CHAPTER 1 GENERAL INFORMATION
– 44 – NWA-008853-001 Rev.3.0
97ch1001.fm
Determining CCH Link to Send Messages
Each system MP must be programmed with the proper information indicating to which CCH (in its own
system) every other office in the network is connected. This is required for providing inter-office services
such as Attendant Camp-On, Call Back, and Busy Verification when using CCIS. In each system, CMA8
is used to inform the local MP which system is connected through which CCH. This is extremely impor-
tant, not only for where two switches are connected to each other, but also for networks in which tandem
signaling is used.
Example 1:
• Data Assignment of Office A
• Data Assignment of Office B
Command Code 1st Data 2nd Data Remarks
CMA8 00002
00003
00004
0
0
0
Assign the data to make a CCH link with Office
B via CCH0.
Command Code 1st Data 2nd Data Remarks
CMA8 00001
00003
00004
1
0
0
Assign the data to make a CCH link with Office
C via CCH0, and make a CCH link with Office
A via CCH1.
A
B
PC: 00001
CCH0
A/B/C: Office (PBX)
CCH : Common Channel
Handler
PC : Point Code
C
D
PC: 00002
PC: 00003
PC: 00004
CCH1
CCH1
CCH0
CCH0
CCH0
NETWORK STRUCTURE CONSIDERATIONS
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