Cisco Catalyst 3750 V2 IP Base Service Manual

Catalyst 3750 Switch
Hardware Installation Guide

October 2011

Americas Headquarters

Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
USA
http://www.cisco.com
Tel: [phone]

800 553-NETS (6387)

Fax: [phone]

Text Part Number: OL-6336-10

THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL
STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT
WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS.

THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT
SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE
OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.

The following information is for FCC compliance of Class A devices: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio-frequency energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case users will be required
to correct the interference at their own expense.

The following information is for FCC compliance of Class B devices: The equipment described in this manual generates and may radiate radio-frequency energy. If it is not
installed in accordance with Cisco’s installation instructions, it may cause interference with radio and television reception. This equipment has been tested and found to
comply with the limits for a Class B digital device in accordance with the specifications in part 15 of the FCC rules. These specifications are designed to provide reasonable
protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation.

Modifying the equipment without Cisco’s written authorization may result in the equipment no longer complying with FCC requirements for Class A or Class B digital
devices. In that event, your right to use the equipment may be limited by FCC regulations, and you may be required to correct any interference to radio or television
communications at your own expense.

You can determine whether your equipment is causing interference by turning it off. If the interference stops, it was probably caused by the Cisco equipment or one of its
peripheral devices. If the equipment causes interference to radio or television reception, try to correct the interference by using one or more of the following measures:

• Turn the television or radio antenna until the interference stops.

• Move the equipment to one side or the other of the television or radio.

• Move the equipment farther away from the television or radio.

• Plug the equipment into an outlet that is on a different circuit from the television or radio. (That is, make certain the equipment and the television or radio are on circuits
controlled by different circuit breakers or fuses.)

Modifications to this product not authorized by Cisco Systems, Inc. could void the FCC approval and negate your authority to operate the product.

The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public
domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California.

NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS” WITH
ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT
LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF
DEALING, USAGE, OR TRADE PRACTICE.

IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING,
WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO
OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found at

www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership

relationship between Cisco and any other company. (1005R)

Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the
document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.

Catalyst 3750 Switch Hardware Installation Guide

© 2004-2011 Cisco Systems, Inc. All rights reserved.

Preface vii
Audience vii
Purpose vii
Conventions vii
Related Publications viii
Obtaining Documentation, Obtaining Support, and Security Guidelines ix
1
Product Overview 1
Features 1
Front Panel Description 3
Fast Ethernet Switches 3
Catalyst 3750-24FS and 3750V2-24FS Switch Front Panel 3
Catalyst 3750-24TS and 3750V2-24TS Switch Front Panel 4
Catalyst 3750-48TS and 3750V2-48TS Switch Front Panel 5
Catalyst 3750-24PS and 3750V2-24PS Switch Front Panel 5
Catalyst 3750-48PS and 3750V2-48PS Switch Front Panel 6
Gigabit Ethernet Switches 6
Catalyst 3750G-12S and Catalyst 3750G-12S-SD Switch Front Panel 6
Catalyst 3750-24T, 3750G-24TS, and 3750G-24TS-1U Switch Front Panel 6
Catalyst 3750G-48TS Switch Front Panel 8
Catalyst 3750G-24PS Switch Front Panel 8
Catalyst 3750G-48PS Switch Front Panel 9
Catalyst 3750G-16TD Switch Front Panel 9
Catalyst 3750G Integrated Wireless LAN Controller Switch Front Panel 10
10/100 and 10/100/1000 Ports 10
100BASE-FX Ports 12
SFP Module Slots 12
SFP Modules 13
XENPAK Module Slot (Catalyst 3750G-16TD Switch) 13
LEDs 13
System LED 15
RPS LED 16
Master LED 16
Port LEDs and Modes 17
Rear Panel Description 21
StackWise Ports 24
Power Connectors 25
Internal Power Supply Connector 25
DC Power Connector 25
Cisco RPS Connector 25
Console Port 26
Management Options 26
Network Configurations 27

1
Switch Installation 1
Preparing for Installation 1
Warnings 2
Installation Guidelines 6
Box Contents 7
Tools and Equipment 7
Verifying Switch Operation 7
Powering On the Switch and Running POST 7
Powering Off the Switch 8
Planning the Stack 8
Planning Considerations 8
Powering Considerations 8
Cabling Considerations 9
Recommended Cabling Configurations 10
Installing the Switch 11
Rack-Mounting 12
Removing Screws from the Switch 12
Attaching Brackets to the Catalyst 3750G-24TS Switch 14
Attaching Brackets to the Catalyst 3750G Integrated Wireless LAN Controller Switches 17
Attaching Brackets to All Other Catalyst 3750 Switches 18
Mounting the Switch in a Rack 24
Attaching the Cable Guide 26
Wall-Mounting 27
Attaching the Brackets to the Switch for Wall-Mounting 28
Attaching the RPS Connector Cover 28
Mounting the Switch on a Wall 29
Table- or Shelf-Mounting 30
Connecting StackWise Cable to StackWise Ports 30
Installing and Removing SFP Modules 33
Installing SFP Modules into SFP Module Slots 33
Removing SFP Modules from SFP Module Slots 34
Installing and Removing XENPAK Modules (Catalyst 3750G-16TD Switch) 35
Installing a XENPAK Module 36
Removing a XENPAK Module 38
Connecting to the 10/100 and 10/100/1000 Ports 39
Connecting to an SFP Module 41
Connecting to a Fiber-Optic SFP Module 41
Connecting to 1000BASE-T SFP Modules 43
Connecting to a XENPAK Module 44
Where to Go Next 45
1
Troubleshooting 1

