Mobile WiMAX/TD-LTE RRH-2WB Installation Manual/Ver.2.0© SAMSUNG Electronics Co., Ltd. 1-3RRH-2WB External InterfaceThe external interface of RRH-2WB is as follows:Figure 1.3 RRH-2WB External Interface[Bottom View]ATN_3 ATN_0ATN_1ATN_2-48 V IN Optic RET Frame GroundDebug