Chapter 1 CCIS FEATURES
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NWA-088654-001 Rev.1.0
94ch1001.fm
NETWORK STRUCTURE CONSIDERATIONS
Determining CCH Link to Send Messages
Each system CPU 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 Call Back, and Busy Verification when using CCIS. In each system, CMA8 is used to inform the
local CPU which system is connected through which CCH. This is extremely important, 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
00
00
00
Assign the data to make a CCH link with Office
B via CCH00.
Command Code
1st Data
2nd Data
Remarks
CMA8
00001
00003
00004
01
00
00
Assign the data to make a CCH link with Office
C via CCH00, and make a CCH link with Of-
fice A via CCH01.
A
B
PC: 00001
CCH00
A/B/C: Office (PBX)
CCH : Common Channel
Handler
PC
: Point Code
C
D
PC: 00002
PC: 00003
PC: 00004
CCH01
CCH01
CCH00
CCH00
CCH00