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CHAPTER 3 NDA-24296
Page 464
Revision 1.0
PA-24CCTA
Common Channel Trunk
PA-24CCTA
Common Channel Trunk
1. General Function
The PA-24CCTA (24CCT) circuit card provides an interface between 24 digital trunks and the system at
1.5 M bit/s. Being equipped with a Common Channel Handler (CCH), which can be allocated to a desired
channel among the existing 24 channels by key setting and programming, this card can be used as an inter-
face for a Common Channel Interoffice Signaling (CCIS) system. A built-in resonance circuit can be used
for the purpose of extracting clock signals 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 setting and programming.
Figure 3-137 Location of PA-24CCTA (24CCT) within the System
I/O Local Bus
CPU
System Clock
INT TSW INT
Common Channel Signaling Link
PLO
1.544 MHz Clock Extraction
(For PLO-secondary switch)
CCH
Built-in Common Channel Handler (x1)
T
R
24CCT
: Common Channel Signaling Link
: Speech Path (PCM Signal)
: Clock Signal
CCIS
NETWORK