Site Planning

Warning Before you install, operate, or service the system, read the Site Preparation and Safety Guide. This guide contains important safety information you should know before working with the system.

This chapter describes how to prepare your site for the installation of your switch and contains these sections:

Note A site-planning checklist is provided in the "Site Planning Checklist" section to help ensure that you complete all site-planning activities before you install the switch.

Site Power Requirements and Heat Dissipation

Note Catalyst 2948G and 2980G switches have an internal power supply. The Catalyst 2948G switch also has an optional Redundant Power Supply Unit (RPSU) for redundant operation.

This section provides site power requirements and heat dissipation specifications for the Catalyst 2948G and 2980G switches. You should verify site power before you install the switch. Power requirements may vary for each Catalyst family switch.

Knowing the power requirements can be useful for planning the power distribution system needed to support the switches. The heat dissipation specification is an important consideration for sizing the air-conditioning requirements for an installation.

Note Refer to the Site Preparation and Safety Guide for site power requirements, preinstallation requirements, and EMI recommendations.

Table 2-1 describes the power requirements and heat dissipation specifications for the Catalyst 2948G and 2980G switches.

Table 2-1: Power Requirements and Heat Dissipation Specifications

Model Number/
Module Type DC-Output
Power (Watts) AC-Input
Power (Watts) Heat Diss (BTU/HR) Input Current at 90 VAC (Amps) Input Current at 120 VAC (Amps) Input Current at 180 VAC (Amps) Input Current at 240 VAC (Amps)

Catalyst 2948G switch

120

200

645

2.0

1.6

1.0

0.8

Catalyst 2980G switch

175

300

950

3.0

2.4

1.6

1.2

Model Number/ Module Type	DC-Output Power (Watts)	AC-Input Power (Watts)	Heat Diss (BTU/HR)	Input Current at 90 VAC (Amps)	Input Current at 120 VAC (Amps)	Input Current at 180 VAC (Amps)	Input Current at 240 VAC (Amps)
Catalyst 2948G switch	120	200	645	2.0	1.6	1.0	0.8
Catalyst 2980G switch	175	300	950	3.0	2.4	1.6	1.2

System Ground Connection Guidelines

Two system (earth) grounding holes are provided in an enclosure near the power supplies. See Figure 2-1 for the location of the grounding holes on the Catalyst 2948G switch and Figure 2-2 for the location on the Catalyst 2980G switch.

Figure 2-1: Catalyst 2948G Grounding Holes

Figure 2-2: Catalyst 2980G Grounding Holes

To make an adequate grounding connection, you will need the following equipment and tools:

Grounding lug---The grounding lug must have two M4 screw holes. See Figure 2-1 for the location of the M4 screw holes on the Catalyst 2948G switch and Figure 2-2 for the Catalyst 2980G switch.

: The grounding lugs are not available from Cisco Systems; any electrical-connector vendor can provide this lug.

Two M4 (metric) hex-head screws with locking washers---These screws are not available from Cisco Systems; they are available from any commercial hardware vendor.
One grounding wire (6 AWG recommended)---The length of the grounding wires depends on the location of your switch within the site and its proximity to proper grounding facilities. The grounding wire is not available from Cisco Systems; it is available from any commercial cable vendor.
Number 2 Phillips head screwdriver.
Crimping tool---This tool must be large enough to accommodate the girth of the grounding lug when you crimp the grounding cable into the lug.
Wire-stripping tool.

Connecting System Ground

This section describes how to connect the Catalyst 2948G and 2980G switches to earth ground. It is strongly recommended that you complete this procedure before connecting system power or turning on your switch.

To attach the grounding lug and cable to the grounding receptacle on the Catalyst 2948G and 2980G switches, perform the following steps:

Step 1 Use a wire-stripping tool to remove approximately 0.75 inch (19 mm) of the covering from the end of the grounding wire.

Step 2 Insert the stripped end of the grounding wire into the open end of the grounding lug.

Step 3 Use the crimping tool to secure the grounding wire in place in the grounding lug.

Step 4 Locate the grounding receptacle on the switch.

See Figure 2-3 for the location of the grounding receptacle on the Catalyst 2948G switch and Figure 2-4 for the Catalyst 2980G switch.

Figure 2-3: Connecting System Ground on the Catalyst 2948G Switch

Figure 2-4: Connecting System Ground on the Catalyst 2980G Switch

Step 5 Remove the label that covers the grounding receptacle.

Step 6 Place the grounding lug against the grounding receptacle on the side panel of the switch.

Step 7 Insert two screws through the holes in the grounding lug and the grounding receptacle. Ensure that the grounding lug will not interfere with other switch hardware or rack equipment.

Step 8 Install the locking washers and nuts; tighten them to secure the grounding lug to the grounding receptacle.

Step 9 Prepare the other end of the grounding wire and connect it to an appropriate grounding point in your site to ensure adequate earth ground for the switch.

Site Plan ning Checklist

Table 2-2 lists the site-planning activities that you should complete before you install the Catalyst 2948G and 2980G switches. Completing each activity helps ensure a successful switch installation.

Table 2-2: Site Planning Checklist

Task No. Planning Activity Verified By Time Date

1

Space evaluation:

Space and layout
Floor covering
Impact and vibration
Lighting
Maintenance access

2

Environmental evaluation:

Ambient temperature
Humidity
Altitude
Atmospheric contamination
Airflow

3

Power evaluation:

Input power type
Receptacle proximity to the equipment
Dedicated (separate) circuits for redundant power supplies
UPS for power failures

4

Grounding evaluation:

Circuit breaker size

5

Cable and interface equipment evaluation:

Cable type
Connector type
Cable distance limitations
Interface equipment (transceivers)

6

EMI evaluation:

Distance limitations for signaling
Site wiring
RFI levels

Task No.	Planning Activity	Verified By	Time	Date
1	Space evaluation: Space and layout Floor covering Impact and vibration Lighting Maintenance access
2	Environmental evaluation: Ambient temperature Humidity Altitude Atmospheric contamination Airflow
3	Power evaluation: Input power type Receptacle proximity to the equipment Dedicated (separate) circuits for redundant power supplies UPS for power failures
4	Grounding evaluation: Circuit breaker size
5	Cable and interface equipment evaluation: Cable type Connector type Cable distance limitations Interface equipment (transceivers)
6	EMI evaluation: Distance limitations for signaling Site wiring RFI levels

Table of Contents

Site Planning

Site Planning

Site Power Requirements and Heat Dissipation

System Ground Connection Guidelines

Connecting System Ground

Site Planning Checklist

Site Plan ning Checklist