3Com Baseline Switch 2928-PWR Plus, Baseline Switch 2920-SFP Plus, Baseline Switch 2900, Baseline Switch 2928-HPWR Plus, Baseline Switch 2952-SFP Plus Getting Started Manual

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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.

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About This Manual

Organization

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

Chapter Contents

1 Product Overview

2 Installation Preparations

3 Installing a Switch

4 Initial Power-On

Briefly introduces the appearance, system description, as well as the features and applications of the 3Com Baseline Switch 2900 Family.

Describes the requirements on installation site, the safety recommendations before and during installation, and the required tools.

Covers the procedures for installing the 3Com Baseline 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 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

6 Maintenance and Troubleshooting

Conventions

The manual uses the following conventions:

GUI conventions

Convention Description

Boldface

Introduces how to load Boot ROM and host software for the 3Com Baseline Switch 2900 Family

Introduces the problems that might occur during the installation and the booting of the 3Com Baseline Switch 2900 Family and the related solution.

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

Related Documentation

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

Manual Description

3Com Baseline Switch 2900 Family User Guide

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.

Means a complementary description.

Means techniques helpful for you to make configuration with ease.

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

Table of Contents

1 Product 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

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

Safety Precautions ··································································································································2-1 Installation Site········································································································································2-1

Temperature/Humidity·····················································································································2-1 Cleanness········································································································································2-1 Electromagnetic Susceptibility·········································································································2-2

Laser Safety ····································································································································2-2

Installation Tools ·····································································································································2-3

3 Installing 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

4 Initial 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

5 Loading 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

6 Maintenance 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

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

Item

Physical dimension s (H × W × D)

Weight

Console port

Service ports

3Com

Baseline

Switch

2920-SFP

Plus

43.6 × 440 × 160 mm (1.72 × 17.32 × 6.30 in.)

3 kg (6.61 lb) ñ 3 kg (6.61 lb)

1 1 1 1 1

16 × 10/100/1000B ase-T autosensing Ethernet ports + 4 GE SFP interfaces

3Com

Baseline

Switch

2928-SFP

Plus

43.6 × 440 × 160 mm (1.72 × 17.32 × 6.30 in.)

24 × 10/100/1000B ase-T autosensing Ethernet ports + 4 GE SFP interfaces

3Com

Baseline

Switch

2952-SFP

Plus

43.6 × 440 × 260 mm (1.72 × 17.32 ×

10.24 in.)

5 kg (11.02

lb)

48 × 10/100/1000B ase-T autosensing Ethernet ports + 4 GE SFP interfaces

3Com

Baseline

Switch

2928-PWR

Plus

43.6 × 440 × 420 mm (1.72 × 17.32 ×

16.54 in.)

7 kg (15.43

lb)

24 × 10/100/1000Ba se-T autosensing Ethernet ports + 4 GE SFP interfaces

3Com

Baseline

Switch

2928-HPWR

Plus

43.6 × 440 × 420 mm (1.72 × 17.32 ×

16.54 in.)

7 kg (15.43

lb)

24 × 10/100/1000B ase-T autosensing Ethernet ports + 4 GE SFP interfaces

1-1

Description

Item

Inp ut volt

Supported RPS unit

Power consumpti on

Power consumpti on (full configurati on)

3Com

Baseline

Switch

2920-SFP

Plus

3Com

Baseline

Switch

2928-SFP

Plus

3Com

Baseline

Switch

2952-SFP

Plus

3Com

Baseline

Switch

2928-PWR

Plus

3Com

Baseline

Switch

2928-HPWR

Plus

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

Use the external RPS unit provided by 3Com only,

—

with the rated voltage ranging from –52 VDC to –55 VDC

— RPS1000-A3

11.9W 13.4W 25.7W 25.0W

AC: 45.6W

DC: 27.5W

AC power input: 523 W (158 W for system power consumption and 365 W for PoE power consumption)

DC power input: 832 W (92 W for system power

22.4 W 31.5 W 55.4 W

255 W (85 W for system power consumption and 170 W for PoE power consumption)

consumption and 740 W for PoE power consumption)

Operating temperatu re

Operating humidity (nonconde nsing)

0°C to 45°C (32°F to 113°F)

10% to 90%

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 port (3) Console port (4) Power LED (Power) (5) 1000Base-X SFP interface (6) 1000Base-X SFP interface status LED

Rear Panel

(2) 10/100/1000Base-T auto-sensing Ethernet port status LED

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

z 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

z DC 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

Compliant standard

Transmission baud rate

Service

RJ-45

EIA/TIA-232

9600 bps to 115200 bps (defaulting to 38400 bps)

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 1-3 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

Table 1-1 for details.

Item Specification

Connector type

Interface speed and operating mode

Max transmission distance

Transmission medium

Standard

RJ-45

z 10 Mbps, full duplex z 100 Mbps, full duplex z 1000 Mbps, full duplex z MDI/MDI-X, auto-sensing

100 m (328.1 ft.)

Category-5 unshielded twisted pair cable

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

interfaces

Transceiver

type

Transceiver

Table 1-4.

Central

wavelength

Connector Fiber

Max

transmis

sion

distance

GE SFP transceiver

SFP-GE-SX-MM850-A 850 nm

SFP-GE-LX-SM1310-A

1310 nm

SFP-GE-LH40-SM1310

SFP-GE-LH40-SM1550

1550 nm

SFP-GE-LH70-SM1550

SFP-GE-LX-SM1310-B IDI*

SFP-GE-LX-SM1490-B IDI*

TX: 1310 nm

RX: 1490 nm

TX: 1490 nm

RX: 1310 nm

50/125 µm multimode optical fiber

62.5/125 µm multimode optical fiber

9/125 µm single mode optical fiber

550 m (0.34 miles)

275 m (0.17 miles)

10 km (6.21 miles)

40 km (24.86 miles)

70 km (43.50 miles)

10 km (6.21 miles)

SFP-GE-T — RJ-45

Twisted pair cable

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

Port mode LED

10/100/1000Base-T auto-sensing Ethernet port status LED

1000Base-X SFP interface status LED

Power LED

The power LED indicates the operation status of the switch.

Table 1-6 Description of the power LED

LED Status Description

3Com Baseline Switch 2928-HPWR Plus

3Com Baseline Switch 2928-PWR Plus and 3Com Baseline Switch 2928-HPWR Plus

All series

See “

RPS Status LED” on page

1-10.

See “Port Mode LED” on page 1-11.

See “10/100/1000Base-T

Auto-Sensing Ethernet Port Status

” on page 1-11

LED

See “1000Base-X SFP Interface

Status LED

” on page1-13.

Power

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

RPS

Solid green The switch functions normally.

Blinking green (1 Hz)

Blinking green (3 Hz)

Off The switch has been powered off.

Solid green The RPS DC input is normal.

Off

The system is performing power-on self test (POST) or downloading software.

The POST has failed or another fatal error has been detected.

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

z Each 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.

z For 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

Switch model

3Com Baseline Switch 2920-SFP Plus

3Com Baseline Switch 2928-SFP Plus

Port

mode

LED

—

Ethernet port status

LED

Green

Fast blinking

Off

Fast blinking

The port operates at a rate of 1000 Mbps

Data is being transmitted or received at 1000 Mbps

The port is not up or does not operate at 1000 Mbps

The port operates at a rate of 10/100 Mbps

Data is being transmitted or received at 10/100 Mbps

Yellow

Blinking (3 Hz)

Off

The POST has failed

The port is not up or does not operate at 10/100 Mbps

Meaning

1-11

Switch model

3Com Baseline Switch 2952-SFP Plus

3Com Baseline Switch 2928-PWR Plus

3Com Baseline Switch 2928-HPWR Plus

Port

mode

LED

—

Solid green (rate mode)

Blinking green (PoE mode)

Ethernet port status

LED

Solid green

Fast blinking green

Solid yellow

Fast blinking yellow

Off

Green

Fast blinking

Off

Fast blinking

Yellow

Blinking (3 Hz)

Off

On PoE power supply is normal.

