root@openwrt:~# /sbin/vdsl_cpe_control --console
DSL_CPE#>help
acog, AutobootConfigOptionGet
acos, AutobootConfigOptionSet
acs, AutobootControlSet
alf, AutobootLoadFirmware
asecg, AutobootScriptExecuteConfigGet
asecs, AutobootScriptExecuteConfigSet
asg, AutobootStatusGet
aufg, AutobootUsedFirmwareGet
alig, AuxLineInventoryGet
bbsg, BandBorderStatusGet
bpstg, BandPlanSTatusGet
bpsg, BandPlanSupportGet
dbgmlg, DBG_ModuleLevelGet
dbgmls, DBG_ModuleLevelSet
dmms, DeviceMessageModifySend
dms, DeviceMessageSend
esmcg, EventStatusMaskConfigGet
esmcs, EventStatusMaskConfigSet
fddg, FilterDetectionDataGet
fpsg, FramingParameterStatusGet
g997amdpfcg, G997_AlarmMaskDataPathFailuresConfigGet
g997amdpfcs, G997_AlarmMaskDataPathFailuresConfigSet
g997amlfcg, G997_AlarmMaskLineFailuresConfigGet
g997amlfcs, G997_AlarmMaskLineFailuresConfigSet
g997bang, G997_BitAllocationNscGet
g997bansg, G997_BitAllocationNscShortGet
g997cdrtcg, G997_ChannelDataRateThresholdConfigGet
g997cdrtcs, G997_ChannelDataRateThresholdConfigSet
g997csg, G997_ChannelStatusGet
g997dpfsg, G997_DataPathFailuresStatusGet
g997dfr, G997_DeltFreeResources
g997dhling, G997_DeltHLINGet
g997dhlinsg, G997_DeltHLINScaleGet
g997dhlogg, G997_DeltHLOGGet
g997dqlng, G997_DeltQLNGet
g997dsnrg, G997_DeltSNRGet
g997fpsg, G997_FramingParameterStatusGet
g997gang, G997_GainAllocationNscGet
g997gansg, G997_GainAllocationNscShortGet
g997lstg, G997_LastStateTransmittedGet
g997lacg, G997_LineActivateConfigGet
g997lacs, G997_LineActivateConfigSet
g997lfsg, G997_LineFailureStatusGet
g997lisg, G997_LineInitStatusGet
g997lig, G997_LineInventoryGet
g997listrg, G997_LineInventorySTRingGet
g997lis, G997_LineInventorySet
g997lsg, G997_LineStatusGet
g997lspbg, G997_LineStatusPerBandGet
g997ltsg, G997_LineTransmissionStatusGet
g997pmsft, G997_PowerManagementStateForcedTrigger
g997pmsg, G997_PowerManagementStatusGet
g997racg, G997_RateAdaptationConfigGet
g997racs, G997_RateAdaptationConfigSet
g997smr, G997_SnmpMessageReceive
g997sms, G997_SnmpMessageSend
g997sang, G997_SnrAllocationNscGet
g997sansg, G997_SnrAllocationNscShortGet
g997xtusecg, G997_XTUSystemEnablingConfigGet
g997xtusecs, G997_XTUSystemEnablingConfigSet
g997xtusesg, G997_XTUSystemEnablingStatusGet
help, Help
hsdg, HybridSelectionDataGet
ics, InstanceControlSet
isg, InstanceStatusGet
lecg, LastExceptionCodesGet
lfcg, LineFeatureConfigGet
lfcs, LineFeatureConfigSet
lfsg, LineFeatureStatusGet
locg, LineOptionsConfigGet
locs, LineOptionsConfigSet
lsg, LineStateGet
llsg, LoopLengthStatusGet
llcg, LowLevelConfigurationGet
llcs, LowLevelConfigurationSet
mlsg, MiscLineStatusGet
mfcg, MultimodeFsmConfigGet
mfcs, MultimodeFsmConfigSet
mfsg, MultimodeFsmStatusGet
nsecg, NotificationScriptExecuteConfigGet
nsecs, NotificationScriptExecuteConfigSet
pm15meet, PM_15MinElapsedExtTrigger
pmbms, PM_BurninModeSet
pmcc15mg, PM_ChannelCounters15MinGet
pmcc1dg, PM_ChannelCounters1DayGet
pmccsg, PM_ChannelCountersShowtimeGet
pmcctg, PM_ChannelCountersTotalGet
pmchs15mg, PM_ChannelHistoryStats15MinGet
pmchs1dg, PM_ChannelHistoryStats1DayGet
