Nokia G-040G-B GPON ONT Modem FTTP 4-Port

I have two BB Providers: BT Business & Plusnet for private work. What are the likely issues in configuring this modem for both Providers. eg they are on separate FTTP contracts so I will get the indented speeds on the relevant Ports?

In reply to a post by TonyTek:

I have two BB Providers: BT Business & Plusnet for private work. What are the likely issues in configuring this modem for both Providers. eg they are on separate FTTP contracts so I will get the indented speeds on the relevant Ports?

Remember that the Nokia G040g-b unit has a 1 gigbabit presentation on the ethernet ports.

Also that gpon is 2.5gbit/1.25gbit shared service so just you now have, will continue to be managed.

The problem you will have is difficulty changing service providers as many are not setup for multiple fttp ports going to one property.

In reply to a post by Taras:

the Nokia G040g-b unit has a 1 gigbabit presentation on the ethernet ports.

I always think that having two separate ONT's is the safer option as there is then no restriction via the backplane of the ONT

In reply to a post by Taras:

The problem you will have is difficulty changing service providers as many are not setup for multiple fttp ports going to one property.

Totally agree especially the mass ISP providers

In reply to a post by PCJM40:

In reply to a post by Taras:

the Nokia G040g-b unit has a 1 gigbabit presentation on the ethernet ports.

I always think that having two separate ONT's is the safer option as there is then no restriction via the backplane of the ONT

Not sure if the G040g-b can do 1gb simutaniously on two ports. In theory they should as they are virtual paths.

In reply to a post by TonyTek:

I have two BB Providers: BT Business & Plusnet for private work. What are the likely issues in configuring this modem for both Providers. eg they are on separate FTTP contracts so I will get the indented speeds on the relevant Ports?

Two separately ONT's with two different ISPs are the best way if one of it failover.

Edited by adslmax (Thu 29-Jan-26 11:00:08)

In reply to a post by Taras:

Not sure if the G040g-b can do 1gb simultaneously on two ports. In theory they should as they are virtual paths.

There was a backplane limit of 1Gb on some of the earlier 4 port ONT's which created an overall throughput limit across all 4 ports, hopefully this version doesn't have that issue.

In reply to a post by PCJM40:

In reply to a post by Taras:

Not sure if the G040g-b can do 1gb simultaneously on two ports. In theory they should as they are virtual paths.

There was a backplane limit of 1Gb on some of the earlier 4 port ONT's which created an overall throughput limit across all 4 ports, hopefully this version doesn't have that issue.

hopefully it doesn't .. if it does then the 4port x10gbit one when they do release one (besides being very expensive) would be a worry.

anyways i don't think we have seen any TBBers or Ispreview having an unit

Don't think OR have Multi ONT 2.5Gbps Lan yet?

Exactly, nor does nokia i think

In reply to a post by TonyTek:

I have two BB Providers: BT Business & Plusnet for private work. What are the likely issues in configuring this modem for both Providers. eg they are on separate FTTP contracts so I will get the indented speeds on the relevant Ports?

Thanks for the comments - is any one using this modem? One or more versions are suggested. What is the Serial No, Rev no and/or Manufacture date that works? Thanks

Hello Tony,

With all due respect, I don't think that anyone should be sharing the serial number, of their ONT, with anyone else, excepting their ISP and/or fibre network provider of course.

Make/model/hardware-version/firmware-version not an issue.

Sure, the probability of two random users sharing the same PON or OLT is vanishingly small, but still not good security practice.

Please don't take any offence, whilst I'm am sure that you're not of any nefarious intent, when it comes to security, Zero Trust is the only path to follow.

All the best,

What can the serial number be used for? How is it a vulnerability if it is shared?

In reply to a post by ian72:

What can the serial number be used for? How is it a vulnerability if it is shared?

I agree people are ill advised to share their ONT serial numbers especially with others on the same PON, no one wants their ONT cloned.

The ONT serial number is used to identify and register your ONT on the fibre PON which ensures that only your own data is extracted and de-encrypted to be passed to your home network (and vice versa for upload) The PON is shared by up to 32 users, usually limited to 30 on Openreach FTTP.

Edited by Realalemadrid (Wed 04-Feb-26 09:23:25)

In reply to a post by Realalemadrid:

The ONT serial number is used to identify and register your ONT on the fibre PON which ensures that only your own data is extracted and de-encrypted to be passed to your home network (and vice versa for upload) The PON is shared by up to 32 users, usually limited to 30 on Openreach FTTP.

I susspect that if the olt sees two indentical serials on the pon it may (or it should) disable both.

If you really wanted to snoop you'd capture all of the pon data, and de-encrypt away from the pon.

Tbh it would be easier to compromise the user's lan and devices. Plus using stinger type machines to intercept mobile data is easier, just ask washington DC.

Thankyou both for the explanation. I was interested as to what the risk was.

In reply to a post by TonyTek:

I have two BB Providers: BT Business & Plusnet for private work. What are the likely issues in configuring this modem for both Providers. eg they are on separate FTTP contracts so I will get the indented speeds on the relevant Ports?

