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NM-8B-U problem

Hello, have one problem.

We have NM-8B-U module. From time to time ports a this module burns out. I can't find reoson? Why? I think that problem with our SP isdn lines and module compatibility.

I found some interesting. Module uses LH1465AB/AAE ISDN dc Termination IC. After that found data sheet for LH1465. So at 1'st page written - ANSI U-DSL compatible. So.. as i understood its american standart. But I can't found official description of this module Compatibilities. Could you answer ... what standars this module suppors( american, europe...)?

Thanks in advanced.

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