Blinking at 3

Green

Off

Meaning

The port operates at a rate of 1000 Mbps

Data is transmitted or received at a rate of 1000 Mbps

The port operates at a rate of 10/100 Mbps

Data is transmitted or received at a rate of 10/100 Mbps

The port is not up or the POST has failed

The port operates at a rate of 1000 Mbps

Data is transmitted or received at a rate of 1000 Mbps

The port is not up or does not operate at 1000 Mbps

The port operates at a rate of 10/100 Mbps

Data is transmitted or received at a rate of 10/100 Mbps

The POST has failed

The port is not up or does not operate at 10/100 Mbps.

Power consumption of the device attached to the port exceeds the upper limit of the power supply consumption of the port, or the available power of the switch is not enough for power supply of the port.

No PoE power supply is provided on the port.

The device connected to the interface is not a PD device or a PoE failure occurs

Yellow

Blinking (3 Hz)

Off

The POST has failed

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

2 Installation Preparations

Safety Precautions

To avoid any device impairment and bodily injury caused by improper use, observe these rules:

z Before cleaning the switch, plug out the power cord of the switch first. Do not clean the switch with

wet cloth or liquid.

z Do not place the switch near water or in a damp environment. Prevent water or moisture from

entering the switch chassis.

z Do not place the switch on an unstable case or desk. The switch might be damaged severely in

case of a fall.

z Ensure proper ventilation of the equipment room and keep the ventilation vents of the switch free of

obstruction.

z Connect the yellow-green protection PGND cable before power-on.

z Make sure that the operating voltage is in the range labeled on the power of the switch.

z Do not open the chassis to avoid electrical shocks when the switch is operating or just when the

switch is powered off.

Installation Site

The 3Com Baseline Switch 2900 Family must be used indoors. You can mount the switch in a rack or on

a workbench, but make sure:

z Adequate clearance is reserved at the air inlet/exhaust vents for ventilation.

z The rack or workbench has a good ventilation system.

z The rack is sturdy enough to support the device and its accessories.

z The rack or workbench is well earthed.

To ensure normal operation and long service life of your switch, install it in an environment that meets

the requirements described in the following subsections.

Temperature/Humidity

You must maintain a proper temperature and humidity in the equipment room. Long-term high humidity

may lead to bad insulation, electricity leakage, mechanical property changes, and metal corrosion.

However, if the relative humidity is too low, captive screws may become loose as the result of

contraction of insulation washers and static electricity may be produced in a dry environment to

jeopardize the circuits on the device. A high temperature is the most undesirable condition, because it

accelerates the aging of insulation materials and thus significantly lowers reliability and service life of

the switch.

For the temperature and humidity requirements of different models, refer to

Cleanness

Dust is a hazard to the operating safety of your device. The dust accumulated on the chassis can be

adsorbed by static electricity and result in poor contact of metal connectors or metal contact points.

Table 2-1 on page 2-2.

2-1

Especially when the indoor relative humidity is low, electrostatic adsorption is more likely to happen.

This can not only shorten the service life of your device but also cause communications failures. The

following table lists the dust concentration limit.

Table 2-1 Dust concentration limit in the equipment room

Substance Concentration limit (particles//m³)

Dust

≤ 3 x 104 (no visible dust on the tabletop over three days)

Note: The dust diameter is greater than or equal to 5 μm.

Besides dust, there are rigorous limits on the content of harmful substances in the air that can

accelerate the corrosion and aging of metals, such as chloride, acid, and sulfide in the equipment room.

The equipment room must be protected against ingression of harmful gases such as SO

and Cl

. For specific requirements, see the following table.

Table 2-2 Harmful gas limits in the equipment room

Gas Maximum concentration (mg/m3)

H2S 0.006

NH3 0.05

Cl2 0.01

Electromagnetic Susceptibility

0.2

, H2S, NH3,

The operation of your switch can be affected by external interferences, such as conducted emission by

capacitance coupling, inductance coupling, electromagnetic wave radiation, and common impedance

(including the grounding system) coupling, and leads (power cables, signaling cables and output wires).

To eliminate the interferences, pay attention to the following:

z As the AC power system is a TN system, use a single-phase three-wire power socket with a

protection earth (PE) to effectively filter interference from the power grid.

z Keep the device far away from radio transmitting stations, radar stations, and high-frequency

devices.

z Use electromagnetic shielding, for example, shielded interface cables, when necessary.

z Route interface cables only indoors to prevent signal ports from getting damaged by over-voltage

or over-current caused by lightning strikes.

Laser Safety

The 3Com Baseline Switch 2900 Family are Class 1 laser devices.

2-2

When an SFP module on the 3Com Baseline Switch 2900 Family is operating, do not stare into the

optical port because the laser light emitted from the optical fiber may hurt your eyes.

Installation Tools

z Flat-blade screwdriver

z Phillips screwdriver

z ESD-preventive wrist strap

No installation tools are shipped with the 3Com Baseline Switch 2900 Family.

2-3

3 Installing a Switch

On a mounting screw of the chassis of the 3Com series switches, there is a seal labeled. You need to

keep it intact before asking the agent to maintain the switch. You need to get the permission of the local

agent before you can open the chassis. Otherwise, you will be responsible for irreversible damages

caused by your operations.

Installing the Switch into a 19-Inch Rack Using Mounting Brackets

The 3Com Baseline Switch 2900 Family is shipped with a pair of mounting brackets to fix and support

the switch.

Figure 3-1 Install a 3Com Baseline Switch 2900 Family into a 19-inch rack

Figure 3-1 shows how to install a 3Com Baseline Switch 2900 Family into a 19-inch rack.

Introduction to Mounting Brackets

Table 3-1 Mounting brackets for the 3Com Baseline Switch 2900 Family

Model Mounting bracket Description

3Com Baseline Switch 2920-SFP Plus

3Com Baseline Switch 2928-SFP Plus

3Com Baseline Switch 2952-SFP Plus

Two-holed mounting brackets (standard)

Figure 3-2 shows the appearance.

3Com Baseline Switch 2928-PWR Plus

3Com Baseline Switch 2928-HPWR Plus

Four-holed mounting brackets (standard)

3-1

Figure 3-3 shows the appearance.

Figure 3-2 Two-holed mounting bracket

(1) Screw hole used to fix the mounting bracket to the rack (with an M6 screw)

Figure 3-3 Four-holed mounting bracket

(1) Screw hole used to fix the mounting bracket to the rack (with an M6 screw)

(2) Screw hole used to fix the switch to the mounting bracket

Attaching the Mounting Brackets to a Switch

The installation of actual mounting brackets vary with devices.

3-2

The mounting brackets can be attached to a switch for center, front, or rear mounting. You can choose a

proper position according to the actual requirements.

Table 3-2 shows the position support for the 3Com

Baseline Switch 2900 Family.

Table 3-2 Description of mounting position support for the 3Com Baseline Switch 2900 Family

Model Mounting position Description

3Com Baseline Switch 2920-SFP Plus

Front or rear part of the chassis

3Com Baseline Switch

See

Figure 3-4, and Figure

3-5.

