LG GDK-20W User Manual

GDK-20W DIGITAL WIRELESS KEY TELEPHONE SYSTEM     
 

 

 

 

 

 
Power must be turned off prior to insertion or removal of the PCB. 
The system PCBs contain digital circuitry which can be damaged by exposure to excessive static electricity. When 
handling PCBs, a grounded wrist strap should be used to protect the boards from static discharges. Also, use common 
sense when handling the PCBs. For example, do not place a PCB in locations where heavy objects might fall on the PCB 
and damage components. 
 
To insert a PCB, hold the PCB and, with component side facing right, insert the card into the MBU’s din connector firmly 
and tighten. To remove a PCB, reverse the procedure. Installation method of PCB is shown in Figure 3.4.1. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
There are 6 slots in the GDK-20W system for extend or modify the system configuration. But, there are some restrictions 
when optional board installation. Note that the system can not operate properly with wrong installation. The SLOT1 of the 
MBU is reserved only for DVIB

/DVIBE

, the SLOT2 & SLOT3 is reserved for 

LCOBs or STIB2/STIB

, the SLOT4 are 

reserved only for PMU and the SLOT5 and SLOT6 is reserved for WTIB and MFB, respectively. 

To summarize, see the following table 3.4.1. 

 

Slot No. 

Cards 

Remark 

 SLOT1  

 DVIB, 

DVIBE

 

  Fixed slot for DVIB 

 SLOT2 
 SLOT3 

 LCOB2, LCOB, 

LCOBE, 

LCOBA, LCOB4

,STIB2, STIB 

  Option board for LCO, ISDN 

 SLOT4 

  PMU 

  Fixed slot for PMU(Basic) 

 SLOT5 

 WTIB 

 Fixed slot for WTIB 

 SLOT6 

 MFB 

 Fixed slot for MFB 

 
When the system power on, the default slot assignment is automatically redefined according to board installation status. 

 
The MBU is installed in the KSU default. It comprised of main processor, four(4) Digital Terminal interface circuits, two(2)