Vodafone Full Fibre 500 - low upload speed

Originally on Vodafone 150 FTTH, upload speed was ~28 Mbps
Recently upgraded to the 500 service, contract specified a minimum upload speed of 68 Mbps, but upload speed has not changed, still ~28 Mbps. Download speed is fine.
Speed has been tested on multiple devices and sites (including their own speedtest site).
Vodafone engineers have confirmed no line fault.
Currently undergoing a complaint/investigation.

Aside from Vodafone's service settings, any thoughts on technical reasons why the upload speed would not be able to meet 68 Mbps?

Openreach's availability checker suggests I could achieve speeds of 1600 down but only 115 Mbps up. If GPON can achieve 2.4 Gbps synchronous speeds - aside from Openreach settings - is there a technical reason why we do not get the full GPON speed locally?
Does anyone in UK get full synchronous speeds via Openreach?

I am trying to understand the tech better so I can argue with Vodafone, I am not letting them off the contract easily.

Hi,

In reply to a post by Impending7551:

Originally on Vodafone 150 FTTH, upload speed was ~28 Mbps
Recently upgraded to the 500 service, contract specified a minimum upload speed of 68 Mbps, but upload speed has not changed, still ~28 Mbps. Download speed is fine.
Speed has been tested on multiple devices and sites (including their own speedtest site).
Vodafone engineers have confirmed no line fault.
Currently undergoing a complaint/investigation.

Aside from Vodafone's service settings, any thoughts on technical reasons why the upload speed would not be able to meet 68 Mbps?

Openreach's availability checker suggests I could achieve speeds of 1600 down but only 115 Mbps up. If GPON can achieve 2.4 Gbps synchronous speeds - aside from Openreach settings - is there a technical reason why we do not get the full GPON speed locally?
Does anyone in UK get full synchronous speeds via Openreach?

I am trying to understand the tech better so I can argue with Vodafone, I am not letting them off the contract easily.

Openreach offer a number of different speeds, delivered over the 2.4G(down)/1.2G(up) GPON FTTP infrastructure. The full list is available in BT SIN 506 (which is unfortunately not currently available on the BT's SIN website, presumably in error rather than deliberately but Google might be able to find it - you need version 1.14 or above for the full list of available speeds).

In all probability, you were previously on the 160/30 speed tier and you have now moved to the 550/75 speed tier. Those speeds are enforced by software in the ONT/OLT (and maybe in Vodafone's network), not by the underlying (G)PON which always runs at 2.4/1.2G. The speeds quoted by Vodafone will be less than the Openreach speeds to allow for network overhead and the possibility of congestion, either on the PON itself or within Vodafone's network.

If you are not getting the expected upload speed then that points to a misconfiguration, either in your own equipment (does your router do any traffic prioritisation / shaping?) or in the configuration of the Openreach / Vodafone networks. It is also possible that you are testing via WiFi and for some reason it cannot deliver adequate upload speeds (although WiFi usually manages to be reasonably symmetrical so probably isn't the cause here).

Just to follow up, SIN 506 isn't on the BT website because it is on the Openreach website here.

In reply to a post by Impending7551:

Originally on Vodafone 150 FTTH, upload speed was ~28 Mbps
Recently upgraded to the 500 service, contract specified a minimum upload speed of 68 Mbps, but upload speed has not changed, still ~28 Mbps. Download speed is fine.
Speed has been tested on multiple devices and sites (including their own speedtest site).
Vodafone engineers have confirmed no line fault.
Currently undergoing a complaint/investigation.

Aside from Vodafone's service settings, any thoughts on technical reasons why the upload speed would not be able to meet 68 Mbps?

are you using their router?
how are you testing wired or wifi?

In reply to a post by Impending7551:

If GPON can achieve 2.4 Gbps synchronous speeds - aside from Openreach settings - is there a technical reason why we do not get the full GPON speed locally?
Does anyone in UK get full synchronous speeds via Openreach?

There are two products in the current openreach gpon service that has synchronous - and that is the 1gbit/1gbit, and the 0.5mbit up/down product. Every ont recieves 2.5gbits/1.25gbit in their respective pon, you are capped by software to the speeds you have ordered.

and no you can't hack the unit to give you 2.5gbits.

In reply to a post by Impending7551:

I am trying to understand the tech better so I can argue with Vodafone, I am not letting them off the contract easily.

its not the case of letting them off the hock but working out what is going on that your stuck on 28mbits and not 75mbits upload

There are no "synchronous" services (*). But there are some which are symmetric.

(* Apart from certain types of leased lines delivered on legacy serial interfaces or TDM. Just before the ultra-pedants chime in)

If the upload is stuck at 28M, it could be a BRAS profile on Vodafone end (although those usually only shape in the downstream direction), or an issue with the local router config.

In reply to a post by candlerb:

There are no "synchronous" services (*). But there are some which are symmetric.

I should have corrected the op, but didn't my bad.

In reply to a post by candlerb:

(* Apart from certain types of leased lines delivered on legacy serial interfaces or TDM. Just before the ultra-pedants chime in)

and i assume EoFTTP etc. but for consumer products theres only two the 1gbit one (type c areas only) the 0.5mbit one for voip.

In reply to a post by candlerb:

If the upload is stuck at 28M, it could be a BRAS profile on Vodafone end (although those usually only shape in the downstream direction), or an issue with the local router config.

Could be bras, untill we know how he's testing we can't be sure what is going on. Also it could be a stuck/"stale" session but hes rebooted so that leaves that one .

When we upgraded from 100 to 150 our upload speed didn't change from 18 Mb/s for nearly 6 months. I didn't take much notice but we started having problems with wi-fi on the VF router limiting download performance. While trying various procedures to overcome that the upload speed jumped from 18 to 28 Mb/s after a reboot.