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3.1.3.6 System interface unit (SIU)
This unit connect with HRDU, R CPU, R Optic and RPSU. SIU distributes power and signals to
each module. Each unit need to connected to the correct slot of the SIU.
Figure 13. SIU Outer Look
3.1.4 Bottom of HROU
3.1.4.1 Functions
The Bottom look of HROU depends on the combine unit(CU) with 3 options.
The CU option1 and 2 need to install a specified CU in the enclosure like the table below explains.
Thus, the CU option1 has one antenna port, the CU option2 has two antenna ports.
Finally, the CU option3 with 4 antenna ports is not necessary to install CU in the enclosure and needs to
apply the panel with 4-DIN Type on the bottom of HROU.
See table and drawing below for.