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

[Jaime T]

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.

>> 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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