User's Manual

Confidential & Proprietary 26/87
3) Main Central Processor Unit (MCPU)
MCPU can inquire and control state of modules that are installed in BIU.
This unit can inquire and control state of four ODUs in total. Through communication, it also can
inquire and control ROU that is connected with lower parts.
In addition, the unit has RS-232C port for serial communication so that it can inquire and control
state of devices through PC. On the front panel, it has communication LED indicator to check
communication state with ROU. It also has ALM LED indicator to show whether a device gets
faulty.
For access to upper network, it has a port to insert Ethernet port and GSM modem in it.
Figure 4.5 – MCCU Outer Look
In the Main Central Processor Unit, a lithium battery is installed for RTC (Real Time Control)
function.
CAUTION
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE
DIPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS
[INSTRUCTION]
The equipment and accessories including inner lithium battery are to be disposed of safely after
the life span of them and national regulation must be observed. Do not attempt to replace the
lithium battery unless service personnel confirmation has first been obtained, to avoid any risk
of explosion.
4) Main Power Supply Unit (MPSU)