User's Manual

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5.1.4 MDBU insertion
MDBU is designed to let a MDBU be inserted into any slot.
BIU can be equipped with a total of four MDBUs. If only one MDBU is inserted into a
slot with the other slots reserved, you need to insert BLANK cards into the other slots.
If you do not terminate input and output ports of MCDU, which combines TX signals and
divides RX signals, it will cause loss and generation of spurious signals at the other party's band.
Given this, make sure to insert MDBU BLANK into slots of MDBU.
When MDBU is inserted into BIU, LED at the front panel will show the following information:
MONITOR SMA port seen at the front panel of MDBU enables you to check current
LED Description
ON
Power is not supplied.
Power is supplied.
ALM
Normal Operation
Abnormal Operation