23 Replies Latest reply on Apr 13, 2012 3:59 PM by marcus

    Drop Calls over E1/T1 with Adtran ESU 120e . . . .

    martechmedicalmmw New Member

      To anyone happens with Adran ESU 120e drop calls ...

      Users are into a call and after i don't know 2, 5, 8, 12, 23  min suddenly the call hangs ..   What can be .. ??

       

      ESU 120e missconfiguration, differente transmission protocols from the carriers .....

       

       

      Anyone ....  thks all ...

        • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
          marcus Employee

          Thank you for your question. Has the ESU 120e been working fine previously? If so, then unless there was a config change on the ESU 120e or by the provider it’s not likely to a misconfiguration. What sort of voice traffic are you using? Is there a FXS module in the 120 or is the E1 passed out the DSX port to another device?

           

          The first place you’ll want to check is the E1. On the front plate of the 120 you should be able to select Status. Take a look at the NI PERF RPTS and record the values you see here and reply to this message with them. Do the same thing for NI ERRORS. These values are the errors on the E1. Errors on the E1 can cause calls to drop sporadically. 

            • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
              martechmedicalmmw New Member

              Hello ....

              The only physicall change we made was this. We connect this ADTRAN 1200209LI 75Ohm /120ohm adapter on the DB15.

              From there it goes to a E1/T1 card into a NEC PBX.

               

              Before there were 4 pins/cables connected to the DB15 (without somekind of connector)

              Back of ESU 120e.jpg

               

              Values from NI PERF RPTS are

              15 min / 24 hr

              %AS = 100.0 /100.0

              %EF = 100.0 / 99.9

              ES = 0 / 68

              BES = 0 / 0

              SES = 0 / 0

              DM  = 0 / 0

              UAS = 0 / 0

               

              Values from NI ERRORS are

              CRC = n/a

              LCV = blank/empty

              FER = blank/empty

               

              Thks in advance ..

                • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                  marcus Employee

                  Thanks for the photo, it gives me a good idea of how things are connected.  The adapter is going into the 0.2 drop port which is connecting to your PBX.  Under Status, go to Port Status and look at Port 0.2.  This should show CRC, BPV, SLIP and FER errors.  Let me know if any asterisks are displaying here.  When you check in the PBX, does it give you any indication of why the call dropped?

                    • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                      martechmedicalmmw New Member

                      Hello .... under Status / Port Status / Port : 0.2 Drop PT / Drop Errors (all four are blank, no asterisks)

                      CRC

                      BPV

                      SLIP

                      FER

                       

                      hmmmm ... because on the drop calls there's not an standard time when they drop, i mean; it could be at 2 min ant the call drop

                      or even a user could be on a call 1hr :45min and no drop ...

                       

                      monitoring the PBX remotely we got this results .. 

                       

                      Communication Error recovered between Main Site and

                      Remote Site

                      (Remote Site = 01)

                      Data = (01 FF FF FF FF FF FF FF)

                       

                      DTI line failure.

                      Power Failure Kind : AIS error

                      Data = (F3 FF FF FF FF FF FF FF)

                       

                      Kind regards ...

                        • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                          marcus Employee

                          Thanks for the information.  The AIS alarm is interesting, that's normally a physical level alarm that indicates the T1 is down.  The ESU will not generate an AIS alarm, it would have to be passed through the ESU from the outside T1, but we didn't see any errors on that T1 that would indicate an alarm.  Can you bypass the ESU and plug the T1 straight into the PBX?  I can't tell from the photo is there is a data connection as well as voice, but this would be the best way to verify if the problem is on the T1 or the Adtran.

                            • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                              martechmedicalmmw New Member

                              ESU120e.jpg

                              Let me share how its connected.

                              We have at RX / TX connectors connected a PairGain equipment for the E1/T1 circuit.

                              We have at Drop Port 0.2 the E1 BNC to DB-15 Adapter both on open earthed to the sides and this goes to the E1/T1 card on the NEC PBX

                              We have under those two, two cables going to a Cisco Router.

