Removing and Installing Port Adapters
This chapter describes how to remove the PA-4R-DTR from supported platforms and also how to install a new or replacement port adapter. This chapter contains the following sections:
•Handling Port Adapters
•Online Insertion and Removal
•Warnings and Cautions
•Port Adapter Removal and Installation
•Connecting a PA-4R-DTR Interface Cable
Each port adapter circuit board is mounted to a metal carrier and is sensitive to electrostatic discharge (ESD) damage.
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.
When powering off the router, wait a minimum of 30 seconds before powering it on again.
Handling Port Adapters
Always handle the port adapter by the carrier edges and handle; never touch the port adapter components or connector pins. (See
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-4R-DTR in Cisco 7100 series routers and Cisco 7200 series routers.
Although the VIP2 supports online insertion and removal, individual port adapters do not. To replace port adapters, you must first remove the VIP2 from the chassis and then install or replace port adapters as required. If a blank port adapter is installed on the VIP2 on which you want to install a new port adapter, you must first remove the VIP2 from the chassis and then remove the blank port adapter.
To prevent system problems, do not remove port adapters from the VIP2 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 VIP2 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 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.
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.
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.
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 7100 Series—Removing and Installing a Port Adapter
•Cisco 7200 Series—Removing and Installing a Port Adapter
•VIP2—Removing and Installing a Port Adapter
Cisco 7100 Series—Removing and Installing a Port Adapter
Cisco 7200 Series—Removing and Installing a Port Adapter
VIP2—Removing and Installing a Port Adapter
Connecting a PA-4R-DTR Interface Cable
After installing the PA-4R-DTR, you need one Token Ring interface cable for each PA-4R-DTR interface you want to use. Token Ring interface cables are not available from Cisco but are commercially available through outside cable vendors.
Use the following procedure to connect RJ-45 cables to the PA-4R-DTR:
Step 1 Determine which PA-4R-DTR ports you want to use.
Note The IBM Token Ring specifies a star topology with all end stations connected through a device called a MSAU or Token Ring switch. IEEE 802.5 does not specify any topology, although most implementations are based on a star configuration with end stations attached to a device called an MAU or to a Token Ring switch. Also, IBM Token Ring specifies twisted-pair cabling, whereas IEEE 802.5 does not specify media type. Most Token Ring networks use FTP cabling; however, some 4-Mbps networks use UTP cable.
Step 2 Attach the port adapter end of a Token Ring interface cable, or other connection equipment, to the interface port. (See Figure 3-2.)
Note Port adapters have a handle attached, but this handle is not shown to allow a full view of detail on the PA-4R-DTR port adapter faceplate.
Figure 3-2 Token Ring Interface Cable Connections
Each PA-4R-DTR interface must be configured for the same ring speed as the ring to which it is connected (4 or 16 Mbps). If the PA-4R-DTR interface is set for a different speed, it causes the ring to beacon, which brings down the ring.
Step 3 Attach the network end of the Token Ring interface cable to the appropriate Token Ring equipment at your site (MAU, MSAU, or Token Ring switch).
This completes the procedure for attaching a PA-4R-DTR interface cable.