NEC NEAX 2000 - Direct Digital Interface (DDI)

DIRECT DIGITAL INTERFACE (DDI)
SYSTEM OUTLINE
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A2195-10
DIRECT DIGITAL INTERFACE (DDI)
SYSTEM OUTLINE
The PBX is equipped with Direct Digital Interface which can be interfaced with a Tie Line or Public
Network of
• 24-channel PCM Digital Line (1.544 MHz)
• 30-channel PCM Digital Line (2.048 MHz)
To add a Direct Digital Interface to the system, it is necessary to install a DTI (Digital Trunk Inter-
face) card. Figure below shows the system outline of the Direct Digital Interface of the PBX.
System Outline of Direct Digital Interface
TDSW
24/30 CH 24/30 CHANNEL PCM
DIGITAL LINE
CLOCK SIGNAL
PLO: PHASE LOCKED
OSCILLATOR
DTI: 24/30 CHANNEL
DIGITAL TRUNK
INTERFACE
DTI
PLO
MP
DTI
PLO
MP
DIGITAL
PBX