Diagnosing Problems 1
Verify Switch POST Results 2
Monitor Switch LEDs 2
Verify Switch Connections 2
Bad or Damaged Cable 2
Ethernet and Fiber Cables 2
Link Status 3
PoE Connections 3
Transceiver Module Port Issues 3
Port and Interface Settings 4
Ping the End Device 4
Spanning Tree Loops 4
Monitor Switch Performance 5
Speed, Duplex, and Autonegotiation 5
Autonegotiation and NIC Cards 5
Cabling Distance 5
Clearing the Switch IP Address and Configuration 6
Replacing a Failed Stack Member 6
Finding the Switch Serial Number 7
1
Technical Specifications 1
1
Connector and Cable Specifications 1
Connector Specifications 1
10/100 and 10/100/1000 Ports 2
100BASE-FX Ports 2
SFP Module Ports 3
XENPAK Module Ports (Catalyst 3750G-16TD Switch) 4
Console Port 4
Cable and Adapter Specifications 5
SFP Module Cable Specifications 5
Two Twisted-Pair Cable Pinouts 6
Four Twisted-Pair Cable Pinouts for 10/100 Ports 7
Identifying a Crossover Cable 8
Four Twisted-Pair Cable Pinouts for 1000BASE-T Ports 8
Crossover Cable and Adapter Pinouts 9
1
Connecting to DC Power 1
Connecting to DC Power 1
Preparing for Installation 1
Grounding the Switch 2
Wiring the DC-Input Power Source 4
1

Configuring the Switch with the CLI-Based Setup Program 1
Accessing the CLI 2
Accessing the CLI Through Express Setup 2
Accessing the CLI Through the Console Port 2
Taking Out What You Need 3
Stacking the Switches (Optional) 4
Connecting to the Console Port 5
Starting the Terminal Emulation Software 6
Connecting to a Power Source 6
Entering the Initial Configuration Information 7
IP Settings 7
Completing the Setup Program 7

Audience

Purpose

Preface

This guide is for the networking or computer technician responsible for installing the Catalyst 3750
switches. We assume that you are familiar with the concepts and terminology of Ethernet and local area
networking.

This guide documents the hardware features of the Catalyst 3750 family of switches. It describes the
physical and performance characteristics of each switch, explains how to install a switch, and provides
troubleshooting information.

This guide does not describe system messages that you might receive or how to configure your switch.
For more information, see the switch software configuration guide, the switch command reference, and
the switch system message guide on the Cisco.com Product Documentation home page. For information
about the standard Cisco IOS Release 12.1 or 12.2 commands, see the Cisco IOS documentation set from
the Cisco.com home page by choosing Support > Documentation > Product and Support
Documentation/Cisco IOS Software.

Conventions

This document uses these conventions and symbols for notes, cautions, and warnings:

Note Means reader take note. Notes contain helpful suggestions or references to materials not contained in

this manual.

Caution Means reader be careful. In this situation, you might do something that could result in equipment

damage or loss of data.

OL-6336-10

Catalyst 3750 Switch Hardware Installation Guide

vii

Related Publications

Preface

Warning

IMPORTANT SAFETY INSTRUCTIONS

This warning symbol means danger. You are in a situation that could cause bodily injury. Before you
work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar
with standard practices for preventing accidents. Use the statement number provided at the end of
each warning to locate its translation in the translated safety warnings that accompanied this
device.

SAVE THESE INSTRUCTIONS

Statement 1071

The safety warnings for this product are translated into several languages in the Regulatory Compliance
and Safety Information for the Catalyst 3750 Switch guide. The EMC regulatory statements are also

included in that guide.

Related Publications

These documents provide complete information about the switch and are available from this
Cisco.com site:

http://www.cisco.com/en/US/products/hw/switches/ps5023/tsd_products_support_series_home.html

• Catalyst 3750 Switch Getting Started Guide

• Catalyst 3750G Integrated Wireless LAN Controller Getting Started Guide

• Regulatory Compliance and Safety Information for the Catalyst 3750 Switch

• Release Notes for the Catalyst 3750 Switch

• Release Notes for the Catalyst 3750G Integrated Wireless LAN Controller Switch

Note Before installing, configuring, or upgrading the switch, see the release notes on Cisco.com for the latest

information.

• Catalyst 3750 Switch Software Configuration Guide

• Catalyst 3750 Switch Command Reference

• Catalyst 3750, 3560, 3550, 2970, and 2960 Switch System Message Guide

• Device manager online help (available on the switch)

• Cisco RPS 2300 Redundant Power System Hardware Installation Guide

• Cisco RPS 675 Redundant Power System Hardware Installation Guide

• Getting Started with Cisco Network Assistant

• Cisco Small Form-Factor Pluggable Modules Installation Notes

viii

Catalyst 3750 Switch Hardware Installation Guide

OL-6336-10

Preface

Obtaining Documentation, Obtaining Support, and Security Guidelines

These compatibility matrix documents are available from this Cisco.com site:

http://www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_tables_list.html

• Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix

• Cisco 100-Megabit Ethernet SFP Modules Compatibility Matrix

• Cisco CWDM SFP Transceiver Compatibility Matrix

• Cisco Small Form-Factor Pluggable Modules Compatibility Matrix

• Compatibility Matrix for 1000BASE-T Small Form-Factor Pluggable Modules

Obtaining Documentation, Obtaining Support, and Security
Guidelines

For information on obtaining documentation, obtaining support, providing documentation feedback,
security guidelines, and also recommended aliases and general Cisco documents, see the monthly
What's New in Cisco Product Documentation, which also lists all new and revised Cisco technical
documentation, at this URL:

http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html

OL-6336-10

Catalyst 3750 Switch Hardware Installation Guide

ix

Obtaining Documentation, Obtaining Support, and Security Guidelines

Preface

Catalyst 3750 Switch Hardware Installation Guide

x

OL-6336-10

Features

CHA P T ER

1

Product Overview

The Catalyst 3750 family of switches—also referred to as the switches—are stackable Ethernet switches
to which you can connect devices like Cisco IP Phones, Cisco Wireless Access Points workstations, and
other network devices such as servers, routers, and other switches. This chapter provides a functional
overview of the Catalyst 3750 switch models. These topics are included:

• Features, page 1-1

• Front Panel Description, page 1-3

• Rear Panel Description, page 1-21

• Management Options, page 1-26

The switches can be deployed as backbone switches, aggregating 10BASE-T, 100BASE-TX, and
1000BASE-T Ethernet traffic from other network devices. See the switch software configuration guide
for examples that show how you might deploy the switches in your network.

OL-6336-10

Figure 1-3 through Figure 1-15 show the Catalyst 3750 switches.

