Enterasys Networks 2H252-25R User Manual

2H252-25R

SmartSwitch 2200

Installation User’s Guide

FAST ETHERNET WORKGROUP SWITCH

2H252-25R

LED
MODE

RX-TX

DPX-SPD

RESET

COM

123456789

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

PWR
CPU

10

16

12
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131413

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9034005-03

Only qualified personnel should perform installation procedures.

NOTICE

Enterasys Networks reserves the right to make changes in specifications and other information contained in this
document and its web site without prior notice. The reader should in all cases consult Enterasys Networks to determine
whether any such changes have been made.

The hardware, firmware, or software described in this document is subject to change without notice.

IN NO EVENT SHALL ENTERASYS NETWORKS BE LIABLE FOR ANY INCIDENTAL, INDIRECT, SPECIAL,
OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT NOT LIMITED TO LOST PROFITS)
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Enterasys Networks, Inc.
35 Industrial Way
Rochester, NH 03867

 2002 Enterasys Networks, Inc. All rights reserved.
Printed in the United States of America.

Order Number: 9034005-03 November 2002

LANVIEW is a registered trademark and Enterasys Networks, NETSIGHT, MATRIX, WEBVIEW, and any logos
associated therewith, are trademarks of Enterasys Networks, Inc. in the United States and other countries.

All other product names mentioned in this manual may be trademarks or registered trademarks of their respective
companies.

FCC NOTICE

This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device
may not cause harmful interference, and (2) this device must accept any interference received, including interference that
may cause undesired operation.

NOTE: This equipment has been tested and found to comply with the limits for a class A digital device, pursuant to Part
15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment uses, generates, and can radiate radio frequency
energy and if not installed in accordance with the operator’s manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause interference in which case the user
will be required to correct the interference at his own expense.

WARNING: Changes or modifications made to this device which are not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.

INDUSTRY CANADA NOTICE

This digital apparatus does not exceed the class A limits for radio noise emissions from digital apparatus set out in the
Radio Interference Regulations of the Canadian Department of Communications.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils
numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique édicté par le ministère des
Communications du Canada.

VCCI NOTICE

This is a class A product based on the standard of the Voluntary Control Council for Interference by Information
Technology Equipment (VCCI). If this equipment is used in a domestic environment, radio disturbance may arise. When
such trouble occurs, the user may be required to take corrective actions.

CLASS A ITE NOTICE

WARNING: This is a class A product. In a domestic environment this product may cause radio interference in which
case the user may be required to take adequate measures.

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Conformance to Directive(s)/Product Standards: EC Directive 89/336/EEC

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or Light Industrial Environment.

Enterasys Networks, Inc. declares that the equipment packaged with this notice conforms to the above directives.

Contents

Figures ............................................................................................................................................ix

Tables.............................................................................................................................................. x

ABOUT THIS GUIDE

Using This Guide.............................................................................................................xi

Structure of This Guide ...................................................................................................xi

Related Documents........................................................................................................xii

Document Conventions................................................................................................. xiii

1

2

INTRODUCTION

1.1 Overview ......................................................................................................... 1-1

1.1.1 Connectivity ....................................................................................1-2

1.1.2 Runtime IP Address Discovery ....................................................... 1-2

1.1.3 Full Duplex Switched Ethernet........................................................ 1-3

1.1.4 SmartTrunk ..................................................................................... 1-3

1.1.5 Remote Monitoring (RMON) ........................................................... 1-4

1.1.6 Broadcast Suppression................................................................... 1-4

1.1.7 Port/VLAN Redirect Functions ........................................................ 1-4

1.1.8 Rate Limiting ................................................................................... 1-4

1.1.9 Flow Control.................................................................................... 1-5

1.1.10 GARP Switch Operation ................................................................. 1-5

1.1.11 802.1 Port Priority ........................................................................... 1-6

1.1.12 Management ................................................................................... 1-6

1.1.13 Switching Options ........................................................................... 1-6

1.1.14 Optional HSIMs and VHSIMs.......................................................... 1-6

1.1.15 Standards Compatibility .................................................................. 1-7

1.1.16 Year 2000 Compliant ...................................................................... 1-7

1.1.17 LANVIEW Diagnostic LEDs ............................................................1-7

1.2 Getting Help .................................................................................................... 1-8

NETWORK REQUIREMENTS

2.1 SmartTrunk...................................................................................................... 2-1

2.2 10BASE-T Network......................................................................................... 2-1

2.3 100BASE-TX Network..................................................................................... 2-2

Contents vii

3

INSTALLATION

3.1 Unpacking the Device ..................................................................................... 3-1

3.2 Installing Options.............................................................................................3-2

3.3 Installing the Device ........................................................................................ 3-3

3.3.1 Tabletop or Shelf Installation ..........................................................3-3

3.3.2 Rackmount Installation.................................................................... 3-4

3.3.3 Connecting Power........................................................................... 3-8

3.4 Connecting to the Network.............................................................................. 3-9

3.4.1 Connecting Twisted Pair Cables to Fixed Ports.............................. 3-9

3.5 Completing the Installation............................................................................3-12

4

A

B

TROUBLESHOOTING

4.1 Using LANVIEW.............................................................................................. 4-1

4.2 Troubleshooting Checklist...............................................................................4-6

4.3 Using the RESET Button................................................................................. 4-9

SPECIFICATIONS

A.1 Device Specifications ......................................................................................A-1

A.2 Physical Properties .........................................................................................A-1

A.3 Electrical Specifications ..................................................................................A-2

A.4 Environmental Requirements ..........................................................................A-2

A.5 Input/Output Ports ...........................................................................................A-2

A.6 COM Port Pinout Assignments .......................................................................A-3

A.7 Regulatory Compliance...................................................................................A-3

OPTIONAL INSTALLATIONS AND
MODE SWITCH BANK SETTINGS

B.1 Required Tools................................................................................................B-1

B.2 Removing the Chassis Cover..........................................................................B-2

B.3 Setting the Mode Switches..............................................................................B-5

B.4 SIMM Upgrade ................................................................................................B-7

B.4.1 Locating SIMMs ..............................................................................B-7

B.4.2 Installing the DRAM SIMM..............................................................B-8

B.5 Installing Optional HSIM or VHSIM Interface Modules ...................................B-9

INDEX

viii Contents

Figures

Figure Page

1-1 The 2H252-25R SmartSwitch 2200................................................................................. 1-1

3-1 Tabletop or Shelf Installation ........................................................................................... 3-4

3-2 Attaching the Strain-Relief Bracket ................................................................................. 3-6

3-3 Attaching the Rackmount Brackets .................................................................................3-7

3-4 Installing the Device in a Rack ........................................................................................3-7

3-5 2H252-25R Rear View .................................................................................................... 3-8

3-6 Connecting the Twisted Pair Segment .......................................................................... 3-10

3-7 Schematic of Straight-Through and Crossover Cables .................................................3-11

4-1 LANVIEW LEDs .............................................................................................................. 4-2

4-2 RESET Button .................................................................................................................4-9

B-1 Removing the Chassis Cover......................................................................................... B-4

B-2 Mode Switch Location .................................................................................................... B-5

B-3 SIMM Slot Locations ...................................................................................................... B-7

B-4 Installing the DRAM........................................................................................................ B-8

B-5 HSIM and VHSIM Connector Locations ......................................................................... B-9

Figures ix

Tables

Ta bl e Page

3-1 Contents of 2H252-25R Carton ....................................................................................3-2

4-1 LANVIEW LEDs ............................................................................................................4-3

4-2 Troubleshooting Checklist.............................................................................................4-6

A-1 COM Port Pin Assignments ......................................................................................... A-3

x Ta bl e s

About This Guide

Welcome to the 2H252-25R SmartSwitch 2200 Installation User’s Guide. This guide describes
the 2H252-25R SmartSwitch 2200 device and provides information concerning network
requirements, installation, troubleshooting, and specifications.

