Hi, I am not too sure about the presence of this jamming signal in practical world, but I was taught it exist during my basic networking course. Tace On Thu, 8 May 2003 11:07:33 Darrell A. Escola wrote: >On Thu, May 08, 2003 at 01:19:48PM +0200, Hagen Paul Pfeifer wrote: >> * Tace | 2003-05-08 07:52:50 [+0700]: >> >> >Hi, >> > What's Ethernet Jamming Signal? >> >> Sorry, my failure! >> >> CSMA/CD - Jamming Signal >> >> When a controller detects a collision on the wire he sends a jamming signal. >> All nics in the segment now realize that a collision take place. >> I hope that some nics provide some statistic informations!? >> >> >Tace >> >> Hagen >> >> -- >> Universe.SYS corrupted. Reboot? [Y/N] >> - >> : send the line "unsubscribe linux-net" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > >My understanding of CSMA/CD collision detection is that NIC's operating in >half-duplex mode listen while transmitting, detecting a foreign transmission >during that time as a collision - any other NIC's transmitting during that >period should likewise detect the collision. Any full-duplex links _should_ >be unaffected, depending on switching mode (cut-through, fragment-free, >store-and-forward) - switches should buffer the frames, dropping invalid >frames. > >I do not believe there is a "jamming signal" - frames involved in a >collision will be damaged and dropped. > >-- >Darrell A. Escola, CCNA, Linux+ >- >: send the line "unsubscribe linux-net" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html > ____________________________________________________________ Get advanced SPAM filtering on Webmail or POP Mail ... Get Lycos Mail! http://login.mail.lycos.com/r/referral?aid=27005 - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