2928-SFP Plus

3Com Baseline Switch 2952-SFP Plus

Front or rear part of the chassis

3Com Baseline Switch 2928-PWR Plus

3Com Baseline Switch

Front, center, or rear part of the chassis

2928-HPWR Plus

Step1 Place the L2 side of a mounting bracket (see

mounting holes of the bracket with the holes of the chassis. See

installing a two-holed mounting bracket, and

four-holed mounting bracket.

Step2 Fasten the screws.

Figure 3-4 Install a two-holed mounting bracket on the chassis (front mounting)

See Figure 3-6, and Figure

3-8.

See

Figure 3-6, Figure 3-7,

Figure 3-8.

and

Figure 3-2 and Figure 3-3) to the switch and align the

Figure 3-4 and Figure 3-5 when

Figure 3-6, Figure 3-7, and Figure 3-8 when installing a

Figure 3-5 Install a two-holed mounting bracket on the chassis (rear mounting)

3-3

Figure 3-6 Install a four-holed mounting bracket on the chassis (front mounting)

Figure 3-7 Install a four-holed mounting bracket on the chassis (center mounting)

Figure 3-8 Install a four-holed mounting bracket on the chassis (rear mounting)

Mounting the Switch to a Rack

Step1 Put on an ESD-preventive wrist strap and make sure the rack is well grounded and is firm enough to

hold the switch and cables.

Step2 Attach the mounting brackets to the switch. For details, refer to “

” on page 3-2.

Switch

Step3 Hold the bottom of the switch and gently place the switch on the rack to a proper location with one

person.

Attaching the Mounting Brackets to a

Step4 Fix the mounting brackets with screws (anti-rust screws prepared by yourself) with another person to

install the switch to the rack horizontally.

3-4

If support trays are provided on the rack, you can mount the switch to the rack with mounting brackets

and trays. Put the switch on the support tray and slide the switch to an appropriate location. Then fix the

mounting brackets.

Figure 3-9 Mount the 3Com Baseline Switch 2928-PWR Plus to a rack

Installation of other 3Com Baseline Switch 2900 Family into a rack is similar to that of the 3Com

Baseline Switch 2928-PWR Plus.

3-5

Mounting the Switch on a Workbench

In many cases, standard 19-inch cabinets are not available. Therefore, switches are often placed on

clean workbenches. To place the switch on a workbench, follow these steps:

Step1 Place the switch with bottom up carefully, and then clean the round holes on the chassis bottom with dry

cloth.

Step2 Attach the rubber feet to the four round holes on the chassis bottom. Step3 Place the switch with upside up on the workbench.

During the operation, you simply need to:

z Make sure that the workbench is flat and sturdy.

z Ensure good ventilation and a space of 10 cm (3.94 in.) around the chassis for heat dissipation.

z Avoid heavy objects on the switch.

Connecting the PGND Cable

z Correctly connecting the switch PGND cable is crucial to the lightning protection and

electromagnetic susceptibility (EMS) of a switch.

z The power receptacles and grounding terminals in this section are for illustration only.

The power input end of the switch is connected with a noise filter, whose central ground is directly

connected to the chassis, forming the so-called chassis ground (commonly known as PGND). This

chassis ground must be securely connected to the earth so that the faradism and leakage electricity can

be safely released to the earth, enhancing the EMS capability of the switch.

When a Grounding Strip is Available

When a grounding strip is available at the installation site, attach one end of the yellow-green PGND

cable of the switch to the grounding screw on the grounding strip (the grounding screw and the

grounding hole are on the rear panel of the switch and are marked with a grounding sign). To do this,

follow these steps:

Step1 Remove the grounding screw from the rear panel of the switch chassis. Step2 Put the supplied OT terminal of the PGND cable on the grounding screw. Step3 Fasten the grounding screw, which is attached with the OT terminal of the PGND cable, into the

grounding screw hole with a screwdriver.

3-6

Figure 3-10 Connect the PGND cable to the grounding hole of switch

(1) Rear panel of the switch (2) Grounding sign (3) Grounding hole (4) OT terminal (5) PGND cable (6) Grounding screw

To attach the other end of the PGND cable to the grounding strip in the equipment room, follow these

steps:

Step1 Cut the PGND cable to a proper length according to the distance between the switch and the grounding

strip.

Step2 Peel 5 mm (0.20 in.) of insulation sheath using a wire stripper, and then insert the naked metal part

through the insulation covering into the end of the OT terminal.

Step3 Secure the metal part of the cable to the OT terminal with a crimper, and then cover it with the insulation

covering. Then heat the insulation covering with a blowing machine to let it completely cover the metal

part.

Step4 Connect the OT terminal to the grounding pole of the grounding strip, and then fasten it with a hex nut.

Figure 3-11 Connect the PGND cable to the grounding strip

(1) Grounding post (2) Grounding strip (3) PGND cable (4) Hex nut

3-7

z The PGND cables supplied with the 3Com Baseline Switch 2900 Family do not provide OT

terminals at the ends connecting the grounding strip. You need to prepare proper OT terminals by

yourself.

z The fire main and lightning rod of a building are not suitable for grounding the switch. The PGND

cable of the switch should be connected to the grounding device for the equipment room.

Where a Grounding Conductor Can be Buried

When there is no grounding strip, but an area with exposed earth is available nearby where a grounding

conductor can be buried, hammer a 0.5 m (1.64 ft.) or longer angle iron or steel tube into the earth. The

angle iron should have a dimension no less than 50 × 50 × 5 mm (1.97 × 1.97 × 0.20 in.) and the steel

tube should have a wall thickness no less than 3.5 mm (0.14 in.) and be zinc-coated. Weld the

yellow-green PGND cable to the angel iron or steel tube and treat the joint for corrosion protection.

Figure 3-12 Ground the switch by burying the grounding conductor into the earth

(1) Grounding screw (2) PGND cable (3) Earth (4) Joint (5) Grounding conductor (6) Switch rear panel

In Other Installation Sites

When the switch is AC-powered

For an AC-powered switch, if neither of the above-mentioned two conditions is available, ground the

switch through the PE wire of the AC power supply. Make sure the PE wire is well connected to the

ground at the power distribution room or AC transformer side, the switch PE terminal and the PE wire

are well connected, and the three-wire input cable of the PGND cable is used for the power supply cable.

If the PE wire of the AC power supply is not grounded at the power distribution room or AC transformer

side, report the problem and make reconstructions.

3-8

Figure 3-13 Ground through an AC power PE wire

(1) Three-wire AC power input cable (2) Switch rear panel

Use the PGND cable provided with the switch to connect the grounding strip in the equipment room.

Otherwise, the grounding effect may not be ensured, which easily causes damage to the switch.

Connecting the Power Cord

Connecting an AC Power Cord

The 3Com Baseline Switch 2900 Family uses an external AC power system for its power supply. Follow

these steps to connect an AC power cord:

Step1 Connect one end of the supplied PGND cable to the grounding screw on the rear panel of the chassis

and the other end to the ground as near as possible.

Step2 Insert one end of the AC power cord to the AC power receptacle on the rear panel of the chassis, as

shown in

Step3 Connect the other end of the power cord to a power source. Step4 Check whether the power LED on the front panel of the switch is ON. If the LED is ON, it shows the

power cord is properly connected.

Figure 3-14.

Figure 3-14 Connect the AC power cord

3-9

Make sure that the PGND cable has been properly connected before powering on the switch.

Connecting an RPS DC Power Cord

The 3Com Baseline Switch 2928-HPWR Plus also supports RPS DC power input with the input voltage

ranging from –52 V to –55 V. Follow these steps to install a DC power cord:

Step1 Connect one end of the supplied PGND cable to the grounding screw on the rear panel of the chassis

and the other end to the ground as near as possible.

