Hardware Reference
17
C613-03022-00 REV F
5.
Secure the NSM
When the thumbscrews hit the threaded bushes, preventing the NSM from
being pushed in further, turn the thumbscrews to engage their threads.
Tighten both thumbscrews at the same rate to pull the NSM into position.
The screws will both tighten when the NSM panel is in its installed
position, about .5mm proud of the switch or router rear panel. The
thumbscrews should be firm, but not over-tight.
If one thumbscrew becomes tight before the other, loosen it slightly before
proceeding.
6.
Installing PICs in the AT-AR040 NSM
If you have PICs to install, install them now by following the
Port Interface
Card Quick Install Guide
. If there are more PIC bays than PICs, use the bays
on the switch or router base unit first, then fill the NSM PIC bays, starting
with bay 0.
7.
Return the NSM bay to use
Press the recessed Hot Swap button. The Swap LED will go out and the
In Use LED will light.
If the In Use LED lights only briefly and the Swap LED then lights
continuously, the NSM is of a type that the software release does not
support.
8.
Verify the installation
Check that the switch or router has recognised the NSM. Use the SHOW
SYSTEM command. If there is no NSM entry in the output, the switch or
router has failed to recognise the NSM.
If the In Use LED fails to light or Recognition fails, repeat the installation
process, paying particular attention to steps 4 and 5.
If the reinstallation fails, use the Standard Installation Method or see
the“Troubleshooting” on page 19.
Behaviour of Hot Swapped Interfaces
When an interface (PIC or NSM) is hot-swapped out, its interface instances
become dormant. They stay dormant until either another interface of the same
type is hot-swapped into the bay, in which case they are reactivated, or an
interface of a different type is hot-swapped into the bay, in which case they are
discarded.
Dormant interfaces are included in the SHOW INTERFACE command output
and in the SNMP interfaces MIB, marked as swapped out. In other switch or
router commands, however, the switch or router behaves as though dormant
interfaces do not exist.
Instances of higher-level modules (such as LAPD and Q931, ISDNCC, PPP, and
IP) do not become dormant when an interface becomes dormant. Instead they
behave as if the interface has stopped communicating, for example, as if the
cable has been unplugged.
The configuration script is not scanned for commands relating to hot-inserted interfaces
until the switch or router is restarted. These interfaces must be configured manually.
