PA-4T Synchronous Serial Port Adapter Installation and Configuration
Removing and Installing the PA-4T Synchronous Serial Port Adapter
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Removing and Installing Port Adapters

Table Of Contents

Removing and Installing Port Adapters

Handling Port Adapters

Online Insertion and Removal

Warnings and Cautions

Port Adapter Removal and Installation

Cisco 7200 Series—Removing and Installing a Port Adapter

VIP—Removing and Installing a Port Adapter

Connecting a PA-4T Interface Cable


Removing and Installing Port Adapters


This chapter describes how to remove the PA-4T port adapter from supported platforms and also how to install a new or replacement port adapter. This chapter contains the following sections:

When powering off the router, wait a minimum of 30 seconds before powering it on again.

Online Insertion and Removal

Warnings and Cautions

Port Adapter Removal and Installation

Connecting a PA-4T Interface Cable


Note When a port adapter slot is not in use, a blank port adapter must fill the empty slot to allow the router or switch to conform to electromagnetic interference (EMI) emissions requirements and to allow proper airflow across the port adapters. If you plan to install a new port adapter in a slot that is not in use, you must first remove the blank port adapter.



Caution When powering off the router, wait a minimum of 30 seconds before powering it on again.

Handling Port Adapters

Each port adapter circuit board is mounted to a metal carrier and is sensitive to electrostatic discharge (ESD) damage.


Caution Always handle the port adapter by the carrier edges and handle; never touch the port adapter components or connector pins. (See Figure 3-1.)

Figure 3-1 Handling a Port Adapter

Online Insertion and Removal

Several platforms support online insertion and removal (OIR) of port adapters; therefore, you do not have to power down routers when removing and replacing a PA-4T in Cisco 7200 series routers.

Although the VIP supports online insertion and removal, individual port adapters do not. To replace port adapters, you must first remove the VIP from the chassis and then install or replace port adapters as required. If a blank port adapter is installed on the VIP on which you want to install a new port adapter, you must first remove the VIP from the chassis and then remove the blank port adapter.


Caution To prevent system problems, do not remove port adapters from the VIP motherboard or attempt to install other port adapters on the motherboard when the system is operating. To install or replace port adapters, first remove the VIP from its interface processor slot.

It is wise to gracefully shut down the system before removing a port adapter that has active traffic moving through it. Removing a module while traffic is flowing through the ports can cause system disruption. Once the module is inserted, the ports can be brought back up.


Note As you disengage the module from the router or switch, online insertion and removal (OIR) administratively shuts down all active interfaces in the module.


OIR allows you to install and replace modules while the router is operating; you do not need to notify the software or shut down the system power, although you should not run traffic through the module you are removing while it is being removed. OIR is a method that is seamless to end users on the network, maintains all routing information, and preserves sessions.

The following is a functional description of OIR for background information only; for specific procedures for installing and replacing a module in a supported platform, refer to the "Port Adapter Removal and Installation" section.

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 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 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 During this procedure, wear grounding wrist straps to avoid ESD damage to the card. Do not directly touch the midplane with your hand or any metal tool, or you could shock yourself. Statement 181


Port Adapter Removal and Installation

In this section, the illustrations that follow give step-by-step instructions on how to remove and install port adapters. This section contains the following illustrations:

Cisco 7200 Series—Removing and Installing a Port Adapter

Cisco 7200 Series—Removing and Installing a Port Adapter

VIP—Removing and Installing a Port Adapter

Connecting a PA-4T Interface Cable

On a single PA-4T, you can use up to four synchronous-serial connections. Port adapters have a handle attached, but this handle is not shown to allow a full view of detail on each port adapter's faceplate.

Use the following procedure to connect serial cables to the PA-4T:


Step 1 Attach the appropriate serial cable directly to the receptacle on the PA-4T and tighten the strain-relief screws. (See Figure 3-2.)

Figure 3-2 Connecting PA-4T Serial Cables (Horizontal Orientation—Shown without Handles)


Caution Serial interface cables must be attached correctly or damage to the cable plug will result. Attempting to force a cable plug on the 60-pin receptacle can damage the plug. (See  Figure 3-3.)

Figure 3-3 Connecting Serial Port Adapter Cables

Step 2 Attach the network end of your serial cable to your DSU, CSU, DTE, or other external synchronous-serial equipment and tighten the strain-relief screws.


This completes the procedure for attaching serial interface cables to the PA-4T.