Comments inline..... wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > If we run 10 or 100 Half Duplex to a switch ... Is there a chance of a > collision occuring?
Yes, definitely. Anytime you run half-duplex there is a possibility of collisions. > If we then run 10 or 100 Full Duplex to a switch ... Is there a chance of a > collision occuring, besides late collisions, etc. If you are running full-duplex, there is no possibility for collisions. > From what I have read (or remember to have read): > When we run in full duplex we have seperate TX/RX wire pairs i.e the TX pair > on one side is wired to the RX pair on the other side and vice versa... > hence there should be no collisions and that's why there is no collision > detection mechanism in 100MB ... Right? You are correct that there is a dedicated TX and RX pair that are crosswired, and you are correct that is why there isn't collision detection.. but it has nothing to do with 100Mbps. When you put a switchport or NIC in full-duplex mode, the collision detection circuitry is bypassed, since it's not needed. However, this isn't a function of speed. > But the reason I ask this, is that yesterday I had a problem with a NIC, and > the options I had listed in the NIC Device Driver Software was this: 100Mb > Half Duplex. I thought 100Mb could only run in full duplex? However when we > run Half Duplex, the TX/RX occurs on then same wire pair so how does 100Mb > Half Duplex work if there is no collision detection mechanism for 100Mb? Yeah.... basically, you're making the mistake of assuming 100Mbps = Full Duplex, and it does not. Speed and duplex are independant of each other. Mike W. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=48899&t=48830 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
