This sounds like the two basic types of packet switching which are usually called store-and-forward, and cut-through. Store-and-forward buffers the whole packet, and forwards it to the destination MAC if the FCS matches, and drops the packet if an error occurs. Cut-through reduces latency by waiting only until the destination MAC is received and then starting to forward bits as they are received, but the result can be forwarding a corrupted packet. Then there’s a hub which is just a repeater and doesn’t even need to look at the destination MAC to know where to send the data.
From: Faisal Imtiaz Sent: Thursday, April 23, 2015 4:17 PM To: [email protected] Subject: Re: [AFMUG] Media converter - store and forward or pass-through Look closer to the specs:- a.. Store-and-Forward Switching Mechanism and the dip switch is labeled "Transmission mode".. This media converter has a 'switch chip' and as such can do actual store and forward of frames (must have some sort of hardware memory buffer in it). So, Dennis's explanation would be correct on what this feature is.. BTW, FYI, not all media converters are built the same, we have seen some media converters which will struggle in passing over a certain amount of packets.... once you put this one in service, you might want to check that you are able to get full thru-put on it. ---------------- but TDM and DS3 is kinda dead in 2015 isn't it? Do you think that all of the Telcom (Phone Calls processing) Network in the US is converted over to IP ? Yes, these are old standards, but still in heavy use, predominantly by Telephony networks --------------- :) Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: [email protected] -------------------------------------------------------------------------------- From: "Josh Luthman" <[email protected]> To: [email protected] Sent: Thursday, April 23, 2015 5:05:12 PM Subject: Re: [AFMUG] Media converter - store and forward or pass-through I just left the office but I'm 99% sure it's this one: Aaxeon/Antaria http://www.antaira.com/products/media-converters/unmanaged-converters/10-100-1000tx-to-1000fx/fcu-3002a-sc-s1?pid=2211 I guess fiber to fiber might make sense (not sure why unless you're making it like a switch to extend distance) but TDM and DS3 is kinda dead in 2015 isn't it? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Thu, Apr 23, 2015 at 4:55 PM, Faisal Imtiaz <[email protected]> wrote: Josh, the world is bigger than what you can see with your eyes ... (Grasshopper) :) I was asking for make = mfg of the media converter you are working with... and yes, contrary to popular belief you may have Media converters come in many flavors... copper to fiber, fiber to fiber , TDM to fiber (e.g. DS3 to fiber).... etc etc etc.. Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: [email protected] ---------------------------------------------------------------------------- From: "Josh Luthman" <[email protected]> To: [email protected] Sent: Thursday, April 23, 2015 4:31:06 PM Subject: Re: [AFMUG] Media converter - store and forward or pass-through One fiber port and one copper port. Is that not the very definition of media converter? What are the other options? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Thu, Apr 23, 2015 at 4:25 PM, Faisal Imtiaz <[email protected]> wrote: What make is the Media converter ? (don't assume the terminology / label implied meaning to be what one thinks it is ) (e.g. here is explanation of the features from one mfg of media converters about the options on their product https://www.perle.com/supportfiles/link-passthrough.shtml ) Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: [email protected] ------------------------------------------------------------------------ From: "Josh Luthman" <[email protected]> To: [email protected] Sent: Thursday, April 23, 2015 4:21:20 PM Subject: Re: [AFMUG] Media converter - store and forward or pass-through Well the dip switch is for store and forward OR pass through. That being the case, it doesn't sound like pass through would follow the link state of anything. I don't remember seeing an option on the dip switches for following link state. Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Thu, Apr 23, 2015 at 4:17 PM, Faisal Imtiaz <[email protected]> wrote: Dennis, I think you are mistaking the 'pass thru' feature on a 'media converter' with something else .... Josh, it pays to look up the actual vendor documentation for that media converter to determine exactly what is the 'pass-thru' feature.... Most of the media converters I have seen, the pass-thru feature is a feature that passes thru link down condition to the other side... (i.e. if the physical link is down on one side, it will bring the link down on the other side too ). Regards Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: [email protected] -------------------------------------------------------------------- From: "Dennis Burgess" <[email protected]> To: [email protected] Sent: Thursday, April 23, 2015 2:25:24 PM Subject: Re: [AFMUG] Media converter - store and forward or pass-through That would be media status. Store and forward vs pass thought allows it to change data speeds. i..e a gige fiber and a 100 meg Ethernet or vice versa by storing packets and then forwarding as needed. If you have gigE fiber and gig Ethernet, pass though should be preferred. From: Af [mailto:[email protected]] On Behalf Of Paul Stewart Sent: Tuesday, April 21, 2015 7:15 PM To: [email protected] Subject: Re: [AFMUG] Media converter - store and forward or pass-through Usually on media converters, it has to do with whether or not to pass the Ethernet status through the fiber. In other words, if the DIP switch is in one setting and there is a loss of connection on the Ethernet then the fiber stays up. In other DIP setting, an Ethernet status of down will also result in the fiber link itself going down. Sometimes it’s the other way around where when there is a fiber outage, it determines whether or not to drop the Ethernet port (this way is more common come to think of it). From: Af [mailto:[email protected]] On Behalf Of Josh Luthman Sent: Tuesday, April 21, 2015 4:44 PM To: [email protected] Subject: [AFMUG] Media converter - store and forward or pass-through I've got a dip switch that's defaulted to pass-through. I know most switches are store and forward and that's about the extent of my knowledge on this. What are the differences between them? Googling pass through transmission mode is all about HIV and Ebola? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373
