3COM 2900 User Manual

3Com Baseline Switch 2900 Family

Getting Started Guide

Manual Version: 5W100

www.3com.com

3Com Corporation

350 Campus Drive, Marlborough,

MA, USA 01752 3064

Copyright © 2009, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.

3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change.

3Com Corporation provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

If there is any software on removable media described in this documentation, it is furnished under a license agreement included with the product as a separate document, in the hard copy documentation, or on the removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.

UNITED STATES GOVERNMENT LEGEND

If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at private expense. Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995) or as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only such rights as are provided in 3Com’s standard commercial license for the Software. Technical data is provided with limited rights only as provided in DFAR 252.227-7015 (Nov 1995) or FAR 52.227-14 (June 1987), whichever is applicable. You agree not to remove or deface any portion of any legend provided on any licensed program or documentation contained in, or delivered to you in conjunction with, this User Guide.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not be registered in other countries.

3Com and the 3Com logo are registered trademarks of 3Com Corporation.

All other company and product names may be trademarks of the respective companies with which they are associated.

ENVIRONMENTAL STATEMENT

It is the policy of 3Com Corporation to be environmentally-friendly in all operations. To uphold our policy, we are committed to:

Establishing environmental performance standards that comply with national legislation and regulations. Conserving energy, materials and natural resources in all operations.

Reducing the waste generated by all operations. Ensuring that all waste conforms to recognized environmental standards. Maximizing the recyclable and reusable content of all products.

Ensuring that all products can be recycled, reused and disposed of safely.

Ensuring that all products are labelled according to recognized environmental standards. Improving our environmental record on a continual basis.

End of Life Statement

3Com processes allow for the recovery, reclamation and safe disposal of all end-of-life electronic components.

Regulated Materials Statement

3Com products do not contain any hazardous or ozone-depleting material.

Environmental Statement about the Documentation

The documentation for this product is printed on paper that comes from sustainable, managed forests; it is fully biodegradable and recyclable, and is completely chlorine-free. The varnish is environmentally-friendly, and the inks are vegetable-based with a low heavy-metal content.

About This Manual

Organization

3Com Baseline Switch 2900 Family Getting Started Guide is organized as follows:

		Chapter	Contents
			Briefly introduces the appearance, system description, as
	1	Product Overview	well as the features and applications of the 3Com Baseline
			Switch 2900 Family.
			Describes the requirements on installation site, the safety
	2	Installation Preparations	recommendations before and during installation, and the
			required tools.
			Covers the procedures for installing the 3Com Baseline
	3	Installing a Switch	Switch 2900 Family, ground wire connection, power
			module installation, interface module installation, and so
			on.
			Helps you get familiar with the basic knowledge of how to
	4	Initial Power-On	boot and configure the 3Com Baseline Switch 2900 Family,
			including device startup, power-on, and initialization of
			system files, and so on.
	5	Loading Software	Introduces how to load Boot ROM and host software for the
			3Com Baseline Switch 2900 Family
			Introduces the problems that might occur during the
	6	Maintenance and Troubleshooting	installation and the booting of the 3Com Baseline Switch
			2900 Family and the related solution.

Conventions

The manual uses the following conventions:

GUI conventions

	Convention	Description
	Boldface	Window names, button names, field names, and menu items are in
		Boldface. For example, the New User window appears; click OK.
	>	Multi-level menus are separated by angle brackets. For example, File >
		Create > Folder.

Symbols

Convention	Description

Means reader be extremely careful. Improper operation may cause bodily injury.

Means reader be careful. Improper operation may cause data loss or damage to equipment.

Means an action or information that needs special attention to ensure successful configuration or good performance.

Convention	Description

Means a complementary description.

Means techniques helpful for you to make configuration with ease.

Related Documentation

In addition to this manual, each 3Com Baseline Switch 2900 documentation set includes the following:

Manual	Description

Describe how to configure your 3Com Baseline 3Com Baseline Switch 2900 Family User Guide Switch 2900 Family using the supported

protocols

Obtaining Documentation

You can access the most up-to-date 3Com product documentation on the World Wide Web at this URL: http://www.3com.com.

