Problems with ER7412-M2 and SFP WAN Link
Dear all,
i have the new ER7412-M2 installed and try to get a fiber WAN running.
The local telco has installed a Fritzbox 5530 Fiber as the NT with an FRITZ!SFP AON (IEEE 802.3 1000Base-BX10) (Rx 1490 nm / 1550 nm ) and (Tx 1310 nm ).
I have bought a tp-link SFP TL-SM321B and matching fiberpatch with LC/UPC.
My goal is to remove the Fritzbox in total and patch the fiber directly form last telco box (patchbox) towards the ER7412-M2 Port 11 with SFP module.
As soon as i establish the patch to the router SFP there is RX Power (mW) 0,235 in DDM Status visible.
BUT the link remain down. All connects at WAN page are unsuccessful.
I spoke to the telco already and ask about internet access autorisation protocol (for example User/ Pass in PPoE)
Answer: i have to use a vlan tag at WAN port and that's it. Already tried this without success.
Has anyone an idea why the SFP port will not came link up?
best regards....
Hi @NutsB22
Thanks for posting in our business forum.
NutsB22 wrote
another finding on my troubleshooting list....
i just removed the FS Generic SFP from the ER7412-M2 and plug it into the Fritzbox5530 (used my patchcable as well) .
The link came up directly
so the SFP and cable working with provider together!
The router has to convert the fiber media to ethernet standard via the SFP modul, but isn't working in this case....
So i come to the result that ER7412-M2 cannot convert this at the SFP slots
On that point i will need another media converter in front of the router to adapt the passive fiber ONT to RJ45 media.
And now the two buildin SFP slots become useless for me...
Try to fix the SFP port to 1000Mbps, will it link up?
Got a confirmation from the team that the router is capable of connecting a fiber if the module and the mode are correct.
As the router is the recipient, if there is a problem, it mainly lies in the fiber, module and mode. It could also be a problem with the ISP SFP end.
i doublecheck the FAQ and found a unmatch with SFP wavelength, so i order a new one....
=> My provider has an Fiber-NT with SMF ITU-T 657, SC/APC Connector TX 1310 RX 1490
=> Use a simplex OS2, Singlemode 9/125µm ITU T G.657, Patchcable SC-APC(8°)<>LC-UPC
=> install a "FS Generic SFP 1000BASE-BX-U BiDi 1310nm-TX/1490nm-RX 10km with DOM Simplex LC/UPC SMF Module"
into the port 11 of ER7412-M2.This result in this DDS statistics:
I still see a Link down at the router... although RX is visible !?!?
The SPF and cable should be the matching wavelength/specs with the provider.
Any ideas out there ?
another finding on my troubleshooting list....
i just removed the FS Generic SFP from the ER7412-M2 and plug it into the Fritzbox5530 (used my patchcable as well) .
The link came up directly so the SFP and cable working with provider together!
The router has to convert the fiber media to ethernet standard via the SFP modul, but isn't working in this case....
So i come to the result that ER7412-M2 cannot convert this at the SFP slots 
On that point i will need another media converter in front of the router to adapt the passive fiber ONT to RJ45 media.
And now the two buildin SFP slots become useless for me... 
Hi @NutsB22
Thanks for posting in our business forum.
NutsB22 wrote
another finding on my troubleshooting list....
i just removed the FS Generic SFP from the ER7412-M2 and plug it into the Fritzbox5530 (used my patchcable as well) .
The link came up directly
The router has to convert the fiber media to ethernet standard via the SFP modul, but isn't working in this case....
So i come to the result that ER7412-M2 cannot convert this at the SFP slots
On that point i will need another media converter in front of the router to adapt the passive fiber ONT to RJ45 media.
And now the two buildin SFP slots become useless for me...
Try to fix the SFP port to 1000Mbps, will it link up?
Got a confirmation from the team that the router is capable of connecting a fiber if the module and the mode are correct.
As the router is the recipient, if there is a problem, it mainly lies in the fiber, module and mode. It could also be a problem with the ISP SFP end.