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Alexander Chemeris alexander.chemeris at gmail.comHi Jean-Samuel, On Tue, Jul 3, 2012 at 10:59 PM, Jean-Samuel Najnudel - BJT PARTNERS SARL <jsn at bjtpartners.com> wrote: > Hi Alexander, > > Thank you very much for your e-mail. > > 1/ They did not started the PCB manufacturing yet. They are still > waiting for my feedback on the questions I asked to Andrey. > > Actually, if we need to replace the SRAM and/or the flash to use > cheaper equivalent components, we may need to reroute the PCB. This is > why I ask them to wait for the feedback from Andrey before starting > the PCB production. They can start as soon as we let them know what we > do about the SRAM and the flash (with or without PCB files update). > > Anyway, I was not very worried about the delay. As discussed together > last time in Paris, before deploying the UmTRX on the field, we would > need OpenBTS to support handover. Even for tests, if I open the > network without handover, because of the terrain in Mayotte, there > will be so much call drops nobody in Mayotte will accept to use our > network anymore in the future. Really, handover is very important in > Mayotte. > > As I understand OpenBTS is under development but it is quite hard > work. It will probably not be ready before the end of this summer. > This is why I did not feel very worried about the PCB production > delay. We really need to get prototypes ASAP for many reasons - we have to start certification process, we still need to find enclosures, we have other pilots pending, etc. And every week of delay is painful for us. > Anyway, I will do my best to get the UmTRX prototypes ready as soon as > possible. I just need a feedback from Andrey because, if it does not > lower the UmTRX board performances, we should really try to find an > alternative solution to use cheaper SRAM and flash chips. This could > improve a lot the cost structure of the UmTRX. We should be fine with this chip: http://www.digikey.com/product-detail/en/IS61NLP51236-200TQLI/706-1103-ND/1557418 (with no PCB changes). > 2/ I did not contacted Lime yet but I will do this as soon as > possible. I will do my best to get the LMS chips on time. > > By the way, for both PCB assembly and LMS order, how many UmTRX board > would you like the fab makes ? We discussed together about 5 or 10 > units but we did not took the final decision yet. It can be any > reasonable number between 5 and 10. Please let me know the quantity > you would need. I will ask the fab and order the component quantities > we need. We have only 5 FPGAs left, so I think we should assembly 5 prototypes. I.e. we need 10 LMS chips. But we could safely order more PCBs, because we're pretty sure PCB won't change. > By the way, the meeting with the fab this morning was fine and they > are ready to start the production asap. Please, start PCB manufacturing ASAP. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru