RRU - Ring Mode Configuration

[techfolkcmr]

Hello all,

We have Huawei DBS 3900 (UMTS only) with RRU (3908-not sure about model) in many sites which works in STAR configuration with BBU. Due to external factors often break will happen in any one of 3 CPRI Cables. So searched for solution and came to know about forming RING topology. Could someone pls explain how to connect RRU in RING topology with BBU and necessary BBU configuration. RRU having two CPRI ports CPRI_E(Eastward) & CPRI_W(Westward). Thanks in advance.