Cisco Catalyst 3920 Installation Manual

Installing the Catalyst 3920

This chapter explains the process you should follow to install the Catalyst 3920 Token Ring Switch.

Planning for Installation

Read this section carefully before installing the Catalyst 3920 Token Ring Switch. It contains the
information on preinstallation planning.

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Note Before installing the Catalyst 3920, read the “Safety Warnings” appendix.

Warning Read the installation instructions before you connect the system to its power source.

If you have a large network, we recommend that you create a sketch of the network to which you
will add one or more Catalyst 3920 switches. Include major network elements such as hubs and
concentrators, servers, bridges, and routers.

To plan for the installation of a Catalyst 3920, obtain all connectivity and physical planning
information about thenetworksegments to which you will attach. In addition, if you are planning to
use permanently installed telecommunications wiring, you should have information about the
cabling installation that will allow you to determine the termination points of every cable, the cable
type, connector type (if any), and the distance between termination points. Building floorplans and
telecommunications closet layouts are also useful.

Cabling Used Between Devices

Devices attached to the RJ-45 jacks on the front of the Catalyst 3920 should conform to the cabling
rules established in the EIA/TIA 568A and ISO/IEC 11801:1995. Straight-through cables should
always be used for the Token Ring ports. Because all ports operate at 120-ohm, no
impedance-matching balun or filtering is required for UTP or STP.

For more information about cabling distances and specifications, refer to the “Cable and Pin
Information” appendix for cable design specifications.

Installing the Catalyst 3920 3-1

Installation Summary

Dedicated Media

For installations where permanently installed building cable is available,100-ohm UTP Category 3,
4, or 5 can be used. IBM Cabling System 150-ohm, STP cables (types 1 and 9) can also be used.
Because the RJ-45 connectors on the Catalyst 3920 use pins 3, 4, 5, and 6, a cable with an IBM STP
data connector on one end and an RJ-45 connector on the other must be constructed.

Shared Media

The types of cables that can be used are the same as those described above for dedicated-media
segments. The acceptable distances are defined by the hub or concentrator attached to the
Catalyst 3920 port.

Installation Summary

The basic installation steps are as follows:

• Unpacking the Catalyst 3920

• Gathering Other Materials You Will Need

• Setting Up the Catalyst 3920

• Cabling the Catalyst 3920

• Cabling a Catalyst Stack Configuration

• Powering On the Catalyst 3920

Unpacking the Catalyst 3920

To unpack the Catalyst 3920, follow these steps:

Step 1 Open the carton. Along with the Catalyst 3920 Token Ring Switch User Guide, the

package should contain:

• Catalyst 3920

• Power cord

• Accessory kit (includes the manual, rack mounting brackets and screws, surface

mounting chassis feet, and electrostatic wrist strap)

If any item is missing or damaged, contact your Cisco Systems representative.

Step 2 Remove the power cord and bag containing the accessory kit.
Step 3 Remove the Catalyst 3920 from its protective packaging.
Step 4 Visually inspect the Catalyst 3920 to ensure that it was not damaged during shipment.

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Catalyst 3920 Token Ring Switch User Guide

Gathering Other Materials You Will Need

To install the Catalyst 3920, you need the following items:

• If the unit will be installed in a rack, you need:

— Rack inventory chart and a cabling chart from your network administrator.
— Four screws appropriate for your rack and a screwdriver. (Make sure that you have the

appropriate screws before you begin installation.)

• If the unit will be installed as standalone equipment (such as on a tabletop), you will need:

— Cabling chart from your network administrator.

Setting Up the Catalyst 3920

Determine whether the switch will be mounted in a rack or as standalone equipment on a surface,
such as on a tabletop.

Warning To prevent bodily injury when mounting or servicing this unit in a rack, you must take

special precautions to ensure that the system remains stable. The following guidelines are provided
to ensure your safety:

• The unit should be mounted at the bottom of the rack if it is the only unit in the rack.

• When mounting the unit in a partially filled rack, load the rack from the bottom to the top with

the heaviest component in the bottom of the rack.

• If the rack has stabilizing devices, install the stabilizers before mounting or servicing the unit in

the rack.

Rack Mounting the Catalyst 3920

Only fixed brackets are supplied with these units. If you want to install a sliding pull-out mount, you
will need to provide the extra mounting hardware. Follow these steps to mount the Catalyst 3920 in
a rack:

Step 1 Look at the rack inventory chart provided by your network administrator to determine

where in the rack the Catalyst 3920 should be mounted.

Step 2 Obtain the L-shaped mounting brackets and four 8-mm M5 screws that are supplied with

the unit in the accessory kit.

Step 3 Using a Phillips (cross-head) screwdriver, attach an L-shaped mounting bracket to each

side of the Catalyst 3920 with two 8-mm M5 screws (see Figure 3-1).

Installing the Catalyst 3920 3-3