max upload is around 32kb/s. Sometimes when something is uploading at 32kbs it will totally saturate "something", and all the other computers will loose internet access until the upload is finished. The only thing i could think of is that the cable modem is not full duplex.... and when something saturates the upload, no download can take place.

I was wondering, if i spliced my cable line for my Cable Internet, and bought two cable modems, would it help me out?

~Thanks
 
Cable internet is asymmetric. When you saturate the upload, your computer is unable to send an ACK for each packet received.
 
line splitters, etc, wouldn't help. The signal still has to get back onto one cable line somewhere, and you'd have collisions on top of saturation, probably slowing you down even further.
 
well, i don't think the actual "line" is limiting me to 32kbs upload...... that's why i thought it might be the cable modem. Eaither that or my ISP limits me to 32kbs upload....

Does an upload of 32kbs sound normal for basic cable internet?

I run a webserver, and when someone downloads a big file, it will stop the download of data to other computers. So i was wondering if getting a cable line + cable modem for the server, and another cable line + modem for the other computers... if that would help. (spliced that is).

Also, JTY, i dont' know much about networking and TCP/IP proticol ~_~... what does a ACK per packet do?

~Thanks
 
well, let's clarify. is that 32kbps or 32kBps, because the latter comes to about 256kbps which is quite reasonable for a capped upload cable setup.

As for ACK, it's simply the "ACK"nowlege response that must be sent to confirm packet receipt, and one major reason that saturated traffic in one direction slows the other direction to a crawl as well.

//edit: also, cable splitting (not "splicing") doesn't work the way you're thinking -- all TVs are able to see all channels simultaneously. An identical signal is going to each of them. That includes any signal from the cable modem, which is why I don't think you'll see any improvement whatsoever just by splitting and adding another modem.
 
Yes, that's a capital KB, sorry, i never learned the diffrence in the shorthand.

Anyway, i see what your saying, and that makes perfect sense. My ISP states that "Maximum download speed: 3.0Mbps. Maximum upload speed: 256Kbps."

With internet, is there 8 bits per byte, or 7?

if it comes out to 8bits per byte...... then that puts me right at the 32KB/s..... so i guess that's what i should have.

~Thanks again.
 
However, parity/CRC checks reduce efficiency. 8 bits/sec might equate to 10baud/sec, for example, which is why most communications equipment is technically rated by baud.

//edit: to clarify, baud is still technically bits. It's just not all end-result bits, but rather end-result plus transparent error control bits.
 
Actually 32 kbps is pretty much the norm. I get 30 kbps but I download at 340 kbps. I used to have 100 / 100 but my ISP changed that to accomodate for the demand of increased d/l speed. And your other computers shouldn't be "stopped" or anything. Even when I upload, the internet connection is still fine on other PC's (for me anyway).

-J.
 
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