CHAPTER 3 NDA-24296
Page 592
Revision 1.0
PA -2 4 D TR ( D TI)
Digital T runk Interface

PA-24DTR (DTI)

Dig ital Trun k Inter face

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) o r an ISDN net w o rk w h en b eing connected t o a n a dditi on a l CC H or D C H circ u it card with a flat
cable as illustrated bel ow. A built-in resonance circuit can be use d for the purpose of extractin g c l ock sig-
nals when the PBX functions as a PLO-secondary switch. To obtain appropriate speech level, this card is
equip ped with a mask ROM in whic h t ypical PAD pa tterns hav e been a lready writte n. A de sire d PAD va lue
can be easily selecte d b y k e y settings and programming f rom t he 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 I nteroffi ce S i gnali ng (ACIS) system, CCH/DCH is not required.