[OpenWrt-Devel] Frequent adsl disconnections with BTHOMEHUBV2B (lantiq xway danube)

[Sebastian Moeller]

Hi Jaime,

On Nov 21, 2014, at 12:49 , Jaime T <enopatch at gmail.com> wrote:

> On 20 November 2014 20:49, Sebastian Moeller <moeller0 at gmx.de> wrote:
>> Hi Jaime,
>> not an expert on adel modem errors, let alone lantiq, here is my attempt at helping out:
> 
> Hi Sebastien. Thank you for trying to help me - I appreciate it.
> 
>>        Maybe https://forum.openwrt.org/viewtopic.php?pid=222065 works for you? Increasing the SNR ,arhin should make your link more resilient...
> 
> Ok, I've just tried that, but I think that it's only returning an error code.
> 
> locs 0 -20
> nReturn=-11
> 
> The corresponding "getter" command ("locg") shows the following:
> 
> locg
> Long Form: LineOptionsConfigGet
> Short Form: locg
> 
> Input Parameter
> - DSL_LineOptionsSelector_t nConfigSelector (dec)
>   DSL_OPT_NOISE_MARGIN_DELTA_DS = 0
>   DSL_ERASURE_DECODING_TYPE_DS = 1
>   DSL_TRUST_ME_BIT = 2
>   DSL_INBAND_SPECTRAL_SHAPING_US = 3
> 
> Output Parameter
> - DSL_Error_t nReturn
> - DSL_int32_t nConfigValue (dec)
> 
> The other option selectors appear to work ok:
> 
> locs 1 0
> nReturn=0
> 
> locs 2 0
> nReturn=0
> 
> locs 3 0
> nReturn=0
> 
> I've also just found (in
> http://svn.dd-wrt.com/browser/src/router/dsl_cpe_control/include/drv_dsl_cpe_api.h)
> the following:
> 
> /**
> 2782   Configuration of a target noise margin delta at the CPE, which
> is added to
> 2783   the target noise margin value configured atand received from the CO.
> 2784   The resulting value is then taken as target noise margin, e.g. for bit
> 2785   loading.
> 2786   The target noise margin delta ranges from -5 dB to +5 dB with
> 0.1 dB steps.
> 2787   \note API value -50 corresponds to -5 dB, 50 to 5 dB.
> 2788   \note This configuration option is only valid for Vinax. */
> 2789   DSL_OPT_NOISE_MARGIN_DELTA_DS = 0,
> 2790   /**
> 
> so I guess this means that this option will never work. :-( All the
> other lantiq dsl commands which have the characters "snr" in them
> (such as
> g997dsnrg, g997sang and g997sansg) are all "getter" commands which
> return large blocks of data.

	Too bad, would have been nice. Now I think that some of AVM’s fritzbox routers are based on non-vinax lantiq SOCs and support setting SNR margin, but the tool might be proprietary. But since I have o lantiq system available I can not be of any help… sorry.

Best Regards
	Sebastian

> 
>>> If
>>> not, I'm going to have to buy a dsl modem with a broadcom chipset and
>>> use that instead…
>> 
>>        If you could buy such a modem you could test whether it really improves things? If there is a massive source of RF ingress on your link maybe another odem might not help much?
> 
> I'm still confused by the fact that when I put the "Sky-supplied"
> SR102 router on the line, I don't get these disconnections. I think my
> only option now is to try a different modem...
> 
> Thank you for all your help! With kind regards, Jaime
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