Table of Contents

1Product Overview ······································································································································1-1

Introduction ·············································································································································1-1 3Com Baseline Switch 2920-SFP Plus···································································································1-3 Front Panel ······································································································································1-3 Rear Panel·······································································································································1-3 Power Supply System ·····················································································································1-3 Cooling System ·······························································································································1-3 3Com Baseline Switch 2928-SFP Plus···································································································1-4 Front Panel ······································································································································1-4 Rear Panel·······································································································································1-4 Power Supply System ·····················································································································1-4 Cooling System ·······························································································································1-4 3Com Baseline Switch 2952-SFP Plus···································································································1-5 Front Panel ······································································································································1-5 Rear Panel·······································································································································1-5 Power Supply System ·····················································································································1-5 Cooling System ·······························································································································1-5 3Com Baseline Switch 2928-PWR Plus ·································································································1-6 Front Panel ······································································································································1-6 Rear Panel·······································································································································1-6 Power Supply System ·····················································································································1-6 Cooling System ·······························································································································1-6 3Com Baseline Switch 2928-HPWR Plus·······························································································1-7 Front Panel ······································································································································1-7 Rear Panel·······································································································································1-7 Power Supply System ·····················································································································1-7 Cooling System ·······························································································································1-8 Ports························································································································································1-8 Console Port····································································································································1-8 10/100/1000Base-T Ethernet Port···································································································1-8 1000Base-X SFP Interface··············································································································1-9 LEDs······················································································································································1-10 Power LED ····································································································································1-10 RPS Status LED····························································································································1-10 Port Mode LED······························································································································1-11 10/100/1000Base-T Auto-Sensing Ethernet Port Status LED·······················································1-11 1000Base-X SFP Interface Status LED ························································································1-13

2Installation Preparations···························································································································2-1

Safety Precautions··································································································································2-1 Installation Site········································································································································2-1 Temperature/Humidity·····················································································································2-1 Cleanness········································································································································2-1 Electromagnetic Susceptibility·········································································································2-2

i

Laser Safety ····································································································································2-2 Installation Tools ·····································································································································2-3

3Installing a Switch ·····································································································································3-1

Installing the Switch into a 19-Inch Rack Using Mounting Brackets·······················································3-1 Introduction to Mounting Brackets···································································································3-1 Attaching the Mounting Brackets to a Switch··················································································3-2 Mounting the Switch to a Rack········································································································3-4 Mounting the Switch on a Workbench ····································································································3-6 Connecting the PGND Cable ··················································································································3-6 When a Grounding Strip is Available·······························································································3-6 Where a Grounding Conductor Can be Buried ···············································································3-8 In Other Installation Sites ················································································································3-8

Connecting the Power Cord····················································································································3-9 Connecting an AC Power Cord ·······································································································3-9 Connecting an RPS DC Power Cord·····························································································3-10 Verifying the Installation························································································································3-10

4Initial Power-On ·········································································································································4-1

Setting Up the Configuration Environment······························································································4-1 Connecting the Console Cable ···············································································································4-1 Console Cable ·································································································································4-1 Connection Procedure·····················································································································4-2 Setting Terminal Parameters ··················································································································4-2 Booting the Switch ··································································································································4-5 Checking Before Power-On·············································································································4-5 Powering On the Switch ··················································································································4-5 Changing the Boot Mode·················································································································4-7

5Loading Software·······································································································································5-1

Introduction ·············································································································································5-1 Approaches for Loading Application and Configuration Files·································································5-1 Loading Files Through the Boot ROM Menu ··························································································5-1 Introduction to the Boot ROM Menu································································································5-2 Loading Files Using XMODEM Through Console Port ···································································5-3 Loading Files Using TFTP Through Ethernet Port ········································································5-11 Loading Files Using FTP Through Ethernet Port ··········································································5-14

6Maintenance and Troubleshooting··········································································································6-1

File Loading Failure·································································································································6-1 Password Loss········································································································································6-1 User Password Loss························································································································6-1 Boot ROM Password Loss ··············································································································6-1 Power Supply Failure······························································································································6-2 Configuration Terminal Failure················································································································6-3

ii

1 Product Overview

Introduction

The 3Com Baseline Switch 2900 Family are Layer 2 Gigabit Ethernet switches developed by 3Com. They are intelligent manageable switches designed for network environments where high performance, high-density port distribution, and easy installation are required.