Important Notice

Depending on the firmware version used in the 2H252-25R, some features described in this
document may not be supported. Refer to the Release Notes shipped with the 2H252-25R to
determine which features are supported.

USING THIS GUIDE

Read through this guide to completely understand the 2H252-25R capabilities and for the
instructions on how to install and troubleshoot the device. For information about how to use Local
Management to configure and manage the 2H252-25R, refer to the Enterasys Networks
SmartSwitch Series 2E253, 2H252, 2H253, and 2H258 Local Management User’s Guide.

A general working knowledge of Ethernet and IEEE 802.3 type data communications networks
and their physical layer components is helpful when using this device. In this document, the device
is referred to as either the “2H252-25R” or the “device”.

STRUCTURE OF THIS GUIDE

This guide is organized as follows:

Chapter 1, Introduction, provides an overview of the 2H252-25R and its features. Directions for

obtaining additional information or help from Enterasys Networks are also included in this
chapter.

Chapter 2, Network Requirements, explains the network requirements to consider before

installing the 2H252-25R.

Chapter 3, Installation, provides instructions on how to install and connect segments to the

2H252-25R.

Chapter 4, Troubleshooting, describes the function of the LANVIEW LEDs, which can help to

quickly diagnose network/operational problems.

About This Guide xi

Related Documents

Appendix A, Specifications, contains information on functionality and operating specifications,

connector pinouts, environmental requirements, and physical properties.

Appendix B, Optional Installations and Mode Switch Bank Settings, describes how to remove

the cover from the device, set the Mode Switch, and shows the location of an optional High Speed
Interface Module (HSIM) or Very High Speed Interface Module (VHSIM) when one is installed.

RELATED DOCUMENTS

The following Enterasys Networks documents may help to set up and manage the 2H252-25R:

• SmartSwitch Series 2E253, 2H252, 2H253, and 2H258 Local Management User’s Guide

• Ethernet Technology Guide

• Cabling Guide

• SmartTrunk User’s Guide

The following Enterasys Networks documents are associated with optional interface modules:

• HSIM-A6DP User’s Guide

• HSIM-F6 User’s Guide

• HSIM-FE6 User’s Guide

• HSIM-W6 Installation Guide

• HSIM-W84 Installation Guide

• WAN Series Local Management User’s Guide

• HSIM-W87 User’s Guide

• HSIM-G01/G09 User’s Guide

• VHSIM-G6 User’s Guide

• VHSIM-A6DP User’s Guide

The HSIM-W6 Installation Guide, the HSIM-W84 Installation Guide, and the

WAN Series Local

Management User’s Guide are included on the QuickSET CD-ROM and, along with the other

manuals listed above, can be obtained from the World Wide Web in Adobe Acrobat Portable
Document Format (PDF) at the following site:

http://www.enterasys.com

NOTE: All documentation for the Enterasys Networks SecureFast VLAN Manager
software is contained on the VLAN Manager CD-ROM.

xii About This Guide

DOCUMENT CONVENTIONS

The guide uses the following conventions:

NOTE: Calls the reader’s attention to any item of information that may be of special
importance.

TIP: Conveys helpful hints concerning procedures or actions.

CAUTION: Contains information essential to avoid damage to the equipment.

ELECTRICAL HAZARD: Warns against an action that could result in personal injury or

death due to an electrical hazard.

WARNING: Warns against an action that could result in personal injury or death.

Document Conventions

About This Guide xiii

1

Introduction

This chapter introduces the 2H252-25R SmartSwitch 2200 device and provides information about
how to obtain additional support from Enterasys Networks.

Important Notice

Depending on the firmware version used in the 2H252-25R, some features described in this
document may not be supported. Refer to the Release Notes shipped with the 2H258-17R to
determine which features are supported.

1.1 OVERVIEW

The 2H252-25R (Figure 1-1) is a high-performance Fast Ethernet switch that provides 24
auto-negotiating 10/100 BASE-TX ports via RJ45 Interfaces and one optional High Speed
Interface Module (HSIM) or Very High Speed Interface Module (VHSIM).

Figure 1-1 The 2H252-25R SmartSwitch 2200

LED MODE Switch

FAST ETHERNET WORKGROUP SWITCH

2H252-25R

Reset
Switch

RESET

COM

COM
Port

LED
MODE

RX-TX

DPX-SPD

2
1

PWR
CPU

System
LEDs

Port Status
LEDs

4

56789

3

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

10

16

12

15

11

131413

22

24

20

18

21

23

19

17

Network Ports 1-24

HSIM/VHSIM Slot

4005_00_01

Introduction 1-1

Overview

The 2H252-25R is used to connect individual high-bandwidth user devices, such as workstations,
or to provide a central switching point for multiple 100-Mbps Fast Ethernet segments. The
optional HSIMs provide high speed uplinks to networking technologies such as Fast Ethernet,
Gigabit Ethernet, Fiber Distributed Data Interface (FDDI), Wide Area Network (WAN), and
Asynchronous Transfer Mode (ATM). Some HSIMs can provide additional Fast Ethernet ports in
varying media types. The optional VHSIMs provide very high speed uplinks to networking
technologies such as Gigabit Ethernet and ATM.

The 2H252-25R ports can be configured to control frame traffic in several ways, including
prioritizing traffic flow according to protocol type. The 2H252-25R can also be configured to
establish Virtual Local Area Networks (VLANs) and control the flow of frames associated with
each VLAN according to priority and Ether type. Detailed information about VLANs is provided
in the SmartSwitch Series 2E253, 2H252, 2H253 and 2H258 Local Management User’s Guide.

The 2H252-25R may be used as a tabletop unit or can be installed in a standard 19-inch rack using
the supplied rack mounting hardware.

The 2H252-25R has two power supplies. The power supplies load share 50% (+/-5%) of the power
required by the device. If one power supply fails, the remaining power supply assumes the entire
load of the device without interruption to network traffic. Each power supply module supports its
own ac input connection, which enables each power supply to be connected to a different ac power
circuit.

1.1.1 Connectivity

The 2H252-25R connects to Ethernet networks or workstations through the auto-negotiating
10/100 BASE-FX ports on the front panel. The device also has a slot for an optional HSIM or
VHSIM to provide additional connectivity to various networking technologies.

1.1.2 Runtime IP Address Discovery

This feature enables the 2H252-25R device to automatically accept an IP address from a Boot
Strap Protocol (BootP) server on the network without requiring a user to enter an IP address
through Local Management.

When the device is connected to the network and powered up, Runtime IP Address Discovery
(RAD) checks the device for an IP address. If one has not yet been assigned (device IP address set
to 0.0.0.0), RAD checks to see if any of the device interfaces have a link. If so, RAD sends out
Reverse Address Resolution Protocol (RARP) and BootP requests to obtain an IP address from a
BootP server on the network.

1-2 Introduction

Overview

The RAD requests start at an interval of 1 per second. The interval then doubles after every
transmission until an interval of 300 seconds is reached. At this point, the interval remains at 300
seconds. The RAD requests continue until an IP address is received from a RARP or BootP server,
or an IP address is entered using Local Management.

