3-3
PA-2CE1 Channelized E1 Port Adapter Installation and Configuration
OL-3519-01
Chapter
Warnings and Cautions
Each module 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 module. The system
assesses the signals it receives and the order in which it receives them to determine if a module 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 module, the longest pins make contact with the module 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 module, the pins send signals to notify the system of changes. The router
then perfoms 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 module 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 module type is reinserted into a slot, its ports are configured
and brought online up to the port count of the originally installed module 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
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.
Note
If a port adapter lever or other retaining mechanism does not move to the locked position,
the port adapter is not completely seated in the midplane. Carefully pull the port adapter
halfway out of the slot, reinsert it, and move the port adapter lever or other mechanism to
the locked position.
Caution
To prevent jamming the carrier between the upper and the lower edges of the port adapter
slot, and to ensure that the edge connector at the rear of the port adapter mates with the
connection at the rear of the port adapter slot, make certain that the carrier is positioned
correctly, as shown in the cutaway in the following illustrations.
Warning
When performing the following procedures, wear a grounding wrist strap to avoid ESD
damage to the card. Some platforms have an ESD connector for attaching the wrist strap.
Do not directly touch the midplane or backplane with your hand or any metal tool, or you
could shock yourself.