These are the switch features:

• Fast Ethernet Configurations

–

Catalyst 3750-24FS switch—24 100BASE-FX ports and 2 small form-factor pluggable (SFP)
module slots

–

Catalyst 3750-24TS switch—24 10/100 Ethernet ports and 2 SFP module slots

–

Catalyst 3750-48TS switch—48 10/100 Ethernet ports and 4 SFP module slots

–

Catalyst 3750-24PS switch—24 10/100 Power over Ethernet (PoE) ports and 2 SFP module
slots

–

Catalyst 3750-48PS switch—48 10/100 PoE ports and 4 SFP module slots

–

Catalyst 3750V2-24FS switch—24 SFP module slots (downlink) and 2 SFP module slots
(uplink)

–

Catalyst 3750V2-24TS switch—24 10/100 Ethernet ports and 2 SFP module slots

–

Catalyst 3750V2-48TS switch—48 10/100 Ethernet ports and 4 SFP module slots

–

Catalyst 3750V2-24PS switch—24 10/100 PoE ports and 2 SFP module slots

–

Catalyst 3750V2-48PS switch—48 10/100 PoE ports and 4 SFP module slots

Catalyst 3750 Switch Hardware Installation Guide

1-1

Features

• Gigabit Ethernet Configurations

–

Catalyst 3750G-12S switch—12 SFP module slots

–

Catalyst 3750G-12S-SD switch—12 SFP module slots

–

Catalyst 3750G-24T switch—24 10/100/1000 Ethernet ports

–

Catalyst 3750G-24TS switch—1.5 rack units (RU)—24 10/100/1000 Ethernet ports and 4 SFP
module slots

–

Catalyst 3750G-24TS-1U switch—1 RU—24 10/100/1000 Ethernet ports and 4 SFP
module slots

–

Catalyst 3750G-48TS switch—48 10/100/1000 Ethernet ports and 4 SFP module slots

–

Catalyst 3750G-24PS switch—24 10/100/1000 PoE ports and 4 SFP module slots

–

Catalyst 3750G-48PS switch—48 10/100/1000 PoE ports and 4 SFP module slots

–

Catalyst 3750G-24WS-S25 switch—24 10/100/1000 PoE ports, 2 SFP module slots, and an
integrated Cisco wireless LAN controller supporting up to 25 Cisco Lightweight Access Points

–

Catalyst 3750G-24WS-S50 switch—24 10/100/1000 PoE ports, 2 SFP module slots, and an
integrated Cisco wireless LAN controller supporting up to 50 Cisco Lightweight Access Points

Chapter 1 Product Overview

• 10-Gigabit Ethernet Configuration

–

Catalyst 3750G-16TD switch—16 10/100/1000 Ethernet ports and 1 10-Gigabit Ethernet
XENPAK module slot

Note The 10-Gigabit Ethernet XENPAK modules are referred to as 10-Gigabit Ethernet module

ports in the software documentation.

• The switches support these SFP modules:

–

100BASE-FX multimode fiber (MMF)

–

1000BASE-BX

–

1000BASE-LX

–

1000BASE-SX

–

1000BASE-ZX

–

1000BASE-T

–

Coarse wavelength-division multiplexing (CWDM)

Note When you install 1000BASE-T SFP modules in Catalyst 3750 switches, they can operate either

at 10, 100, or 1000 Mb/s in full-duplex mode or at 10 or 100 Mb/s in half-duplex mode.

1-2

• For a list of the XENPAK modules that the Catalyst 3750G-16TD switch supports, see Tab l e B - 2 on

page B-4.

• Configuration

–

For 10/100 ports, autonegotiates the speed and duplex settings

–

For 10/100/1000 ports, autonegotiates the speed and supports only full-duplex mode

Catalyst 3750 Switch Hardware Installation Guide

OL-6336-10

Chapter 1 Product Overview

132240

2

Catalyst 35

60

SERIES

SYST

RPS

STAT

DUPLX

SPEED

STACK

MODE

1

1

2

1

3

2

4

5

6

7

8

17

19

18

20

21

22

23

24

9

11

10

12

13

14

15

16

MASTR

Note You can configure duplex mode to half, full, or autonegotiate on Gigabit Ethernet interfaces

if the speed is set to 10 or 100 Mb/s. You cannot configure half-duplex mode on Gigabit
Ethernet interfaces if the interface speed is 1000 Mb/s.

• The Catalyst 3750 switches support stacking. You can stack up to nine switches in a stack by cabling

the StackWise ports. StackWise ports are not user-configurable.

• Switches are hot-swappable.

• Connection for an optional Cisco RPS 2300 or Cisco RPS 675 redundant power system (RPS) that

operates on AC input and supplies backup DC power output to the Catalyst 3750 switches. The
Catalyst 3750G-12S-SD switch does not support an RPS.

Front Panel Description

These sections describe the Fast Ethernet and Gigabit Ethernet switches:

• Fast Ethernet Switches, page 1-3

• Gigabit Ethernet Switches, page 1-6

• 10/100 and 10/100/1000 Ports, page 1-10

Front Panel Description

• SFP Module Slots, page 1-12

• XENPAK Module Slot (Catalyst 3750G-16TD Switch), page 1-13

• LEDs, page 1-13

Fast Ethernet Switches

Catalyst 3750-24FS and 3750V2-24FS Switch Front Panel

The 100BASE-FX ports on the Catalyst 3750-24FS switch are numbered 1 through 24, as shown in

Figure 1-1. The SFP modules slots are numbered 1 (left) and 2 (right).

Figure 1-1 Catalyst 3750-24FS Switch

1 100BASE-FX ports 2 SFP module slots

OL-6336-10

Catalyst 3750 Switch Hardware Installation Guide

1-3

Front Panel Description

Catalyst 3750

SERIES

SYST

RPS

MASTR

STAT

DUPLX

SPEED

STACK

MODE

13X

14X

23X

24X

1X

2X

11X

12X

1

2

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

2

1

86541

Note The Catalyst 3750V2-24FS switch supports the 100BASE-FX multimode fiber (MMF) SFPs only in the

Chapter 1 Product Overview

The downlink SFP module slots on the Catalyst 3750V2-24FS switch are numbered 1 through 24.
The slots are grouped in pairs. The first member of the pair (slots 1) is above the second member
(slots 2), as shown in Figure 1-2.

downlink SFP module slots.

The uplink SFP modules slots are numbered 1 (left) and 2 (right).