NOTE: The 2H252-25R will reboot after RAD is successful.

1.1.3 Full Duplex Switched Ethernet

Each switched Fast Ethernet port on the 2H252-25R supports 100 Mbps operation, and can operate
in Full Duplex Switched Ethernet (FDSE) mode. FDSE enables each port to provide up to
200 Mbps of bandwidth to connected devices that support FDSE.

1.1.4 SmartTrunk

Traditional 802.1D Spanning Tree Bridges only allow one active data path between any two
switches; all other parallel data paths are in Standby or Blocking mode. If one interface or path
should fail, then the other interface automatically comes out of Blocking mode and forwards all of
the traffic. This is fine for redundancy purposes. However, it is not the most efficient use of
resources.

SmartTrunk, also referred to as SmartTrunking, is Enterasys Networks’ terminology for load
balancing or load sharing. SmartTrunk provides the ability to take full advantage of the network’s
redundant bandwidth. SmartTrunk divides network traffic across multiple ports in parallel to
provide additional throughput. The SmartTrunk application can be used with any of Enterasys
Networks’ switch modules (except ATM modules).

For more information about SmartTrunk and how to configure it the SmartSwitch device, refer to
the Enterasys Networks SmartTrunk User’s Guide.

Introduction 1-3

Overview

1.1.5 Remote Monitoring (RMON)

The 2H252-25R supports all nine Ethernet RMON groups. The Statistics, Alarms, Events and
History groups are enabled on all ports by default.

Enterasys Networks RMON Actions is a vendor-specific extension of RMON and provides the
ability to set an “Action” on any SNMP MIB variable. The Action can be triggered by any RMON
Event and/or Alarm. An example of an Action would be to turn off a MIB-2 interface if a
broadcast threshold is crossed.

1.1.6 Broadcast Suppression

Broadcast Suppression enables a user to set a desired limit of receive broadcast frames per port/per
second to be forwarded out the other ports on the device. Any broadcast frames above this
specified limit are dropped. In the event that broadcast frames are being suppressed, multicast and
unicast frames continue to be switched.

1.1.7 Port/VLAN Redirect Functions

The port redirect function, also referred to as “Port Mirroring,” is a troubleshooting tool used to
map traffic from a single source port to a single destination port within the device. This feature
allows frames, including those with errors, to be copied and sent to an analyzer or RMON probe.
The analyzer or RMON probe will see the data as if it were directly connected to the LAN segment
of the source port.

The VLAN redirect function is similar to the port redirect function except that the frames received
by the device are redirected to a designated destination port according to the VLAN classification
of the frames received. Multiple VLANs can be directed to the same destination port. The VLAN
redirect function is only supported when the device is operating as an 802.1Q switch.

1.1.8 Rate Limiting

The Rate Limiting feature enables the SmartSwitch device to have control over traffic rates on a
per-port, per-priority basis. The network administrator can configure a rate limit (from 100 kbps to
1 Gbps) for a given port with an associated list of IEEE 802.1p priorities (which can include one,
some, or all of the eight priority levels defined in 802.1p). Each rate limit is specified as an
inbound or an outbound limit. The combined rate of all traffic on the port that matches the listed
priorities cannot exceed the programmed limit. If the rate exceeds the defined limit, frames are
dropped until the rate falls below the limit.

1-4 Introduction

Overview

Administrators can configure up to four rate limit rules per port; however, each rule must not
include conflicting 802.1p priority values. In order to control traffic inbound and outbound on the
same port, two rate limit rules must be configured (one inbound and one outbound). Since the rate
limiting operation occurs after the processing of the multi-layer classification rules, the two
features can be combined to provide application-aware rate limiting.

NOTE: This traffic rate function is not supported on ports connected to SmartTrunk
port.

For more information about the application of Traffic Rate Policing, refer to SmartSwitch Series
2E253, 2H252, 2H253, and 2H258 Local Management User’s Guide.

1.1.9 Flow Control

Flow control is a method of managing the flow of frames between two devices. It ensures that a
transmitting device does not overwhelm a receiving device with data. This is accomplished by the
transmitting device pausing its transmission while the receiving device processes the frames
already received.

The 2H252-25R supports the following two types of flow control:

• Frame based 802.3x

• Back pressure

Frame based 802.3x flow control is supported on all Ethernet ports operating in the full duplex
mode. Flow control can be enabled or disabled on a port-by-port basis.

Back pressure flow control is supported on all Ethernet ports operating in the standard mode of
operation. Flow control can be enabled or disabled on a port-by-port basis.

1.1.10 GARP Switch Operation

Some or all ports on the switch may be activated to operate under the Generic Attribute
Registration Protocol (GARP) applications, GARP VLAN Registration Protocol (GVRP) and/or
GARP Multicast Registration Protocol (GMRP).

GARP is a protocol, or set of rules, that outlines a mechanism for propagating the port state and/or
user information throughout a bridged LAN to keep track of users and VLANs on the network
fabric. MAC bridges and end users alike can take part in the registration and de-registration of
GARP attributes such as VLAN and multicast group membership. For more details on how GVRP
and GMRP handle frames under GARP, and how to configure the switch ports to take advantage of
this operation, refer to SmartSwitch Series 2E253, 2H252, 2H253 and 2H258 Local Management
User’s Guide.

Introduction 1-5

Overview

1.1.11 802.1 Port Priority

The 802.1 port priority is used to assign a default priority to the frames received without priority
information in their tag header, map prioritized frames to the appropriate transmit queues, and
prioritize frames according to protocol type. The 802.1 port priority is part of the IEEE 802.1D
standard.

1.1.12 Management

Management of the 2H252-25R is accomplished using SNMP compliant management tools for
in-band Local Management. Out-of-band Local Management is provided through the RJ45 COM
port on the front panel using a VT100 terminal or a VT100 terminal emulator. In-band remote
management is possible through any SNMP compliant Network Management Software.

Local Management described in the SmartSwitch Series 2E253, 2H252, 2H253 and 2H258 Local
Management User’s Guide provides the ability to manage the 2H252-25R, and optional HSIMs
and VHSIMs that support Ethernet. For information about Local Management for optional
non-Ethernet HSIMs or VHSIMs, refer to their respective user’s guide.

1.1.13 Switching Options

The 2H252-25R provides 802.1Q switching or SecureFast Switching Virtual Network Services
between all of the front panel interfaces including the optional HSIM or VHSIM interface. In the

802.1Q mode (the default mode of operation), the 2H252-25R functions as an 802.1D switch until
VLANs are configured.

IEEE 802.1Q switching and SecureFast switching allow migration to Virtual Network
technologies without requiring the replacement of existing equipment.

1.1.14 Optional HSIMs and VHSIMs

Optional HSIMs and VHSIMs are available from Enterasys Networks for additional connectivity
to various networking technologies. The HSIMs and VHSIMs available for the 2H252-25R are
listed in the Release Notes shipped with the device.

1-6 Introduction

Overview

1.1.15 Standards Compatibility

The 2H252-25R is fully compliant with the IEEE 802.3, 802.3u, 802.3x, 802.1D, and 802.1Q
standards. The 2H252-25R provides IEEE 802.1D Spanning Tree Algorithm (STA) support to
enhance the overall reliability of the network and protect against “loop” conditions. The
2H252-25R supports a wide variety of industry standard MIBs including RFC 1213 (MIB II),
RFC 1757 (RMON), RFC 1493 (Bridge MIB), RFC 1354 (FIB MIB), and RFC 1190 (Path MTU
Discovery). A full suite of Enterasys Networks Enterprise MIBs provide a wide array of statistical
information to enhance troubleshooting. For information on how to extract and compile individual
MIBs, contact Enterasys Networks.

