Enabling SRA (seamless rate adaptation) for vdsl

Installing and Using OpenWrt Network and Wireless Configuration
1

Hi there,

I've been using openwrt 18.06.2 on my netgear dm200 with great success for some time now on a VDSL2 connection to the NBN here in Australia (FTTN).

My service provider requested that I enable SRA (seamless rate adaptation according to them) for the purposes of debugging some recent dropouts I've been experiencing but I'm having trouble figuring out if it's even a feature on openwrt and, if so, how to enable it.

I'm using version 10.0.0.61 of the firmware. Current dsl settings are:

config dsl 'dsl'
        option xfer_mode 'ptm'
        option line_mode 'vdsl'
        option annex 'b'
        option tone 'bv'
        option ds_snr_offset '0'
        option firmware '/lib/firmware/dsl_firmware_10.0.0.61.bin'

Any help would be much appreciated.

Thanks!
Andrew

2

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)

3

Thanks! Those are the sorts of settings I was looking for.