cellular backhaul unit (FTTCell) (CBU)
The Cellular Backhaul Unit (CBU) forms the Optical Network Unit(ONU) of Fiber to the Cell( FTTCell).
CBU units connect the base stations or the NodeB to Gigabit- PON( GPON) and the Optical Distribution Network( ODN), so that direct access of the cellular mobile networks to the passive optical network is achieved. The Cellular Backhaul Unit (CBU) supports collocation of2G with 3G, as well as ATM and Time Division Multiplexing(TDM).