1.1.16 Year 2000 Compliant

The 2H252-25R has an internal clock that can maintain the current time and date beyond the year

1999.

1.1.17 LANVIEW Diagnostic LEDs

LANVIEW diagnostic LEDs serve as an important troubleshooting aid by providing an easy way
to observe the status of individual ports and overall network operations.

Introduction 1-7

Getting Help

1.2 GETTING HELP

For additional support related to the 2H252-25R or this document, contact Enterasys Networks
using one of the following methods:

World Wide Web http://www.enterasys.com/

Phone [phone]

Internet mail [e-mail]

FTP ftp://ftp.enterasys.com

Login anonymous
Password your email address

To send comments or suggestions concerning this document, contact the Technical Writing
Department via the following email address: [e-mail]

Make sure to include the document Part Number in the email message.

Before contacting Enterasys Networks for technical support, have the following information
ready:

• Your Enterasys Networks service contract number

• A description of the failure

• A description of any action(s) already taken to resolve the problem (e.g., changing mode

switches, rebooting the unit, etc.)

• The serial and revision numbers of all involved Enterasys Networks products in the network

• A description of your network environment (layout, cable type, etc.)

• Network load and frame size at the time of trouble (if known)

• The device history (i.e., have you returned the device before, is this a recurring problem, etc.)

• Any previous Return Material Authorization (RMA) numbers

1-8 Introduction

2

Network Requirements

Before installing the 2H252-25R, review the requirements and specifications referred to in this
chapter concerning the following:

• SmartTrunk (Section 2.1)

• 10BASE-T Twisted Pair Network (Section 2.2)

• 100BASE-TX Twisted Pair Network (Section 2.3)

The network installation must meet the requirements to ensure satisfactory performance of this
equipment. Failure to do so will produce poor network performance.

NOTE: The Enterasys Networks SmartTrunk User’s Guide and Cabling Guide referred
to in the following sections can be found on the Enterasys Networks World Wide Web
site:http://www.enterasys.com

2.1 SmartTrunk

To connect the 2H252-25R to a network so it can take advantage of the SmartTrunk feature, there
are certain rules concerning port connections and configurations that must be followed for proper
operation. Refer to the Enterasys Networks SmartTrunk User’s Guide for additional information.

2.2 10BASE-T NETWORK

When connecting a 10BASE-T segment to any of the 2H252-25R ports (1 through 24), ensure that
the network meets the Ethernet network requirements of the IEEE 802.3 standard for 10BASE-T.
The ports support Category 3 UTP cabling when connected to a 10BASE-T segment. Refer to the
Enterasys Networks Cabling Guide for details.

NOTE: If a port is to operate at 10 and 100 Mbps, Category 5 cabling must be used.
Refer to Section 2.3 for information about 100BASE-TX networks and cabling.

Network Requirements 2-1

100BASE-TX Network

2.3 100BASE-TX NETWORK

The fixed ports (ports 1 through 24) of the 2H252-25R provide an RJ45 connection that supports
Category 5 UTP cabling. The device at the other end of the twisted pair segment must meet IEEE

802.3u 100BASE-TX Fast Ethernet network requirements for the devices to operate at 100 Mbps.
Refer to the Enterasys Networks Cabling Guide for details.

NOTE: The fixed ports of the 2H252-25R support Category 5 UTP cabling that has an
impedance between 85 and 111 ohms.

The

2H252-25R is capable of operating at either 10 or 100 Mbps. When the port is

configured for Auto-Negotiation, the 2H252-25R automatically senses the speed of the
other device and adjusts its speed accordingly.

2-2 Network Requirements

3

Installation

ELECTRICAL HAZARD: Only qualified personnel should install the 2H252-25R.

NOTE: Read the Release Notes shipped with the device to check for any exceptions to

the supported features and operation documented in this guide.

This chapter provides the instructions required to install the 2H252-25R. A Phillips screwdriver is
required to install options into the device or install the device into a rack. Follow the order of the
sections listed below to correctly install the device.

• Unpacking the Device (Section 3.1)

• Installing Options (Section 3.2)

• Installing the Device (on a shelf or tabletop, or into a standard rack) (Section 3.3)

• Connecting to the Network (Section 3.4)

• Completing the Installation (Section 3.5)

3.1 UNPACKING THE DEVICE

Unpack the device as follows:

1. Open the box and remove the packing material protecting the 2H252-25R.

2. Verify the contents of the carton as listed in Table 3-1.

Installation 3-1

Installing Options

Table 3-1 Contents of 2H252-25R Carton

Item Quantity

2H252-25R 1

Antistatic Wrist Strap 1

Console Cable Kit 1

Rackmount Kit 1

Strain-Relief Bracket 1

Manual Accessory Kit 1

Power Cord 2

3. Remove the tape seal on the non-conductive bag to remove the 2H252-25R.

4. Perform a visual inspection of the device for any signs of physical damage, and contact

Enterasys Networks if there are any signs of damage. Refer to Section 1.2 for details.

3.2 INSTALLING OPTIONS

NOTE: Install any optional equipment before proceeding to Section 3.3.

If the 2H252-25R is to be installed with an optional HSIM or VHSIM, refer to the user’s guide of
that device for the installation instructions.

3-2 Installation

Installing the Device

3.3 INSTALLING THE DEVICE

The 2H252-25R may be installed on a tabletop, shelf, or in a 19-inch rack. Section 3.3.1 describes
a tabletop or shelf installation and Section 3.3.2 describes the rackmount installation.

ELECTRICAL HAZARD: To prevent possible personal injury and/or damage to the unit,
do NOT connect power to the 2H252-25R until instructed to do so.

3.3.1 Tabletop or Shelf Installation

The following two subsections provide guidelines for installation on a tabletop or shelf.

Guidelines for Tabletop and Shelf Installations

Tabletop and shelf installations must be within reach of the network cabling and meet the
requirements listed below:

• Locate the 2H252-25R within seven feet of an appropriately grounded power receptacle that

meets the power supply requirements listed in Appendix A.

• In a shelf installation, the shelf must support 13.5 kg (30 lb) of static weight for each

2H252-25R.

• Maintain a temperature of between 5°C (41°F) and 40°C (104°F) at the installation site with

fluctuations of less than 10°C (18°F) per hour.

• Maintain a 2-inch clearance from the left, right, and rear sides of the device to provide adequate

ventilation.

Installation

For a tabletop or shelf installation, locate the 2H252-25R within seven feet of its power source and
on an unrestricted free surface area as shown in Figure 3-1. Proceed to Section 3.3.3 for power
connection instructions.

CAUTION: To ensure proper ventilation and prevent overheating, leave a minimum
clearance space of 5.1 cm (2.0 in) at the left, right, and rear of the 2H252-25R.

