Adtran Tsu Ace T1 FT1 DSU/CSU NX56/NX64 1.536 MBps D4-SF/ESF

hi everyone we are going to discuss channel service unit and data service unit today so as we know if we have two networks which are really far away from each other for example in this case we have this network and this network they are at 14 000 kilometers far away from each other then we need a wide area network link and these wide area network uses services from telephone network cable network or that may be satellite systems so from this point to this point we actually purchase services from somewhere and these service providers actually can operate at different speeds or different clocking so for example in this case we are here in this local area network and this is the wide area network which is going to provide us the services but they operate at different speeds it means we need someone here to help us to to to deal with that clocking our this wide area network link may have di