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New Contributor

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

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 ...

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

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. 

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New Contributor

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

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 ..

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

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?

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New Contributor

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

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 ...

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

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.

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New Contributor

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

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.

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

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

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

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.

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New Contributor

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

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 ... 

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