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Does anyone know which providers still use a separate Openreach modem for G.Fast?
I'd like to use my own router (Asus RT-AX88U) and from what I can see most (all?) ISP supplied routers cannot be used in modem only mode / bridged and I'm keen to avoid double NAT or the cost of purchasing a separate G.Fast capable modem.
From what I found, TalkTalk looks like you get a separate Openreach modem, but then in the sign up process for Fibre 150 it said both "Expert installation included" and "No Engineer install required" . It looks like I'll be sent their "Wifi Hub" (SAGEMCOM 5364) which doesn't support G.Fast though, so I'm guessing that means it would need an engineer visit with Openreach Modem.
It would be good to have more options though, even if you do get a separate Openreach Modem with TalkTalk.
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I am with TalkTalk Business (smaller ISP Unchained ISP) who will provided you Openreach Modem, free installation, free set up and free static IP Address. The isp are excellent. G.fast 160/30 cost you £49.99 for 12 months. If you want 330/50 you pay little extra £56.99 for 12 months. Stroll down the page for G.fast https://www.unchainedisp.net/home-broadband.html
Edited by adslmax (Wed 12-Jan-22 13:14:31)
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I'm with TalkTalk home, and they provided a G.Fast modem and their own router (which i've kept in a cupboard just in case i need to troubleshoot with them) works perfectly with my Unifi Security Gateway (configured as DHCP)
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Thanks both, I went with TalkTalk in the end and later in the order process it let me pick a date for the Openreach engineer to visit (it still said no engineer required earlier in the process though).
Thanks for the replies.
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The newer BT Business Smart Hubs support G.Fast, aren't locked to BT and can be put in to bridge mode.
They can be picked up fairly cheap on eBay.
They likely provide some (limited) line statistics unlike the completely locked down Openreach MT992 modems.
The Openreach modem should serve you just fine though. Just offering another option.
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The thing with line stats though is you can get easily obsessed with them, though they can be quite useful. There are pros and cons to having FTTP, in that sense. 
BT FTTP 900/110
Colaton Raleigh Exchange
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I use Zyxel Gfast Router with excellent full stats with dslstats are useful far better than locked down Openreach Gfast Modem. The raspberry pi wil monitoring it 24/7 running dslstats with my server online webserver to kept an eyes on stats each days from my mobile or tablet.
Edited by adslmax (Thu 13-Jan-22 16:12:34)
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That's the problem though, Max. You don't need to be looking at the stats, unless there's a problem.
BT FTTP 900/110
Colaton Raleigh Exchange
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You have an online webserver max?
Hmmm.
And a Rasperry Pi running dslstats?
Ummm. Maybe. Maybe not.
Connections: OnePlus 8 Pro on Three 4+ (LTE)/5G and at home Three Mobile, with (Three)ZTE MF286D router giving about 113/20Mbps.
===========================================================================
“I have hardly ever known a mathematician who was capable of reasoning.” (Plato)
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That's the problem though, Max. You don't need to be looking at the stats, unless there's a problem.
These ones give far less to look at.
| Text | 1
23
45
67
8 | ONT Information
Current Value Reference ValueOptical Signal Sending Status: Auto Auto
TX Optical Power: 2.26 dBm 0.5 to 5 dBmRX Optical Power: -13.07 dBm -30 to -8 dBm
Working Voltage: 3237 mV 3100 to 3500 mVBias Current: 11 mA 0 to 90 mA
Working Temperature: 36 ℃ -10 to +85 ℃ |
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Nah that’s no good Carl. Your bias current is [censored]. You need to turn that sucker waaaay up 🤣
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Nah that’s no good Carl. Your bias current is [censored]. You need to turn that sucker waaaay up 🤣
1.21 Jiggawatts!
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In all seriousness the received power level is stronger than I would have expected. Minimum 16.5dB loss from a 32-way split... I think the Huawei OLT has a max TX of +7, so not a huge amount left.
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The OLT reports its transmit power. I'll have a look when I'm back.
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Depends on the class of optics in the OLT. They could be using a higher class than the ONT.
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I think my line was -21dB when tested, they tried another port an it was worse, wasnt sure if thats good or bad, but ive had no issues since it going in
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From what I can see Openreach are using the Huawei MA5800-X17, on a brief search all the line cards I found were designed for C+ optics which max at +7dBm. That's not to say they don't have a C++ option.
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I think my line was -21dB when tested, they tried another port an it was worse, wasnt sure if thats good or bad, but ive had no issues since it going in
That's more like what I'd expect, C+ sensitivity is (I think) -32 so you should have no issues.
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In all seriousness the received power level is stronger than I would have expected. Minimum 16.5dB loss from a 32-way split... I think the Huawei OLT has a max TX of +7, so not a huge amount left.
Not sure what you mean. Rx power is -13.07 dBm and has a minimum of -30 dBm, so there is *tons* of headroom. Tx power is bang within the middle of expected range too.
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I'm not at all concerned that it won't work - I'm actually surprised that the signal is so strong. I'd be very happy to see such a signal level when I get OR FTTP.
There is a minimum loss of 16.5dB due to the 32-way splitter, so if the OLT is transmitting at 5dBm that only allows 1.5dB for all the splices, connectors, and loss in the length of fibre itself.
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Did you manage to "unlock" the Openreach ONT to get these stats?
BT FTTP 900/110
Colaton Raleigh Exchange
Edited by Grimers (Sat 15-Jan-22 15:49:27)
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The OLT reports its transmit power. I'll have a look when I'm back.
| Text | 1
23
4 | OLT Information
Current Value Reference ValueOptical module type: Class B+ --
Transmit optical power: 3.8 dBm 1.5 to 5 dBm |
Losing just under 17 dBm on the path, so 15 dBm for the splits and a total of 2 dBm for insertion loss and loss within the fibres themselves.
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That's pretty low really - the exchange must be fairly close (under 2 miles??) and/or the path losses for splices and connectors are all excellent.
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I think my line was -21dB when tested, they tried another port an it was worse, wasnt sure if thats good or bad, but ive had no issues since it going in
That's more like what I'd expect, C+ sensitivity is (I think) -32 so you should have no issues.
From Carl's extract the OLT is running Class B+ optics
I just had a look at my ONT (Huawei HG8110H-20) and that is also Class B+
Looks like Carl's replacement 4-port ONT is actually Class C+ (TX power 0.5 to 5 dBm and RX sensitivity -30 dBm).
From what I can see the only difference between Class B+ and Class C+ at the ONT is increased receive sensitivity from -27 dBm to -30 dBm (which is twice as good!). The upstream TX power from the ONT is the same for both B+ and C+ optics at 0.5 to 5 dBm.
At the OLT - Class C+ (3 to 7 dBm) clearly puts out a lot more power than B+ (1.5 to 5 dBm), but Openreach appear to be using B+ at the headend (and in standard issue Class B+ at the ONT)
Edit: corrections!!
Edited by Pheasant (Sun 16-Jan-22 10:00:37)
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That's pretty low really - the exchange must be fairly close (under 2 miles??) and/or the path losses for splices and connectors are all excellent.
I agree - especially when you consider that 15dB is the theoretical minimum loss for a 32-way split, most manufacturers quote around 16.2-16.5dB.
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