Installation 3-3

Installing the Device

Figure 3-1 Tabletop or Shelf Installation

B

C

A

A = 15 cm (6 in)

FAST ETHERNET WORKGROUP SWITCH

2H252-25R

LED
MODE

RX-TX

DPX-SPD

RESET

COM

2

4

1

3

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

PWR
CPU

12

14

11

567891015

13

22

16

24

20

18

21

23

19

17

D

B = 57 cm (22.5 in)
C = 53 cm (21 in)
D = 213 cm (7 ft)

4005_00_02

3.3.2 Rackmount Installation

To install the 2H252-25R in a 19-inch rack, Enterasys Networks includes a strain-relief bracket for
cable management and an accessory kit containing the rackmount brackets, and mounting screws
to attach the rackmount brackets and strain-relief bracket.

Guidelines for the Rackmount Installation

The installation site must be within reach of the network cabling and meet the requirements listed
below:

• An appropriate grounded power receptacle must be located within seven feet of the location.

• Maintain a temperature of between 5°C (41°F) and 40°C (104°F) at the installation site with

fluctuations of less than 10°C (18°F) per hour.

3-4 Installation

Installing the Device

CAUTION: To ensure proper ventilation and prevent overheating, leave a minimum
clearance space of 5.1 cm (2.0 in) at the left, right, and rear of the 2H252-25R.

WARNING: Before installing the 2H252-25R into a rack, ensure that the rack supports
the device(s) without compromising the stability of the rack. Otherwise, personal injury
and/or equipment damage may result.

Installation

Rack mounting the 2H252-25R involves the following:

• Attaching the strain-relief bracket

• Rack mounting the 2H252-25R (attaching the mounting brackets and fastening the device to the
rack)

Attaching the Strain-Relief Bracket

Attach the strain-relief bracket to the 2H252-25R as follows:

1. Locate the strain-relief bracket and four 8-32 x 5/16-inch pan-head screws in the rackmount kit.

CAUTION: Do not attempt to attach the strain-relief bracket with screws other than the
8-32 x 5/16-inch screws included with the 2H252-25R. Use of longer screws may
damage the unit.

2. Place the 2H252-25R upside down (as shown in Figure 3-2) on a clean flat surface. Then attach

the strain-relief bracket to the bottom of the 2H252-25R using the four 8-32 x 5/16-inch
pan-head screws.

Installation 3-5

Installing the Device

Figure 3-2 Attaching the Strain-Relief Bracket

Strain-Relief
Bracket Screws

Strain-Relief
Bracket

CPU
PWR

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

17

23
24

15

19

21

20

22

11

13
14

18

16

12

3

1

56789

4

2

10

COM

2H252-25R

RESET

DPX-SPD

RX-TX

MODE
LED

FAST ETHERNET WORKGROUP SWITCH

4005_00_03

Rack Mounting the 2H252-25R

Proceed as follows to install the 2H252-25R into a 19-inch rack:

1. There are several mounting holes in the rackmount brackets and the bottom of the chassis so that

each mounting bracket may be adjusted forward or backward to mount the device further into,
or out of the rack, depending on the installation requirements. Position the rackmount brackets
over the appropriate holes.

CAUTION: Do not attempt to attach the rackmount brackets with screws other than the

6-32 x 1/4-inch flathead screws shipped with the 2H252-25R. Use of longer screws may

damage the unit.

2. Locate the four 6-32 x 1/4-inch flathead screws in the rackmount kit. Use these screws to attach

the rackmount brackets to the bottom of the 2H252-25R as shown in Figure 3-3.

3-6 Installation

Figure 3-3 Attaching the Rackmount Brackets

Rackmount Bracket

CONSOLE

17

23
24

15

19

21

18

16

20

22

TELCO

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

3

1

56789

11

13
14

12

4

2

10

Installing the Device

Rackmount Bracket Screws

(Use only 6-32 x 1/4-inch flathead screws)

COM

CPU
PWR

2H252-25R

RESET

DPX-SPD

RX-TX

MODE
LED

FAST ETHERNET WORKGROUP SWITCH

4005-00-04

3. With the mounting brackets attached, position the 2H252-25R between the vertical frame

members of the 19-inch rack and fasten it securely with mounting screws as shown in

Figure 3-4.

Figure 3-4 Installing the Device in a Rack

FAST ETHERNET WORKGROUP SWITCH

DPX-SPD

RESET

2H252-25R

COM

2

LED

1

MODE

RX-TX

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

PWR
CPU

4

567891015

3

12
11

22

16

20

14
13

24

18

21

19

23

17

Screws

19-Inch Rack

4005_00_05

Installation 3-7

Installing the Device

3.3.3 Connecting Power

NOTE: The two power supplies in the 2H252-25R have automatic voltage sensing that

allows connection to power sources ranging from 100–125 Vac, 2.5 A or 200–240 Vac,

1.25 A, 50/60 Hz.

To connect the 2H252-25R to the power sources, proceed as follows:

1. Plug each power cord into a grounded wall outlet, see Figure 3-5. To take advantage of the load

sharing and redundancy capabilities, each power cord must be plugged into a separate dedicated
ac outlet. The Power (PWR) LED turns ON (green) and the CPU LED alternates between green
and amber during boot up. It takes approximately one minute for the 2H252-25R to boot up.

NOTE: If the power-up sequence is interrupted on this device, or if optional hardware
has been installed or removed, this device may run an extended diagnostics sequence
that may take up to five minutes to complete.

Figure 3-5 2H252-25R Rear View

Primary

Redundant

AC outlets are
on separate circuits

2. Observe the LANVIEW LEDs. After a successful boot, the PWR LED turns ON (green). If the

PWR LED is amber, there is no power redundancy. Check the power cord connections and the
power source. If there are no problems with the power cord connections or power source and the
PWR LED is still amber, contact Enterasys Networks for help. Refer to Section 1.2 for details.

3-8 Installation

25041-06

Connecting to the Network

3.4 CONNECTING TO THE NETWORK

This section provides the procedures for connecting unshielded twisted pair (UTP) and fiber optic
segments from the network or other devices to the 2H252-25R.

NOTE: If the 2H252-25R is being installed in a network using SmartTrunking, there are
rules concerning the network cable and port configurations that must be followed for
SmartTrunking to operate properly. Before connecting the cables, refer to the Enterasys
Networks SmartTrunk User’s Guide for the configuration information.

3.4.1 Connecting Twisted Pair Cables to Fixed Ports

NOTE: If a port is connected to a 10-Mbps segment, Category 3 Unshielded Twisted

Pair (UTP) cable is sufficient to use. However, if the segment is to carry 10- or
100-Mbps transmissions, use only Category 5 UTP cabling that has an impedance
between 85 and 111 ohms.

Ports 1 through 24 on the 2H252-25R are 10/100 ports with internal crossovers. When connecting
a workstation, use a straight-through cable. When connecting networking devices, such as another
bridge, repeater, or router, use a crossover cable.

To connect a twisted pair segment to the 2H252-25R, proceed as follows:

1. Ensure that the device connected to the other end of the segment is powered ON.

2. Connect the twisted pair segment to the 2H252-25R by inserting the RJ45 connector on the

twisted pair segment into the appropriate RJ45 port on the device. Figure 3-6 shows a twisted
pair segment being plugged into port 7.