Step2 Keep the upside of the DC RPS plug on top and plug it in the RPS DC receptacle (see callout 1 in

Figure

3-15). (If you plug it with the upside down, the insertion is not smooth because of the specific structure

design of the RPS DC receptacle and the RPS plug.)

Step3 Use a flat-blade screwdriver to fix the two screws on the RPS plug clockwise to secure the plug to the

RPS DC receptacle (see callout 2 in

Figure 3-15).

Step4 Connect the other end of the RPS DC power cord to the external RPS power supply system (–54 V/25

A output).

Step5 Check whether the RPS LED on the front panel of the switch is ON. If the LED is ON, it shows the power

cord is properly connected.

Figure 3-15 Connect an RPS DC power cord to the 3Com Baseline Switch 2928-HPWR Plus

z Make sure that the PGND cable has been properly connected before powering on the switch.

z The length of the DC power cable must be less than 3 m (9.8 ft).

Verifying the Installation

Before powering on the switch, check that:

z There is enough space for heat dissipation around the switch, and the rack or workbench is stable.

z The PGND cable is connected.

3-10

z The selected power module matches that required by the switch.

z The power cables are properly connected.

z All the interface cables are cabled indoors. If there is any cable wired outdoors, verify that socket

strip with lightning protection and lightning arresters for network ports have been properly

connected.

3-11

4 Initial Power-On

Setting Up the Configuration Environment

Set up the configuration environment as follows:

Connect a terminal (a PC in this example) to the console port on the switch with a console cable.

Figure 4-1 Network diagram for configuration environment setup

Connecting the Console Cable

Console Cable

A console cable is an 8-core shielded cable. One end of the cable is a crimped RJ-45 connector, which

is connected to the console port of the switch, and the other end is a DB-9 female connector, which is

connected to the serial port on the console terminal, as shown below.

Figure 4-2 Console cable

Table 4-1 Console cable pinouts

RJ-45 Signal Direction DB-9

1 RTS ← 7

2 DTR ← 4

4-1

RJ-45 Signal Direction DB-9

3 TXD ← 3

4 CD → 1

5 GND — 5

6 RXD → 2

7 DSR → 6

8 CTS → 8

Connection Procedure

When you want to use the terminal to configure the switch, follow these steps to connect a terminal

device to the switch using the console cable:

1) Plug the DB-9 female connector of the console cable to the serial port of the console terminal or

PC.

2) Connect the RJ-45 connector of the console cable to the console port of the switch.

Pay attention to the mark on the console port and be sure to plug the connector to the correct port.

z When connecting a PC to a powered-on switch, you are recommended to connect the DB-9

connector of the console cable to the PC before connecting the RJ-45 connector to the switch.

z When disconnecting a PC from a powered-on switch, you are recommended to disconnect the

DB-9 connector of the console cable from the PC after disconnecting the RJ-45 connector from the

switch.

Setting Terminal Parameters

When setting up the configuration environment through the console port, the terminal or PC can use the

terminal emulation program to communicate with the switch. You can run the HyperTerminal of the

Windows operating system to connect to other PCs, network devices, and Telnet sites. For detailed

information and the use of the HyperTerminal, refer to the HyperTerminal Help documentation in Help

and Support Center on the PC running the Windows operating system.

In the following configuration procedure, Windows XP HyperTerminal is used to communicate with the

switch.

1) Start the PC and run the terminal emulation program.

2) Set terminal parameters as follows:

z Bits per second: 38,400

4-2

z Data bits: 8

z Parity: None

z Stop bits: 1

z Flow control: None

z Emulation: VT100

The specific procedure is as follows:

Step1 Select Start > Programs > Accessories > Communications > HyperTerminal to enter the

HyperTerminal window. The Connection Description dialog box appears, as shown below.

Figure 4-3 Connection description of the HyperTerminal

Step2 Type the name of the new connection in the Name text box and click OK. The following dialog box

appears. Select the serial port to be used from the Connect using drop-down list. Figure 4-4 Set the serial port used by the HyperTerminal connection

4-3

Step3 Click OK after selecting a serial port. The following dialog box appears. Set Bits per second to 38400,

Data bits to 8, Parity to None, Stop bits to 1, and Flow control to None. Figure 4-5 Set the serial port parameters

Step4 Click OK after setting the serial port parameters and the system enters the HyperTerminal window

shown below.

Figure 4-6 HyperTerminal window

4-4

Step5 Click Properties in the HyperTerminal window to enter the Switch Properties dialog box. Click the

Settings tab, set the emulation to VT100, and then click OK. Figure 4-7 Set terminal emulation in Switch Properties dialog box

Booting the Switch

Checking Before Power-On

Before powering on the switch, verify that:

z The power cable is properly connected.

z The power supply voltage meets the requirement of the switch.

z The console cable is properly connected; the terminal or PC used for configuration has been

started; and the configuration parameters have been set.

Powering On the Switch

The 3Com Baseline Switch 2900 Family have the same Boot ROM display style. This document uses

the Boot ROM output information on the 3Com Baseline Switch 2928-SFP Plus as an example:

Starting......

4-5

CPU Clock Speed : 333MHz Memory Type : DDR2 SDRAM Memory Size : 128MB Flash Size : 128MB CPLD Version : 001 PCB Version : Ver.A Mac Address : 000ef2002900 Press Ctrl-B to enter Extended Boot menu...1

The last line asks whether you want to enter the Boot ROM menu. The system waits one second for

your response.

z The system has two startup modes: normal startup and fast startup. The normal startup mode

requires a little longer time than the fast startup mode because of more self-test operations.

z By default, the system starts up in fast mode and the waiting time here is one second. If you set the

startup mode to normal, the waiting time is five seconds. The following section describes the

setting of the startup mode.

z If you press Ctrl + B within one second, the Boot ROM menu is displayed.

BOOT MENU

1. Download application file to flash

2. Select application file to boot

3. Display all files in flash

4. Delete file from flash

5. Modify BootRom password

6. Enter BootRom upgrade menu

7. Skip current system configuration

8. Set BootRom password recovery

9. Set switch startup mode

0. Reboot

Enter your choice(0-9):

Table 4-2 describes the fields above.

Table 4-2 Description on the fields

Item Description

1. Download application file to flash Download the application file to the flash memory

2. Select application file to boot Select the application file to boot

3. Display all files in flash Display all files in the flash memory

4. Delete file from flash Delete files from the flash memory

5. Modify BootRom password Modify the Boot ROM password

4-6

Item Description

6. Enter BootRom upgrade menu Enter the Boot ROM update menu

7. Skip current system configuration

Skip the current configuration file (this configuration is valid once)

8. Set BootRom password recovery Restore the Boot ROM password

9. Set switch startup mode Set the startup mode of the switch

0. Reboot Restart the switch

z If you perform no operation or press a key other than Ctrl + B within one second, once the

remaining waiting time becomes zero, the system begins to automatically start up and the following

information is displayed:

Starting to get the main application file--flash:/S2900-CMW520-A1101.bin!......

.................................................................

The main application file is self-decompressing................................

...............................................................................

..............................Done!

System is starting... User interface aux0 is available.

Press ENTER to get started.

Press Enter and enter the correct username (admin by default) and password (no password by default).

The following prompt is displayed:

<3Com Baseline Switch >

You can configure the switch now.

