National and International Bits

Hi all, I have been studying Documentations on E1 and T1 for quite a long time but im not been able to understand the National and International Bits (ABCD bits) in E1. so please can some one help me with that. or if someone has a detail document on SuperFraming and ESF then i would be much obliged if he send me it on my email. Regards Asad Kamal

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