With 10/100/1000 Mbps Ethernet interfaces, the 3Com Baseline Switch 2900 Family are mainly deployed at the access layer in enterprise networks requiring Gigabit to the Desktop (GTTD) application and at the distribution layer in metropolitan-area networks (MANs). In the latter deployment, the 3Com Baseline Switch 2900 Family provide GE electrical interfaces for user access or low-end switch convergence in the downlink direction. Whereas, in the uplink direction, they are aggregated to large-capacity Layer 3 switches or switches at the exchange office through their GE interfaces.

Table 1-1 shows the models and system specifications of the 3Com Baseline Switch 2900 Family.

Table 1-1 The 3Com Baseline Switch 2900 Family system specifications

Description

3Com

3Com

3Com

3Com

3Com

Item

Baseline

Baseline

Baseline

Baseline

Baseline

Switch

Switch

Switch

Switch

Switch

2920-SFP

2928-SFP

2952-SFP

2928-PWR

2928-HPWR

Plus

Plus

Plus

Plus

Plus

Physical

43.6 × 440 ×

43.6 × 440 ×

43.6 × 440 ×

43.6 × 440 ×

43.6 × 440 ×

dimension

160 mm (1.72

160 mm (1.72

260 mm (1.72

420 mm (1.72

420 mm (1.72

s (H × W ×

× 17.32 × 6.30

× 17.32 × 6.30

× 17.32 ×

× 17.32 ×

× 17.32 ×

D)

in.)

in.)

10.24 in.)

16.54 in.)

16.54 in.)

Weight

ñ 3 kg (6.61 lb)

ñ 3 kg (6.61 lb)

ñ 5 kg (11.02

ñ 7 kg (15.43

ñ 7 kg (15.43

lb)

lb)

lb)

Console

1

1

1

1

1

port

16 ×

24 ×

48 ×

24 ×

24 ×

10/100/1000B

10/100/1000B

10/100/1000B

10/100/1000Ba

10/100/1000B

Service

ase-T

ase-T

ase-T

se-T

ase-T

autosensing

autosensing

autosensing

autosensing

autosensing

ports

Ethernet ports

Ethernet ports

Ethernet ports

Ethernet ports

Ethernet ports

+ 4 GE SFP

+ 4 GE SFP

+ 4 GE SFP

+ 4 GE SFP

+ 4 GE SFP

interfaces

interfaces

interfaces

interfaces

interfaces

1-1

Description

3Com

3Com

3Com

3Com

3Com

Item

Baseline

Baseline

Baseline

Baseline

Baseline

Switch

Switch

Switch

Switch

Switch

2920-SFP

2928-SFP

2952-SFP

2928-PWR

2928-HPWR

Plus

Plus

Plus

Plus

Plus

AC

Rated voltage range: 100 VAC to 240 VAC, 50 Hz or 60 Hz

Maximum voltage range: 90 VAC to 264 VAC, 47 Hz or 63 Hz

Inp

Use the

external RPS

ut

unit provided

volt

RP

by 3Com only,

ag

S

—

with the rated

e

DC

voltage

ranging from

–52 VDC to

–55 VDC

Supported

—

RPS1000-A3

RPS unit

Power

AC: 45.6W

consumpti

11.9W

13.4W

25.7W

25.0W

DC: 27.5W

on

AC power

input: 523 W

(158 W for

system power

255 W (85 W

consumption

Power

and 365 W for

for system

PoE power

consumpti

power

consumption)

on (full

22.4 W

31.5 W

55.4 W

consumption

DC power

configurati

and 170 W for

input: 832 W

on)

PoE power

(92 W for

consumption)

system power

consumption

and 740 W for

PoE power

consumption)

Operating

temperatu

0°C to 45°C (32°F to 113°F)

re

Operating

humidity

10% to 90%

(nonconde

nsing)

1-2

3Com Baseline Switch 2920-SFP Plus

Front Panel

Figure 1-1 3Com Baseline Switch 2920-SFP Plus front panel

	(1)	10/100/1000Base-T auto-sensing Ethernet port																									(2)				Port status LED
	(3)	Power LED (Power)																									(4)				Console port
	(5)	1000Base-X SFP interface

10/100/1000Base-T autosensing Ethernet ports on the 3Com Baseline Switch 2900 Family are numbered in up-down and left-right order, with the first upper left one being Port 1, the first lower left one being Port 2, the second upper left one being Port 3, and so on.

