LG GDK-20W - Manual (Page 32)

GDK-20W DIGITAL WIRELESS KEY TELEPHONE SYSTEM
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But, for ISDN line connection, it is done by using the RJ45 type connector on the ISDN interface
cards(STIB2, STIB).
Music on Hold (MOH) Wiring
The GDK-20W System sends internal or external music signal to CO lines that are in hold state. The default music
source input is assigned to internal source. And the external music source can be used by changing the system database
and connect a external music source to the blue colored TERMINAL BLOCK(CN2) of the PMU.
General Purpose Relays Wiring
There are two general purpose relays in the GDK-20W system. One contact is provided in the MBU and is connected
through CN22 pin#1,2 (RELAY1) and another contact is prepared in the MFB and is connected through CN2 pin #1,
2(RELAY2). The control of these relays are done by system programming..
Also, this dry relay contact can be used to Loud Bell Control function, Door Open function, etc. under the software control.
Note that the maximum rating of the relay contact is 30Volt/3A, so, do not use over this rating.
CAUTION
-. It is possible to cause danger of high voltage and electric shock.
-. "From external source - take all appropriate safety precaution if over 50V AC"
External DC
Power Supply
DC device
e.g. Bell
GDK-20W
Internal Relay
Contact
Relay contact Max. rating - 3A at 30Vdc : resistive load