3-3
PA-MC-T3 Port Adapter Installation and Configuration
OL-2695-05
Chapter 3 Removing and Installing Port Adapters
Warnings and Cautions
Each port adapter has a bus connector that connects it to the router. The connector has a set of tiered pins
in three lengths that send specific signals to the system as they make contact with the port adapter. The
system assesses the signals it receives and the order in which it receives them to determine if a port
adapter is being removed from or introduced to the system. From these signals, the system determines
whether to reinitialize a new interface or to shut down a disconnected interface.
Specifically, when you insert a port adapter, the longest pins make contact with the port adapter first, and
the shortest pins make contact last. The system recognizes the signals and the sequence in which it
receives them.
When you remove or insert a port adapter, the pins send signals to notify the system of changes. The
router then performs the following procedure:
1.
Rapidly scans the system for configuration changes.
2.
Initializes newly inserted port adapters or administratively shuts down any vacant interfaces.
3.
Brings all previously configured interfaces on the port adapter back to their previously installed
state. Any newly inserted interface is put in the administratively shutdown state, as if it was present
(but not configured) at boot time. If a similar port adapter type is reinserted into a slot, its ports are
configured and brought online up to the port count of the originally installed port adapter of that
type.
Note
Before you begin installation, read
Chapter 2, “Preparing for Installation,”
for a list of parts and tools
required for installation.
Warnings and Cautions
Observe the following warnings and cautions when installing or removing port adapters.
Caution
Each port adapter circuit board is mounted to a metal carrier and is sensitive to electrostatic discharge
(ESD) damage.
Warning
Blank faceplates and cover panels serve three important functions: they prevent exposure to
hazardous voltages and currents inside the chassis; they contain electromagnetic interference (EMI)
that might disrupt other equipment; and they direct the flow of cooling air through the chassis. Do not
operate the system unless all cards, faceplates, front covers, and rear covers are in place.
Statement 1029
Caution
When powering off the router, wait a minimum of 30 seconds before powering it on again.
Caution
Do not slide a port adapter all the way into the slot until you have connected all required cables. Trying
to do so disrupts normal operation of the router or switch.
