I will go further and say I dont even think it has anything to do with jitter or timing. The changes in network equipment and cables, which are audible, are all about the ground noise, and also the ultra high frequency noise from oscillators and fast switching network chips riding down the connection path into the analog part of the audio system. And galvanic isolation does nothing to block this high frequency noise, it only helps on a certain part of the noise spectrum.
None of the above effects the data packet transfer, which works as per spec, regardless if ground noise and high frequency noise is very high or very low.
I will go further and say I dont even think it has anything to do with jitter or timing. The changes in network equipment and cables, which are audible, are all about the ground noise, and also the ultra high frequency noise from oscillators and fast switching network chips riding down the connection path into the analog part of the audio system. And galvanic isolation does nothing to block this high frequency noise, it only helps on a certain part of the noise spectrum.
None of the above effects the data packet transfer, which works as per spec, regardless if ground noise and high frequency noise is very high or very low.
Jitter (deterministic jitter and threshold jitter), as well as timing error play a key role, as does phase noise. Also, ground-plane noise reduction (e.g. low- and high-source impedance leakage current) is key as it affects timing, as well* in the form of threshold jitter). I'll just add that the "signal" is not 0's and 1's, that is only how the source data is...encoded.The actual signal is an analog square wave voltage, typically 0 V and 2V, and as such, is suspectible to all the various classes of noise factors impacting an analog voltage that have been discussed, both in this thread and elsewhere.
I have tried most of the other spf’s listed and the Cisco out performs the finisar that people rave about. It is more open, slightly more detail and removes any sibilance. (I have a draw of spf’s and optical cable all which didn’t make the mark.)
You can get the Cisco on eBay for quite cheap, they are £350 new.
I have tried most of the other spf’s listed and the Cisco out performs the finisar that people rave about. It is more open, slightly more detail and removes any sibilance. (I have a draw of spf’s and optical cable all which didn’t make the mark.)
You can get the Cisco on eBay for quite cheap, they are £350 new.
I have tried most of the other spf’s listed and the Cisco out performs the finisar that people rave about. It is more open, slightly more detail and removes any sibilance. (I have a draw of spf’s and optical cable all which didn’t make the mark.)
You can get the Cisco on eBay for quite cheap, they are £350 new.
SFP are cheap buy a couple Finisar, Cisco and see or hear what works best for your setup. For me it was the Finisars and never looked back. YMMV no one brand or model is the answer for all, though some may think it.
SFP are cheap buy a couple Finisar, Cisco and see or hear what works best for your setup. For me it was the Finisars and never looked back. YMMV no one brand or model is the answer for all, though some may think it.
I agree. SFPs are like any other audio component, they need to complement the tonality of the system and listener preferences. Some prefer the lush sound of the Cisco AOC, and some prefer the more detail-forward Finisars.
SFP are cheap buy a couple Finisar, Cisco and see or hear what works best for your setup. For me it was the Finisars and never looked back. YMMV no one brand or model is the answer for all, though some may think it.
I have a drawer full of modules - three or four different Finisars. The problem is that the old Cisco 2960 (even if mine has been upgraded with LPS and clock) are very picky about which module will work. Most of my Finisars won’t (they do test out fine elsewhere). So until and when I move to either an EtherRegen 2 or an LHY (still hoping the ER2 will be out soon as I’d like to try that one), the Finisars will have to stay sitting on the bench. Believe me I will try them out as soon as I can!
I have a drawer full of modules - three or four different Finisars. The problem is that the old Cisco 2960 (even if mine has been upgraded with LPS and clock) are very picky about which module will work. Most of my Finisars won’t (they do test out fine elsewhere). So until and when I move to either an EtherRegen 2 or an LHY (still hoping the ER2 will be out soon as I’d like to try that one), the Finisars will have to stay sitting on the bench. Believe me I will try them out as soon as I can!
We did find that when we changed out the converters from the generic converters they worked fine. So you may have a suspect converter IDK? We sure are not going to fix it here.
I found the Finisars to be the best-sounding when using multi-mode fiber. When I switched to Corning ClearCurve single-mode fiber, per Lumin's recommendation, I switched to Planet Tech TL-40 single-mode FMCs. For my Lumin setup, the single-mode fiber sounded better than using multi-mode. Single-mode fiber is Lumin's recommendation, also.
...I haven't run with optical for a couple of years now, but IIRC those 2960s (all Cisco?) will reference a Cisco ID (Vendor Code) in the transceiver, so you need a Cisco SFP or a Cisco-compatible version.