Changing the Boot Mode

By default, the system starts up in fast boot mode. If you want to change the boot mode to normal, press Ctrl + B within one second to enter the Boot ROM menu showed below:

BOOT MENU

1. Download application file to flash

2. Select application file to boot

3. Display all files in flash

4. Delete file from flash

5. Modify BootRom password

6. Enter BootRom upgrade menu

7. Skip current system configuration

8. Set BootRom password recovery

9. Set switch startup mode

0. Reboot

Enter your choice(0-9):

Enter 9. The system prompts you to change the startup mode:

The current mode is fast startup mode!

4-7

Are you sure you want to change it to full startup mode? Yes or No (Y/N):

Enter Y. The system displays the following information:

Setting...Done! BOOT MENU

1. Download application file to flash

2. Select application file to boot

3. Display all files in flash

4. Delete file from flash

5. Modify BootRom password

6. Enter BootRom upgrade menu

7. Skip current system configuration

8. Set BootRom password recovery

9. Set switch startup mode

0. Reboot Enter your choice(0-9):

Enter 0. The system reboots in normal startup mode and displays the following information:

Starting......

************************************************************************ * * * 3COM 2928-SFP Plus BOOTROM, Version 102 * * * ************************************************************************ Creation Date : Jan 8 2009 CPU Type : ARM926 CPU L1 Cache : 32KB CPU Clock Speed : 333MHz Memory Type : DDR2 SDRAM Memory Size : 128MB Flash Size : 128MB CPLD Version : 001 PCB Version : Ver.A Mac Address : 000ef2002900 Press Ctrl-B to enter Extended Boot menu...5

In normal startup mode, the waiting time here is five seconds. If you press Ctrl + B within five seconds, the Boot ROM menu is displayed. If you perform no operation or press a key other than Ctrl + B within

five seconds, the system begins to automatically start up and the following information is displayed:

Starting to get the main application file--flash:/S2900-CMW520-A1101.bin!......

................................................................

The main application file is self-decompressing................................

...............................................................................

..............................Done!

System is starting...

Board checking..........................LS51LTSR

SDRAM fast selftest..........................OK!

Flash fast selftest..........................OK!

4-8

CPLD selftest................................OK!

Switch chip selftest.........................OK!

PHY selftest.................................OK!

Please check leds......................FINISHED!

User interface aux0 is available.

Press ENTER to get started.

Press Enter and enter the correct username (admin by default) and password (no password by default).

The following prompt is displayed:

<3Com Baseline Switch >

You can configure the switch now.

4-9

5 Loading Software

Introduction

The 3Com Baseline Switch 2900 Family does not provide independent Boot ROM program but

integrates it with the application program in host software package with the extension name of .bin.

z Loading application files: Download the host software package to the flash memory on the switch

and set the attribute (main, backup, or none) of the application files.

z Upgrading the Boot ROM program: Use Boot ROM files in the host software package to upgrade

the Boot ROM program of the switch.

The entire Boot ROM program consists of the basic segment and extended segment.

z The basic segment is used for basic initialization of the system.

z The extended segment provides abundant human-computer interaction (HCI) functions and

available network interfaces. It can be used to upgrade the applications and boot the system.

Boot ROM program (stored together with application programs in the host software package with an

extension name of .bin) used for upgrade are complete Boot ROM program.

Approaches for Loading Application and Configuration Files

You can load application files through the Boot ROM menu, command line interface (CLI), and Web

interface. For application upgrade through the CLI and Web interface, refer to the software upgrade

section in the 3Com Baseline Switch 2900 Family User Guide. Boot ROM upgrade through the Boot

ROM menu is introduced in this manual.

Table 5-1 Approaches for loading application and configuration files of the switch

Approach Section

Loading Files Using XMODEM Through Console Port

Loading files through the Boot ROM menu

Loading Files Using TFTP Through Ethernet Port

Loading Files Using FTP Through Ethernet Port

Loading Files Through the Boot ROM Menu

To load the Boot ROM and application files through the Boot ROM menu, you need to correctly connect

a user terminal to the switch using a console cable.

5-1

Introduction to the Boot ROM Menu

Starting......

Press Ctrl-B to enter Extended Boot menu...1

When the system displays “Press Ctrl-B to enter Extended Boot menu”, press Ctrl + B. Then, the

following prompt is displayed:

Please input BootRom password:

z By default, the system starts up in fast mode and the waiting time here is one second. If you set the

startup mode to normal, the waiting time is five seconds. For the setting of the startup mode, refer

Changing the Boot Mode” on page 4-7.

to “

z To enter the Boot ROM menu in fast mode, you need to press Ctrl + B within one second when the

system displays “Press Ctrl-B to enter Boot Menu”. Otherwise, the system starts decompressing

the application files.

z You need to restart the switch if you want to enter the Boot ROM menu after the application files are

decompressed.

Enter the Boot ROM password (the initial password is null). Then the system displays the Boot ROM

menu.

BOOT MENU

1. Download application file to flash

2. Select application file to boot

3. Display all files in flash

4. Delete file from flash

5-2

5. Modify BootRom password

6. Enter BootRom upgrade menu

7. Skip current system configuration

8. Set BootRom password recovery

9. Set switch startup mode

0. Reboot

Enter your choice(0-9):

The items in the Boot ROM menu are described in

Table 4-2

z Currently, Boot ROM files are not provided separately by the 3Com Baseline Switch 2900 Family;

instead, they are stored together with application files in the files with the name extension of .bin.

z The procedures for loading Boot ROM files and application files are similar except that you need to

select different items (1 for loading application files, and 6 for loading Boot ROM files) in the Boot

ROM menu. This manual takes the loading of Boot ROM files as examples.

Loading Files Using XMODEM Through Console Port

Introduction to XMODEM

XMODEM is a file transfer protocol widely used for its simplicity. XMODEM transfers files through the

console port, supporting data packets of 128 bytes. With respect to reliability, it supports checksum,

CRC, and the error packet retransmission mechanism. Normally, the maximum number of

retransmission attempts is ten.

XMODEM transfer is completed by receiving and sending programs together. Receiving program

initiates packet checking method negotiation by sending the negotiation character. If negotiation passes,

the sending program starts packet transfer. Upon receipt of a complete packet, the receiving program

checks it using the agreed-upon check method. If the check succeeds, the receiving program sends an

acknowledgement character; if the check fails, it sends a reject character. Upon receipt of the

acknowledgement, the sending program continues to send the next packet; upon receipt of the reject, it

retransmits the packet.

Loading a Boot ROM file

Complete the following tasks to load a Boot ROM file using XMODEM through the console port (For

details about the HyperTerminal, refer to “

Setting Terminal Parameters” on page 4-2):

Task Remarks

Enter the Boot ROM update menu on the switch

Enter the protocol parameter setting menu

Configure the switch to download files using XMODEM

Required

5-3

Task Remarks

Required

Set the download rate of the console port on the switch

Optional

Change the rate of the serial port on the terminal

Set the baud rate of the serial port on the terminal to be consistent with that of the console port on the switch.

Establish a connection between the terminal and the switch using the changed rate

Uploading an application file from the terminal to the switch

Updating the Boot ROM file on the switch

Optional

Required

Transmit a file from the terminal to the switch using the changed connection rate.

Required

Update the Boot ROM file on the switch.

Optional

Restoring the download rate to the default

Set the baud rate of the serial port on the terminal to be consistent with the default rate of the console port on the switch.

Restarting the switch to make the updated Boot ROM file effective

Required

1) Enter the Boot ROM update menu on the switch

Enter the Boot ROM menu, and then enter 6 or press Ctrl + U after the system displays “Enter your

choice(0-9):” to enter the Boot ROM update menu.

