Sfp+ module/transceiver for optic fiber - which one?

Hardware Questions and Recommendations
1

Guys,

sorry for the very off-topic question but i am struggling to get info from my ISP and i am not 100% sure after my internet searches, your help is highly appreciated...

I want to replace ISP modem/router and I want to build my home-made router with sfp+ WAN (i know it is probably an overkill but I am moving to a new house and this seems like a nice little project)

From a software perspective this seems easy, my ISP will be ok as long as i give them the mac address of my router.

From the hardware side, i asked them to help me and point me in the right direction to understand what sfp+ module i need to buy and they basically told me that they are not going to give me any specs/info.

I see different standards LR/SR, different manufacturers with different price tags and I am not clear on what i need (it has to be compatible with openwrt....). Could someone take a look at the fiber connector that i currently plug into my ISP router and point me in the right direction?

thanks a lot
M

link to fiber connector

2

So are you running 10G???

3

not yet.. but the idea would be to kind of future proof it

M

4

So SFP+ is not the same as SFP, if you want to replace the ONT with your own device it really depends on what they are using.

It's not an easy task, suggest you to keep their ONT and just use your device as router by connecting to it, this would be a lot easier.

5

i see, so i guess this will not be much different from what i am doing now (disabled wifi/firewall/dhcp etc. and DMZ on a port to which i connect my existing router with openwrt)

i was a bit naive, i thought they were basically the same but newer/faster :wink:
i also thought that since i get already the fiber directly to my home (i don't have any external device apart from the ISP router) it would have been as simple as plugging the fiber connector into a SFP+ module --> plugging the SFP+ module into the NIC on my new router and ready to go...

M

6

Your ISP device cannot be set as bridge mode? If it's purely modem or ONT then it doesn't have router function, so what IP you get when you plug computer to ISP device?

First, 2.5G based or slower service would be using SFP, not SFP+ (note the difference), and if you want to have GPON directly on router, it's doable however you get no support from ISP.

7

It is a router/wireless AP, it has an integrated optic fiber inlet where i plug the connector in the picture i posted.
italian forum with disassembled router
I spent some time going through forums and i think i understand a tiny bit better.
it should have an internal ONT
i checked all the options on its webpage but i cannot find a way to set it into bridge mode...
DMZ works, it just seems silly to me to have a device that basically just connects the fiber line to my tplink with openwrt
so when i started thinking about upgrading my setup i wanted to try to get it of it and i thought that plugging the fiber connector into an sfp+ (or sfp) module and then plugging the sfp module into an sfp+ port on my home-made router would have worked...

hope this clarifies a bit

thanks

M

8

Any chance to get just ONT only without a combo?

9

@fakemanhk , you are a star... i didn't know.. but apparently the ISP's (in Italy, not sure if it is the same in other countries) are obliged to provide ONT if asked...

i just did that, next Wednesday they will come and install the separate ONT :+1:

they asked for my router manufacturer and model, I am not sure why they need this info... i told them that I will be using my archer and they were fine with it... i mentioned that i will build my own device but i think this went over the head of the lady from customer service... she basically asked to put that aside for the moment.. she could not cope with it...

do you have any recommendation?

thanks a lot
M

10

You don't need to tell them this, first they might not understand, second they probably just want to make sure that you have some proper way to connect to internet, if you are talking about something they don't know you might make it more complicated.

11

sorry, i have some more doubts...

i see that the ISP says on its website says that depending whether i have a GPON or a BS-GPON or a VULA FTTH i have to use:

  • network cable in untagged mode
  • tagged mode (VLAN ID 835; CoS 0 for data traffic and CoS 1 for voice traffic)
  • tagged mode (VLAN ID 835; CoS 0 for data traffic and CoS 2 for voice traffic)

i found vlan's always a bit tricky, i guess I will have to study them better...

if i look at what i think is my wan port in the current network config i see:

config switch_vlan
        option device 'switch0'
        option vlan '2'
        option ports '1 6t'

so I am thinking that I need to replace vlan '2' with vlan '835'
is this what i need?

I used to have the wan IP address set statically and have its dns/gateway pointing to the ip address of the ISP router. If there is no more ISP router, I am guessing here... should i point to the ip address of the ONT?

If there is any guide or tutorial that you believe it could help me in getting some direction, please let me know.. i don't mind studying but I seem to be struggling to find info (or maybe it has been only a very long week and the weekend will bring more light...)

one more thing, i tried to find some info on CoS, i undestand that this is the class of service, but i could not find a way to set it in openwrt. Am i missing something?

thanks a lot

M

12

These fiber service service providers use PON Networks and there are serval different types of PON Networks. You need to look up the modem that have already and see if you can find the specifications online about it and that's how you can figure out what exactly they are using and what you might need to get.

Also if they offer speeds of 1GB or less mostly likely they are using a GPON network and would need an SFP GPON module flashed with WRT in a media converter box that supports SFP modules.

In my area, both providers are using an XGS-PON network and can offer symmetric speeds up to 10 GB if they want to. In that case, I would need a sfp+ module or modem that conforms ITU.T G.9807.1 (XGS-PON) and G.988 compliant on the physical layer. Also, it might need to be BBF.247compliant with the management level from the ISP but most likely you will have to manually clone information from your ISP modem for it to work such as Mac address and serial number, PLOAM password usually the account# from what i hear, and maybe software version of your isp modem because the OLT checks for certain things that the ISP are arranged before giving you internet access.

Here is a guy in Vietnam :vietnam: who did what were you trying to do. His provider is using a GPON network. You might have a different type of PON network but the concept should be the same as what you would have to do.

13

thanks @fakemanhk @Cool2180 yesterday my ISP came to install their ONT

it is a huawei echolife hg8010h, even if the ISP's website said that i had to use tagged vlan, it worked with a fresh openwrt install and no changes to network file.
I tried 2 different routers and all worked fine, it seems to me that the ONT is router agnostic, which i guess it means I will have no issue in connecting it to my "home made" router when i get to it.

i will mark this as solved, but wanted to thank you all for the precious support

thanks

M

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