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GDK-20W DIGITAL WIRELESS KEY TELEPHONE SYSTEM
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SECTION 2. GENERAL DESCRIPTION
2.1 INTRODUCTION
The GDK-20W Digital Wireless Key Telephone System is a fully digital hybrid Key Telephone System, designed to meet
the telecommunication needs of small sized business offices & home base.
The GDK-20W System incorporates state-of-the-art digital technology for command processing and voice switching,
utilizing a Pulse Code Modulation/Time Division Multiplexing (PCM/TDM) distributed switching matrix. The system
supports both "A" and "Mu" law voice encoding rule based on the requirements of local regulations and the ADPCM voice
coding to support DECT(Digital Enhanced Cordless Telecommunications) services.
The GDK-20W KSU(Key Service Unit) is wall mounted cabinet that house the MBU(Main Board Unit) and contain card
slots for the CO line boards, extension boards and other useful PCBs. There are 6 slots in the system, the 1
st
fixed
slot(slot1) is used to install only the DVIB/DVIBE(Digitized voice interface board) card, the 2
nd
,3
rd
fixed slots(slot2, slot3)
are used to install one of the LCOB/LCOB2/LCOBE/LCOBA/LCOB4 or STIB/STIB2, the 4
th
fixed slot(slot 4) is used to
install only the PMU(Program Module Unit) card and the 5
th
fixed slot(slot 5) is used to install the WTIB(Wireless terminal
interface board) card. And the 6
th
fixed slot(slot6) is used to install only the MFB(Multi function board) card.
The GDK-20W System achieves a high level of flexibility by providing support for different types of instrumentation.
The system architecture has been designed to allow a high level of software control over the system's hardware. The
software incorporates a vast array of features and capabilities including PC Database Administration, ISDN feature,
Remote software downloading, etc.
The GDK-20W System supports a combination of Digital Keysets(LKD, KD, KD/E, KD/S, KD/C series), DECT
terminals(GDC-335H, GDC-340H), and various kinds of ISDN terminals as well as analogue single line devices. With the
keysets, commonly used features are activated by direct button selection. Additionally, many functions may be accessed
by dialing specific codes or optionally, by assigning these dial codes to Flexible Buttons on the keyset. In addition to key
telephones, an array of optional terminals is available including Intercom/Door Box
With the flexibility of the GDK-20W extensive feature content and the capability to use an array of instruments, the GDK-
20W can be tailored to meet the short and long term needs of the most demanding customer requirements.
* Note : The CO board(LCOB/LCOB2/LCOBE/LCOBA/LCOB4/STIB/STIB2), DVIB/DVIBE and MFB are used in common
with GDK-16 Digital Key Telephone System.