Ericsson RBS 2106 Hardware Reference Manual page 178

Radio Configurations
** 1 x 10, 1 x 12, 1 x 14, 1 x 16 and 1 x 18 can be accomplished with a
partly-equipped expansion configuration.
*** 3 x 6 can be accomplished with a partly-equipped expansion configuration.
**** When using TG-synchronization, only one RBS 200/RBS 205 can act as
master. Therefore the 3 x 4 configuration, which contains three separate RBSs,
must be rebuilt to one single RBS; that is, all three sectors of the RBS 200
must be connected to the same TMCB.
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3 x 8 * 3 x 4 RBS
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M = Mandatory
* 3 x 6 can be accomplished with a partly-equipped expansion configuration.
1 x 8 can be accomplished with one RBS 200/RBS 205 and a partly-equipped
expansion configuration.
** When using TG-synchronization, only one RBS 200/RBS 205 can act as
master. Therefore the 3 x 4 configuration, which contains three separate RBSs,
must be rebuilt to one single RBS; that is, all three sectors of the RBS 200
must be connected to the same TMCB.
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EN/LZT 720 0318 Uen R1A