Contents
Models Covered By This Reference .................................................................... 4
Why You Should Read This Reference ............................................................... 4
Where To Find More Information ...................................................................... 4
Compatible Base Units For NSMs ...................................................................... 5
What NSMs Do ................................................................................................. 5
Operating Environment And Regulatory Standards ............................................ 6
AT-AR040 NSM ................................................................................................. 7
AT-AR041 and AT-AR042 NSMs ......................................................................... 8
Basic Rate ISDN Interfaces .......................................................................... 8
ISDN S/T Interface Cables ......................................................................... 10
Testing a BRI NSM .................................................................................... 10
Hot Swapping the AR040 NSM with PICs ................................................. 15
How to Hot Swap an NSM ....................................................................... 15
Behaviour of Hot Swapped Interfaces ....................................................... 17
LEDs and What They Mean ....................................................................... 19
