Installing and Operating the Passport 5430 Multiservice Access Switch
10-4
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When you want to configure more than the 4 possible circuits, for
example if there are 2 ISDN BRI adapter modules and a serial adapter
module (5 circuits in all), circuit allocation becomes an issue.
In the example above, the first ISDN BRI module (in Module slot 3) has the
resources to bring up a second B channel (thus using 2 circuits). The serial
adapter in Module slot 4 uses a third circuit. The second ISDN BRI adapter
module (in Module slot 5), can have only 1 B channel configured because the
serial adapter module (in Module slot 4) has priority and is allocated a circuit
over anything in Module slot 5. In this case, there are not enough circuits left
to utilize the second B channel on the ISDN BRI adapter in Module slot 5. In
this example, if you wished to have both B channels on both ISDN BRI
adapters configured, you would have to remove the serial card from Module
slot 4.
for examples of valid WAN adapter module combinations.