Installation 3-9

Connecting to the Network

Figure 3-6 Connecting the Twisted Pair Segment

Receive (RX)

LED

LED
MODE

RX-TX

DPX-SPD

MODE

RX-TX

DPX-SPD

4

2

3

1

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X

PWR
CPU

Transmit (TX)

8

6

7

5

Port

LED MODE Switch
in RXTX position

FAST ETHERNET WORKGROUP SWITCH

2H252-25R

LED MODE Switch

RESET

COM

12

10

11

9

15

13

19

17

16

14

23

21

24X

24

22

20

18

Twisted Pair Cable

4005_00_07

3. Verify that a link exists by checking that the port RX LED is on (flashing amber, blinking green,
or solid green). If the RX LED is off and the TX LED is not blinking amber, perform the
following steps until it is on:

a. Verify that the LED switch located near the COM port of the device is in the left-most

position (RX and TX LED indicators).

b. Verify that the UTP cabling used is Category 3 (for 10BASE-T) or Category 5 (for

10BASE-T or 100BASE-TX). The Category 5 cabling must have an impedance of between
85 and 111 ohms.

NOTE: If a port is to operate at 10 and 100 Mbps, Category 5 cabling must be used.
Refer to Section 2.3 for information about 100BASE-TX networks and cabling.

c. Verify that the 100BASE-TX device at the other end of the twisted pair segment is powered

up.

d. Verify that the RJ45 connector on the twisted pair segment has the proper pinouts.

Depending on what device is connected to the 2H252-25R, a straight-through or crossover
cable may be used. Figure 3-7 shows the wiring for both types of cables.

e. Check the cable for continuity.

3-10 Installation

Figure 3-7 Schematic of Straight-Through and Crossover Cables

Straight-Through Cable

TO

SmartSwitch RJ45 Port

RX+

1

RX 2

10BASE-T or 100BASE-TX

TO

Device Port

Connecting to the Network

RX+

1

RX

2

TX+

3

TX

6

NOTE:

TX+

TX

3

6

RJ45 to RJ45

RX+/RX and TX+/TX
must share a common
color pair.

SmartSwitch RJ45 Port

RX+

RX 2

TX+

TX

Crossover Cable

TO

1

3

6

RJ45 to RJ45

10BASE-T or 100BASE-TX

TO

Device Port

1

2

TX+

3

TX

6

RX+

RX

25041-08

4. Verify that a link exists by checking that the port RX LED is on (flashing amber, blinking green,
or solid green). If the RX LED is off and the TX LED is not blinking amber, perform the
following steps until it is on:

a. Verify that the device at the other end of the twisted pair segment is powered up.

b. Verify that the RJ45 connector on the twisted pair segment has the proper pinouts.

c. Check the cable for continuity.

d. Make sure that the twisted pair connection meets the db loss and cable specifications outlined

in Section 2.3.

e. If a link is not established, contact Enterasys Networks. Refer to Section 1.2 for details.

5. Repeat steps 1 through 4 for each connection until all connections have been verified.

Installation 3-11

Completing the Installation

3.5 COMPLETING THE INSTALLATION

After installing the 2H252-25R and any optional HSIM or VHSIM, and making the connections to
the network, proceed as follows:

1. Secure the cables by running the cables along the strain-relief bracket and tying them to the

strain-relief bracket using cable ties.

2. The 2H252-25R is now ready to be configured through Local Management. Refer to the

SmartSwitch Series 2E253, 2H252, 2H253 and 2H258 Local Management User’s Guide for
information on how to access and use Local Management.

3-12 Installation

4

Troubleshooting

This chapter provides information concerning the following:

• Using LANVIEW (Section 4.1)

• Troubleshooting Checklist (Section 4.2)

• Using the RESET Button (Section 4.3)

4.1 USING LANVIEW

The 2H252-25R uses Enterasys Networks’ built-in visual diagnostic and status monitoring system
called LANVIEW. The LANVIEW LEDs (Figure 4-1) allow quick observation of the network
status to aid in diagnosing network problems.

Troubleshooting 4-1

Using LANVIEW

Figure 4-1 LANVIEW LEDs

LED
MODE

RX-TX

A

DPX-SPD

FAST ETHERNET WORKGROUP SWITCH

LED
MODE

RX-TX

DPX-SPD

2H252-25R

RESET

COM

PWR

Receive (RX)

B

14
13

DPX-SPD

Transmit (TX)

2

4

1

3

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

PWR
CPU

567

8

12

10

11

9

CPU

Full Duplex Status

LED
MODE

RX-TX

16

18

15

17

Speed Status

22

20
19

24

21

23

LED functions when LED MODE switch is in the RX-TX position. This is the

A

default switch setting.

LED functions when LED MODE switch is in the DPX-SPD position.

B

4005_00_09

The LED MODE switch is located on the front panel of the 2H252-25R as shown in Figure 4-1.
This switch enables the user to change the function of the port LEDs. When the LED MODE
switch is moved to the left, the LEDs indicate the receive (RX) and transmit (TX) status of the
respective fixed ports (ports 1 through 24). When the LED MODE switch is moved to the right, the
port LEDs indicate whether the respective ports are operating in the standard or full duplex mode
(FDX) and if their operating speed (SPD) is 10 or 100 Mbps.

NOTE: The LED mode switch does not change the function of any LEDs on an installed
HSIM or VHSIM.

4-2 Troubleshooting

Using LANVIEW

Tabl e 4-1 describes the LED indications and provides recommended actions as appropriate.

Refer to the HSIM or VHSIM user’s guide for a description of the HSIM or VHSIM LED
indications.

NOTE: The terms flashing, blinking, and solid used in Ta bl e 4- 1 indicate the
following:

Flashing indicates an LED is flashing randomly.
Blinking indicates an LED is flashing at a steady rate (approximately 50% on, 50% off).
Solid indicates a steady LED light. No pulsing.

Table 4-1 LANVIEW LEDs

LED Color State Recommended Action

PWR Off Device electronics not

receiving power from power
supply(ies).

Green Functional. Power

supply(ies) operating
normally.

Amber Indicates loss of power

supply redundancy.

1. Ensure that the power cords are
plugged in correctly and that
there is power at the power
source.

2. Contact Enterasys Networks for
assistance.

None.

1. Ensure that the power cords are
plugged in correctly and that
there is power at the power
source.

2. Contact Enterasys Networks for
assistance.

Troubleshooting 4-3

Using LANVIEW

Table 4-1 LANVIEW LEDs (Continued)

LED Color State Recommended Action

CPU Off Power off. Power up device.

Red Blinking. Hardware failure

has occurred.

Solid. Resetting, normal
power up reset.

Contact Enterasys Networks for
assistance.

If the LED remains Red for several
minutes, contact Enterasys
Networks for assistance.

Amber Blinking. Crippled. Contact Enterasys Networks for

assistance.

Solid. Testing. If the LED remains Amber for

several minutes, contact Enterasys
Networks for assistance.

Green Solid. Functional. None.

Amber
and

Booting. Blinks amber and
green while booting.

None.

Green

The following port RX and TX LED indications are only valid when the LED MODE switch is
in the RX-TX position.

RX

Off No link. None.

(Receive)

Green Solid. Port enabled, link, no

None.

activity.

Amber Flashing. Port enabled, link,

Red Diagnostic failure. Contact Enterasys Networks for

4-4 Troubleshooting

Blinking. Port disabled,
link.

activity.

None.

None.

assistance.

Table 4-1 LANVIEW LEDs (Continued)

LED Color State Recommended Action

Using LANVIEW

TX
(Transmit)

Off Port enabled, and no

activity.

Should flash green every
two seconds indicating
BPDUs being sent if STA is
enabled and there is a valid
link.

Green Flashing. Indicates activity.

Rate indicates data rate.

Amber Blinking. Port in standby.

Port may be disabled due to
Spanning Tree.

Red Flashing. Indicates collision

rate.

