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GDK-20W DIGITAL WIRELESS KEY TELEPHONE SYSTEM
25
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.