[OpenWrt-Devel] lantiq DSL drivers / firmware info

[Alexander Couzens]

On Thu, 23 Jul 2015 23:51:33 +0200
Martin Blumenstingl <martin.blumenstingl at googlemail.com> wrote:

> Hi Andre,
> 
> On Thu, Jul 23, 2015 at 11:32 PM, Andre Heider <a.heider at gmail.com> wrote:
> > The dsl line never syncs, and letting 'vdsl_cpe_control --c' just sit
> > there spits out repeatedly:
> > 'DSL_CPE: Wrong combination of DSL PHY Firmware and hybrid type used!
> > Please change one of it.'.
> At some point during my tests I got a second device (an Arcadyan
> VGV7510KW22 - which came as "Annex B" device from the factory). Using
> the very same config made this device sync fine.
> 
> > This sounds like an annex incompability? Was I wrong and there is a
> > hardware difference and I cannot use the non B model with annex b?
> Indeed, I have read multiple times that the DSL modem should support
> all annexes - but as our tests have shown: it doesn't (at least for
> ADSL). My guess is that the modem physically supports it but there's a
> bootstrap pin (to which a resistor is soldered... or not) which
> configures it to be Annex A *or* B only.
> The interesting part: VDSL is not affected by this (all ISPs in all
> countries seem to use VDSL over ISDN). I am using an Annex A device on
> a German VDSL line and this is working fine.
> 
> bottom line: it seems that the modems are bound to a specific annex
> for ADSL operation.
I've seen the same. With annex b device, same firmware, the modem syncs to adsl, with annex a not. vdsl is working unrelated to the annex (B on A and vice versa is working).
If someone would like to search for differences on the pcb, I can make photos of both pcbs.

best,
lynxis
-- 
Alexander Couzens

mail: lynxis at fe80.eu
jabber: lynxis at jabber.ccc.de
mobile: +4915123277221
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