How do I resolve connection issues between two 10/100Base-Tx to 100Base-Fx fast Ethernet converters

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My network at two points, A and B, have the same connection devices that have been working well until recently. A (A is the internet entry point) transmits internet to B (B is the data centre) and B distributes to other locations, ie. C, D, F,G. A and B are connected by fiber using an OLT.



I never noticed before, but since it stopped working, I only see three lights under TX blinking at both point A and B.



Obviously the two devices are not communicating, but does it mean one of them is broken?






networking







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  • 1




    Hi Masssly and welcome. How long are the fibres between A and B? My first guess would be damage to those, before suspecting the devices. What is the manufacturer and model?
    – jonathanjo
    3 hours ago






  • 1




    Having dealt with more than 3000 fiber converters, i can surely write, that it is common for converters to stop working suddenly.
    – Cown
    3 hours ago






  • 1




    I suspect your environment is better regulated than most of mine, which are usually temporary sites, where things tend to break because of feet, tools, and similar -- which means it's basically always a cable of one kind or another. 3000 is a lot of experience, do you know what part of them tends to fail?
    – jonathanjo
    3 hours ago






  • 1




    @jonathanjo 100BASE-FX only uses LEDs which can last for ever - but they can break, too. Burned-out receivers should be very rare due to the low power involved.
    – Zac67
    3 hours ago






  • 1




    Well, the most errors i've seen was after thunder storms. But i have tried to turn off and turn on a converter at least 20 times, where it did not work afterwards. 3000 is also over a span of around 12 years.
    – Cown
    2 hours ago














up vote
1
down vote

favorite
1












enter image description here
My network at two points, A and B, have the same connection devices that have been working well until recently. A (A is the internet entry point) transmits internet to B (B is the data centre) and B distributes to other locations, ie. C, D, F,G. A and B are connected by fiber using an OLT.



I never noticed before, but since it stopped working, I only see three lights under TX blinking at both point A and B.



Obviously the two devices are not communicating, but does it mean one of them is broken?






networking







share|improve this question

















  • 1




    Hi Masssly and welcome. How long are the fibres between A and B? My first guess would be damage to those, before suspecting the devices. What is the manufacturer and model?
    – jonathanjo
    3 hours ago






  • 1




    Having dealt with more than 3000 fiber converters, i can surely write, that it is common for converters to stop working suddenly.
    – Cown
    3 hours ago






  • 1




    I suspect your environment is better regulated than most of mine, which are usually temporary sites, where things tend to break because of feet, tools, and similar -- which means it's basically always a cable of one kind or another. 3000 is a lot of experience, do you know what part of them tends to fail?
    – jonathanjo
    3 hours ago






  • 1




    @jonathanjo 100BASE-FX only uses LEDs which can last for ever - but they can break, too. Burned-out receivers should be very rare due to the low power involved.
    – Zac67
    3 hours ago






  • 1




    Well, the most errors i've seen was after thunder storms. But i have tried to turn off and turn on a converter at least 20 times, where it did not work afterwards. 3000 is also over a span of around 12 years.
    – Cown
    2 hours ago












up vote
1
down vote

favorite
1









up vote
1
down vote

favorite
1






1





enter image description here
My network at two points, A and B, have the same connection devices that have been working well until recently. A (A is the internet entry point) transmits internet to B (B is the data centre) and B distributes to other locations, ie. C, D, F,G. A and B are connected by fiber using an OLT.



I never noticed before, but since it stopped working, I only see three lights under TX blinking at both point A and B.



Obviously the two devices are not communicating, but does it mean one of them is broken?






networking







share|improve this question













enter image description here
My network at two points, A and B, have the same connection devices that have been working well until recently. A (A is the internet entry point) transmits internet to B (B is the data centre) and B distributes to other locations, ie. C, D, F,G. A and B are connected by fiber using an OLT.



I never noticed before, but since it stopped working, I only see three lights under TX blinking at both point A and B.



Obviously the two devices are not communicating, but does it mean one of them is broken?






networking




networking






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 3 hours ago









Masssly

163




163







  • 1




    Hi Masssly and welcome. How long are the fibres between A and B? My first guess would be damage to those, before suspecting the devices. What is the manufacturer and model?
    – jonathanjo
    3 hours ago






  • 1




    Having dealt with more than 3000 fiber converters, i can surely write, that it is common for converters to stop working suddenly.
    – Cown
    3 hours ago






  • 1




    I suspect your environment is better regulated than most of mine, which are usually temporary sites, where things tend to break because of feet, tools, and similar -- which means it's basically always a cable of one kind or another. 3000 is a lot of experience, do you know what part of them tends to fail?
    – jonathanjo
    3 hours ago






  • 1




    @jonathanjo 100BASE-FX only uses LEDs which can last for ever - but they can break, too. Burned-out receivers should be very rare due to the low power involved.
    – Zac67
    3 hours ago






