I understand your explanation about the impossibility of transmitting noise through the fiber, but nevertheless, make changes, upstream of your fiber device and tell me if they change the sound or not. Why, I have no idea but to my ears it is like that.
Lumin X1 Fiber Optic Network Discussions
- Thread starter wklie
- Start date
fair enough -- to be definitive i will have to do this testing. you and peter make a valid point regarding the possibility of ancillary AC pollution.
in my case i am skeptical of any difference as my fiber device is located in a basement closet 19 meters away from my audio system and is on a different circuit.
however, if that SMPS does affect my audio system then i have a MUCH bigger problem... and would need ~20 LPS to replace the various SMPS located all around my house powering various devices and polluting the AC. i should also probably speak with the neighbors about their SMPS as well.
GSOphile
Active member
From a Taiko Audio thread on another forum regarding this subject, one of the Taiko folks opines:
"optical stops some aspects of the noise BUT every conversion from Optical to Ethernet and other way around brings other noise."
i would agree that electrical noise is created when the light signal is converted back to an electric signal at the destination. question is whether the amount of that noise is greater or less than that generated by other inputs such as copper ethernet or a USB receiver. to the extent that they are roughly equal then fiber would be the optimal choice as it has isolated all the upstream electrical noise.
should the light to electric conversion create more noise, fiber would still be the optimal choice up to the point where its noise exceeds that of other electrical inputs PLUS the upstream noise that they carry.
my thinking is that by using fiber i have done everything i can possibly do to provide a noise free signal to the receiving device (DAC, transport, etc) and at that point i am at the mercy of the designers of those devices in terms of how effectively they are able to deal with electrical noise.
for us, there is only the trying. the rest is not our business ― TS Eliot
I read somewhere that there is "glass" and "PVC" fiber optic. Is this referring to the cable's coating? As I understand it all fiber optic is light passing through a glass tube?
I ask about this, because this audiophile reported significantly better sound quality with the glass fiber optic. Does this even make sense?
I ask about this, because this audiophile reported significantly better sound quality with the glass fiber optic. Does this even make sense?
No. Glass and plastic have different applications. Glass is used for long range telecommunications, plastic is used for short range consumer applications. The coating on the cable (jacket material) is also application specific, PVC or whatever. Whether glass or plastic is used, the fiber tube which carries the laser light is always encased in another tube with a different refractive index causing total internal reflection thus minimizes light leaking out of the internal tube.
- Thread Author
- #248
I am pleased that another major manufacturer has announced a product that also includes optical Ethernet as found from Lumin X1. I think this validates the feature as being valuable and important, and reaffirms Lumin innovation in network audio streaming technology.
RDSChicago
Member
Which manufacturer?
Linn Klimax DSM, $39,000.
kimurastanley
New member
Anyone uses edgerouter SFP with lumin X1? I configure it as switch. Able to connect and but could not get the X1 detected in ipad app
kimurastanley
New member
It is okay. In the end it works
kimurastanley
New member
I configured it as switch. Initially can't get it working. I tried to plug-unplug the SFP both ends and X1 appeared in the app.
kimurastanley
New member
Peter, what is Lumin’s take on connecting Roon core using Ethernet cable from X1 Ethernet port out while using SFP?
- Thread Author
- #256
If you mean Roon Core - (RJ45) X1 (SFP) - SFP Switch, yes that'll work. There is a school of thought that prefers a direct network connection between the source (Roon Core) and the endpoint (Lumin) without going through a network switch.
An alternative way is Roon Core (SFP network card) - (SFP) X1 (RJ45) - Switch.
The key thing is that you should not connect Roon Core (a second Ethernet port, if present) to the switch forming a network loop.
An alternative way is Roon Core (SFP network card) - (SFP) X1 (RJ45) - Switch.
The key thing is that you should not connect Roon Core (a second Ethernet port, if present) to the switch forming a network loop.
- Thread Author
- #258
In the Facebook group there is a discussion about whether short fiber can be safely used.
My answer is that with 10km SFP modules, there is negligible concern of damage, according to P.77 and P.78 "Damage by Overpowered Transmitters?" of
https://archive.nanog.org/meetings/...onday/mon.tutorial.Steenbergen.Optical.39.pdf
All the SFP modules in use by Lumin office have continued to work.
Hypothetically, even if it dies after being used for several years in a consumer audio setup, we are talking SFP modules which cost only $7 - $50.
For more discussions please see networking - Can Fiber optic cables be too short? (dBm too high?) - Server Fault
My answer is that with 10km SFP modules, there is negligible concern of damage, according to P.77 and P.78 "Damage by Overpowered Transmitters?" of
https://archive.nanog.org/meetings/...onday/mon.tutorial.Steenbergen.Optical.39.pdf
All the SFP modules in use by Lumin office have continued to work.
Hypothetically, even if it dies after being used for several years in a consumer audio setup, we are talking SFP modules which cost only $7 - $50.
For more discussions please see networking - Can Fiber optic cables be too short? (dBm too high?) - Server Fault
Hi Peter,
Is it possible to update the product recommendations necessary for Fibre optic shown on the website?
The Cisco switches shown are now unavailable in the UK and I am unsure whether any Cisco switch with SFP ports would be suitable for connection.
Any help you or others can give in this is welcome as it is a totally baffling subject to me and the best I can do is to ensure that I have suitable components for instillation without trying to understand the long streams of word soups of stuff on Amazon.
Is it possible to update the product recommendations necessary for Fibre optic shown on the website?
The Cisco switches shown are now unavailable in the UK and I am unsure whether any Cisco switch with SFP ports would be suitable for connection.
Any help you or others can give in this is welcome as it is a totally baffling subject to me and the best I can do is to ensure that I have suitable components for instillation without trying to understand the long streams of word soups of stuff on Amazon.
- Thread Author
- #260
Most models of unmanaged 1000Mbps SFP (not SFP+) switch should work.
Avoid anything that is managed or labeled as smart. Avoid TP-Link SFP switch as they require a manual configuration. (Inexpensive TP-Link unmanaged non-SFP 1000Mbps switches are fine for Lumin products with conventional RJ45 Ethernet connections.)
I think some users here have used inexpensive Trendnet unmanaged SFP switches with success. At the expensive end, SOtM sNH-10G switch is also known to be work.
Avoid anything that is managed or labeled as smart. Avoid TP-Link SFP switch as they require a manual configuration. (Inexpensive TP-Link unmanaged non-SFP 1000Mbps switches are fine for Lumin products with conventional RJ45 Ethernet connections.)
I think some users here have used inexpensive Trendnet unmanaged SFP switches with success. At the expensive end, SOtM sNH-10G switch is also known to be work.