Enter your choice(0-9): 6

1. Update full BootRom

2. Update extended BootRom

3. Update basic BootRom

0. Return to boot menu

Enter your choice(0-3):

The items in the Boot ROM update menu are described in Table 5-2.

Table 5-2 Description of the Boot ROM update menu

Item Description

1. Update full BootRom Update the complete Boot ROM file

2. Update extended BootRom Update the extended Boot ROM section

3. Update basic BootRom Update the basic Boot ROM section

0. Return to boot menu Return to the Boot ROM menu

2) Enter the protocol parameter setting menu

5-4

After the system displays “Enter your choice(0-3):”, enter 1 to enter the protocol parameter setting

menu.

All the Boot ROM files to be loaded are complete Boot ROM files.

1. Set TFTP protocol parameter

2. Set FTP protocol parameter

3. Set XMODEM protocol parameter

0. Return to boot menu

Enter your choice(0-3):

The items in the protocol parameter setting menu are described in Table 5-3.

Table 5-3 Description of the protocol parameter setting menu

Item Description

1. Set TFTP protocol parameter Set TFTP parameters

2. Set FTP protocol parameter Set FTP parameters

3. Set XMODEM protocol parameter Set XMODEM parameters

0. Return to boot menu Return to the Boot ROM menu

3) Configure the switch to download files using XMODEM

Enter 3 to enter the download rate setting menu.

Please select your download baudrate:

1. 9600

2. 19200

3.* 38400

4. 57600

5. 115200

0. Return to boot menu

Enter your choice(0-5):

4) Set the download rate of the console port on the switch

Select an appropriate download rate. For example, if you select 115200 bps, that is, enter 5, the

following information is displayed:

Download baudrate is 115200 bps Please change the terminal's baudrate to 115200 bps and select XMODEM protocol Press enter key when ready

5-5

Now that the console communication baud rate of the switch has been changed to 115200 bps while

that of the terminal is still 38400 bps, the two sides cannot communicate with each other. According to

the prompt, you need to change the baud rate of the terminal to 115200 bps.

z Typically, the size of a .bin file is over 9 MB. Even at a baud rate of 115200 bps, the update takes

tens of minutes.

z If you select 38400 bps as the download rate, you can skip the step “Change the rate of the serial

port on the terminal

.”

5) Change the rate of the serial port on the terminal

To ensure communication between the terminal and the switch, the baud rate of the serial port on the

terminal should be consistent with that of the console port on the switch.

Step1 Select Call > Disconnect in the HyperTerminal window to disconnect the terminal from the switch.

Figure 5-1 Disconnect the terminal from the switch

Step2 Select File > Properties. In the Properties dialog box, click Configure (as shown in

then select 115200 from the Bits per second drop-down list box (as shown in

Figure 5-3).

Figure 5-2), and

5-6

Figure 5-2 Properties dialog box

Figure 5-3 Modify the baud rate

Step3 Select Call > Call to reestablish the connection.

5-7

Figure 5-4 Reestablish the connection

The new settings can take effect only after you reestablish the connection.

6) Establish a connection between the terminal and the switch using the changed rate

Press Enter to reestablish the connection between the terminal and the switch and download the

application file at 115200 bps. The following information is displayed:

Now please start transfer file with XMODEM protocol If you want to exit, Press <Ctrl+X> Loading ...CCCCCCCCCCCCC

Press Ctrl + X to quit downloading files; otherwise, proceed as follows.

7) Uploading an application file from the terminal to the switch

Step1 Select Transfer > Send File in the HyperTerminal window (as shown in

the pop-up dialog box (as shown in

Figure 5-6) to select the application file to be downloaded (for

example, update.bin), and select Xmodem from the Protocol drop-down list. Figure 5-5 Transfer menu

Figure 5-5). Click Browse in

5-8

Figure 5-6 File transmission dialog box

Step2 Click Send. The following dialog box appears:

Figure 5-7 Send the application file using XMODEM

8) Updating the Boot ROM file on the switch

After the Boot ROM file is downloaded, the terminal displays the following information:

Loading ...CCCC Done! Will you Update Basic BootRom? (Y/N):Y

The system asks you whether you want to update the basic Boot ROM section. Click Y and then the

system displays the following information after the update is completed.

Updating Basic BootRom...........Done!

Updating extended BootRom? (Y/N):Y

The system asks you whether you want to update the extended Boot ROM section. Click Y. Then the

system displays the following information after the update is completed:

Updating extended BootRom.........Done!

Please change the terminal's baudrate to 38400 bps, press ENTER when ready.

9) Restoring the download rate to the default

5-9

Set the baud rate to 38400 bps (refer to “Change the rate of the serial port on the terminal” on page 5-6

for detailed operation).

If you select 38400 bps as the download rate, skip this step, that is, you do not need to modify the baud

rate of the HyperTerminal.

10) Restarting the switch to make the updated Boot ROM file effective

Press any key to return to the Boot ROM update menu.

1. Update full BootRom

2. Update extended BootRom

3. Update basic BootRom

0. Return to boot menu Enter your choice(0-3):

Enter 0 to return to the Boot ROM menu, and then enter 0 again. After that, the device is restarted and

the updated Boot ROM file becomes effective.

11) Loading an application file

To load the application file of the switch, enter 1 in the Boot ROM menu. The system displays the

following information:

1. Set TFTP protocol parameter

2. Set FTP protocol parameter

3. Set XMODEM protocol parameter

0. Return to boot menu Enter your choice(0-3):3

Enter 3 to upload an application file using XMODEM.

The procedure of loading an application file is similar to that of loading a Boot ROM file. The difference

lies in that you need to name the Load File name to write the application program to the flash memory

and specify the application file attribute after loading

Load File name : default_file update.bin Free space: 70885376 bytes

Writing flash..................................................................

..........Done!

Please input the file attribute (Main/Backup/None) M Done!

If an application file with a specific attribute already exists when you set a new file with the attribute, the

attribute of the existing file becomes none after the new file becomes effective.

5-10

Loading Files Using TFTP Through Ethernet Port

Introductin to TFTP

Trivial File Transfer Protocol (TFTP) is a TCP/IP protocol used for file transfer between client and server.

It provides a simple and low-overhead file transfer service. TFTP provides unreliable data transfer over

UDP.

Loading a Boot ROM file

Complete the following tasks to load a Boot ROM file using TFTP through an Ethernet port (For details

about the HyperTerminal, refer to “

Task Remarks

Set up the configuration environment

Run the TFTP Server program on the sever Required

Setting Terminal Parameters” on page 4-2):

Required

Connect the switch to the TFTP server through an Ethernet port, and to a PC through the console port. The PC and the TFTP server can be the same device.

Run the terminal emulation program on the PC connected with the switch’s console port. Start the switch and enter the Boot ROM menu. Then enter the protocol parameter setting menu.

Enter the protocol parameter setting menu

Configure the switch to upload the Boot ROM file through TFTP

Update the Boot ROM file on the switch

Restart the switch to make the updated Boot ROM file effective

1) Set up the configuration environment

Connect an Ethernet port of the switch to the server (whose IP address is available) that provides the

file (usually the .bin file) to be downloaded, and connect the console port of the switch to a PC, as

shown in

Figure 5-8 Load applications using TFTP through Ethernet port

Figure 5-8.

Required

Update the Boot ROM file on the switch.

Required

Restart the switch to make the updated Boot ROM file effective.

5-11

The PC and the TFTP server can be the same device.

2) Run the TFTP Server program on the sever

Run TFTP Server on the server connected with the switch’s Ethernet port, and specify the path of the

application file to be downloaded.