  • 1




    Well, the most errors i've seen was after thunder storms. But i have tried to turn off and turn on a converter at least 20 times, where it did not work afterwards. 3000 is also over a span of around 12 years.
    – Cown
    2 hours ago












  • 1




    Hi Masssly and welcome. How long are the fibres between A and B? My first guess would be damage to those, before suspecting the devices. What is the manufacturer and model?
    – jonathanjo
    3 hours ago






  • 1




    Having dealt with more than 3000 fiber converters, i can surely write, that it is common for converters to stop working suddenly.
    – Cown
    3 hours ago






  • 1




    I suspect your environment is better regulated than most of mine, which are usually temporary sites, where things tend to break because of feet, tools, and similar -- which means it's basically always a cable of one kind or another. 3000 is a lot of experience, do you know what part of them tends to fail?
    – jonathanjo
    3 hours ago






  • 1




    @jonathanjo 100BASE-FX only uses LEDs which can last for ever - but they can break, too. Burned-out receivers should be very rare due to the low power involved.
    – Zac67
    3 hours ago






  • 1




    Well, the most errors i've seen was after thunder storms. But i have tried to turn off and turn on a converter at least 20 times, where it did not work afterwards. 3000 is also over a span of around 12 years.
    – Cown
    2 hours ago







1




1




Hi Masssly and welcome. How long are the fibres between A and B? My first guess would be damage to those, before suspecting the devices. What is the manufacturer and model?
– jonathanjo
3 hours ago




Hi Masssly and welcome. How long are the fibres between A and B? My first guess would be damage to those, before suspecting the devices. What is the manufacturer and model?
– jonathanjo
3 hours ago




1




1




Having dealt with more than 3000 fiber converters, i can surely write, that it is common for converters to stop working suddenly.
– Cown
3 hours ago




Having dealt with more than 3000 fiber converters, i can surely write, that it is common for converters to stop working suddenly.
– Cown
3 hours ago




1




1




I suspect your environment is better regulated than most of mine, which are usually temporary sites, where things tend to break because of feet, tools, and similar -- which means it's basically always a cable of one kind or another. 3000 is a lot of experience, do you know what part of them tends to fail?
– jonathanjo
3 hours ago




I suspect your environment is better regulated than most of mine, which are usually temporary sites, where things tend to break because of feet, tools, and similar -- which means it's basically always a cable of one kind or another. 3000 is a lot of experience, do you know what part of them tends to fail?
– jonathanjo
3 hours ago




1




1




@jonathanjo 100BASE-FX only uses LEDs which can last for ever - but they can break, too. Burned-out receivers should be very rare due to the low power involved.
– Zac67
3 hours ago




@jonathanjo 100BASE-FX only uses LEDs which can last for ever - but they can break, too. Burned-out receivers should be very rare due to the low power involved.
– Zac67
3 hours ago




1




1




Well, the most errors i've seen was after thunder storms. But i have tried to turn off and turn on a converter at least 20 times, where it did not work afterwards. 3000 is also over a span of around 12 years.
– Cown
2 hours ago




Well, the most errors i've seen was after thunder storms. But i have tried to turn off and turn on a converter at least 20 times, where it did not work afterwards. 3000 is also over a span of around 12 years.
– Cown
2 hours ago










1 Answer
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As it seems, the fiber link is down. There is no link light for 100BASE-FX on either side as you wrote. Note that usually, both sides' link lights go dark when one of the converters dies or one of the fibers fail.



Possible causes:



1) One of the converters died.



Check out with a spare converter or any other device speaking 100BASE-FX. For a quick test, disconnect the 100BASE-TX side from the network (unless you've got STP active) and use an SC-SC patch cable to connect a converter to itself, it should link with itself. (Some converters require that the 100BASE-TX is linked though.) Looking at the transmitter side even through a digicam is useless due to -FX's long 1300 nm wavelength.



2) The fiber is broken



If a spare/test device links on both converters but not across the fiber, the latter is disrupted. Check the patch cables for damage or tight bends - single-mode is especially sensitive to an undercut bend radius.



Generally, it's a good idea to use pluggable transceivers in managed switches. If you use SFP transceivers with DOM (digital optical monitoring) in a managed switch you can monitor the transmitted and received power on the link.



While you're at it you might want to go for 1000BASE-LX (it looks like you've got single-mode fiber). You might also want to go for 1000BASE-BX and run two links aggregated with failover capability - there are many very affordable 3rd-party transceivers around. -BX is also a solution when one fiber has failed but can't be replaced and the other still works.






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    up vote
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    As it seems, the fiber link is down. There is no link light for 100BASE-FX on either side as you wrote. Note that usually, both sides' link lights go dark when one of the converters dies or one of the fibers fail.



    Possible causes:



    1) One of the converters died.



    Check out with a spare converter or any other device speaking 100BASE-FX. For a quick test, disconnect the 100BASE-TX side from the network (unless you've got STP active) and use an SC-SC patch cable to connect a converter to itself, it should link with itself. (Some converters require that the 100BASE-TX is linked though.) Looking at the transmitter side even through a digicam is useless due to -FX's long 1300 nm wavelength.



