I have just been helping a friend with a stability issue. The line drops synch when going on-hook and off-hook on the phone (on 20% occasions). High rate of CRC errors and errored seconds all the time. Home wiring seems OK, I-Plate did not help. Line is very close to the exchange (10dB attenuation d/s and 22Mb/s d/s). Line profile is Fast with only 3dB margin. His sone is a gamer, so I think would be best with a fast line profile but with 6dB margin (sacrifice some speed for stability), and if that does not work, turn on interleaving instead. I know DLM does not allow this degree of manual control, only fast, stable and super stable policies.
How does one go about getting BT Retail to change the DLM policy from Fast to Stable for a line?
hi you can contact the mods and get a noise margin reset and they can also turn interleaving on if you want it this is a link to them http://bt.custhelp.com/app/contact_email/c/4951 they normally reply by email or phone directly to you within 72 hours
They are a UK based BT specialist team who have a good record at getting problems solved
If the phone is causing the line to lose sync, then there is a fault somewhere. It could be a high resistance joint, of a fault on the exchange equipment, assuming that it still does it with a microfilter plugged into the "test" socket, when the I-plate is unscrewed.