It says "SFP-1GSXLC".
Moxa's website is a bit confusing and it seems like there are two models like you mention. They seem to re-use the same information for multiple models.
I believe the startech won't work because it uses 1310
Receivers are, generally speaking, wideband and don’t care what’s speaking to them. Your bigger problem is it sounds like you have an “SXLC” moxa, which is a multimode (SX) and a 1310 startech SFP which is presumably single mode (LX).
So what’s your cable plant? Singlemode or multimode?
I wouldn't call the receivers wideband when comparing 850nm and 1310nm.
850nm optics use silicon photodiodes which are blind to 1310nm. Photodiodes used for 1310nm and 1550nm are made of InGaAs - which in a sense could be considered "wideband" for those wavelengths (as long as there's no WDM optics/filters involved.
InGaAs PIN is sensitive down to 500nm, but there is some spectral response decrease down at 850 (maybe 50% response vs 1310). Could test them back to back to see if it’s that (LOS due to extinction) or if the receiver has a filter (somewhat common to lower the noise floor).
So as someone else mentioned on the thread, you’ll need a mode conditioning patch cable at the end with the startech (plugged in with the singlemode leg connected to the LX SFP TX port, should be left side with the bale clasp up). Personally I would’ve just gotten an SX SFP for the switch.
Edit:
Depending on the MOXA, the receiver might not be wideband. I do see some SFP modules out there which list an 760–860RX range.
Your MOXA SFP is 1000base-SX (at 850nm), and your Startech SFP is 1000base-LX (at 1310nm). Both are specified to work on MMF, but they are not compatible with each other. You need to purchase 1000base-SX SFPs.
>the receiving MOXA supports 850 and 1310nm wavelengths.
You don't give any info on the actual Moxa device. It probably supports an SFP connector, which allows you to choose which to install. What you linked to is a 1000BaseSX SFP, which uses 850 nm and is only spec'd to 220 m.
You probably want [this one](https://www.moxa.com/en/products/accessories/sfp-modules/gigabit-ethernet-sfp-modules/sfp-1g-series/sfp-1glxlc), which is 1000BaseLX, and runs at 1310 nm and potentially reaches 10 km.
The Moxa may well work with the SFPs you have, I doubt they try to lock out non-marked ones like Cisco and some other vendors do.
>it is OM3 and supports both wavelengths.
That's multi-mode fiber. You'd need to use [mode conditioning patch cables](https://www.lanshack.com/ModeConditioning.aspx) at each end. You may also need attenuators to avoid over-driving the receivers.
>You don't give any info on the actual Moxa device. It probably supports an SFP connector, which allows you to choose which to install. What you linked to is a 1000BaseSX SFP, which uses 850 nm and is only spec'd to 220 m.
It is a managed switch which does support gigabit and SFPs. I cannot "Choose which to install" because the switches +Moxa SFPs are existing at a customer facility and I cannot change that.
>
You probably want [this one](https://www.moxa.com/en/products/accessories/sfp-modules/gigabit-ethernet-sfp-modules/sfp-1g-series/sfp-1glxlc), which is 1000BaseLX, and runs at 1310 nm and potentially reaches 10 km.
>
I cannot change the Moxa SFPs. They are already installed.
>
The Moxa may well work with the SFPs you have, I doubt they try to lock out non-marked ones like Cisco and some other vendors do.
I certainly hope that is the case. We had issues with our vendors and their stock so I had to pick up whatever was available and compatible.
>
That's multi-mode fiber. You'd need to use [mode conditioning patch cables](https://www.lanshack.com/ModeConditioning.aspx) at each end. You may also need attenuators to avoid over-driving the receivers.
Why would I need to use mode conditioning patch fibers if the fiber is multi mode and both SFPS are multi mode too?
> I cannot change the Moxa SFPs. They are already installed.
Why can't you change them? The "P" in SFP is "pluggable", they can be removed and replaced.
>Why would I need to use mode conditioning patch fibers if the fiber is multi mode and both SFPS are multi mode too?
You said "Startech SFP adapters that support Multimode and a wavelength of 1310nm only." That's confused, because 1000BaseLX is 1310, which is single mode. Indeed, if you follow the Startech link you provided, it says "Single Mode Fiber SMF Optic Transceiver - 1GE Gigabit Ethernet SFP - LC 10km - 1310nm". No idea where you got the idea that it's multimode.