pmct15mg, PM_ChannelThresholds15MinGet
pmct15ms, PM_ChannelThresholds15MinSet
pmct1dg, PM_ChannelThresholds1DayGet
pmct1ds, PM_ChannelThresholds1DaySet
pmcg, PM_ConfigGet
pmcs, PM_ConfigSet
pmdpc15mg, PM_DataPathCounters15MinGet
pmdpc1dg, PM_DataPathCounters1DayGet
pmdpcsg, PM_DataPathCountersShowtimeGet
pmdpctg, PM_DataPathCountersTotalGet
pmdpfc15mg, PM_DataPathFailureCounters15MinGet
pmdpfc1dg, PM_DataPathFailureCounters1DayGet
pmdpfcsg, PM_DataPathFailureCountersShowtimeGet
pmdpfctg, PM_DataPathFailureCountersTotalGet
pmdpfhs15mg, PM_DataPathFailureHistoryStats15MinGet
pmdpfhs1dg, PM_DataPathFailureHistoryStats1DayGet
pmdphs15mg, PM_DataPathHistoryStats15MinGet
pmdphs1dg, PM_DataPathHistoryStats1DayGet
pmdpt15mg, PM_DataPathThresholds15MinGet
pmdpt15ms, PM_DataPathThresholds15MinSet
pmdpt1dg, PM_DataPathThresholds1DayGet
pmdpt1ds, PM_DataPathThresholds1DaySet
pmetr, PM_ElapsedTimeReset
pmlesc15mg, PM_LineEventShowtimeCounters15MinGet
pmlesc1dg, PM_LineEventShowtimeCounters1DayGet
pmlescsg, PM_LineEventShowtimeCountersShowtimeGet
pmlesctg, PM_LineEventShowtimeCountersTotalGet
pmleshs15mg, PM_LineEventShowtimeHistoryStats15MinGet
pmleshs1dg, PM_LineEventShowtimeHistoryStats1DayGet
pmlfc15mg, PM_LineFailureCounters15MinGet
pmlfc1dg, PM_LineFailureCounters1DayGet
pmlfcsg, PM_LineFailureCountersShowtimeGet
pmlfctg, PM_LineFailureCountersTotalGet
pmlfhs15mg, PM_LineFailureHistoryStats15MinGet
pmlfhs1dg, PM_LineFailureHistoryStats1DayGet
pmlic15mg, PM_LineInitCounters15MinGet
pmlic1dg, PM_LineInitCounters1DayGet
pmlicsg, PM_LineInitCountersShowtimeGet
pmlictg, PM_LineInitCountersTotalGet
pmlihs15mg, PM_LineInitHistoryStats15MinGet
pmlihs1dg, PM_LineInitHistoryStats1DayGet
pmlit15mg, PM_LineInitThresholds15MinGet
pmlit15ms, PM_LineInitThresholds15MinSet
pmlit1dg, PM_LineInitThresholds1DayGet
pmlit1ds, PM_LineInitThresholds1DaySet
pmlsc15mg, PM_LineSecCounters15MinGet
pmlsc1dg, PM_LineSecCounters1DayGet
pmlscsg, PM_LineSecCountersShowtimeGet
pmlsctg, PM_LineSecCountersTotalGet
pmlshs15mg, PM_LineSecHistoryStats15MinGet
pmlshs1dg, PM_LineSecHistoryStats1DayGet
pmlst15mg, PM_LineSecThresholds15MinGet
pmlst15ms, PM_LineSecThresholds15MinSet
pmlst1dg, PM_LineSecThresholds1DayGet
pmlst1ds, PM_LineSecThresholds1DaySet
pmrtc15mg, PM_ReTxCounters15MinGet
pmrtc1dg, PM_ReTxCounters1DayGet
pmrtcsg, PM_ReTxCountersShowtimeGet
pmrtctg, PM_ReTxCountersTotalGet
pmrths15mg, PM_ReTxHistoryStats15MinGet
pmrths1dg, PM_ReTxHistoryStats1DayGet
pmrtt15mg, PM_ReTxThresholds15MinGet
pmrtt15ms, PM_ReTxThresholds15MinSet
pmrtt1dg, PM_ReTxThresholds1DayGet
pmrtt1ds, PM_ReTxThresholds1DaySet
pmr, PM_Reset
pmsmg, PM_SyncModeGet
pmsms, PM_SyncModeSet
ptsg, PilotTonesStatusGet
quit, Quit
rccg, RebootCriteriaConfigGet
rccs, RebootCriteriaConfigSet
rusg, ResourceUsageStatisticsGet
se, ScriptExecute
sicg, SystemInterfaceConfigGet
sics, SystemInterfaceConfigSet
sisg, SystemInterfaceStatusGet
tmcs, TestModeControlSet
tmsg, TestModeStatusGet
vig, VersionInformationGet
working through one by one, the snr commands above with g997 look the most promising