Figure 1-2 Catalyst 3750V2-24FS Switch

279984

1

2

1 SFP module slots (downlink) 2 SFP module slots (uplink)

Catalyst 3750-24TS and 3750V2-24TS Switch Front Panel

The 10/100 ports on the switch are numbered 1 through 24. The ports are grouped in pairs. The first
member of the pair (port 1) is above the second member (port 2), as shown in Figure 1-3. Port 3 is above
port 4, and so on. The SFP module slots are numbered 1 (left) and 2 (right).

Figure 1-3 Catalyst 3750-24TS and 3750V2-24TS Switch

1 10/100 ports 2 SFP module slots

1-4

Catalyst 3750 Switch Hardware Installation Guide

OL-6336-10

Chapter 1 Product Overview

Catalyst 3750

SERIES

SYST

RPS

MASTR

STAT

DUPLX

SPEED

STACK

MODE

1X

2X

17X

18X

33X

34X

15X

16X

31X

32X

47X

48X

1

3

2

4

1

2

3

4

5

6

7

8

9

10

11

12

13

14

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

15

16

2

1

86542

104577

2

Catalyst 3

750

SERIES

SYST

RPS

STAT

DUPLX

SPEED

PoE

MODE

1

1

2

3

4

5

6

7

8

9

10

11

12

14

15

16

17

18

19

20

21

22

23

24

13

1

2

1X

2X

11X

12X

13X

14X

23X

24X

Catalyst 3750-48TS and 3750V2-48TS Switch Front Panel

The 10/100 ports on the switch are numbered 1 through 48. The ports are grouped in pairs. The first
member of the pair (port 1) is above the second member (port 2), as shown in Figure 1-4. Port 3 is above
port 4, and so on. The SFP module slots are numbered 1 to 4.

Figure 1-4 Catalyst 3750-48TS and 3750V2-48TS Switch

Front Panel Description

1 10/100 ports 2 SFP module slots

Catalyst 3750-24PS and 3750V2-24PS Switch Front Panel

The 10/100 PoE ports on the switch are grouped in pairs. The first member of the pair (port 1) is above
the second member (port 2), as shown in Figure 1-5. Port 3 is above port 4, and so on. The SFP module
slots are numbered 1 and 2.

Figure 1-5 Catalyst 3750-24PS and 3750V2-24PS Switch

1 10/100 PoE ports 2 SFP module slots

OL-6336-10

Catalyst 3750 Switch Hardware Installation Guide

1-5

Front Panel Description

104576

2

1

Catalyst 37

50

SERIES

SYST

RPS

STAT

DUPLX

SPEED

PoE

MODE

1

2

5

6

7

8

9

10

11

12

13

14

15

16

3

4

1X

2X

15X

16X

17

18

21

22

23

24

25

26

27

28

29 30

31

32

19

20

17X

18X

31X

32X

33

34

37

38

39

40

41

42

43

44

45 46

47

48

35

36

33X

34X

47X

48X

1

2

3

4

Catalyst 3750

SERIES

SYST

RPS

MASTR

STAT

DUPLX

SPEED

STACK

MODE

4

1

2

3

12

9

10

11

8

5

6

7

1

97166

Catalyst 3750-48PS and 3750V2-48PS Switch Front Panel

The 10/100 PoE ports on the switch are grouped in pairs. The first member of the pair (port 1) is above
the second member (port 2), as shown in Figure 1-6. Port 3 is above port 4, and so on. The SFP module
slots are numbered 1 to 4.

Figure 1-6 Catalyst 3750-48PS and 3750V248-PS Switch

1 10/100 PoE ports 2 SFP module slots

Chapter 1 Product Overview

Gigabit Ethernet Switches

Catalyst 3750G-12S and Catalyst 3750G-12S-SD Switch Front Panel

The SFP module slots on the switch are numbered 1 through 12. The slots are grouped in three sets of
four, as shown in Figure 1-7.

Figure 1-7 Catalyst 3750G-12S and 3750G-12S-SD Switch

1 SFP module slots

Catalyst 3750-24T, 3750G-24TS, and 3750G-24TS-1U Switch Front Panel

The 10/100/1000 ports on switch are grouped in pairs. The first member of the pair (port 1) is above the
second member (port 2), as shown in Figure 1-8, Figure 1-9, and Figure 1-10. Port 3 is above port 4, and
so on.

The SFP module slots are numbered 25 to 28 on the Catalyst 3750G-24TS Switch (Figure 1-9) and on

Catalyst 3750 Switch Hardware Installation Guide

1-6

the Catalyst 3750G-24TS-1U Switch (Figure 1-10).

OL-6336-10

Chapter 1 Product Overview

Catalyst 3750

SERIES

SYST

RPS

MASTR

STAT

DUPLX

SPEED

STACK

MODE

13X

14X

23X

24X

1X

2X

11X

12X

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

1

86543

Catalyst 3750

SERIES

SYST

RPS

MASTR

STAT

DUPLX

SPEED

STACK

MODE

13X

14X

23X

24X

1X

2X

11X

12X

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

1

2

86544

119768

2

Catalyst 3750

SERIES

MODE

1

1

2

3

4

5

6

7

8

9

10

11

12

14

15

16

17

18

19

20

21

22

23

24

13

1X

2X

11X

12X

13X

14X

23X

24X

RPS

STAT

DUPLX

SPEED

MASTR

STACK

SYST

25

26

27

28

Figure 1-8 Catalyst 3750G-24T Switch

1 10/100/1000 ports

Figure 1-9 Catalyst 3750G-24TS Switch

Front Panel Description

1 10/100/1000 ports 2 SFP module slots

Figure 1-10 Catalyst 3750G-24TS-1U Switch

1 10/100/1000 ports 2 SFP module slots

OL-6336-10

Catalyst 3750 Switch Hardware Installation Guide

1-7

Front Panel Description

119770

2

1

Catalyst 3750G

SERIES

SYST

RPS

STAT

DUPLX

SPEED

MODE

1

2

5

6

7 8

9

10

11

12

13

14

15

16

3

4

1X

2X

15X

16X

17

18

21

22

23

24

25

26

27

28

29

30

31

32

19

20

17X

18X

31X

32X

33

34

37

38

39

40

41

42

43

44

45

46

47

48

35

36

33X

34X

47X

48X

49

50

51

52

MASTR

STACK

119769

2

Catalyst 3750G

SERIES

PoE-24

MODE

1

1

2

3

4

5

6

7

8

9

10

11

12

14

15

16

17

18

19

20

21

22

23

24

13

1X

2X

11X

12X

13X

14X

23X

24X

RPS

STAT

DUPLX

SPEED

PoE

MASTR

STACK

SYST

25

26

27

28

Catalyst 3750G-48TS Switch Front Panel

The 10/100/1000 ports on the switch are numbered 1 through 48 and grouped in pairs. The first member
of the pair (port 1) is above the second member (port 2), as shown in Figure 1-11. Port 3 is above port 4,
and so on. The SFP module slots are numbered 49 to 52.

