PA-24DTR (DTI)

Digital Trunk Interface

PA-24DTR (DTI)

Digital Trunk Interface

1.General Function

The PA-24DTR (24DTI) circuit card provides an interface between 24 digital trunks and the system at 1.544 Mbit/s. This card can be also used as an interface for a Common Channel Interoffice Signaling (CCIS) or an ISDN network when being connected to an additional CCH or DCH circuit card with a flat cable as illustrated below. A built-in resonance circuit can be used for the purpose of extracting clock sig- nals when the PBX functions as a PLO-secondary switch. To obtain appropriate speech level, this card is equipped with a mask ROM in which typical PAD patterns have been already written. A desired PAD value can be easily selected by key settings and programming from the MAT.

INT

I/O Local

Bus

CPU

TSW

INT

System Clock

24ch

Note

CCH/DCH

Flat Cable

 

2

T

DIGITAL

 

2NETWORK

R

DTI(PA-24DTR)

1.544MHz Clock Extraction (for a PLO-secondary office)

PLO

:Common Channel Signaling Link : Speech Path (PCM signal)

:Clock Signal

Note: When PA-24DTR is used in an Associated Channel Interoffice Signaling (ACIS) system, CCH/DCH is not required.

Figure 3-185 Location of PA-24DTR (DTI) within the System

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NEC 2400 ipx manual PA-24DTR DTI, Digital Trunk Interface

2400 ipx specifications

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