Rear Panel

Figure 1-2 3Com Baseline Switch 2920-SFP Plus rear panel

(1) AC receptacle

(2) Grounding screw

Power Supply System

AC power input:

Rated voltage range: 100 VAC to 240 VAC, 50 Hz or 60 Hz

Input voltage range: 90 VAC to 264 VAC, 47 Hz or 63 Hz

Cooling System

The 3Com Baseline Switch 2920-SFP Plus is equipped with one fan for heat dissipation

1-3

3Com Baseline Switch 2928-SFP Plus

Front Panel

Figure 1-3 3Com Baseline Switch 2928-SFP Plus front panel

(1)			10/100/1000Base-T auto-sensing Ethernet port																																			(2)				Port status LED
(3)			Power LED (Power)																																			(4)				Console port
(5)			1000Base-X SFP interface

Rear Panel

Figure 1-4 3Com Baseline Switch 2928-SFP Plus rear panel

(1) AC receptacle

(2) Grounding screw

Power Supply System

AC power input:

Rated voltage range: 100 VAC to 240 VAC, 50 Hz or 60 Hz

Input voltage range: 90 VAC to 264 VAC, 47 Hz or 63 Hz

Cooling System

The 3Com Baseline Switch 2928-SFP Plus is equipped with one fan for heat dissipation.

1-4

3Com Baseline Switch 2952-SFP Plus

Front Panel

Figure 1-5 3Com Baseline Switch 2952-SFP Plus front panel

(1)		10/100/1000Base-T auto-sensing Ethernet																														(2)			10/100/1000Base-T auto-sensing Ethernet
port																																	port status LED
(3)		Console port																														(4)			Power LED (Power)
(5)		1000Base-X SFP interface																														(6)			1000Base-X SFP interface status LED

Rear Panel

Figure 1-6 3Com Baseline Switch 2952-SFP Plus rear panel

(1) AC receptacle

(2) Grounding screw

Power Supply System

AC power input:

Rated voltage range: 100 VAC to 240 VAC, 50 Hz or 60 Hz

Input voltage range: 90 VAC to 264 VAC, 47 Hz or 63 Hz

Cooling System

The 3Com Baseline Switch 2952-SFP Plus is equipped with one fan for heat dissipation.

1-5

3Com Baseline Switch 2928-PWR Plus

Front Panel

Figure 1-7 3Com Baseline Switch 2928-PWR Plus front panel

(1)			10/100/1000Base-T auto-sensing Ethernet port																																				(2)		Port status LED mode switching button
(3)			Port status LED																																				(4)		Power LED (Power)
(5)			Port mode LED																																				(6) Console port Port
(7)			1000Base-X SFP interface

Rear Panel

Figure 1-8 3Com Baseline Switch 2928-PWR Plus rear panel

(1) AC receptacle

(2) Grounding screw

Power Supply System

AC power input:

Rated voltage range: 100 VAC to 240 VAC, 50 Hz or 60 Hz

Input voltage range: 90 VAC to 264 VAC, 47 Hz or 63 Hz

Cooling System

The 3Com Baseline Switch 2928-PWR Plus is equipped with three fans for heat dissipation.

1-6

3Com Baseline Switch 2928-HPWR Plus

Front Panel

Figure 1-9 3Com Baseline Switch 2928-HPWR Plus front panel

(1)		10/100/1000Base-T auto-sensing Ethernet port																								(2)				Port status LED mode switching button
(3)		RPS status LED (RPS)																								(4)				Port status LED
(5)		Power LED (Power)																								(6)				Port mode LED
(7)		Console port																									(8) Port 1000Base-X SFP interface

Rear Panel

Figure 1-10 3Com Baseline Switch 2928-HPWR Plus rear panel

(1)

Screw hole of the plug

(2) AC receptacle

(3)

Grounding screw

(4) DC power receptacle

Power Supply System

The 3Com Baseline Switch 2928-HPWR Plus can adopt AC power input, or DC power input, or both to provide backup

zAC power input:

Rated voltage range: 100 VAC to 240 VAC, 50 Hz or 60 Hz

Input voltage range: 90 VAC to 264 VAC, 47 Hz or 63 Hz

zDC power input

Rated voltage range: –52 VDC to –55 VDC

1-7

Only the RPS recommended by 3Com can be used for the 3Com Baseline Switch 2928-HPWR Plus. The –48 VDC power supply in the equipment room cannot be used directly. Otherwise, the device may be damaged.

