Another ADSL+2 query

Question

Hi all, see below for my stats - recently been switched to ADSL+2 (had confirmation email from BT) really please at first at connected at 16Mb/s but then after a day or two it's gone down to 9Mb/s, which is where it seems stuck - surely I should be getting faster speeds?
Used to get between 6 and 8 Mb/s anyway, so any ideas?
ADSL line status
Connection information
Line state
Connected
Connection time
0 days, 4:36:27
Downstream
9,727 Kbps
Upstream
1,059 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.5
Latency type
Interleaved
Noise margin (Down/Up)
23.4 dB / 5.9 dB
Line attenuation (Down/Up)
12.5 dB / 2.5 dB
Output power (Down/Up)
0.0 dBm / 12.2 dBm
Loss of Framing (Local)
12
Loss of Signal (Local)
1
Loss of Power (Local)
0
FEC Errors (Down/Up)
0 / 0
CRC Errors (Down/Up)
0 / N/A
HEC Errors (Down/Up)
N/A / 0
Error Seconds (Local)
1
Solved!
Go to Solution.

Answer 1

There's lots of myths and opinions on the 10 day period. I deal with DSL connections every day and below I'll explain exactly how it works.
The first 10 days is used to determine the fault threshold rate for the line. The FTR is something that is set to allow a fluctuation in sync speed (as it's rate adaptive) without it being deemed a fault.  I believe that the FTR is set at 80% of the lowest sync rate over the first 10 days.
If you start messing around in the first 10 days then you could affect the fault threshold rate and have an unrealistic FTR for your line which could in future hinder you getting an fault looked into.
For example. If you have a line that is capable of 15meg but during the first 10 days you turn it on and off when using the internet, or have it plugged into a dodgy extension which causes the line to sync at 4meg then the FTR would be set at about 3200kbps. Now, if you remove the faulty extension and achieve the 14 or 15meg but then get a fault at some point in the future between your home and the exchange and your speed drops to 6 meg, BT Wholesale wouldn't have to accept and investigate the fault as it's connecting above the fault threshold rate. Even though your line is capable and has been achieving more.
As mentioned above DLM works in the same way from day 1 of a circuit. If it's a good line and no noise you'll get the best the line can support but if some noise develops then DLM will do its job. Just as it would do if you didn't experience the noise until 6 months after the circuit was installed.
When an SNR reset is done on a circuit it causes the circuit to be re-entered into a 10 day period and the FTR is recalculated. The main purpose for this is if you've had a faulty line since installation which has subsequently been fixed then your line can be given a more realistic FTR value 
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