AFAIK SRA should be virtual noise support, please check i'm not totally sure:
root@modem:~# dsl_cpe_pipe.sh lfcg 0 0
nReturn=0 nDslMode=0 nDirection=0 bTrellisEnable=1 bBitswapEnable=1 bReTxEnable=0 bVirtualNoiseSupport=0 b20BitSupport=-1
root@modem:~# dsl_cpe_pipe.sh lfcg 0 1
nReturn=0 nDslMode=0 nDirection=1 bTrellisEnable=1 bBitswapEnable=1 bReTxEnable=0 bVirtualNoiseSupport=0 b20BitSupport=-1
dsl_cpe_pipe.sh lfcg 1 0
nReturn=0 nDslMode=1 nDirection=0 bTrellisEnable=1 bBitswapEnable=1 bReTxEnable=1 bVirtualNoiseSupport=1 b20BitSupport=-1
root@modem:~# dsl_cpe_pipe.sh lfcg 1 1
nReturn=0 nDslMode=1 nDirection=1 bTrellisEnable=1 bBitswapEnable=1 bReTxEnable=1 bVirtualNoiseSupport=1 b20BitSupport=-1
lfcg x x there are 2 stets and two directions up/down, you can change them with:
dsl_cpe_pipe.sh lfcs 0 0 x x x x x
dsl_cpe_pipe.sh lfcs 0 1 x x x x x
dsl_cpe_pipe.sh lfcs 1 0 x x x x x
dsl_cpe_pipe.sh lfcs 1 1 x x x x x
and use 0 for off 1 for on and -1 for not specified (if i recall correctly)