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Chapter3 Troubleshooting
Diagnosing Problems
3-4
Catalyst 3550 Multilayer Switch Hardware Installation Guide
78-11358-03
No connectivity Incorrect or bad cable
The following are results of no link
at both ends:
• A crossover cable was used
when a straight-through was
required, or vice-versa.
• The cable is wired incorrectly.
• A crossover or straight-through
cable is wired incorrectly.
• STP checking for possible
loops.
• For the correct pinouts and
the proper application of
crossover vs.
straight-through cables, see
the “Two Twisted-Pair
Cable Pinouts” section on
page B-7.
• Replace with a tested good
cable.
• For 1000BASE-T
connections, be sure to use
a twisted four-pair,
Category 5 cable.
• Wait 30 seconds for the port
LED to turn green.
Switch not recognizing a GBIC
module.
Refer to the your GBIC
documentation for more
information.
Unreadable characters on the
management console
Incorrect baud rate. Reset the emulation software to
9600 baud.
Table 3-2 Common Problems and Their Solutions (continued)
Symptom Possible Cause Resolution
- Hardware Installation Guide 1
- All rights reserved 3
- CONTENTS 5
- 3 Troubleshooting 3-1 7
- Contents 10
- 78-11358-03 10
- Audience 11
- Organization 12
- Conventions 12
- Waarschuwing 13
- Varoitus 13
- Related Publications 15
- Obtaining Documentation 16
- Ordering Documentation 17
- Documentation Feedback 17
- Cisco.com 18
- Technical Assistance Center 18
- Cisco TAC Web Site 19
- Cisco TAC Escalation Center 20
- Product Overview 21
- Features 22
- Front-Panel Description 25
- 10/100 and 10/100/1000 Ports 28
- GBIC Module Slots 29
- System LED 36
- Port LEDs and Modes 37
- 10/100 and 10/100/1000 ports 38
- GBIC ports 38
- Bandwidth Utilization 39
- < 25% + 40
- 25% – 49% + 40
- Rear-Panel Description 41
- Power Connectors 43
- Management Options 44
- • CiscoView application 45
- • SNMP network management 45
- Network Configurations 46
- Preparing for Installation 48
- EMC Regulatory Statements 50
- Site Requirements 52
- Verifying Package Contents 53
- Installing the Switch 54
- 3550-24-DC Switches 59
- Phillips 60
- 24" Configuration 60
- 19" Configuration 61
- Attaching the Cable Guide 63
- Cable guide screw 64
- Wall Mounting 65
- User-supplied 67
- Installing the GBIC Modules 68
- Powering On the Switch 70
- Connecting to DC Power 71
- Grounding the Switch 72
- Insulation 73
- Wire lead 73
- 0.5 in. (12.7 mm) 73
- 0.02 in. (0.5 mm) 73
- Torque to 15 lbf-in 74
- INPUT 36 - 72 V 76
- CURRENT: 2 - 1A 76
- Tie wrap 79
- Running Post 80
- Catalyst 3550 85
- 100-240V~ 87
- Where to Go Next 88
- Troubleshooting 89
- Diagnosing Problems 90
- Chapter3 Troubleshooting 92
- Amber System LED 93
- Technical Specifications 95
- 3550-24-FX 96
- Connector Specifications 99
- 231 45678Pin Label 100
- 10/100 Ports 101
- 100BASE-FX Ports 102
- 1000BASE-X GBIC Module Ports 103
- 1000BASE-T GBIC Module Port 103
- Console Port 104
- GigaStack GBIC Module Ports 104
- Identifying a Rollover Cable 108
- Adapter Pinouts 108
- Signal DB-9 Pin Signal 109
- Signal DB-25 Pin Signal 109
- Translated Safety Warnings 111
- Service Personnel Warning 112
- Qualified Personnel Warning 113
- Installation Warning 114
- Jewelry Removal Warning 116
- Avvertenza 117
- Advarsel 117
- ¡Advertencia! 117
- Varning! 117
- Stacking the Chassis Warning 118
- Main Disconnecting Device 119
- Overtemperature Warning 120
- Attention 121
- Ground Connection Warning 122
- Grounded Equipment Warning 123
- Lightning Activity Warning 124
- Product Disposal Warning 125
- Switch Installation Warning 133
- Restricted Access Warning 136
- Class 1 Laser Product Warning 140
- Laser Beam Exposure Warning 141
- Numerics 143
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