    2) The fiber is broken



    If a spare/test device links on both converters but not across the fiber, the latter is disrupted. Check the patch cables for damage or tight bends - single-mode is especially sensitive to an undercut bend radius.



    Generally, it's a good idea to use pluggable transceivers in managed switches. If you use SFP transceivers with DOM (digital optical monitoring) in a managed switch you can monitor the transmitted and received power on the link.



    While you're at it you might want to go for 1000BASE-LX (it looks like you've got single-mode fiber). You might also want to go for 1000BASE-BX and run two links aggregated with failover capability - there are many very affordable 3rd-party transceivers around. -BX is also a solution when one fiber has failed but can't be replaced and the other still works.






    share|improve this answer


























      up vote
      4
      down vote













      As it seems, the fiber link is down. There is no link light for 100BASE-FX on either side as you wrote. Note that usually, both sides' link lights go dark when one of the converters dies or one of the fibers fail.



      Possible causes:



      1) One of the converters died.



      Check out with a spare converter or any other device speaking 100BASE-FX. For a quick test, disconnect the 100BASE-TX side from the network (unless you've got STP active) and use an SC-SC patch cable to connect a converter to itself, it should link with itself. (Some converters require that the 100BASE-TX is linked though.) Looking at the transmitter side even through a digicam is useless due to -FX's long 1300 nm wavelength.



      2) The fiber is broken



      If a spare/test device links on both converters but not across the fiber, the latter is disrupted. Check the patch cables for damage or tight bends - single-mode is especially sensitive to an undercut bend radius.



      Generally, it's a good idea to use pluggable transceivers in managed switches. If you use SFP transceivers with DOM (digital optical monitoring) in a managed switch you can monitor the transmitted and received power on the link.



      While you're at it you might want to go for 1000BASE-LX (it looks like you've got single-mode fiber). You might also want to go for 1000BASE-BX and run two links aggregated with failover capability - there are many very affordable 3rd-party transceivers around. -BX is also a solution when one fiber has failed but can't be replaced and the other still works.






      share|improve this answer
























        up vote
        4
        down vote










        up vote
        4
        down vote









        As it seems, the fiber link is down. There is no link light for 100BASE-FX on either side as you wrote. Note that usually, both sides' link lights go dark when one of the converters dies or one of the fibers fail.



        Possible causes:



        1) One of the converters died.



        Check out with a spare converter or any other device speaking 100BASE-FX. For a quick test, disconnect the 100BASE-TX side from the network (unless you've got STP active) and use an SC-SC patch cable to connect a converter to itself, it should link with itself. (Some converters require that the 100BASE-TX is linked though.) Looking at the transmitter side even through a digicam is useless due to -FX's long 1300 nm wavelength.



        2) The fiber is broken



        If a spare/test device links on both converters but not across the fiber, the latter is disrupted. Check the patch cables for damage or tight bends - single-mode is especially sensitive to an undercut bend radius.



        Generally, it's a good idea to use pluggable transceivers in managed switches. If you use SFP transceivers with DOM (digital optical monitoring) in a managed switch you can monitor the transmitted and received power on the link.



        While you're at it you might want to go for 1000BASE-LX (it looks like you've got single-mode fiber). You might also want to go for 1000BASE-BX and run two links aggregated with failover capability - there are many very affordable 3rd-party transceivers around. -BX is also a solution when one fiber has failed but can't be replaced and the other still works.






        share|improve this answer














        As it seems, the fiber link is down. There is no link light for 100BASE-FX on either side as you wrote. Note that usually, both sides' link lights go dark when one of the converters dies or one of the fibers fail.



        Possible causes:



        1) One of the converters died.



        Check out with a spare converter or any other device speaking 100BASE-FX. For a quick test, disconnect the 100BASE-TX side from the network (unless you've got STP active) and use an SC-SC patch cable to connect a converter to itself, it should link with itself. (Some converters require that the 100BASE-TX is linked though.) Looking at the transmitter side even through a digicam is useless due to -FX's long 1300 nm wavelength.



        2) The fiber is broken



        If a spare/test device links on both converters but not across the fiber, the latter is disrupted. Check the patch cables for damage or tight bends - single-mode is especially sensitive to an undercut bend radius.



        Generally, it's a good idea to use pluggable transceivers in managed switches. If you use SFP transceivers with DOM (digital optical monitoring) in a managed switch you can monitor the transmitted and received power on the link.



        While you're at it you might want to go for 1000BASE-LX (it looks like you've got single-mode fiber). You might also want to go for 1000BASE-BX and run two links aggregated with failover capability - there are many very affordable 3rd-party transceivers around. -BX is also a solution when one fiber has failed but can't be replaced and the other still works.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited 13 mins ago

























        answered 3 hours ago









        Zac67

        21.8k21250




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