I'm using Bsnl 500 Plan according to which i get 2MBPS upto 10GB and after that 1MBPS but as per Happy Browsing offer till septembet all BSNL users gets 2MBPS flat even after FUP limit but my BB speed won't go above 1MBPS i've downloaded many things to check the speed but it always shows above 130-120KBPS i've also tried other devices if for any chance my device would be faulty but all other devices showed same speed. While i speedtest it would jump to 2MBPS at start but slowly over time decrease down to 1.2-1.3MBPS. I've changed any DSL setting default, till now my XDSL statistics are as follows

Mode: ADSL_2plus
Traffic Type: ATM
Status: Up
Link Power State: L0

Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (0.1 dB): 96 113
Attenuation (0.1 dB): 385 255
Output Power (0.1 dBm): 199 126
Attainable Rate (Kbps): 6,476 876

Path 0 Path 1
Downstream Upstream Downstream Upstream
Rate (Kbps): 4,089 510 0 0

MSGc (# of bytes in overhead channel message): 102 37 0 0
B (# of bytes in Mux Data Frame): 10 26 0 0
M (# of Mux Data Frames in FEC Data Frame): 1 2 0 0
T (Mux Data Frames over sync bytes): 7 1 0 0
R (# of check bytes in FEC Data Frame): 6 10 0 0
S (ratio of FEC over PMD Data Frame length): 0.849 3.2611 0.0 0.0
L (# of bits in PMD Data Frame): 1,601 157 0 0
D (interleaver depth): 352 8 0 0
Delay (msec): 7.47 6.52 0.0 0.0
INP (DMT symbol): 5.27 2.3 0.0 0.0

Super Frames: 2,922,725 2,641,680 0 0
Super Frame Errors: 99,803 6,605 0 0
RS Words: 1,888,087,847 1,914,368 0 0
RS Correctable Errors: 4,960,289 178,521 0 0
RS Uncorrectable Errors: 998,002 0 0 0

HEC Errors: 643,831 18,275 0 0
OCD Errors: 979 0 0 0
LCD Errors: 979 0 0 0
Total Cells: 386,533,929 48,092,746 0 0
Data Cells: 18,849,115 1,811,806 0 0
Bit Errors: 0 592,787 0 0

Total ES: 3,717 1,776
Total SES: 1,973 311
Total UAS: 889 924