5 Replies Latest reply on Jul 18, 2014 9:05 AM by havonasun

    TA850 TDM Firmware

    havonasun New Member

      Just acquired two 850's for a back-to-back T1.  One RCU already has TDM firmware on it, but the other has ATM C.01.18.  Even though I factory reset it via dip switch, when the TFTP transfer completes (A04.04.71), there is a 'CHKSUM Failure'.  I tried redownloading.  Does the RCU need to be downgraded, or replaced?  Is there a migration path?  Both RCU's are 3rd gen. 

        • Re: TA850 TDM Firmware
          havonasun New Member

          The V35 led stays lit no matter what.  I was able to upgrade to C0290, and then to C040471, which finally made the V35 led turn off. 'C' is for ADPCM Gen1 RCU's.  I tried to flash A040471 at this point; no go.  So far, any attempt to put a Gen3 file on this 1200376L1 card results in a CHKSUM failure. 

           

          I was able to load A.03.22 Gen1 TDM; this is the first 'A' that worked.  Now it's stuck in a boot loop.

          • Re: TA850 TDM Firmware
            havonasun New Member

            I have replaced the RCU.  The PN is 1200376L1.  Is this not a 3rd Gen card?  Once booted, I see A.03.57.  Attempt to load A04.04.71 (3A040471).  CHKSUM Failure!  Attempt to load A04.04.71 (1A040471).  Success!   Same story on unit two's RCU.

             

            Can anyone educate me as to why a 3rd gen card would only accept 1st gen firmware?