Solid. Diagnostic failure. Contact Enterasys Networks for

1. Ensure that the STA is enabled
and that there is a valid link.

2. Contact Enterasys Networks for
assistance.

None.

1. Ensure that the port is not
disabled.

2. Contact Enterasys Networks for
assistance.

None, unless there is a large
amount of activity. In this case,
check for network configuration
problems or a defective device.

assistance.

The following port DPX and SPD LED indications are only valid when the LED MODE switch
is in the DPX-SPD position.

FDX

(Full
Duplex
Status)

Amber Port is operating in standard

mode (10 Mbps or
100 Mbps).

Green Port is operating in full

None.

None.
duplex mode (20 Mbps or
200 Mbps).

SPD (Speed
Status)

Amber There is a link and the port

is operating at 10 Mbps.

Green There is a link and the port

None.

None.
is operating at 100 Mbps.

Troubleshooting 4-5

Troubleshooting Checklist

4.2 TROUBLESHOOTING CHECKLIST

If the 2H252-25R is not working properly, refer to Tab le 4- 2 for a checklist of possible problems,
causes, and recommended actions to resolve the problem.

Table 4-2 Troubleshooting Checklist

Problem Possible Cause Recommended Action

All LEDs are OFF. Loss of power. Check for proper connection of the

power cable and its access to a live
outlet.

Installed improperly. Ensure that the 2H252-25R was

installed properly according to the
installation instructions in

Chapter 3.

No Local Management
Password screen.

Autobaud is enabled, but the
baud rate has not yet been

Press ENTER (RETURN) (may
take up to four times).

detected.

Terminal setup is not correct. Refer to the SmartSwitch Series

2E253, 2H252, 2H253 and 2H258
Local Management User’s Guide

for proper setup procedures.

Improper console cable
pinouts.

Corrupt firmware image, or
hardware fault.

Refer to Appendix A for proper
console port pinouts.

If possible, attempt to download
the image to the 2H252-25R again.
Refer to Section B.3 for
instructions to clear NVRAM.

4-6 Troubleshooting

Troubleshooting Checklist

Table 4-2 Troubleshooting Checklist (Continued)

Problem Possible Cause Recommended Action

Cannot navigate beyond
Password screen.

Cannot contact the
2H252-25R through
in-band management.

Improper Community Names
Table .

1. Refer to the SmartSwitch Series

2E253, 2H252, 2H253 and
2H258 Local Management
User’s Guide for Community

Names Table setup.

2. If you have forgotten the
Community Names, refer to

Appendix B for instructions on

how to set the mode switch to
reset the Community Names to
their default values.

IP address not assigned. Refer to the SmartSwitch Series

2E253, 2H252, 2H253 and 2H258
Local Management User’s Guide

for IP address assignment
procedure.

Port is disabled. Enable the port. Refer to the

SmartSwitch Series 2E253, 2H252,
2H253 and 2H258 Local
Management User’s Guide for the

instructions to enable/disable ports.

No link to device. 1. Verify that all network

connections between the network
management station and the
2H252-25R are valid and
operating.

2. If the problem continues, contact
Enterasys Networks for
assistance.

Troubleshooting 4-7

Troubleshooting Checklist

Table 4-2 Troubleshooting Checklist (Continued)

Problem Possible Cause Recommended Action

Port(s) goes into
standby for no apparent
reason.

User parameters (IP
address, Device and
Module name, etc.)
were lost when the
2H252-25R power was
cycled or the front panel
RESET button was
pressed.

Loop condition detected. 1. Verify that Spanning Tree is

enabled. Refer to the

SmartSwitch Series 2E253,
2H252, 2H253 and 2H258 Local
Management User’s Guide for

the instructions to set the type of
STA.

2. Review network design and
delete unnecessary loops.

3. If the problem continues, contact
Enterasys Networks for
assistance.

1. Position of Mode switch
(7), NVRAM Reset, was
changed sometime before
either cycling power or
pressing the RESET button,
causing the user-entered
parameters to reset to
factory default settings.

2. Clear NVRAM was set
through Local
Management.

1. Reenter the lost parameters as
necessary. Refer to the

SmartSwitch Series 2E253,
2H252, 2H253 and 2H258 Local
Management User’s Guide for

the instructions to configure the
device through Local
Management.

2. If the problem continues, contact
Enterasys Networks for
assistance.

4-8 Troubleshooting

Using the RESET Button

4.3 USING THE RESET BUTTON

The RESET button shown in Figure 4-2 resets and re-initializes the 2H252-25R.

CAUTION: Pressing the RESET button resets the device, and all current switching
being performed by the device is halted. A network downtime of up to two minutes will
result from this action.

Figure 4-2 RESET Button

FAST ETHERNET WORKGROUP SWITCH

LED
MODE

RX-TX

DPX-SPD

PWR
CPU

2H252-25R

RESET

COM

RESET Button

2

4

1

3

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

567

8

10

12

9

11

16

14
13

18

15

17

22

20
19

24

21

23

4005_00_10

To reset the 2H252-25R processor, press and release the RESET button. The 2H252-25R goes
through a reset process for approximately 60 seconds. Additional downtime may result as the
device reenters the network.

NOTE: It is not recommended to press the RESET button while the device is already in
reset mode. If so, the device will enter an extended diagnostic procedure, which is
unnecessary for normal operation. This extended diagnostic procedure takes much
longer than a minute.

Troubleshooting 4-9

A

Specifications

This appendix provides operating specifications for the Enterasys Networks 2H252-25R.
Enterasys Networks reserves the right to change these specifications at any time without notice.

A.1 DEVICE SPECIFICATIONS

Processors: Intel i960 RISC processor

Power PC

Dynamic Random Access
Memory (DRAM): 20 MB expandable to 32 MB

FLASH Memory: 8 MB

Shared Memory: 4 MB

A.2 PHYSICAL PROPERTIES

Dimensions: 7.11H x 43.18W x 46.99D (cm)

2.8H x 17W x 18.5D (in)

Approximate Weight (Unit): 8.18 kg (18 lb)

MTBF (Predicted): 200,000 hours

Specifications A-1

Electrical Specifications

A.3 ELECTRICAL SPECIFICATIONS

Line Input Range, Volts (V) 100–125 Vac 200–240 Vac

Input Current, Amperes (A) 2.3 A 1.2 A

Frequency, Hertz (Hz) 50/60 Hz 50/60 Hz

Input Power, Volt Amperes (VA) 250 VA 250 VA

A.4 ENVIRONMENTAL REQUIREMENTS

Operating Temperature: 5°C to 40°C (41°F to 104°F)

Storage Temperature: -30°C to 73°C (-22°F to 164°F)

Operating Relative Humidity: 5% to 90% (non-condensing)

A.5 INPUT/OUTPUT PORTS

Ports 1 through 24: Fast Ethernet 10/100 Mbps (10BASE-T and

100BASE-TX compliant) with RJ45 type
connectors.

Interface Slot: Slot accepts optional High Speed Interface Module

(HSIM) or Very High Speed Interface Module
(VHSIM) to provide a variety of cabling
connections.

A-2 Specifications

COM Port Pinout Assignments

A.6 COM PORT PINOUT ASSIGNMENTS

The COM port is a serial communications port that supports Local Management or connection to a
UPS.

Tabl e A-1 shows the COM port pin assignments.