3) Run the terminal emulation program on the PC connected with the switch’s console port. Start the

switch and enter the Boot ROM menu. Then enter the protocol parameter setting menu.

If you want to load the Boot ROM file, enter 6 in the Boot ROM menu after the system displays “Enter

your choice(0-9):” to enter the Boot ROM update menu.

1. Update full BootRom

2. Update extended BootRom

3. Update basic BootRom

0. Return to boot menu

Enter your choice(0-3):

4) Enter the protocol parameter setting menu

Enter 1 to update the complete Boot ROM file, and then enter the protocol parameter setting menu.

Bootrom update menu:

1. Set TFTP protocol parameter

2. Set FTP protocol parameter

3. Set XMODEM protocol parameter

0. Return to boot menu

Enter your choice(0-3):

5) Configure the switch to upload the Boot ROM file through TFTP

Enter 1 to update the Boot ROM file using TFTP, and then set the TFTP parameters.

Load File Name :update.bin Server IP Address :10.10.10.2 Local IP Address :10.10.10.3 Gateway IP Address :

The parameters are described in Table 5-4.

Table 5-4 Description of the TFTP parameters

Item Description

Load File Name : Name of the file to be downloaded (for example, update.bin)

Server IP Address : IP address of server (for example, 10.10.10.2)

Local IP Address : IP address of the switch (for example, 10.10.10.3)

Gateway IP Address : IP address of the gateway (suppose it is not specified)

5-12

z Enter the file name and IP addresses based on the actual condition.

z If the switch and the server are on the same network segment, you can specify any unused IP

address of the network for the switch without specifying the gateway’s IP address; if they are not on

the same segment, you need to specify the gateway’s IP address so that the switch can

communicate with the server.

6) Update the Boot ROM file on the switch

Enter the corresponding parameters based on the actual condition. The system displays the following

information:

Loading........................................................................

...............................................................................

................................Done!

Will you Update Basic BootRom? (Y/N):Y

The system asks you whether you want to update the basic Boot ROM section. Click Y. Then the

system displays the following information after the update is complete:

Updating Basic BootRom...........Done!

Updating extended BootRom? (Y/N):Y

The system asks you whether you want to update the extended Boot ROM section. Click Y. Then the

system displays the following information after the update is complete:

Updating extended BootRom.........Done!

7) Restart the switch to make the updated Boot ROM file effective

Press any key to return to the Boot ROM update menu.

Press enter key when ready

1. Update full BootRom

2. Update extended BootRom

3. Update basic BootRom

0. Return to boot menu Enter your choice(0-3):

Enter 0 to return to the Boot ROM menu, and then enter 0 again. After that, the device is restarted and

the updated Boot ROM file becomes effective.

Loading an application file

To load an application file of the switch, enter 1 in the Boot ROM menu. The system displays the

following information:

1. Set TFTP protocol parameter

2. Set FTP protocol parameter

3. Set XMODEM protocol parameter

0. Return to boot menu Enter your choice(0-3):3

You can enter 1 to load the application file.

5-13

The procedure of loading an application file is similar to that of loading a Boot ROM file. The difference

lies in that the system displays the prompt of loading the application file rather than the Boot ROM file.

After loading the application file, the switch displays that you should configure the application attribute,

that is, main, backup, or none. Type a specific attribute to complete loading the application file.

Writing flash..................................................................

................Done!

Please input the file attribute (Main/Backup/None) M Done!

If an application file with a specific attribute already exists when you set a new file with the attribute, the

attribute of the existing file becomes none after the new file becomes effective.

Loading Files Using FTP Through Ethernet Port

Introduction to FTP

The switch can serve as an FTP client by using its Ethernet port to download the system application and

configuration files.

Loading a Boot ROM file

Complete the following tasks to load a Boot ROM file using FTP through an Ethernet port (For details

about the HyperTerminal, refer to “

Setting Terminal Parameters” on page 4-2):

Task Remarks

Required

Connect the switch to the TFTP server through

Set up the configuration environment

an Ethernet port, and to a PC through the console port. The PC and the TFTP server can be the same device.

Run the FTP Server program on the server Required

Run the terminal emulation program on the PC connected with the switch’s console port. Start the switch and enter the Boot ROM menu, and then enter the protocol parameter setting menu.

Enter the protocol parameter setting menu

Required

Configure the switch to load the Boot ROM file through FTP

Update the Boot ROM file on the switch

Restart the switch to make the updated Boot ROM file effective

Required

Update the Boot ROM file on the switch.

Required

Restart the switch to make the updated Boot ROM file effective.

5-14

1) Set up the configuration environment

Connect an Ethernet port of the switch to the server (whose IP address is available) that provides the

file (usually the .bin file) to be downloaded, and connect the console port of the switch to a PC, as

shown in

Figure 5-9.

Figure 5-9 Load applications using FTP through Ethernet port

2) Run the FTP Server program on the server

Run FTP Server on the server connected with the switch’s Ethernet port, configure the FTP username

and password, and specify the path of the application file to be downloaded.

3) Run the terminal emulation program on the PC connected with the switch’s console port. Start the

switch and enter the Boot ROM menu, and then enter the protocol parameter setting menu.

If you want to load the Boot ROM file, enter 6 in the Boot ROM menu after the system displays “Enter

your choice(0-9):” to enter the Boot ROM update menu.

1. Update full BootRom

2. Update extended BootRom

3. Update basic BootRom

0. Return to boot menu Enter your choice(0-3):

4) Enter the protocol parameter setting menu

Enter 1 to update the complete Boot ROM file.

Bootrom update menu:

1. Set TFTP protocol parameter

2. Set FTP protocol parameter

3. Set XMODEM protocol parameter

0. Return to boot menu Enter your choice(0-3):

5) Configure the switch to load the Boot ROM file through FTP

In the protocol parameter setting menu, enter 2 to update the Boot ROM file using FTP, and then set the

FTP parameters.

Load File Name :update.bin Server IP Address :10.10.10.2 Local IP Address :10.10.10.3 Gateway IP Address :0.0.0.0 FTP User Name :2900 FTP User Password :123

The parameters are described in Table 5-5.

5-15

Table 5-5 Description of the FTP parameters

Item Description

Load File Name : Name of the file to be downloaded

Server IP Address : IP address of the PC

Local IP Address : IP address of the switch

Gateway IP Address : IP address of the gateway

FTP User Name

FTP User Password

Username for logging in to the FTP server, which should be consistent with that configured on the FTP server.

Password for logging in to the FTP server, which should be consistent with that configured on the FTP server.

z Enter the file name and IP addresses based on the actual condition.

z If the switch and the server are on the same network segment, you can specify any unused IP

address of the network for the switch without specifying the gateway’s IP address; if they are not on

the same segment, you need to specify the gateway’s IP address so that the switch can

communicate with the server.

6) Update the Boot ROM file on the switch

Enter the corresponding parameters based on the actual condition. The system displays the following

information:

Will you Update Basic BootRom? (Y/N):Y

The system asks you whether you want to update the basic Boot ROM section. Click Y. The system

displays the following information after the update is complete:

Updating Basic BootRom...........Done!

Updating extended BootRom? (Y/N):Y

The system asks you whether you want to update the extended Boot ROM section. Click Y and then the

system displays the following information after the update is complete:

Updating extended BootRom.........Done!

7) Restart the switch to make the updated Boot ROM file effective

Press any key to return to the Boot ROM update menu.

Press enter key when ready

1. Update full BootRom

2. Update extended BootRom

3. Update basic BootRom

0. Return to boot menu Enter your choice(0-3):

Enter 0 to return to the Boot ROM menu, and then enter 0 again. After that, the device is restarted and

the updated Boot ROM file becomes effective.

