Zhone Technologies 600 User Manual
5-6
Server Cards
Model No.
Running Head
Introduction
ISDN-PRI Card
Figure 5-4 shows how the application in Figure 5-3 would be set up if the user’s PBX was not
connected to the system.
connected to the system.
The disadvantage of this configuration is that the PBX may not be able to support two D
channels, may not be able to handle the differences in D channel protocols between the two
carriers, and may not be able to route calls to the appropriate carrier.
channels, may not be able to handle the differences in D channel protocols between the two
carriers, and may not be able to route calls to the appropriate carrier.
Figure 5-4. ISDN-PRI Links to Two Carriers
Carrier A
ISDN Switch
Carrier B
ISDN Switch
User Side
User Side
Network Side
Network Side
23B+D
23B+D
ISDN PBX