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adtran 850 with E+M TO cards

adtran 850 with E+M TO cards

(OP)
I have a pair of 850's connnected by point to point T1 at our locations. I currently am running radio over one of the cards and it works great . On the 2nd card I"M trying to run data using 2 9600 baud modems.Adtran says this is fine. My problem is the modems work for awhile but are always trying to renegotiate for better speed and so the data keeps getting disrupted. All the level are spec and signal to noise is better than spec.Had AT+T out to check T1 and they say all is OK.
I have several other of these working this way and the only differance I see is the T1's on all of them have an identifier of DHZA******** and this circuit begins with HCFD*****. Mike

RE: adtran 850 with E+M TO cards

Hi Mike,

The portion of the circuit ID that has letters like, HCFD or DHZA, describe the basic channel and LEC or IC characteristics for specific uses or other purposes. In regards to your post, do you know what was ordered from the provider? You need to make sure the DS1 framing and line code of the 850 are configured to match those of the DS1 circuit on both ends. For example, if the 850 was set for SF/B8ZS and the DS1 circuit is SF/AMI, you will take errors because of BPVs, that can play havoc with digital or analog data on the individual channels, especially channel 24. So the DS1 circuit may be fine, but the equipment on both ends needs to be set correctly. Do you have any test equipment like a T-Berd or equivalent? Also your data levels need to be correct on the channel units that connect to the modems. Analog data levels are -13dBm0 from TLP.

Hope this helps!

....JIM....

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