Figure 1-11 Catalyst 3750G-48TS Switch

Chapter 1 Product Overview

1 10/100/1000 ports 2 SFP module slots

Catalyst 3750G-24PS Switch Front Panel

The 10/100/1000 PoE ports on the switch are grouped in pairs. The first member of the pair (port 1) is
above the second member (port 2), as shown in Figure 1-12. Port 3 is above port 4, and so on. The SFP
module slots are numbered 25 to 28.

Figure 1-12 Catalyst 3750G-24PS Switch

1 10/100/1000 PoE ports 2 SFP module slots

1-8

Catalyst 3750 Switch Hardware Installation Guide

OL-6336-10

Chapter 1 Product Overview

119771

2

1

Catalyst 37

50G

SERIES

PoE-48

SYST

RPS

STAT

DUPLX

SPEED

PoE

MODE

1

2

5

6

7 8

9

10

11

12

13

14

15

16

3

4

1X

2X

15X

16X

17

18

21

22

23

24

25

26

27

28

29

30

31

32

19

20

17X

18X

31X

32X

33

34

37

38

39

40

41

42

43

44

45

46

47

48

35

36

33X

34X

47X

48X

49

50

51

52

MASTR

STACK

SYST

RPS

MASTR

STAT

DUPLX

SPEED

STACK

MODE

Catalyst 3750

series

104572

2

1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

1X

2X

15X

16X

TX

RX

1

Catalyst 3750G-48PS Switch Front Panel

The 10/100/1000 PoE ports on the switch are grouped in pairs. The first member of the pair (port 1) is
above the second member (port 2), as shown in Figure 1-13. Port 3 is above port 4, and so on. The SFP
module slots are numbered 49 to 52.

Figure 1-13 Catalyst 3750G-48PS Switch

Front Panel Description

1 10/100/1000 PoE ports 2 SFP module slots

Catalyst 3750G-16TD Switch Front Panel

The 10/100/1000 ports on the switch are grouped in pairs. The first member of the pair (port 1) is above
the second member (port 2), as shown in Figure 1-14. Port 3 is above port 4, and so on. The XENPAK
module slot is numbered 1.

Note The 10-Gigabit Ethernet XENPAK modules are referred to as 10-Gigabit Ethernet module ports in the

software documentation.

Figure 1-14 Catalyst 3750G-16TD Switch

1 10/100/1000 ports 2 XENPAK module slot

OL-6336-10

Catalyst 3750 Switch Hardware Installation Guide

1-9

10/100 and 10/100/1000 Ports

Catalyst 3750G

SERIES

PoE-24

Wireless LAN Controller

SYST
RPS
MASTR
STAT
DUPLX
SPEED
STACK
PoE

1X

2X

11X

12X

1

2

3

4

5

6

7

8

9

10

11

12

13X

14X

23X

24X

13

14

15

16

17

18

19

20

21

22

23

24

25

141726

2

1

Catalyst 3750G Integrated Wireless LAN Controller Switch Front Panel

The Catalyst 3750G Integrated Wireless LAN Controller switches have an integrated Cisco wireless
LAN controller. Depending on the switch model, the integrated wireless controller can support up to 25
or 50 Cisco Lightweight Access Points. The 10/100/1000 PoE ports switch are numbered 1 through 24
and grouped in pairs. The first member of the pair (port 1) is above the second member (port 2), as shown
in Figure 1-15. Port 3 is above port 4, and so on. The SFP module slots are numbered 25 and 26. The
switch also has two internal Gigabit Ethernet ports that connect the switch and the controller. The
internal ports are numbered as ports 27 and 28 and are not visible on the front panel.

Figure 1-15 Catalyst 3750G-24WS-S25 and 3750G-24WS-S50 Switch

Chapter 1 Product Overview

1 10/100/1000 PoE ports 2 SFP module slots

10/100 and 10/100/1000 Ports

You can set the 10/100 ports on the switch to operate in any combination of half duplex, full duplex,
10 Mb/s, or 100 Mb/s. You can set the 10/100/1000 ports to operate in 10 or 100 Mb/s in half or full
duplex, or in 1000 Mb/s in full duplex.

You can set both the 10/100 and the 10/100/1000 ports for speed and duplex autonegotiation, in
compliance with IEEE 802.3AB. (The default setting is autonegotiate.)

Note You can configure duplex mode to half, full, or autonegotiate on Gigabit Ethernet interfaces if the speed

is set to 10 or 100 Mb/s. You cannot configure half-duplex mode on Gigabit Ethernet interfaces if the
interface speed is 1000 Mb/s.

When set for autonegotiation, the port senses the speed and duplex settings of the attached device and
advertises its own capabilities. If the connected device also supports autonegotiation, the switch port
negotiates the best connection (the fastest line speed that both devices support and full-duplex
transmission if the attached device supports it) and configures itself accordingly. In all cases, the
attached device must be within 328 feet (100 meters).

The 10/100 or the 10/100/1000 PoE ports on the switch provide PoE support for devices that are
compliant with IEEE 802.3af. They also provide Cisco pre-standard PoE support for Cisco IP Phones
and Cisco Aironet Access Points.

Catalyst 3750 Switch Hardware Installation Guide

1-10

OL-6336-10

Chapter 1 Product Overview

On 24-port switches, the ports can deliver up to 15.4 W of PoE. On the 48-port switches, any 24 of the
48 ports can deliver 15.4 W of PoE, or any combination of the ports can deliver an average of 7.7 W of
PoE at the same time, up to a maximum switch power output of 370 W.