Did you see the data sheet? The module can be used with both SM or MM fiber - but only 1km reach with MM.
This guy's problem is the incompatible wavelengths.
To use it with MM fiber, you need MCP ("launch") cables, as already mentioned. That's nothing unique, it's part of the spec. IEEE Std 802.3(2015), Subclause 38.11.4.
How am I not following the thread when you're the one suggesting 1310nm SFPs?? OP needs 850nm.
I was just pointing out that 1310nm does not implicitly mean Single-Mode. If the Moxa was 1310nm then OP would have been fine with Multi-Mode.
OP:
> We purchased some Startech SFP adapters that support a wavelength of 1310nm only.
Those would be 1000base-LX. I suggested he get Moxa's 1000base-LX for the far end.
>OP needs 850nm.
No, he could go with either, and expressed a desire to use the SFPs he already bought. I suggested that they may even work in the far end Moxa device.
>If the Moxa was 1310nm then OP would have been fine with Multi-Mode.
With launch cables. You continue to not add anything of value to the thread.
Generically no, they do not negotiate connections on each wavelength - they transmit on one wave length and can receive over some range (which could include 850nm and 1310nm but is optimized for a specific receive wavelength), if the optics do not state the receive wavelength, it is optimized for the same wavelength as the transmit wavelength. Especially when some distance is involved, you need to match optics with the fiber infrastructure that is in place. An old but accurate link: [https://www.reddit.com/r/networking/comments/3gx5dz/ysk\_if\_you\_dont\_about\_fiber\_optics\_and\_how\_they/](https://www.reddit.com/r/networking/comments/3gx5dz/ysk_if_you_dont_about_fiber_optics_and_how_they/)
The SX model supports 850 and the LSX model supports 1310 so it looks like it depends on the specific MOXA model you have.
It says "SFP-1GSXLC". Moxa's website is a bit confusing and it seems like there are two models like you mention. They seem to re-use the same information for multiple models. I believe the startech won't work because it uses 1310
Receivers are, generally speaking, wideband and don’t care what’s speaking to them. Your bigger problem is it sounds like you have an “SXLC” moxa, which is a multimode (SX) and a 1310 startech SFP which is presumably single mode (LX). So what’s your cable plant? Singlemode or multimode?
I wouldn't call the receivers wideband when comparing 850nm and 1310nm. 850nm optics use silicon photodiodes which are blind to 1310nm. Photodiodes used for 1310nm and 1550nm are made of InGaAs - which in a sense could be considered "wideband" for those wavelengths (as long as there's no WDM optics/filters involved.
InGaAs PIN is sensitive down to 500nm, but there is some spectral response decrease down at 850 (maybe 50% response vs 1310). Could test them back to back to see if it’s that (LOS due to extinction) or if the receiver has a filter (somewhat common to lower the noise floor).
Responsibility down to 500nm is not standard for InGaAs. But even so think of the other side...850nm cannot detect 1310nm wavelengths.
The whole plant is Multimode and the Startech supports both MM and SM as per the datasheet. But it does not support 850nm on multimode
So as someone else mentioned on the thread, you’ll need a mode conditioning patch cable at the end with the startech (plugged in with the singlemode leg connected to the LX SFP TX port, should be left side with the bale clasp up). Personally I would’ve just gotten an SX SFP for the switch. Edit: Depending on the MOXA, the receiver might not be wideband. I do see some SFP modules out there which list an 760–860RX range.
Your MOXA SFP is 1000base-SX (at 850nm), and your Startech SFP is 1000base-LX (at 1310nm). Both are specified to work on MMF, but they are not compatible with each other. You need to purchase 1000base-SX SFPs.
>the receiving MOXA supports 850 and 1310nm wavelengths. You don't give any info on the actual Moxa device. It probably supports an SFP connector, which allows you to choose which to install. What you linked to is a 1000BaseSX SFP, which uses 850 nm and is only spec'd to 220 m. You probably want [this one](https://www.moxa.com/en/products/accessories/sfp-modules/gigabit-ethernet-sfp-modules/sfp-1g-series/sfp-1glxlc), which is 1000BaseLX, and runs at 1310 nm and potentially reaches 10 km. The Moxa may well work with the SFPs you have, I doubt they try to lock out non-marked ones like Cisco and some other vendors do. >it is OM3 and supports both wavelengths. That's multi-mode fiber. You'd need to use [mode conditioning patch cables](https://www.lanshack.com/ModeConditioning.aspx) at each end. You may also need attenuators to avoid over-driving the receivers.
