New BT Broadband and high FEC/CRC Errors

Question

Hi all,
Firstly wow what a good idea this forum is, I'm very impressed with the help people have been getting from the mods etc so I thought I'd ask my questions rather than getting frustrated with call centres.
I was with orange and having a nightmare so have moved to BT for my broadband, my speeds with orange were 1152kbps so it was clear ym line was capped, always reconnected at that speed. Moved to BT have a hub 3 and its been connected for 3 days now, generally getting between 2-2.5MBPS which is a great improvement. That said however I am noticing high CRC and FEC erros. I know where I live is quite far from the exchange though the main trunk along the road has been getting upgraded with fibre.
I have just rebooted the box so the stats are not ideal, but below is 10 mins worth of data (before the restart of the bub I had thousands of CRC/FEC errors). How does this look ? I have an accelerator plate on to remove any noise from extensions, bell wires etc within the property.
Line state:
Connected
Connection time:
0 days, 00:11:33
Downstream:
2.188 Mbps
Upstream:
448 Kbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.1 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
6.9 dB / 21.0 dB
Line attenuation (Down/Up):
57.7 dB / 31.5 dB
Output power (Down/Up):
17.5 dBm / 12.6 dBm
FEC Events (Down/Up):
214 / 0
CRC Events (Down/Up):
1 / 0
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
4 / 0
Error Seconds (Local/Remote):
1 / 0
 I notice some people have latency type as fast and mine is interleaved, what does this mean please ?

Answer 1

Hi Mike
Welcome to BT's broadband help forum.
ADSL uses basically 2 modes of operation for delivering broadband.
Your broadband is ADSLmax .... up to 8M, and to do it effectively, the line control that helps deliver the product has to evaluate the condition and efficiency of your phone line, and as you've stated, you live in the sticks away from the exchange, which does impose a greater challenge on the broadband. Those challenges come from phone line condition, environmental influences. If conditions are right, it will run it successfully using fastpath .... which is in effect pure ADSL modulating the signals without having to correct huge amounts of errors.
But with longer lines, like yours, fastpath is a rare condition unless the line is really top notch, and most aren't.
So what happens then is that the exchange imposes a form of corrective line control, and using mathmatical algorithms, to correct the errors for you automatically ... and you see this in the form of FEC errors, forward error correction.
It's perfectly normal, and the huge figures you see are typical, depending on how long the line has established its connection for, with the exchange.
At the moment your line is a typical line on ADSLmax, with a good noise margin.