NDA-24296 CHAPTER 3
Page 453
Revision 1.0
PA-2CCHA
Commo n Channel Handler

PA-2CCHA

Common Channel Handler

1. General Function

Equ ipp ed w i t h t w o ci rcu i t s of C o mmon Ch an n el H an d l ers (CC H s) , the PA-2CCH A circ u it card pr o v id es

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 t o a D i gital Trunk

Interface (DTI) card with a flat cable to exchange common channel signals as illustrated bel ow. To support

an a nal o g CCIS system, t h is car d als o has an RS-232c interfa c e for M odem(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