Like all other wireless base station equipment OEMs, Ericsson offers a baseband unit (BBU)/remote radio unit (RRU) BTS architecture in additional to traditional macrocell BTS cabinets.
1. RRU RF inter-connection 1.1 Definition: RRU inter-connection is the RF cable inter-connection. The 2 RRU in the same sector will be inter-connected from RX_in/out port by RX cables. 1.2 Scenario: If there is only 2 jumpers of 1 antenna system in the same coverage and the cell configuration is more than S4 or S6 TRX, the RRU or RFU inter-connection will be used.
1.3 Cable: The cable should be delivered to the site, if the RRU inter-connection is required.
1.4 RX_in/out port
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1.5 Inter-connection cable installation
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2. RRU CPRI cascading 2.1 Definition: RRU cascading is the CPRI cable or CPRI fiber connection. More than one RRU will be use the same SFP port of UBRI or BBP board. The cascading cable will be connected to SFP port. 2.2 Scenario: More than one RRU will be use the same SFP port of UBRI or BBP board.