                               

                              Im lost when you told me to bypass the ESU and plug the T1 straight into the PBX ? 

                              I can take a photo on how its the E1/T1 card into the PBX .... if that helps ...

                               

                              Thks in advance.

                                • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                  marcus Employee

                                  Thanks  for the photo.  Removing the ESU and hooking straight to the PBX would be a short term test, for that time the data connection would be down.  The AIS alarm shown is not something that would come from the ESU, so with the ESU eliminated from the connection we're trying to determine if the problem persists or not.  Based on the photo, you have coax for the E1 going into the ESU and going out from the ESU to the PBX, so it should be possible to connect the E1 directly to the pbx.  If the problem persists then we've eliminated the ESU as the source of the problem. 

                                   

                                  If the problem goes away without the ESU in the connection or if you have additional questions on this, please feel free to email us at support@adtran.com

                      • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                        marcus Employee

                        Since there were no further questions we flagged this post as “assumed answered”.  Please feel free to mark any Correct or Helpful answers that assisted you.  If you still need assistance please let us know and we would be more than happy to continue working with you.

                          • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                            martechmedicalmmw New Member

                            Hi ...just yesterday we got both ISP doing complete test to the E1 / T1 circuit     .....   we got this answer from AT&T

                             

                            Both ends have been stressed tested, with clean test results.  I would of suggest have your  vendor prioritize the voice over data into your router, if calls are a priority.

                             

                            Thanks

                            AT&T Associate Tech Support Network Analyst

                             

                             

                            ... Today will arrive NEC tech to do test beetween PBX and MUX ...    i will keep you posted . !!

                             

                             

                            Meanwhile calls still drop ... 

                             

                             

                             

                             

                             

                             

                              • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                marcus Employee

                                It sounds like ATT is assuming the voice traffic is VOIP.  The ESU is MUXing out the channels from the T1 for the data and the voice so there is no priority to set on the ESU.  I look forward to seeing what the tech finds on the PBX side.  Hopefully we can verify if it's seeing AIS alarms.

                                  • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                    martechmedicalmmw New Member

                                    NEC tech change the E1 / T1 card into PBX .... We clear the alarm history into ESU ....    and start from there,

                                    we invite user to make calls and if any drop, they will let us know so ASAP.

                                     

                                    ALL GOING SMOOTH AND PERFECT ....  and suddenly ...  CHAOSS

                                     

                                    Calls drop, over and over again ...

                                     

                                    Into ESU at  Status / View History  we got this results

                                    1:26pm - 04/03 - 0.2 Remote Alarm

                                    1:26pm - 04/03 - 0.2 Remote Alarm Clr

                                    1:30pm - 04/03 - 0.2 Remote Alarm

                                    1:26pm - 04/03 - 0.2 Remote Alarm Clr

                                    1:30pm - 04/03 - NI Frame Slip

                                    1:30pm - 04/03 - NI Frame Slip Clr

                                    1:40pm - 04/03 - 0.2 TS16MF Loss Clr

                                    2:11pm - 04/03 - NI Frame Slip

                                    2:11pm - 04/03 - NI Frame Slip Clr

                                    2:11pm - 04/03 - 0.2 Remote Alarm

                                    2:11pm - 04/03 - 0.2 Remote Alarm Clr

                                    2:18pm - 04/03 - 0.2 Remote Alarm

                                    2:18pm - 04/03 - 0.2 Remote Alarm Clr

                                    2:18pm - 04/03 - NI Frame Slip

                                    2:18pm - 04/03 - NI Frame Slip Clr

                                    2:43pm - 04/03 - 0.2 Remote Alarm

                                    2:43pm - 04/03 - 0.2 Remote Alarm Clr

                                    2:43pm - 04/03 - NI Frame Slip

                                    2:43pm - 04/03 - NI Frame Slip Clr

                                    3:07pm - 04/03 - NI Frame Slip

                                     

                                    Toughts ...

