NDA-24296 CHAPTER 3
Page 453
Revision 1.0
PA-2CCHA
Common Channel Handler
PA-2CCHA
Common Channel Handler
1. General Function
Equipped with two circuits of Common Channel Handlers (CCHs), the PA-2CCH A circuit card provides
two signaling links for a digital/analog Common Channel Interoffice Signaling (CCIS) system, which can
be selected by key settings on this card. If a digital CCIS system, this card is connected to a Digital Trunk
Interface (DTI) card with a flat cable to exchange common channel signals as illustrated below. To support
an analog CCIS system, this card also has an RS-232c interface for Modem(s).
Figure 3-132 Location of PA-2CCHA (CCH) within the System
CPU
System Clock
INT SW INT
2-wire
2-wire
PLO
Clock Extraction
(For a PLO-SECONDARY switch)
CCH
DTI
Common Channel Signaling Link (x2)
I/O Local Bus
Flat Cable
CPU
INT SW INT
Analog Tie Line
CCH
TLT
Common Channel Signaling Link (x2)
I/O Local Bus
CLK
MODEM
Digital CCIS
Analog CCIS (with MODEM)
CCIS
NETWORK
CCIS
NETWORK
: Common Channel Signaling Link
: Speech Path (PCM Signal)
: Clock Signal