Is this a good connection speed?

I don't think my broadband speed is up to par,

these are my stats;

Annex: B
Line Mode: G.993.2 (VDSL2)
Profile: 17a
Line State: UP [0x801: showtime_tc_sync]
Forward Error Correction Seconds (FECS): Near: 0 / Far: 1044
Errored seconds (ES): Near: 0 / Far: 4
Severely Errored Seconds (SES): Near: 0 / Far: 0
Loss of Signal Seconds (LOSS): Near: 0 / Far: 0
Unavailable Seconds (UAS): Near: 84 / Far: 84
Header Error Code Errors (HEC): Near: 0 / Far: 0
Non Pre-emtive CRC errors (CRC_P): Near: 0 / Far: 0
Pre-emtive CRC errors (CRCP_P): Near: 0 / Far: 0
Power Management Mode: L0 - Synchronized
Latency [Interleave Delay]: 0.14 ms [Fast] 0.0 ms [Fast]
Data Rate: Down: 24.928 Mb/s / Up: 9.988 Mb/s
Line Attenuation (LATN): Down: 9.4 dB / Up: 28.2 dB
Signal Attenuation (SATN): Down: 5.2 dB / Up: 28.1 dB
Noise Margin (SNR): Down: 3.4 dB / Up: 5.9 dB
Aggregate Transmit Power (ACTATP): Down: 7.4 dB / Up: 10.1 dB
Max. Attainable Data Rate (ATTNDR): Down: 26.853 Mb/s / Up: 10.157 Mb/s

I think I am about 300m max from the FTTC, but will double check this

Have you tried connecting via the test socket behind the master socket? This is needed as a start to rule out issues with internal wiring and tells us what the line is actually capable of.

Also, your 300m max as the crow flies may be very different as your line could be going the "long way" to get to the cabinet - where I used to live was about 300m as the crow flies from the cabinet but in reality the line went around the estate and was more like 600m.

Also have seen people identify the wrong cabinets before now e.g. virgin media ones or just the wrong openreach one

Looking at your attenuation figures, it seems your router / modem is displaying the figures the wrong way round.

28db is a lot longer than 300m unless there is a line fault or dodgy extension cable somewhere. That's more like 700m+

Your noise margin of 3.4db - if reported correctly shows your on a 3db profile - very little errors.

Try the test socket but in all honesty, it's a clean but long line from looking briefly at the stats. Be surprised if the line improves at the test socket.

thanks for the suggestions.

I've checked my cabinet number on btwholesale, which tells me it's cabinet 1.
My local council planning site shows Installation of Broadband Cabinet | PCP001 on a map. I can also see 001 painted on the cabinet.

The distance by road is 482 metres, and 300 as the crow flies. Even at 482m, I think I should be getting more than 24Mbps?

Still need you to test via the test socket when you can - this then rules out issues within your house.

Wires don't necessarily travel straight to the cabinet - there are instances where they travel away from the cabinet on one side of the road to then cross the road and come back towards the cabinet - this could add significant distance to the cable. Without actually tracing the cable in the ground (or on poles which would be easier if they are overhead) then it is difficult to know actual route.

What is the range of predictions on the BT Wholesale checker?

In reply to a post by ian72:

Wires don't necessarily travel straight to the cabinet - there are instances where they travel away from the cabinet on one side of the road to then cross the road and come back towards the cabinet - this could add significant distance to the cable. Without actually tracing the cable in the ground (or on poles which would be easier if they are overhead) then it is difficult to know actual route.

Not to mention that the VDSL cabinet may be a non-trivial distance away from the PCP. In my case it adds about 80m, although I think that's towards the upper end of what's allowed.

As mentioned, you neeed to consider teh postential for cporssing road, going round loops, or down sidestrees; then add the distance between te PCP and FTTC cabinets, plus the distance up/down poles ... An extreme example occurs with some friends: house to exchange (straight line) - 800m; by road - 1.5km; actual line length exceeds 9 km.

If it was 482m then you should be seeing a sync in high 70s, or maybe even into te 80s. Put teh unknownsd in and you coudl be well down.

What does the BT checker say for your number and also, your neighbours on either side.

My FRITZ!Box says its 563m from the box. Knowing the run of the ducts I think that's reliable. I take it that not all routers report a distance then. But my router must be calculating it or obtaining data from somewhere. Can a line length be worked out for any router?

Can be worked out from the attenuation and will assume a certain attenuation per km of cable.

There are probably three ways I can think of to measure it with reasonable accuracy: Would any give resilution of 1m? unlikely.

A tape measure

TDR (time domain reflectomenter). There may be a cheap TDR implemented in the modem ... it would give reasonable rsults however they need interpreting correctly.

Ultra accurate measuring of a ping - altrhough for 10 metres that would be 33nS (or there abouts) and does not account for any processing/switching time.


Someone else may have another sugestion.

In reply to a post by MrSaffron:

Can be worked out from the attenuation and will assume a certain attenuation per km of cable.

As you say the attenuation per km would have to be assumed although in reality cable attenuation can be affected if aluminium is used for some or all of of the D side and also if different thickness of the conducting pair is taken into consideration.

That would be a big assumption ... underground cables can have 19, 22, 24, 26 AWG - 0.9, 0.63, 0.5, 0.4 mm diameter and the atteuations will be massively different from around 28dB/km down to 12dB/km at 1MHz with a simlar variatioin at te standard 300kHz point. And as is often te case there will be more than one size in any cabinet to house.

It is a big assumption but its the calculation they make

If that is the case then the 563m referred to could be anywhere from 250m up to 1.2 km - so a totally pointless figure.