LG GDK-20W - Manual (Page 23)

GDK-20W DIGITAL WIRELESS KEY TELEPHONE SYSTEM
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Single Line Telephone interface circuits, six(6) card slots for optional boards, one(1) Wireless terminal interface circuit
and data communication circuit which transmits and receives to/from other cards. The MBU is equipped with one basic
card; a PMU for program memory, data memory, and etc. Refer to Figure 3.4.2.
Figure 3.4.2 MBU Installation
The MBU provides screw-down terminal blocks that is used to connect the peripheral instruments; Keyset, SLT, Base
station, and etc. Four(4) DKTUs are connected to MBU through terminal block, CN18, and two(2) SLTs are connected to
the SLT1 & SLT2 ports of terminal block, CN19. The connection between MBU and base station is performed through
the WTI1 port of terminal block, CN19. All of peripheral instruments are installed by using twisted one pair copper line.