Cooling System

The 3Com Baseline Switch 2928-HPWR Plus is equipped with six fans for heat dissipation.

Ports

Console Port

Each 3Com Baseline Switch 2900 Family provides one console port on the front panel. Table 1-2 describes the console port specifications.

Table 1-2 Console port specifications

	Item		Specification
	Connector type		RJ-45
	Compliant standard		EIA/TIA-232
	Transmission baud		9600 bps to 115200 bps (defaulting to 38400 bps)
	rate
	Service		z It can be connected to an ASCII terminal.
			z It can be connected to a serial port of a local or remote (through a pair of
			modems) PC running terminal emulation program.

10/100/1000Base-T Ethernet Port

Each 3Com Baseline Switch 2900 Family provides 10/100/1000Base-T Ethernet ports on its front panel. Quantity of Ethernet ports varies with the device model, see Table 1-1 for details.

Table 1-3 describes the specifications of the 10/100/1000Base-T Ethernet ports.

Table 1-3 3Com Baseline Switch 2900 Family 10/100/1000Base-T Ethernet port specifications

	Item		Specification
	Connector type		RJ-45
			z 10 Mbps, full duplex
	Interface speed and operating mode		z 100 Mbps, full duplex
			z 1000 Mbps, full duplex
			z MDI/MDI-X, auto-sensing
	Max transmission distance		100 m (328.1 ft.)
	Transmission medium		Category-5 unshielded twisted pair cable
	Standard		IEEE 802.3i, IEEE 802.3u, IEEE 802.3ab
		1-8

1000Base-X SFP Interface

Each 3Com Baseline Switch 2900 Family provides four 1000Base-X SFP interfaces on its front panel. You can select the GE SFP transceivers described in Table 1-4.

Table 1-4 Transceivers supported by the 3Com Baseline Switch 2900 Family 1000Base-X SFP

interfaces

	Transceiver		Transceiver		Central		Connector
	type				wavelength

SFP-GE-SX-MM850-A 850 nm

SFP-GE-LX-SM1310-A

1310 nm

LC

SFP-GE-LH40-SM1310

GE SFP	SFP-GE-LH40-SM1550
transceiver	SFP-GE-LH70-SM1550	1550 nm
	SFP-GE-LX-SM1310-B	TX: 1310 nm
		RX: 1490
	IDI*
		nm
			LC
	SFP-GE-LX-SM1490-B	TX: 1490 nm
		RX: 1310
	IDI*
		nm
	SFP-GE-T	—	RJ-45

Fiber

50/125 µm multimode optical fiber

62.5/125 µm multimode optical fiber

9/125 µm single mode optical fiber

9/125 µm single mode optical fiber

Twisted pair cable

Max transmis sion distance

550 m

(0.34

miles)

275 m

(0.17

miles)

10 km

(6.21

miles)

40 km

(24.86

miles)

40 km

(24.86

miles)

70 km

(43.50

miles)

10 km

(6.21

miles)

100 m

(328.08

ft)

Note* that SFP-GE-LX-SM1310-BIDI and SFP-GE-LX-SM1490-BIDI must be used pairwise.

The types of SFP transceivers may update with time. For information about transceivers, contact 3Com technical support or marketing staff.

1-9

LEDs

Table 1-5 LEDs

	LED		Device support		Description
	Power LED	All series			See “Power LED” on page 1-10.
	RPS status LED		3Com Baseline Switch		See “RPS Status LED” on page
			2928-HPWR Plus	1-10.
			3Com Baseline Switch
	Port mode LED		2928-PWR Plus and 3Com		See “Port Mode LED” on page 1-11.
			Baseline Switch 2928-HPWR
			Plus
	10/100/1000Base-T				See “10/100/1000Base-T
	auto-sensing Ethernet		All series		Auto-Sensing Ethernet Port Status
	port status LED			LED” on page 1-11
	1000Base-X SFP		All series		See “1000Base-X SFP Interface
	interface status LED			Status LED” on page1-13.

Power LED

The power LED indicates the operation status of the switch.

Table 1-6 Description of the power LED

		LED	Status	Description
			Solid green	The switch functions normally.
			Blinking green (1 Hz)	The system is performing power-on self test (POST) or
				downloading software.
		Power
			Blinking green (3 Hz)	The POST has failed or another fatal error has been
				detected.
			Off	The switch has been powered off.