                                     


                                      • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                        marcus Employee

                                        A remote alarm on the 0.2 suggests there was an alarm on the line going to the PBX.  Did the tech see any errors on the PBX side?  When it was going smoothly, were calls going through with no problem?

                                         

                                        If you have no bypassed the ESU yet for testing purposes, I'll recommend it again.  Based on the photo both sides of the connection use coax cables and since the ESU will just be muxing out certain channels for the PBX, the PBX should be able to make calls on the E1 when it's plugged in directly.

                                          • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                            martechmedicalmmw New Member

                                            NEC Tech guys get and his program, this report ...

                                             

                                             

                                            (Remote Site = 01)

                                            Data = (01 FF FF FF FF FF FF FF)

                                             

                                            DTI line failure.

                                            Power Failure Kind : AIS error

                                            Data = (F3 FF FF FF FF FF FF FF)

                                             

                                            Calls were made from around hour and half and not problems at all. Suddenly drops calls.

                                             

                                            I talk with NEC tech guy regarding doing that. Bypass ESU and he don't recommend it.  He explain to me about signaling differences beetwen US and MX.

                                            and thats why he doesn't recommend it.

                                             

                                            What about this errors ....

                                            0.2 TS16MF Loss Clr  &   NI Frame Slip   mean something important for this kind of problems .. ???

                                             

                                            BTW and going crazy right now .....

                                            Do you think  if i change the 2 COAX patch cord going from PBX into ESU, could make any significant change ....I mean the actual ones are very ... thin .....

                                              • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                                marcus Employee

                                                It could not hurt to replace the coax cables, but I would not expect cables to lead to an AIS error.   But it could relate to a power failure and the AIS looks like it's coming from the PBX.

                                                 

                                                The ESU muxes out E1s, so the signaling it likely to be the same on both sides.    You should be able to look under Config in the ESU and check the Network (NI) and Port (0.2 Drop) and see if the  NFAS word, CAS/TS16, and CRC-4 are all set the same.  If they are the same for both ports, then the E1 can connect to the PBX.

                                                 

                                                Take a look at the NI Perf Reports and NI Errors the next time the problem comes up, and the   Port Status 0.2 as well. 

                                                  • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                                    martechmedicalmmw New Member

                                                    We change the 2 COAX patch cords from the E1 BNC to DB15 Adapter to E1 card into PBX..

                                                     

                                                    Also we change into Config / Network (NI) / Interface from 120 Ohm bal to 75 Ohm Bal.

                                                     

                                                    But i got a question ... regarding E1 BNC to DB-15 Adapter ....

                                                     

                                                    Right now both dip switches are down ....  so we match that with the change made below.

                                                     

                                                    Do this change could mean anything for the problem we have ....??

                                                    • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                                      martechmedicalmmw New Member

                                                      Just staring watching at the computer room the ESU, suddenly i got alarms into CSU and DSU / DROP

                                                      Into Status / Port Status / Drop Errors

                                                      I got asterisk into BPV / SLIP / FER the one named CRC its blank.

                                                        • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                                          marcus Employee

                                                          What alarms do you see in the alarm history? And on the Network side do you see errors under NI Perf Rpts?  I would normally expect a hardware issue with the ESU to show persistent errors or alarms, not for it to come and go.  The drop port was showing Bipolar Violations, clock slips, and framing errors.  So if we had alarms on both sides of the ESU, we want to see where we were receiving an alarm and where we were transmitting an alarm.

                                                           

                                                          I'm not sure about the dip switches, are they on the adapter?  The ESU 120 has no dip switches, so I'm not sure what a change in the switches would represent. 

                                                            • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                                              martechmedicalmmw New Member

                                                              The dip switches are into the adapter, on both sides.