Each of the Catalyst 3750G-24WS-S25 and 3750G-24WS-S50 switch PoE ports can deliver up to

15.4 W of PoE.

On a per-port basis, you can control whether a Catalyst 3750 PoE port automatically provides power
when an IP phone or an access point is connected. The device manager and the CLI provide two PoE
settings for each 10/100 or 10/100/1000 PoE port: Auto (the default) and Never.

• When you select Auto, the port only provides power if a valid powered device, such as an

• When you select Never, the port does not provide power even if a Cisco IP phone or an access point

Cisco enhanced power negotiation allows some powered devices, such as the Cisco 7970G IP Phone, to
operate in high-power mode on Catalyst 3750 PoE switches. The powered device and the switch
negotiate through power-negotiation Cisco Discovery Protocol (CDP) messages for an agreed-upon
power-consumption level. The negotiation allows a high-power Cisco powered device that consumes
more than 7 W to operate at its highest power mode. The powered device first boots up in low-power
mode, consumes less than 7 W, and negotiates to obtain enough power to operate in high-power mode.
The device changes to high-power mode only when it receives confirmation from the switch. High-power
devices can operate in low-power mode on switches that do not support power-negotiation CDP.

For information about configuring and monitoring PoE ports, see the device manager online help and the
switch software configuration guide.

10/100 and 10/100/1000 Ports

IEEE 802.3af-compliant powered device, a Cisco pre-standard IP phone, or a Cisco pre-standard
Cisco access point, is connected to it.

is connected to it. For information about configuring and monitoring PoE ports, see the device
manager online help and the switch software configuration guide.

Note You also can connect a Cisco IP Phone or Cisco Aironet Access Point to a Catalyst 3750 PoE switch

10/100 or 10/100/1000 port and to an AC power source for redundant power. The powered device might
change to the AC power source as its primary power source when connected to it. In that case, the PoE
port becomes the backup power source for the powered device.

If the primary source fails, the second power source becomes the primary power source to the powered
device. During the power transfer, an IP Phone might reboot or reestablish link with the switch.

For information about Cisco IP Phones and Cisco Aironet Access Points, see the documentation that
came with your IP phone or access point.

Note 100BASE-TX and 1000BASE-T traffic requires a Category 5 or later cable. 10BASE-T traffic can use

Category 3 or Category 4 cables.

When you connect the switch to workstations, servers, routers, and Cisco IP Phones, be sure that the
cable is a straight-through cable. When you connect the switch to switches or hubs, use a crossover cable.
When using a straight-through or crossover cable for 1000BASE-T connections, be sure to use a twisted
four-pair, Category 5 or later cable for proper operation. Pinouts for the cables are described in

Appendix A, “Technical Specifications.”

OL-6336-10

Catalyst 3750 Switch Hardware Installation Guide

1-11

10/100 and 10/100/1000 Ports

You can use the mdix auto interface configuration command in the CLI to enable the automatic
medium-dependent interface crossover (auto-MDIX) feature. When you enable the auto-MDIX feature,
the switch detects the required cable type for copper Ethernet connections and configures the interfaces
accordingly. Therefore, you can use either a crossover or a straight-through cable for connections to a
copper 10/100, 10/100/1000, or 1000BASE-T SFP module port on the switch, no matter what type of
device is on the other end of the connection.

The auto-MDIX feature is enabled by default on switches running Cisco IOS Release 12.2(18)SE or
later. For releases between Cisco IOS Release 12.1(14)EA1 and 12.2(18)SE, the auto-MDIX feature is
disabled by default. For configuration information for this feature, see the switch software configuration
guide or the switch command reference.

Many legacy powered devices, including older Cisco IP phones and access points that do not fully
support IEEE 802.3af, might not support PoE when connected to the switches by a crossover cable.

100BASE-FX Ports

The 100BASE-FX ports use 50/125- or 62.5/125-micron multimode fiber-optic cabling. In full-duplex
mode, the cable length from a switch to an attached device cannot exceed 6,562 feet (2 kilometers).

The 100BASE-FX ports operate only at 100 Mb/s in either full- or half-duplex mode and do not support
autonegotiation. The half-duplex mode is the default setting.

You can connect a 100BASE-FX port to an SC or ST port on a target device by using one of the
MT-RJ fiber-optic patch cables that are listed in Table B-1 on page B-3.

Chapter 1 Product Overview

SFP Module Slots

Catalyst 3750 switches with SFP module slots support these SFP modules:

• 100BASE-FX (MMF)

Note The Catalyst 3750V2-24FS switch supports the 100BASE-FX multimode fiber (MMF) SFPs

• 1000BASE-BX

• 1000BASE-LX

• 1000BASE-SX

• 1000BASE-ZX

• 1000BASE-T

• CWDM

For a list of the SFP modules that the switches support, see the Catalyst 3750 switch release notes.

only in the downlink SFP module slots.

1-12

Catalyst 3750 Switch Hardware Installation Guide

OL-6336-10

Chapter 1 Product Overview

SFP Modules

The Catalyst 3750 switch uses Gigabit Ethernet SFP modules to establish connections to other devices.
These transceiver modules are field-replaceable, providing the uplink interfaces when inserted in an SFP
module slot. You can use the SFP modules for Gigabit uplink connections to other switches. You use
fiber-optic cables with LC or MT-RJ connectors to connect to a fiber-optic SFP module. You use a
Category 5 or higher cable with RJ-45 connectors to connect to a copper SFP module.

For more information about these SFP modules, see your SFP module documentation.

XENPAK Module Slot (Catalyst 3750G-16TD Switch)

The Catalyst 3750G-16TD switch uses 10-Gigabit Ethernet XENPAK modules to establish connections
to networks. You install the modules in the module slot in the switch front panel. See Table B-2 on

page B-4 for a list of XENPAK modules that the Catalyst 3750G-16TD switch supports.

Note The 10-Gigabit Ethernet XENPAK modules are referred to as 10-Gigabit Ethernet module ports in the

software documentation.

10/100 and 10/100/1000 Ports

LEDs

You can use the switch LEDs to monitor switch activity and its performance. Figure 1-16, Figure 1-17,
and Figure 1-18 show the switch LEDs and the Mode button that you use to select one of the port modes.