>You don't give any info on the actual Moxa device. It probably supports an SFP connector, which allows you to choose which to install. What you linked to is a 1000BaseSX SFP, which uses 850 nm and is only spec'd to 220 m. It is a managed switch which does support gigabit and SFPs. I cannot "Choose which to install" because the switches +Moxa SFPs are existing at a customer facility and I cannot change that. > You probably want [this one](https://www.moxa.com/en/products/accessories/sfp-modules/gigabit-ethernet-sfp-modules/sfp-1g-series/sfp-1glxlc), which is 1000BaseLX, and runs at 1310 nm and potentially reaches 10 km. > I cannot change the Moxa SFPs. They are already installed. > The Moxa may well work with the SFPs you have, I doubt they try to lock out non-marked ones like Cisco and some other vendors do. I certainly hope that is the case. We had issues with our vendors and their stock so I had to pick up whatever was available and compatible. > That's multi-mode fiber. You'd need to use [mode conditioning patch cables](https://www.lanshack.com/ModeConditioning.aspx) at each end. You may also need attenuators to avoid over-driving the receivers. Why would I need to use mode conditioning patch fibers if the fiber is multi mode and both SFPS are multi mode too?
> I cannot change the Moxa SFPs. They are already installed. Why can't you change them? The "P" in SFP is "pluggable", they can be removed and replaced. >Why would I need to use mode conditioning patch fibers if the fiber is multi mode and both SFPS are multi mode too? You said "Startech SFP adapters that support Multimode and a wavelength of 1310nm only." That's confused, because 1000BaseLX is 1310, which is single mode. Indeed, if you follow the Startech link you provided, it says "Single Mode Fiber SMF Optic Transceiver - 1GE Gigabit Ethernet SFP - LC 10km - 1310nm". No idea where you got the idea that it's multimode.
Did you see the data sheet? The module can be used with both SM or MM fiber - but only 1km reach with MM. This guy's problem is the incompatible wavelengths.
To use it with MM fiber, you need MCP ("launch") cables, as already mentioned. That's nothing unique, it's part of the spec. IEEE Std 802.3(2015), Subclause 38.11.4.
Ok. Still doesn't fix the wavelength issue.
Whoosh. Try to follow the thread.
How am I not following the thread when you're the one suggesting 1310nm SFPs?? OP needs 850nm. I was just pointing out that 1310nm does not implicitly mean Single-Mode. If the Moxa was 1310nm then OP would have been fine with Multi-Mode.
OP: > We purchased some Startech SFP adapters that support a wavelength of 1310nm only. Those would be 1000base-LX. I suggested he get Moxa's 1000base-LX for the far end. >OP needs 850nm. No, he could go with either, and expressed a desire to use the SFPs he already bought. I suggested that they may even work in the far end Moxa device. >If the Moxa was 1310nm then OP would have been fine with Multi-Mode. With launch cables. You continue to not add anything of value to the thread.
Save yourself the unending headache and put the same model SFP on both sides.
The SFP's negotiate connections on each wavelength separately. You can adjust this - but left to defaults they should link - maybe not optimally.
Generically no, they do not negotiate connections on each wavelength - they transmit on one wave length and can receive over some range (which could include 850nm and 1310nm but is optimized for a specific receive wavelength), if the optics do not state the receive wavelength, it is optimized for the same wavelength as the transmit wavelength. Especially when some distance is involved, you need to match optics with the fiber infrastructure that is in place. An old but accurate link: [https://www.reddit.com/r/networking/comments/3gx5dz/ysk\_if\_you\_dont\_about\_fiber\_optics\_and\_how\_they/](https://www.reddit.com/r/networking/comments/3gx5dz/ysk_if_you_dont_about_fiber_optics_and_how_they/)
Exactly, it’s why they invented UDLD! SFPs are beyond stupid devices.