topic Re: FTTC Very High SNR whats the procedure now in Broadband

FTTC Very High SNR whats the procedure now

Interceptor121 — Sun, 16 Nov 2025 19:19:36 GMT

I just moved home and after some issues I am back on line

I am using my old openreach Huawei modem that I had stored when I moved to fibre. The new address has only FTTC so I went back to the old connection

My modem reports a very safe 20,1 dB download with resulting capped speed while it has zero SNR in upload and is connecting very fast for FTTC

Connection is stable looks like the new FTTC do not do anything to improve speed after over a week without disconnections

Line Status

Help

	Downstream	Upstream
Attainable rate (kbit/s)	48968	18584
SNR margin (dB)	20.1	0
Line attenuation (dB)	6.8	6.8
Output power (dBmV)	6.8	6.8

Openreach reported a maximum of 67 mbps but this looks unlikely with 20dB SNR margin

Plusnet says this is within the guaranteed speed which was a low 40 Mbps so don't want to do anything

Re: FTTC Very High SNR whats the procedure now

jab1 — Sun, 16 Nov 2025 19:35:57 GMT

Do you not have a PN Hub2? You must have the cab in your front garden with those attenuation figures - although all four of them at 6.8 make me a little suspicious.

Does whatever router you are using have any more useful data?

Re: FTTC Very High SNR whats the procedure now

Interceptor121 — Sun, 16 Nov 2025 20:15:35 GMT

They sent me a hub2 that has nothing useful
The cabinet is not far anyway the snr margin is a bit high
There are almost no HEc or fec error on download but plenty on upload
Line is very stable with no blips to be fair I haven’t experienced any issues as almost all my subscriptions are no longer 4k

Re: FTTC Very High SNR whats the procedure now

jab1 — Sun, 16 Nov 2025 20:18:08 GMT

Which router are you using then - the data you posted in your original post is a little 'sparse', shall we say?

Re: FTTC Very High SNR whats the procedure now

Interceptor121 — Sun, 16 Nov 2025 20:54:50 GMT

I use an openreach modem Huawei Echolife combined with an Asus RT-AX86S which when I had fiber to the premise was connected directly to the WAN.

Those are the statistics of the modem

Statistics

Help

	Path 0		Path 1
	Downstream	Upstream	Downstream	Upstream
Line rate (kbit/s)	46509	18249	0	0
CRC errors	240	255	18	0
FEC errors	0	0	0	0
HEC errors	122	4294967290	32	0

Path0 is the WAN

Almost no error that show a very solid downstream and plenty of upstream HEC as the SNR margin is zero

The plusnet hub does not go any faster and in terms of performance is pathetic compared to my Asus. I have around 25 wifi clients

Re: FTTC Very High SNR whats the procedure now

jab1 — Sun, 16 Nov 2025 21:04:10 GMT

Fair enough - I may be wrong - I have no experience/knowledge of ASUS kit, but I seem to recall from previous posts where ASUS kit was involved that its figures could be a little misleading.

I think I'll leave this for someone with greater knowledge.

@Dan_the_Van ?

Re: FTTC Very High SNR whats the procedure now

Townman — Thu, 20 Nov 2025 19:15:27 GMT

@Interceptor121 wrote:
They sent me a hub2 that has nothing useful

Nothing useful in what way? It is the defacto reference router for Plusnet services. I think those stats for the router you are using look suspect - sight of what the Hub 2 reports would be more reassuring.

The reported ZERO US SNRM is very suspicious as is the massive HEC counter. I would not rule out a defective router.

Re: FTTC Very High SNR whats the procedure now

Interceptor121 — Thu, 20 Nov 2025 20:04:16 GMT

It is not a router it is an open reach modem whichbis perfetctly working as per engineer that came to fix the btokem build of the connection
The hub2 doesnt have enough wifi bandwidth for my lan and doent Connect any faster

Re: FTTC Very High SNR whats the procedure now

RealAleMadrid — Thu, 20 Nov 2025 20:07:44 GMT

@Townman The stats are from the unlocked Huawei HG612 modem GUI which is known to be bug ridden so are mostly wrong.

Correct stats can be obtained using the telnet xdslcmd info --stats command.

Re: FTTC Very High SNR whats the procedure now

Townman — Thu, 20 Nov 2025 20:26:02 GMT

@Interceptor121

Modem / router are semantics in context which is not worth your nitpicking. Inaccurate stats are far from helpful in diagnosing line performance issues.

Good luck in chasing your own solutions with a broken measuring stick.

Re: FTTC Very High SNR whats the procedure now

Interceptor121 — Thu, 20 Nov 2025 21:22:07 GMT

This is useful
The modem was in the loft for 2+ year and I had forgot about the telnet
Having said that I already binned hub2 once and wont use it period
Will post some stats of they sre any different
If I see snr 6 problem closed

Re: FTTC Very High SNR whats the procedure now

Interceptor121 — Thu, 20 Nov 2025 22:40:26 GMT

So after having people bashing around but not telling me anything useful I found the way forward

The plusnet hub2 can be used in bridge mode (nobody had suggested this when i said I needed LAN speed and reach)

After doing that and connecting a LAN cable to another port of my asus I got the real stats

Data rate:18.066 Mbps / 50.403 Mbps

Maximum data rate:18.066 Mbps / 51.575 Mbps

Noise margin:6.0 / 6.3

Line attenuation:6.3 / 19.5

Signal attenuation:6.5 / 19.8

I had uploaded a hacked firmware to my huawei with the stats but somehow it reset and the stat command did not work

Using bridge mode means if I have a problem I can also do this without having to run into proboem with plusnet

Noise marging is normal and the connection is a tiny bit faster lets see if the line ever goes in training

Case closed

Re: FTTC Very High SNR whats the procedure now

Townman — Thu, 20 Nov 2025 23:24:05 GMT

Well those stats look more sensible.

As for advice that the Hub2 can be used in bridge mode … you were so adamant that it is a useless piece of junk … there seemed little point bothering trying to reason.

The stats reported by the hub 2 are markedly different to those from the rather old device you were betting the bank on. One wonders if there was more going wrong with the device than just questionable stats.

Using the Hub2 as a baseline set of stats I would expect somewhat better performance. My line reports 19.9dB attenuation but runs at 80Mbps with a SNRM of 4.2dB.

Data rate:14.779 Mbps / 79.999 Mbps

Maximum data rate:15.126 Mbps / 83.533 Mbps

Noise margin:5.3 / 4.2

Line attenuation:9.1 / 19.9

Signal attenuation:9.1 / 25.1

You might get a bit more if the DLM dials down the SNRM if the line is stable. However there’s the possibility that the line is being managed with a high level of interleaving. Might be worth raising a support query.