RPS Status LED

The 3Com Baseline Switch 2928-HPWR Plus provides an RPS status LED on its front panel, indicating the working status of the RPS of the switch.

Table 1-7 Description of the RPS status LED

		LED	Status	Description
			Solid green	The RPS DC input is normal.
		RPS
			Off	The RPS unit is not connected or the RPS DC input is
				abnormal.

1-10

Port Mode LED

The port mode LED on the 3Com Baseline Switch 2928-PWR Plus/3Com Baseline Switch 2928-HPWR Plus can display the working status of a port for you to obtain more device information. You can use the port mode switching button to change the status of the port mode LED.

Table 1-8 3Com Baseline Switch 2928-PWR Plus/3Com Baseline Switch 2928-HPWR Plus port mode LED description

		LED		Status	Description
		Mode		Solid green	Indicates port rate.
				Blinking green (1 Hz)	Indicates port PoE power supply.

10/100/1000Base-T Auto-Sensing Ethernet Port Status LED

zEach port of the 3Com Baseline Switch 2952-SFP Plus has a bi-color LED indicating its status; whereas each port of other models of the 3Com Baseline Switch 2900 Family has two LEDs, with only one in the ON state at a time.

zFor each port of the 3Com Baseline Switch 2928-PWR Plus and 3Com Baseline Switch 2928-HPWR Plus, the port mode LED and the status LED together indicate the port operation status.

Table 1-9 10/100/1000Base-T auto-sensing Ethernet port LEDs description

Port

Ethernet port status

Switch model

mode

Meaning

LED

LED

On

The port operates at a rate of 1000

Mbps

Green

Fast blinking

Data is being transmitted or received at

1000 Mbps

3Com Baseline

Off

The port is not up or does not operate at

1000 Mbps

Switch

2920-SFP Plus

—

On

The port operates at a rate of 10/100

3Com Baseline

Mbps

Switch

Data is being transmitted or received at

2928-SFP Plus

Fast blinking

10/100 Mbps

Yellow

Blinking (3

The POST has failed

Hz)

Off

The port is not up or does not operate at

10/100 Mbps

1-11

Port

Ethernet port status

Switch model

mode

Meaning

LED

LED

Solid green

The port operates at a rate of 1000

Mbps

Fast blinking green

Data is transmitted or received at a rate

of 1000 Mbps

3Com Baseline

The port operates at a rate of 10/100

Switch

—

Solid yellow

Mbps

2952-SFP Plus

Fast blinking yellow

Data is transmitted or received at a rate

of 10/100 Mbps

Off

The port is not up or the POST has

failed

On

The port operates at a rate of 1000

Mbps

Green

Fast blinking

Data is transmitted or received at a rate

of 1000 Mbps

Off

The port is not up or does not operate at

1000 Mbps

Solid

green

On

The port operates at a rate of 10/100

(rate

Mbps

mode)

Fast blinking

Data is transmitted or received at a rate

of 10/100 Mbps

Yellow

Blinking (3

The POST has failed

3Com Baseline

Hz)

Switch

Off

The port is not up or does not operate at

2928-PWR Plus

10/100 Mbps.

3Com Baseline

On

PoE power supply is normal.

Switch

2928-HPWR

Power consumption of the device

Plus

Blinking at 3

attached to the port exceeds the upper

Green

limit of the power supply consumption of

Hz

the port, or the available power of the

switch is not enough for power supply of

Blinking

the port.

green

Off

No PoE power supply is provided on the

(PoE

port.

mode)

On

The device connected to the interface is

not a PD device or a PoE failure occurs

Yellow

Blinking (3

The POST has failed

Hz)

Off

No PoE power supply is provided on the

port or PoE power supply is normal.

1-12

1000Base-X SFP Interface Status LED

For 3Com Baseline Switch 2928-PWR Plus and 3Com Baseline Switch 2928-HPWR Plus, the port mode switching button does not take effect for the 1000Base-X SFP interface LEDs.

Table 1-10 1000Base-X SFP interface status LEDs description

	LED	Meaning
	Solid green	The port operates at a rate of 1000 Mbps
		The port is transmitting data at 1000 Mbps
	Blinking green	The LED is fast blinking when data is being received on the port.
	Off	No link is present on the port

1-13