                                                               

                                                              At the alarm history we got

                                                              - 0.2 Remote Alarm

                                                              - 0.2 Remote Alarm Clr

                                                              - NI Frame Slip

                                                              - NI Frame Slip Clr

                                                               

                                                              Under NI Perf Rpts no errors at all.

                                                               

                                                               

                                                              Could be all this behavior at hardware failure at the ESU ?

                                                                • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                                                  marcus Employee

                                                                  So, what we're seeing at the time the trouble comes up is an alarm from the PBX.  Based on the information from the PBX vendor, there is an AIS alarm at that time. It could be a hardware issue with the ESU.  It could also be a hardware issue with the PBX.  The best way to test that will still be to plug the E1 straight into the PBX for testing purposes and see if the the problem persists or goes away.

                                                                    • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                                                      martechmedicalmmw New Member

                                                                      There's no active alarms but got a question the

                                                                       

                                                                      Remote Alarm & Frame Slip showed into the history of the ESU  ... what means ?

                                                                        • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                                                          marcus Employee

                                                                          Remote alarms are an indication that the device on the other side of the T1 was sending an alarm to the ESU.  So a remote alarm on the Drop Port 0.2 would tell us the PBX was sending the ESU an alarm.  The PBX is showing 'Power Failure Kind : AIS error'.  AIS stands for Alarm Indication Signal but I'm not sure how that connects to the Power Failure the PBX mentions.  The frame slip and clear seems to be a reaction to the alarm being received.

                                                                            • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                                                              martechmedicalmmw New Member

                                                                              BTW ....

                                                                               

                                                                              The other ESU where we're connecting its a TSU 120, in wich one we have the following.  Could be somekind of wron parameters beetwen both ESU's ?

                                                                               

                                                                              Under config / Network NI

                                                                              format ESF

                                                                              code B8Zs

                                                                                yel alarm enabled

                                                                                xmit prm off

                                                                                timing mode network ni

                                                                                set lbo 0.0

                                                                                rem lpbk det: Reject FT1
                                                                                Bit Stuffing: disable

                                                                                TR-08 options

                                                                                 under TR-08 options

                                                                                 alarm report: send alarms

                                                                                  alarm format: orb-16

                                                                                  BPV Threshold: 10-4

                                                                               

                                                                              Under config / Port Config / NX56/64

                                                                              ds0 Rate: 64 KBPS

                                                                              TX CLK CNTRL: Normal

                                                                              Data: Normal

                                                                              CTS: Normal

                                                                              DCD: Normal

                                                                              DSR: Normal

                                                                                "0" INHIB: Off

                                                                                INBAND MODE: off

                                                                                TX CLK SOURCE: Internal

                                                                               

                                                                              Under config / Port Config / DSX-1

                                                                              Format: ESF

                                                                              CODE: B8ZS

                                                                              REMOTE ALARM: YELLOw

                                                                                LINE LENGTH: 1-133 ft

                                                                                INBAND LPBACK: ACCEPT

                                                                                ROB BIT SIGNL: ON: ALL DS0s

                                                                               

                                                                              The maps that are using ..

                                                                              IDLE DS0's = 0

                                                                              IST DS0's = 0

                                                                              0.2 DSX-1 = 8

                                                                              0.1 NX56/64 = 16

                                                                               

                                                                              Message was edited by: martechmedicalmmw On ESU 120e the Map A its as follow IDEL TS0s = 6 TST TS0s = 0 0.2 Drop PT = 8 0,1 NX56/64 = 16

                                                                                • Re: Drop Calls over E1/T1 with Adtran ESU 120e . . . .
                                                                                  marcus Employee

                                                                                  Is the TSU on the opposite side of a point to point connection from the ESU?  If so it's not likely to be part of the problem, it just means somewhere in the connection they are converting from the T1 to the E1 at your side.  What we've been seeing is an alarm coming to us from the PBX.  The TSU should have nothing to do with that.  The settings provided look normal for a point to point connection.  You have 16 DS0s for data and 8 going to the PBX for voice.