LG Electronics LKD-8DS, GDK-20W installation manual Off

GDK-20W DIGITAL WIRELESS KEY TELEPHONE SYSTEM

Figure 3.4.3 RGU connector and protection switch setting

Following table shows the connector and switch on GDK-20W MBU.

	Switch		Description	Remark
ISSUE 1		Manufacturer
		setting
CN23			Pin 1&2 short: 50Hz ring signal(sine wave)	Dependent on country
			RGU plugged: 25Hz ring signal(square wave)	adaptation.
		1-1 ( OFF)	ON: For database protection.	Turn ON the switch
SW 1			OFF: For system default.	after system power on.
		1-2 (OFF)	OFF : Loop back OFF	OFF (Always)

The MBU has a two position DIP switch(SW1). The following is the function of each switch position :

Knob 1 System data base initialization when power on

-. On : Do not initialize system data base when power on.

-. Off : Initialize system data base when power on.

Knob 2 ISDN Loop Back on

-. On : Loop Back on

-. Off : Loop Back off

Before programming the system, SW1(knob 1) should be placed in the Off position and turn the system power off and on to initialize the system database to default. Once the database has been initialized, SW(knob 1) should be placed in the on position to protect the database in the memory. Refer to Figure 3.4.3.

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