All LEDs are visible through the GUI management applications—the Network Assistant application for
multiple switches and the device manager GUI for a single switch. The switch software configuration
guide describes how to use the command-line interface (CLI) to configure and monitor individual
switches and switch clusters.

OL-6336-10

Catalyst 3750 Switch Hardware Installation Guide

1-13

10/100 and 10/100/1000 Ports

MODE

RPS

STAT

DUPLX

SPEED

MASTR

STACK

SYST

132966

21 3 4 6 7 85

RPS

SYST

MASTR

STAT

DUPLX

SPEED

STACK

PoE

MODE

2 3 4 5 7 81

6 9

104062

Figure 1-16 Switch LEDs (No PoE)

1 Mode button 5 Status LED

2 Stack LED 6 Master LED

3 Speed LED 7 RPS LED

4 Duplex LED 8 System LED

1. The RPS LED is not used on the Catalyst 3750G-12S-SD switch.

Chapter 1 Product Overview

1

Figure 1-17 Switch LEDs (PoE)

1 Mode button 6 Status LED

2 PoE LED 7 Master LED

3 Stack LED 8 RPS LED

4 Speed LED 9 System LED

5 Duplex LED

1-14

Catalyst 3750 Switch Hardware Installation Guide

OL-6336-10

Chapter 1 Product Overview

SYST
RPS
MASTR
STAT
DUPLX
SPEED
STACK
PoE

2 3 4 5 7 81

6 9

141727

Figure 1-18 Catalyst 3750G-24WS-S25 and 3750G-24WS-S50 Switch LEDs

10/100 and 10/100/1000 Ports

System LED

1 Mode button 6 Status LED

2 PoE LED 7 Master LED

3 Stack LED 8 RPS LED

4 Speed LED 9 System LED

5 Duplex LED

The System LED shows whether the system is receiving power and is functioning properly.

Table 1- 1 lists the LED colors and their meanings.

Table 1-1 System LED

Color System Status

Off System is not powered on.

Green System is operating normally.

Amber System is receiving power but is not functioning properly.

1

Alternating green and amber

1. Applies only to the Catalyst 3750G-24WS-S25 and 3750G-24WS-S50 switches.

Wireless controller is not functioning properly.

OL-6336-10

For information on the System LED colors during power-on self-test (POST), see the “Powering On the

Switch and Running POST” section on page 2-7.

Catalyst 3750 Switch Hardware Installation Guide

1-15

10/100 and 10/100/1000 Ports

RPS LED

Chapter 1 Product Overview

The RPS LED shows the RPS status. Tab le 1 -2 lists the LED colors and their meanings. The RPS LED
is not used on the Catalyst 3750G-12S-SD switch.

Table 1-2 RPS LED

Color RPS Status

Off RPS is off or not properly connected.

Green RPS is connected and ready to provide back-up power, if required.

Flashing green RPS is connected but is unavailable because it is providing power to another device

(redundancy has been allocated to a neighboring device).

Amber The RPS is in standby mode or in a fault condition. Press the Standby/Active button

on the RPS, and the LED should turn green. If it does not, the RPS fan could have
failed. Contact Cisco Systems.

Flashing amber The internal power supply in a switch has failed, and the RPS is providing power

to the switch (redundancy has been allocated to this device).

Master LED

For more information about the Cisco RPS 2300, see the Cisco Redundant Power System 2300 Hardware
Installation Guide. For more information about the Cisco RPS 675, see the Cisco RPS 675 Redundant
Power System Hardware Installation Guide. These guides are available on Cisco.com.

The Master LED shows the stack master status. Table 1- 2 lists the LED colors and their meanings.

Table 1-3 Master LED

Port Mode Description

Off Switch is not the stack master.

Green Switch is the stack master or a standalone switch.

Amber An error occurred when the switch was selecting the stack master switch or a stack error.

1-16

Catalyst 3750 Switch Hardware Installation Guide

OL-6336-10

Chapter 1 Product Overview

Port LEDs and Modes

Each RJ-45 port, SFP module slot, and XENPAK module slot has a port LED. These port LEDs, as a
group or individually, display information about the switch and about the individual ports. The port
modes determine the type of information that the port LEDs display. Table 1-4 lists the mode LEDs and
their associated port modes and meanings.

Table 1-4 Port Mode LEDs

Mode LED Port Mode Description

STAT Port status The port status. This is the default mode.

DUPLX Port duplex mode The port duplex mode: full duplex or half duplex.

SPEED Port speed The port operating speed: 10, 100, or 1000 Mb/s.

STACK Stack member status

PoE 10/100 and 10/100/1000

StackWise port status

PoE port power

10/100 and 10/100/1000 Ports

Note The 10/100/1000 ports operate only in full-duplex

mode.

The stack member status.

The StackWise port status. See the “Stack LED” section on

page 1-19 for more information.

The PoE status.

Table 1- 5 lists the PoE LED colors and their meanings.

Table 1-5 PoE Mode LED

Color PoE Status

Off PoE mode is not selected. None of the 10/100 or 10/100/1000 ports have been

denied power or are in a fault condition.

Green PoE mode is selected, and the PoE status is shown on the port LEDs.

Blinking amber PoE mode is not selected. At least one of the 10/100 or 10/100/1000 ports has been

denied power, or at least one of the 10/100 or 10/100/1000 ports has a PoE fault.

To select or change a mode, press the Mode button until the desired mode is highlighted. When you
change port modes, the meanings of the port LED colors also change. Ta ble 1-6 explains how to interpret
the port LED colors in different port modes.

OL-6336-10

Catalyst 3750 Switch Hardware Installation Guide

1-17

10/100 and 10/100/1000 Ports

Table 1-6 Meaning of LED Colors in Different Modes on the Switch

Port Mode Port LED Color Meaning

PoE

Chapter 1 Product Overview

1

Off PoE is off. If the powered device is receiving power from an AC

power source, the port LED is off even if the powered device is
connected to the switch port.

Green PoE is on. The port LED is green only when the switch port is

providing power.

Alternating
green and

PoE is denied because providing power to the powered device will
exceed the 370 W switch power capacity.

amber

Blinking amber PoE is off due to a fault.

