1 Reply Latest reply on Feb 6, 2020 11:30 PM by jayh

    PRI will not stay up

    telnet_jonanderson New Member

      New AT&T IP flex PRI handoff to Adtran TA 908e 3rd GEN will not stay up. D channel is flapping and B channels go OOS and then back in.

       

      It's a partial PRI 10 B channels and D channel 24. I've reviewed configs with AT&T and we're both setup for NI2. Carrier reports a huge count of Code Violation errors on T1 cross over cable. We've swapped the cable and it remains in trouble.

       

      I've tried LBO commands -7.5, -15 and -22.5 but none seem to make a difference.

       

      Any ideas? I see this in the logs

      2020.02.06 15:04:47 ISDN.EP PRI  2  Call clearing: TIMER_EXPIRY : Loc=U

       

      2020.02.06 15:04:47 ISDN.EP PRI  2  D channel is DOWN

      2020.02.06 15:04:47 TM.T01 0 Taking 10 b-channels out-of-service

       

      2020.02.06 15:04:47 TM.T01 01 tachgClearing processed by IsdnTmState base

      2020.02.06 15:04:48 INTERFACE_STATUS.pri 2 changed state to down

      2020.02.06 15:04:48 ISDN.EP PRI  2  D channel is UP

      2020.02.06 15:04:49 INTERFACE_STATUS.pri 2 changed state to up

      2020.02.06 15:04:50 TM.T01 0 Adding 10 b-channels in-service

       

      2020.02.06 15:05:27 ISDN.EP PRI  2  D channel is DOWN

      2020.02.06 15:05:27 TM.T01 0 Taking 10 b-channels out-of-service

       

      2020.02.06 15:05:27 INTERFACE_STATUS.pri 2 changed state to down

      2020.02.06 15:05:27 ISDN.EP PRI  2  D channel is UP

      2020.02.06 15:05:28 INTERFACE_STATUS.pri 2 changed state to up

      2020.02.06 15:05:29 TM.T01 0 Adding 10 b-channels in-service

       

      2020.02.06 15:06:06 ISDN.EP PRI  2  D channel is DOWN

      2020.02.06 15:06:06 TM.T01 0 Taking 10 b-channels out-of-service

       

      2020.02.06 15:06:06 INTERFACE_STATUS.pri 2 changed state to down

      2020.02.06 15:06:06 ISDN.EP PRI  2  D channel is UP

      2020.02.06 15:06:07 INTERFACE_STATUS.pri 2 changed state to up

      2020.02.06 15:06:07 TM.T01 0 Adding 10 b-channels in-service

       

      2020.02.06 15:07:33 ISDN.EP PRI  2  D channel is DOWN

      2020.02.06 15:07:33 TM.T01 0 Taking 10 b-channels out-of-service

       

      2020.02.06 15:07:33 ISDN.EP PRI  2  D channel is UP

      2020.02.06 15:07:34 TM.T01 0 Adding 10 b-channels in-service

       

      2020.02.06 15:09:00 ISDN.EP PRI  2  D channel is DOWN

      2020.02.06 15:09:00 TM.T01 0 Taking 10 b-channels out-of-service

       

      2020.02.06 15:09:00 INTERFACE_STATUS.pri 2 changed state to down

      2020.02.06 15:09:01 ISDN.EP PRI  2  D channel is UP

      2020.02.06 15:09:01 INTERFACE_STATUS.pri 2 changed state to up

      2020.02.06 15:09:03 TM.T01 0 Adding 10 b-channels in-service

        • Re: PRI will not stay up
          jayh Hall_of_Fame

          Sounds like a T1 coding/framing issue. Make sure that your T1 TDM-group configurations have "speed 64" after the timeslots.

           

          "Show Interfaces" will tell you if the Adtran is configured for ESF/B8ZS. It should be.

           

          Also make sure that the TA908e is set to take clocking from the carrier. "Show system" should have the carrier's T1 as the active and primary configured timing source. It's configured with the "timing-source" command.

           

          Check to be sure framing is ESF and linecode is B8ZS throughout the T1 configuration. Look at the smartjack (which is probably made by Adtran). There are indicator lights that are different colors for B8ZS vs. AMI. It should be optioned B8ZS. If not, ask the carrier to fix it.

           

          Can the carrier run clean to the smartjack?