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CHAPTER 3 NDA-24296
Page 592
Revision 1.0
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.
Figure 3-185 Location of PA-24DTR (DTI) within the System
I/O Local
Bus
CPU
System Clock
INT TSW INT
CCH/DCH
Flat Cable
2
2
PLO
1.544MHz Clock Extraction
(for a PLO-secondary office)
24ch
T
R
DIGITAL
NETWORK
Note
DTI(PA-24DTR)
: 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.