Caution PoE faults are caused when noncompliant cabling or

powered devices are connected to a PoE port. Only
standard-compliant cabling can be used to connect Cisco
pre-standard IP Phones and wireless access points or
IEEE 802.3af-compliant devices to PoE ports. A cable or
device that causes a PoE fault must be removed from the
network.

STAT
(port status)

DUPLX
(duplex)

Amber PoE for the port has been disabled.

Note PoE is enabled by default.

Off No link, or port was administratively shut down.

Green Link present.

Blinking green Activity. Port is sending or receiving data.

Alternating
green-amber

Link fault. Error frames can affect connectivity, and errors such as
excessive collisions, cyclic redundancy check (CRC) errors, and
alignment and jabber errors are monitored for a link-fault
indication.

Amber Port is blocked by Spanning Tree Protocol (STP) and is not

forwarding data.

Note After a port is reconfigured, the port LED can remain amber

for up to 30 seconds as STP checks the switch for possible
loops.

Blinking amber Port is blocked by STP and is sending and receiving packets.

Off Port is operating in half duplex.

Green Port is operating in full duplex.

1-18

Catalyst 3750 Switch Hardware Installation Guide

OL-6336-10

Chapter 1 Product Overview

Table 1-6 Meaning of LED Colors in Different Modes on the Switch (continued)

Port Mode Port LED Color Meaning

SPEED

STACK
(stack member)

1. The PoE LED is only on the Catalyst 3750-24PS, 3750G-24PS, 3750-48PS, 3750G-48PS, 3750G-24WS-S25 and

10/100 and 10/100/1000 Ports

10/100 and 10/100/1000 ports

Off Port is operating at 10 Mb/s.

Green Port is operating at 100 Mb/s.

Blinking green Port is operating at 1000 Mb/s.

SFP module ports

Off Port is operating at 10 Mb/s.

Green Port is operating at 100 Mb/s.

Blinking green Port is operating at 1000 Mb/s.

Note When installed in Catalyst 3750 switches, 1000BASE-T

SFP modules can operate at 10, 100, or 1000 Mb/s in
full-duplex mode or at 10 or 100 Mb/s in half-duplex mode.

XENPAK port

Off Port is not operating.

Blinking green Port is operating at up to 10 Gb/s.

Off No stack member corresponding to that member number.

Blinking green Stack member number.

Green Member numbers of other stack member switches.

3750G-24WS-S50 switches.

Stack LED

If your switches are stacked and you press the Mode button on any one of the switches in the stack, all
the switches in the stack change to display the same selected mode. For example, if you press the mode
button on the stack master to display SPEED, all the other switches in the stack also display SPEED.

The PoE LED is on the Catalyst 3750-24PS, 3750G-24PS, 3750-48PS, 3750G-48PS, 3750G-24WS-S25
and 3750G-24WS-S50 switches. Even if PoE mode is not selected on the switches, this LED still shows
PoE problems if they are detected. The Catalyst 3750G-S-SD does not have a PoE LED.

The stack LED shows the sequence of member switches in a stack. Up to nine switches can be members
of a stack. The first nine port LEDs show the member number of a switch in a stack. Figure 1-19 shows
the LEDs on the first switch, which is stack member number 1. For example, if you press the Mode
button and select Stack, the LED for port 1 flashes green. The LEDs for port 2 and 3 are solid green, as
these represent the member numbers of other switches in the stack. The other port LEDs are off because
there are no more members in the stack.

OL-6336-10

Catalyst 3750 Switch Hardware Installation Guide

1-19

10/100 and 10/100/1000 Ports

Catalyst 3750

SERIES

SYST

RPS

MASTR

STAT

DUPLX

SPEED

STACK

MODE

1X

2X

17X

18X

33X

34X

15X

16X

31X

32X

47X

48X

1

2

3

4

1

2

3

4

5

6

7

8

9

10

11

12

13

14

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

15

16

Catalyst 3750

SERIES

SYST

RPS

MASTR

STAT

DUPLX

SPEED

STACK

MODE

1X

2X

17X

18X

33X

34X

15X

16X

31X

32X

47X

48X

1

2

3

4

1

2

3

4

5

6

7

8

9

10

11

12

13

14

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

15

16

Catalyst 3750

SERIES

SYST

RPS

MASTR

STAT

DUPLX

SPEED

STACK

MODE

1X

2X

17X

18X

33X

34X

15X

16X

31X

32X

47X

48X

1

2

3

4

1

2

3

4

5

6

7

8

9

10

11

12

13

14

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

15

16

1X

2X

1

2

3

4

5

6

7

8

9

10

11

12

13

1

2

3

132420

Figure 1-19 Stack LED

1 Stack member 1 3 Stack member 3

2 Stack member 2

Chapter 1 Product Overview

When you select the Stack LED, the representative Stack LEDs are green when the StackWise ports
(on the switch rear panel) are up, and the representative Stack LEDs are amber when the ports are down:

• SFP module port LEDs 1 and 2 on the Catalyst 3750-24TS and 3750V2-24TS switch show the status

for StackWise ports 1 and 2, respectively.

• SFP module port LEDs 3 and 4 on the Catalyst 3750-48TS and 3750V2-48TS switch show the status

for StackWise ports 1 and 2, respectively.

• SFP module port LEDs 51 and 52 on the Catalyst 3750G-48TS and 3750G-48PS switches show the

status for StackWise ports 1 and 2, respectively.

• SFP module port LEDs 27 and 28 on the Catalyst 3750G-24TS, 3750G-24TS-1U, and 3750G-24PS

switches show the status for StackWise ports 1 and 2, respectively.

• The 10/100/1000 port LEDs 23 and 24 on the Catalyst 3750G-24T switch show the status for

StackWise ports 1 and 2, respectively.

• SFP module port LEDs 11 and 12 on the Catalyst 3750G-12S and the Catalyst 3750G-12S-SD

switch show the status for StackWise ports 1 and 2, respectively.

• SFP module port LEDs 25 and 26 on the Catalyst 3750G-24WS-S25, and 3750G-24WS-S50

switches show the status for StackWise ports 1 and 2, respectively.

Note If the port LEDs are green on all the switches in the stack, the stack is operating at full bandwidth

Catalyst 3750 Switch Hardware Installation Guide

1-20

(32 Gb/s). If any of the port LEDs are not green, the stack is not operating at full bandwidth.

OL-6336-10