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| TortGuy 2004-02-08, 8:24 pm |
| As far as Carrier Sense is concerned, does each station continuously listen for traffic on the medium to determine when gaps between frame transmissions occur? I've been of the impression that a station only listens when it's ready to transmit.
I know this is a minor detail, but I want to understand this as best I can.
Thanks,
TG | |
| Boulware5 2004-02-08, 8:43 pm |
| I also thought a station only listens when it's ready to transmit. | |
| TortGuy 2004-02-08, 10:07 pm |
| That's what I've thought all along and it only makes sense to me - why use resources, while probably few, to monitor the wire all the time?
I've been reading on the Cisco site (URL below) and under the URL is the quote off the site - note the word "continuously".
http://www.cisco.com/univercd/cc/td...et.htm#xtocid10
Carrier sense—Each station continuously listens for traffic on the medium to determine when gaps between frame transmissions occur.
Hope I'm not getting bad info from the site - especially with it being Cisco's own site.
TG | |
| Boulware5 2004-02-08, 10:40 pm |
| If it's from CISCO then it is true. Just like if Microsoft says something about Windows you can pretty much bet it's right. | |
| azimuth40 2004-02-08, 11:26 pm |
| Well if you are using a hardware state machine (most likely because they are cheap) then it is probably true. After all you have to listen to the line continuously anyway looking for packets addressed to you so spotting a gap in the traffic would be easy and likely only one branch off the state machine. From a hardware standpoint it is probably the equivalent of an AND gate with packet gap and ready to transmit as inputs. From a logic standpoint that is the same as listening continuously. |
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