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Invisible laser radiation may be emitted from disconnected fibers or

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Cleaning the Fiber-Optic Connectors Chapter 4 Transceiver Modules Connector loss, or insertion loss, is a critical performance characteristic of a fiber-optic connector. Return loss is also an important factor. Return loss specifies the amount of reflected light; the lower the reflection, the better the connection. The best physical contact connectors have return losses greater than -40 dB, although -20 to -30 dB is more common. The connection quality depends on the type of connector and the proper cleaning and connection techniques. Dirty fiber connectors are a common source of light loss. Keep the connectors clean at all times, and keep the dust covers installed when the connectors are not in use. Before installing any type of cable or connector, use a lint-free alcohol pad from a cleaning kit to clean the ferrule, the protective white tube around the fiber, and the end-face surface of the fiber. As a general rule, whenever there is a significant, unexplained loss of light, clean the connectors. Caution Use extreme care when removing or installing connectors so that you do not damage the connector housing or scratch the end-face surface of the fiber. Always install protective covers on unused or disconnected components to prevent contamination. Always clean fiber connectors before installing them. To clean the optical connectors, use a CLETOP cassette cleaner (type A for SC connectors or type B for MT-RJ connectors) and follow the product directions. If a CLETOP cassette cleaner is not available, follow these steps: Step 1 Step 2 Use a lint-free tissue soaked in 99 percent pure isopropyl alcohol to gently wipe the faceplate. Wait five seconds for the surfaces to dry, and repeat. Remove any residual dust from the faceplate with clean, dry, oil-free compressed air. Warning Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or view directly with optical instruments. Statement 1051 Catalyst 4900 Series Switch Installation Guide 4-6 78-18039-02

Section	Page
Catalyst 4900 Series Switch Installation Guide	1
Contents	5
Preface	9
Product Overview	23
Catalyst 4900 Series Switch Applications	24
Catalyst 4948 Switch Software Features	25
Catalyst 4948-10GE and Catalyst 4928-10GE Switch Software Features	26
Hardware System Features	28
Switch Components	29
Traffic Ports on the Catalyst 4948	29
Traffic Ports on the Catalyst 4948-10GE	29
Traffic Ports on the Catalyst 4928-10GE	29
Console Port	29
Front Panel LEDs	31
Chassis Cooling	33
Power Supplies	34
Environmental Monitoring of the Power Supplies	35
Power Management for the Switch	36
Power Management Modes	36
Site Planning	37
Site Environmental Requirements	37
Site Power Requirements	38
Pre-installation Requirements	39
Warnings and Cautions	39
EMI Recommendations	40
Power Requirements and Heat Dissipation	40
Grounding Requirements	42
Safety Overview	43
Ensuring Safety	43
Working Safely with Electricity	44
Preventing Electrostatic Discharge Damage	45
Site Planning Checklist	45
Installing the Switch	47
Verifying the Contents	47
Rack-Mounting the Switch	48
Rack-Mounting Guidelines	49
Lifting the Chassis Safely	51
Required Installation Tools	51
Rack-Mounting the Switch	52
Connecting AC Power to the Switch	55
Connecting DC Power to the Switch	57
Transceiver Modules	61
SFP Modules	61
SFP Modules and Alternative Wiring	61
X2 Modules	62
Module Maintenance Guidelines	65
Cleaning the Fiber-Optic Connectors	65
Additional Guidelines	67
Troubleshooting the Installation	69
Getting Started	70
Problem Solving to the System Component Level	70
Identifying Startup Problems	71
LED Readings	71
Troubleshooting the Power Supply	73
Contacting Customer Service	74
Specifications	75
Console Port	75
Management Port	76
Catalyst 4900 Series Switch Specifications	77
Initial Configuration for the Switch	79
Connecting to the Switch	80
Starting the Terminal-Emulation Software	81
Connecting to a Power Source	81
Entering the Initial Configuration Information	82
IP Settings	82
Performing the Initial Configuration	83
Compliance Information and Translated Safety Warnings	87
Translated Safety Warnings	88
Statement 1003-DC Power Disconnection	88
Statement 1004-Installation Instructions	90
Statement 1006-Chassis Warning for Rack-Mounting and Servicing	92
Statement 1008-Class 1 Laser Product	100
Statement 1011-Staring into Laser Beam	102
Statement 1017-Restricted Area	104
Statement 1019-Main Disconnecting Device	107
Statement 1024-Ground Conductor	109
Statement 1030-Equipment Installation	111
Statement 1040-Product Disposal	113
Statement 1045-Short-circuit Protection	116
Statement 1051-Laser Radiation	119
Statement 1074-Comply with Local and National Electrical Codes	122
Statement 1075-Hazardous Voltage or Energy Present on DC Power Terminals	123
Regulatory Standards Compliance	125
European Directives	128
Statement 287-Declaration of Conformity to R&TTE Directive 1999/5/EC for the European Community, Switzerland, Norway, Iceland and Liechtenstein	128
Statement 275-Declaration of Conformity with Regard to the Directives 73/23/EEC and 89/336/EEC as amended by Directive 93/68/EEC	130
California Perchlorate Contamination Prevention Act (Title 22, California Code of Regulations, Chapter 33)	132
EMC Class A Notices and Warnings	132
Class A Notice for FCC	132
Class A Notice for Canada	133
Statement 340-Class A Warning for CISPR22	133
Statement 191-VCCI Class A Warning for Japan	136
Statement 256-Class A Warning for Hungary	137
Statement 294-Class A Warning for Korea	137
Statement 257-Class A Notice for Taiwan and Other Traditional Chinese Markets	138
Statement 371-Power Cable and AC Adapter	138

Match case Limit results 1 per page

Chapter 4

Transceiver Modules

Cleaning the Fiber-Optic Connectors

4-6

Catalyst 4900 Series Switch Installation Guide

78-18039-02

Connector loss, or insertion loss, is a critical performance characteristic of a

fiber-optic connector. Return loss is also an important factor. Return loss specifies

the amount of reflected light; the lower the reflection, the better the connection.

The best physical contact connectors have return losses greater than –40 dB,

although –20 to –30 dB is more common.

The connection quality depends on the type of connector and the proper cleaning

and connection techniques. Dirty fiber connectors are a common source of light

loss. Keep the connectors clean at all times, and keep the dust covers installed

when the connectors are not in use.

Before installing any type of cable or connector, use a lint-free alcohol pad from

a cleaning kit to clean the ferrule, the protective white tube around the fiber, and

the end-face surface of the fiber.

As a general rule, whenever there is a significant, unexplained loss of light, clean

the connectors.

Caution

Use extreme care when removing or installing connectors so that you do not

damage the connector housing or scratch the end-face surface of the fiber. Always

install protective covers on unused or disconnected components to prevent

contamination. Always clean fiber connectors before installing them.

To clean the optical connectors, use a CLETOP cassette cleaner (type A for SC

connectors or type B for MT-RJ connectors) and follow the product directions. If

a CLETOP cassette cleaner is not available, follow these steps:

Step 1

Use a lint-free tissue soaked in 99 percent pure isopropyl alcohol to gently wipe

the faceplate. Wait five seconds for the surfaces to dry, and repeat.

Step 2

Remove any residual dust from the faceplate with clean, dry, oil-free compressed

air.

Warning

Invisible laser radiation may be emitted from disconnected fibers or

connectors. Do not stare into beams or view directly with optical instruments.

Statement 1051