Modulation suddenly changed

Hello
The modulation on my homehub has suddenly changed from G.992.5 Annex A to G.992.3 Annex A and my speeds have dropped dramatically from Downstream 5,759 Kbps & Upstream 1,008 Kbps to Downstream 1,603 Kbps & Upstream 1,100 Kbps. There is apparently a telephony problem in my area affecting ISDN lines which I assume may be affecting my broadband as well. Can I assume that after this problem is fixed the modulation on my homehub and speeds will automatically revert to what they were, or will I have to do something ?
Thanks for your help

Hi - thank you for the pointers.
I have a HomeHub2 and it is plugged into the master test socket.
on 14th December my ADSL stats were as follows:
ADSL line status
Connection Information
Line state Connected
Connection time 5 days, 12:48:51
Downstream 5,759 Kbps
Upstream 1,008 Kbps
ADSL Settings
VPI/VCI 0/38
Type PPPoA
Modulation G.992.5 Annex A
Latency type Interleaved
Noise margin (Down/Up) 10.7 dB / 7.7 dB
Line attenuation (Down/Up) 44.1 dB / 23.8 dB
Output power (Down/Up) 9.4 dBm / 1.5 dBm
Loss of Framing (Local/Remote) 0 / 0
Loss of Signal (Local/Remote) 0 / 0
Loss of Power (Local/Remote) 0 / 0
FEC Errors (Down/Up) 40076 / 0
CRC Errors (Down/Up) 42899 / 0
HEC Errors (Down/Up) 25526935 / 0
Error Seconds (Local/Remote) 34923 / 0
Hide Details
Software version 4.7.5.1.83.3.37 (Type B) | Time and date 05:51 14/12/12
This morning my ADSL stats are as follows:
ADSL line status
Connection Information
Line state Connected
Connection time 0 days, 03:52:08
Downstream 1,603 Kbps
Upstream 1,100 Kbps
ADSL Settings
VPI/VCI 0/38
Type PPPoA
Modulation G.992.3 Annex A
Latency type Interleaved
Noise margin (Down/Up) 18.1 dB / 7.7 dB
Line attenuation (Down/Up) 39.7 dB / 23.8 dB
Output power (Down/Up) 4.7 dBm / 1.6 dBm
Loss of Framing (Local/Remote) 0 / 0
Loss of Signal (Local/Remote) 0 / 0
Loss of Power (Local/Remote) 0 / 0
FEC Errors (Down/Up) 0 / 0
CRC Errors (Down/Up) 0 / 0
HEC Errors (Down/Up) 0 / 0
Error Seconds (Local/Remote) 0 / 0
Hide Details
Software version 4.7.5.1.83.3.37 (Type B) | Time and date 08:36 15/12/12
And the associated speedtester results are as follows:
1. Best Effort Test: -provides background information.
Download Speed
1.23 Mbps
0 Mbps 2 Mbps
Max Achievable Speed
Download speedachieved during the test was - 1.23 Mbps
For your connection, the acceptable range of speeds is 0.8 Mbps-2 Mbps.
IP Profile for your line is - 1.41 Mbps
2. Upstream Test: -provides background information.
Upload Speed
0.55 Mbps
0 Mbps 0.83 Mbps
Max Achievable Speed
Upload speed achieved during the test was - 0.55Mbps
Additional Information:
Upstream Rate IP profile on your line is - 0.83 Mbps
The quiet line test has a lot of hiss but no crackles.
Could all this just be down to the local telephony problem ? If so will everything revert once the BT report that the have fixed the telephony problem in my area or will I have to do something to get things back to how they were ?
Thanks again

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