Direct Digital Interface (Ddi) - NEC NEAX 2000 Programming Manual

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
DTI
PLO
CLOCK SIGNAL
PLO: PHASE LOCKED
DTI: 24/30 CHANNEL
MP
DIRECT DIGITAL INTERFACE (DDI)
24/30 CHANNEL PCM
DIGITAL LINE
DTI
PLO
OSCILLATOR
DIGITAL TRUNK
INTERFACE
– 195 –
SYSTEM OUTLINE
DIGITAL
PBX
MP
A2195-10