Good morning,
I have two questions:
1/ We have seen a substantial reduction in VDSL connection rate. Typical rates at this property would be 35Mb/s, we are currently clocked in at 23.5Mb/s. (BT's "Stay fast guarantee" is at 26Mb/s here so there is definitely an issue to raise). Real download speeds reported from BT wholesale performance and ookla are 20Mb/s so this all ties up.
I have been tidying up wiring in an effort to improve speeds over the last few days so I suspect an automatic IP profile caused by some frequent disconnects, but I have not changed anything since we were happily clocked in at 35Mb/s. Will attach modem and cabinet stats below. Is is possible someone takes a look and identifies if this is likely a cap issue?
2/ In reality we are not seeing anything like the upstream rate the modem is clocked in at, currently 7Mb/s. BTW speed test shows a burst of 5Mb/s followed by a rapid throttling down to 2Mb/s stable upload rate. This is backed up by ookla.
I notice a big reduction in SNR during high downloads, so I wondered if the line was self-throttling (e.g. a crosstalk issue) for some reason. Alternatively, ts the throttling part of a customer profile? I understood a 2Mb/s cap used to be applied and am hoping that this might be a hangover of a previous contract (upload rate getting important with video calls etc being more prevalent). Obviously I am keen to improve real upload speeds to match what the line is capable of.
We are Fibre 1 subscribers.
Thank you in advance for your support.
BTW advanced diagnostic (this is what makes me think a profile has been applied):
Advance Test
Download Test
Download speed achieved during the test was 20.24 Mbps
For your connection, the acceptable range of speeds is 20 - 21.33 Mbps
IP Profile for your line is 21.33 Mbps
Upload Test
Upload speed achieved during the test was 5.96 Mbps
IP Profile for your line is 10 Mbps
Exchange checker results:
Exchange DIDMARTON is served by Cabinet E2
Featured Products Downstream Line Rate(Mbps) Upstream Line Rate (Mbps) Downstream HandbackThreshold(Mbps) WBC FTTC Availability Date WBC SOGEA Availability Date Left in JumperHigh Low High Low VDSL Range A (Clean)
VDSL Range B (Impacted)
| 40 | 25 | 7.9 | 6 | 20 | Available | Available | -- |
| 39.1 | 21.4 | 7.8 | 5.7 | 17.7 | Available | Available | -- |
Featured Products Downstream Line Rate(Mbps) Upstream Line Rate (Mbps) Downstream Range (Mbps) Availability Date FTTP Install ProcessFTTP on Demand
ADSL Products Downstream Line Rate (Mbps) Upstream Line Rate (Mbps) Downstream Range(Mbps) ADSL Availability Date WBC SOADSL Availability Date Left in JumperWBC ADSL 2+WBC ADSL2+ Annex MADSL MaxWBC Fixed RateFixed Rate
| Up to 2 | -- | 1 to 3.5 | Available | Available | -- |
| Up to 2 | Up to 0.5 | 1 to 3.5 | Available | Available | -- |
| Up to 1.5 | -- | 1 to 2.5 | Available | Available | Yes |
| 0.5 | -- | -- | Available | Available | -- |
| 0.5 | -- | -- | Available | -- | Yes |
Observed Speeds VDSLMax Observed Downstream SpeedMax Observed Upstream SpeedObserved Date
Other Offerings Availability DateVDSL MulticastADSL Multicast
Premise Environment StatusBridge TapVRINTE FacePlateLast Test Date
Exchange Product Restrictions StatusFTTP Priority ExchangeWLR WithdrawalSOADSL Restriction
Modem stats (Billion 8800NL though I do have a HH4b here if required for testing)
| xDSL |
| Mode | VDSL2 |
| Traffic Type | PTM |
| Status | Up |
| Link Power State | L0 |
| |
| | Downstream | Upstream |
| Line Coding (Trellis) | On | On |
| SNR Margin (dB) | 5.1 | 5.9 |
| Attenuation (dB) | 26.2 | 0.0 |
| Output Power (dBm) | 10.1 | 2.9 |
| Attainable Rate (Kbps) | 22674 | 7027 |
| |
| Rate (Kbps) | 23465 | 7027 |
| |
| B (# of bytes in Mux Data Frame) | 227 | 207 |
| M (# of Mux Data Frames in an RS codeword) | 1 | 1 |
| T (# of Mux Data Frames in an OH sub-frame) | 0 | 38 |
| R (# of redundancy bytes in the RS codeword) | 10 | 8 |
| S (# of data symbols over which the RS code word spans) | 0.3090 | 0.9396 |
| L (# of bits transmitted in each data symbol) | 6161 | 1839 |
| D (interleaver depth) | 4 | 1 |
| I (interleaver block size in bytes) | 238 | 108 |
| N (RS codeword size) | 238 | 216 |
| Delay (msec) | 0 | 0 |
| INP (DMT symbol) | 53.00 | 0.00 |
| |
| OH Frames | 0 | 0 |
| OH Frame Errors | 0 | 11 |
| RS Words | 34823760 | 11495532 |
| RS Correctable Errors | 153568 | 8 |
| RS Uncorrectable Errors | 0 | 0 |
| |
| HEC Errors | 0 | 0 |
| OCD Errors | 0 | 0 |
| LCD Errors | 0 | 0 |
| Total Cells | 121843526 | 0 |
| Data Cells | 1716968 | 0 |
| Bit Errors | 0 | 0 |
| |
| Total ES | 0 | 10 |
| Total SES | 0 | 0 |
| Total UAS | 0 | 0 |