5-16

Loading an application file

To load an application file of the switch, enter 1 in the Boot ROM menu. The system displays the

following information:

1. Set TFTP protocol parameter

2. Set FTP protocol parameter

3. Set XMODEM protocol parameter

0. Return to boot menu Enter your choice(0-3):3

You can enter 2 to load the application file.

The procedure of loading an application file is similar to that of loading a Boot ROM file. The difference

lies in that the system displays the prompt of loading the application file rather than the Boot ROM file.

After loading the application file, the switch displays that you should configure the application attribute,

that is, main, backup, or none. Type a specific attribute to complete loading the application file.

Writing flash..................................................................

................Done!

Please input the file attribute (Main/Backup/None) M Done!

If an application file with a specific attribute already exists when you set a new file with the attribute, the

attribute of the existing file becomes none after the new file becomes effective.

5-17

6 Maintenance and Troubleshooting

File Loading Failure

If file loading fails, the system runs steadily using the original system files. In this case, check whether

the physical ports are properly connected.

z If not, reconnect them correctly and restart the loading procedure.

z If so, view the loading procedure information displayed on the HyperTerminal to check for input

errors. If there is any input error, restart the loading procedure with correct input.

Common input errors include:

z Fail to set the baud rate of the HyperTerminal to 38,400 bps when loading files at a baud rate other

than 9,600 bps through XMODEM.

z Enter an incorrect IP address, software name, or path of the TFTP server when using TFTP.

z Enter an incorrect IP address, software name, username, or password when using FTP.

If file loading fails when there are neither physical connection problems nor input errors, please contact

your sales agent for help.

Password Loss

User Password Loss

If you have forgotten the user password, you can enter the Boot ROM menu:

BOOT MENU

1. Download application file to flash

2. Select application file to boot

3. Display all files in flash

4. Delete file from flash

5. Modify BootRom password

6. Enter BootRom upgrade menu

7. Skip current system configuration

8. Set BootRom password recovery

9. Set switch startup mode

0. Reboot

Enter your choice(0-9):

Enter 7, and then restart the switch. After the switch is restarted, the user password is removed.

Boot ROM Password Loss

Please contact your sales agent.

6-1

Power Supply Failure

The 3Com Baseline Switch 2928-HPWR Plus adopts AC power input, RPS power input, or both RPS

and AC power inputs. Other 3Com Baseline Switch 2900 Family adopt AC power input only.

You can determine whether the power system of a switch functions normally by viewing the power LED

or RPS power LED on the front panel.

With AC power input

When AC power input is used for power supply of a switch, you can check the power LED. The power

LED stays on when power system is normal. Otherwise, please check whether:

z The power cord is correctly connected, the power receptacle on the switch and the AC power

socket function normally.

z The power input to the switch is normal.

z The operating temperature of the switch is in the appropriate range and good ventilation is ensured

for the power supply unit. PoE switches support over-temperature protection, allowing the internal

power module to enter the protection state if the temperature is too high and then restore power

supply after the temperature becomes normal.

With RPS power input

When RPS power input is adopted, you can check the power LED or RPS power LED to judge the

status of the power system. Both LEDs stay on when the power system functions normally. Otherwise,

please check whether:

z The RPS DC power cord is correctly connected.

z The RPS power supply is normal.

z The operating temperature of the switch is in the appropriate range and good ventilation is ensured

for the power supply unit. PoE switches support over-temperature protection, allowing the internal

power module to enter the protection state if the temperature is too high and restore power supply

after the temperature becomes normal.

With both AC and RPS power supplies

When both the AC and RPS power supplies are adopted, you can check the power LED and the RPS

power LED to determine the status of each power input.

1) The power LED is off.

In this case, both the AC and RPS power inputs are abnormal. Please check that:

z The power cord is correctly connected, the power receptacle on the switch and the AC power

socket function normally.

z The AC power input to the switch is normal.

z The RPS DC power cord is correctly connected and the RPS power supply is normal.

z The operating temperature of the switch is in the appropriate range and a good ventilation is

ensured for the power supply unit. PoE switches support over-temperature protection, allowing the

internal power module to enter the protection state if the temperature is too high and then restore

power supply after the temperature becomes normal.

2) The power LED is on while the RPS LED is off.

The RPS power input is abnormal, please check that:

z The RPS DC power cord is correctly connected.

6-2

z The RPS power input is normal.

If the cause cannot be located in the preceding steps and the problem persists, contact your local sales

agent or service engineer.

Configuration Terminal Failure

After the switch is powered on and the system is normal, the booting information will be displayed on the

configuration terminal. If the configuration system has any faults, there will not be any screen display at

the configuration terminal or the displayed characters will be totally illegible.

Troubleshooting when there is no terminal display

If there is no output information after the configuration is powered on, please check whether:

z The power supply is normal

z The console cable is properly connected

If no problems are found after the above-mentioned items have been checked, the cause may lie in the

console cable or the settings of the terminal (such as HyperTerminal) parameters. Please perform the

corresponding check.

Troubleshooting when the terminal display is illegible

If there is illegible display at the configuration terminal, the cause might lie in the parameter setting error

at the terminal (such as HyperTerminal). Verify the following terminal parameter (such as hyper terminal)

settings:

z Baud rate: 38,400

z Data bits: 8

z Parity: none

z Stop bits: 1

z Flow control: none

z Emulation: VT100.

6-3

3Com Baseline Switch 2928-PWR Plus, Baseline Switch 2920-SFP Plus, Baseline Switch 2900, Baseline Switch 2928-HPWR Plus, Baseline Switch 2952-SFP Plus Getting Started Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

GUI conventions

Symbols

1 Product Overview

Introduction

3Com Baseline Switch 2920-SFP Plus

Front Panel

Rear Panel

Power Supply System

Cooling System

3Com Baseline Switch 2928-SFP Plus

Front Panel

Rear Panel

Power Supply System

Cooling System

3Com Baseline Switch 2952-SFP Plus

Front Panel

Rear Panel

Power Supply System

Cooling System

3Com Baseline Switch 2928-PWR Plus

Front Panel

Rear Panel

Power Supply System

Cooling System

3Com Baseline Switch 2928-HPWR Plus

Front Panel

Rear Panel

Power Supply System

Cooling System

Ports

Console Port

10/100/1000Base-T Ethernet Port

1000Base-X SFP Interface

LEDs

RPS status LED

Power LED

Port Mode LED

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

1000Base-X SFP Interface Status LED

2 Installation Preparations

Safety Precautions

Installation Site

Temperature/Humidity

Cleanness

Electromagnetic Susceptibility

Laser Safety

Installation Tools

3 Installing a Switch

Installing the Switch into a 19-Inch Rack Using Mounting Brackets

Introduction to Mounting Brackets

Attaching the Mounting Brackets to a Switch

Mounting the Switch to a Rack

Mounting the Switch on a Workbench

Connecting the PGND Cable

When a Grounding Strip is Available

Where a Grounding Conductor Can be Buried

In Other Installation Sites

When the switch is AC-powered

Connecting the Power Cord

Connecting an AC Power Cord

Connecting an RPS DC Power Cord

Verifying the Installation

4 Initial Power-On

Setting Up the Configuration Environment

Connecting the Console Cable

Console Cable

Connection Procedure

Setting Terminal Parameters

Booting the Switch

Checking Before Power-On

Powering On the Switch

Changing the Boot Mode

5 Loading Software

Introduction

Approaches for Loading Application and Configuration Files

Loading files through the Boot ROM menu