Ref original question and possible security - I needed sufficient to identify the Nokia multiport I have was of a build likely to work – I currently get 8-20down whereas single port ONT here records circa 525 down!!
Security issues need not be compromised.

Problem: despite detailed discussion with BTB at the time of ordering, they still failed to specify the two BB providers needed a second connection multiport to work. Resulting install left just a single FTTP by BTB taking over Plusnet’s then partially installed ONT.

A complaint has been raised but BTB has failed to get the set up revised (why?). They even suggested I should buy my own multiport (eBay) for which they would reimburse. Fine -but this multiport drastically restricts available speeds before even Plusnet try to connect (can they in this form.
Meanwhile is there anything else can do? Somehow the BTB -PLUSNET = Openreach Gordian knot has to be broken

Hi,

I think what you're saying is that you need two FTTP services at one property which only has a single fibre to it?

A multiport ONT will not limit speeds to anything less than around 1Gbits/sec in aggregate across all its ports, with some only being limited by the underlying PON. The speeds you quote appear very low for a FTTP connection and there is definitely something wrong.

The solution to this is not in your hands. It is Openreach's decision whether to:
a) Provide a second fibre with its own ONT.
b) Provide a multi-port ONT - they are unlikely to permit the installation of something you have purchased yourself.
c) Decline to provide a second FTTP service at your address.

The only thing you can do is make it clear to whoever you are ordering from what you are trying to do. In your case, you should have ordered a service from one ISP and then, when ordering a service from the second ISP made it clear that there is already a service at the address and that you are wanting an additional service, not to replace an existing one.

Note that many ISPs have great difficulty in coping with FTTP services provided via a multi-port ONT (I assume their systems are hard coded on the basis that ONTs only have one port) so you need to make sure that the second ISP you order from can cope with the concept. I have no idea whether the two ISPs you mention can (I would home that BT could but I don't know).

I don't think the OP's posts are clear as I've read them several times and came to different conclusions each time, I think for anyone to really help they need to give a clear overview of what they already have and what they want to achieve or what fault they have as I'm not clear if they already have a 4 port ONT with two services or that is what they are trying to achieve.

The whole bit about the ISP suggesting they buy an ONT off eBay sounds crazy as you can't plug and play an ONT without a engineer visit to register it.

Edited by PCJM40 (Thu 05-Feb-26 10:34:04)

Hi Ian,

As I originally said (although probably not very clearly - sorry), the vulnerability is vanishingly small.

Apart from those that have access to the In-Band Management network, i.e. Openreach & the manufacturer, these devices are essentially Layer 2 only, so no access from outwith the individual PON itself.

However, I work on the principle of who knows what vulnerabilities might be discovered in future.

If someone posts the vital statistics, i.e. Make/Model/Firmware/Serial-number of any networked device, to a public forum, that's up to them, but it's a red-flag item to me.

All the best,

In reply to a post by Dassa:

Hi,

I think what you're saying is that you need two FTTP services at one property which only has a single fibre to it?

the op is suggesting he already has two fttp services at one address see original comment below

In reply to a post by TonyTek:

I have two BB Providers: BT Business & Plusnet for private work. What are the likely issues in configuring this modem for both Providers. eg they are on separate FTTP contracts so I will get the indented speeds on the relevant Ports?

I think the op is trying combine both services into one ont - aka the 4 port version.

In reply to a post by Dassa:

Note that many ISPs have great difficulty in coping with FTTP services provided via a multi-port ONT (I assume their systems are hard coded on the basis that ONTs only have one port) so you need to make sure that the second ISP you order from can cope with the concept. I have no idea whether the two ISPs you mention can (I would home that BT could but I don't know).

Most providers are not set up for multiple onts or the four port ont and doesn't take in the serial number for the single port onts.

I am assuming the four port ont has a something like xxxx-xxxx 1 to 4 so that each port gets serialised. That said it can still get unstuck with some systems not being able to understand more than one serial per property.

This should change more so when we have the gpon and xgs combo service

In reply to a post by bit_bucket:

Hello Tony,

With all due respect, I don't think that anyone should be sharing the serial number, of their ONT, with anyone else, excepting their ISP and/or fibre network provider of course.

exactly.....

In reply to a post by bit_bucket:

Make/model/hardware-version/firmware-version not an issue.

Sure, the probability of two random users sharing the same PON or OLT is vanishingly small, but still not good security practice.

a stupidly tiny probability and if the used to whitelist off at the production stage its zero.

In reply to a post by bit_bucket:

Please don't take any offence, whilst I'm am sure that you're not of any nefarious intent, when it comes to security, Zero Trust is the only path to follow.

All the best,

When it comes to things like this - zero trust is the way to go

Seriously seriously try and avoid saying "my real name is David mushroom and my asus ax-86u has 3.0.0.6.102 firmware on it"

You've set your self up for an easier compromise system

but i have veered off of the op topic