
100 Chapter 3 • Using PPP To Provide Remote Network Access
First, we need to check the status of the physical layer:
Cisco command: show isdn stat
The current ISDN Switchtype = basic-nil
ISDN BRIO interface
Layer 1 Status:
DEACTIVATED
Layer 2 Status:
Layer 2 NOT Activated
Layer 3 Status:
No Active Layer 3 Call(s)
Activated ds1 0 CCBs = 0
Total Allocated ISDN CCBs = 0
The output above indicates that there is a problem with the physical
layer. The layer 1 status being “DEACTIVATED” indicates this. This could
be caused by a bad cable, a bad NT-1 device (or no power to an external
NT-1 device), or a bad demarc.
In this instance, we had a bad cable between the ...