Table A-1 COM Port Pin Assignments

Pin Signal Name Input/Output

1 Transmit Data (XMT) Output

2 Data Carrier Detect (DCD) Output

3 Data Set Ready (DSR) Input

4 Receive Data (RCV) Input

5 Signal Ground (GND) NA

6 Data Terminal Ready (DTR) Output

7 Request to Send (RTS) Input

8 Clear to Send (CTS) NA

A.7 REGULATORY COMPLIANCE

This equipment meets the following safety and electromagnetic compatibility (EMC)
requirements:

Safety: UL 1950, CSA C22.2 No 950, 73/23/EEC, EN 60950,

IEC 950

Electromagnetic
Compatibility (EMC):

FCC Part 15, CSA C108.8, 89/336/EEC, EN 55022,
EN 61000-3-2, EN 61000-3-3, EN 50082-1,
AS/NZS 3548, VCCI V-3

Specifications A-3

B

Optional Installations and

Mode Switch Bank Settings

ELECTRICAL HAZARD: ONLY QUALIFIED SERVICE PERSONNEL SHOULD

ATTEMPT THE FOLLOWING PROCEDURES.
NUR QUALIFIEZIERTE SERVICE PERSONNAL DIE FOLGENDE PROCEDURE

FOLGEN SOLLTEN.
SOLAMENTE PERSONAL CALIFICADO DEBE INTENTAR ESTE PROCEDIMIENTO.

The top cover must be removed to gain access to the mode bank switches, to install optional
FLASH or DRAM Single In-line Memory Modules (SIMMs), or to install an optional High Speed
Interface Module (HSIM) or Very High Speed Interface Module (VHSIM).

This appendix covers the following items:

• Required tools (Section B.1)

• Removing the chassis cover (Section B.2)

• Locations, functions, and settings for the mode switches (Section B.3)

• Installing optional SIMM upgrades (Section B.4)

• Location of Optional HSIMs (Section B.5)

B.1 REQUIRED TOOLS

Use the following tools to perform the procedures provided in this appendix:

• Antistatic wrist strap

• Phillips screwdriver

Optional Installations and Mode Switch Bank Settings B-1

Removing the Chassis Cover

B.2 REMOVING THE CHASSIS COVER

This section describes how to remove the 2H252-25R chassis cover.

DO NOT REMOVE THE COVER FROM THE 2H252-25R WHILE POWER IS APPLIED
TO THE UNIT. HAZARDOUS VOLTAGES ARE PRESENT AND COULD CAUSE
PERSONAL INJURY AND/OR DAMAGE THE UNIT.

DO NOT POWER UP THE 2H252-25R AGAIN UNTIL THE COVER AND SCREWS
ARE IN PLACE.

DECKEL VON DAS 2H252-25R NICHT ABZIEHEN UNTER SPANNUNG. GEFAHR
FÜR DAS PERSONNAL UND/ODER DAS GERÄT WEGEN GEFÄHRLICHE
SPANNUNGEN ENSTEHT.

2H252-25R NICHEINSCHALTEN SO LANG DER DECKEL UND SCHRAUBEN NICHT
EINGEBAUT SIND.

NO DEBE DE REMOVER LA TAPA DURENTE QUE ESTE CONELTADO A LA
CORRIENTE, UNA DESCARGA ELECTRICA LE PUEDE CAUSAR Y PROBOCARLE
DA

ÑOS, AL IGUAL QUE AL APARATO.

NO ENCHUFE A LA CORRIENTE HASTA QUE LA TAPA Y LOS TORNILLOS ESTEN
EN SU LUGAR.

CAUTION: THIS UNIT MAY HAVE MORE THAN ONE POWER SUPPLY CORD.
DISCONNECT TWO POWER SUPPLY CORDS BEFORE SERVICING TO AVOID
ELECTRIC SHOCK.

VORSICHT: DIESES GERÄT HAT MEHR ALS EINEN NETZANSCHLUß. TRENNEN
SIE VOR WARTUNGSARBEITEN DIE 2 NET ZANSCHLÜSSE VOM NETZ, UM
ELEKTRISCHE SCHLÄGE ZU VERMEIDEN.

ATTENTION: CET APPAREIL COMPORTE PLUS D’UN CORDON D’ALIMENTATION.
RAFIN DE PREVENIR LES CHOCS ELECTRIQUES, DEGRANCHER LES DEUX
CORDONS D’ALIMENTATION AVANT DE FAIRE LE DEPANNAGE.

B-2 Optional Installations and Mode Switch Bank Settings

Removing the Chassis Cover

To remove the chassis cover, proceed as follows:

1. Disconnect the 2H252-25R from the network as follows:

a. Unplug both power cords from the rear of the chassis.

ELECTRICAL HAZARD: TURN OFF THE 2H252-25R BY UNPLUGGING THE
POWER CORD FROM THE REAR OF THE CHASSIS.

AM HINTEN DES 2H252-25R STECHEI ABZIEHEN UM AUS ZU SCHALTEN.
APAGUE EL 2H252-25R DESENCHUFE EL CABLE DE LA UNIDAD.

TIP: Before performing step b, mark the cables connected to the 2H252-25R according
to their associated port numbers. This is recommended for ease of reinstallation.

b. Disconnect all network cables attached to the 2H252-25R.

2. If the 2H252-25R is rack mounted, remove it from the rack and remove the rackmount brackets
(refer to Chapter 3, Installation).

Optional Installations and Mode Switch Bank Settings B-3

Removing the Chassis Cover

3. Use a Phillips screwdriver to remove the four screws attaching the cover to the chassis. (See

Figure B-1.)

Figure B-1 Removing the Chassis Cover

Screws (4)

Chassis Cover

Front Panel

Chassis

Note: If the device was rack mounted, the four screws fastening the cover to
the front panel are removed and installed along with the rackmount brackets.

2504-30

4. Remove the cover by sliding it back until it clears the front of the chassis and then lifting it

straight up and off the chassis.

To reinstall the chassis cover, perform the removal procedures in reverse.

B-4 Optional Installations and Mode Switch Bank Settings

Setting the Mode Switches

B.3 SETTING THE MODE SWITCHES

Figure B-2 shows the location of the mode switches and the switch settings for normal operation.

These switches are set at the factory and rarely need to be changed.

Switch definitions and positions are as follows:

• Switches 1 through 4 – For Enterasys Networks use only.

• Switch 5 – COM Port Autobaud. The default (OFF) position enables Autobaud sensing on the

COM port for Local Management sessions. Changing the switch to the ON position disables
Autobaud sensing and sets the COM port to 9600 baud for Local Management sessions.

Figure B-2 Mode Switch Location

TOP VIEW WITHOUT COVER

Primary
Power
Supply

Redundant
Power
Supply

FRONT PANEL

MODE SWITCH BANK

ON

OFF

12345678

25041-11

Optional Installations and Mode Switch Bank Settings B-5

Setting the Mode Switches

• Switch 6 – Forced BootP.

NOTE: After changing the position of switch 6, DO NOT reapply power to the chassis
until there is a station on the network acting as a BootP server, which contains the
downloadable firmware image file.

DO NOT attempt a Forced BootP unless a BootP server has been configured for the 2H252-25R.
The BootP server references the location of a station acting as a Trivial File Transfer Protocol
(TFTP) server containing the 2H252-25R image file.

When the position of Switch 6 is changed and the power is cycled to the 2H252-25R, the device
requests the image file location from the BootP server and uses TFTP to download the image
from the TFTP server. If one of these requirements is not met, the 2H252-25R continues to
request either the BootP server or the TFTP server until the RESET button on the 2H252-25R is
pressed. Once the RESET button is pressed, the 2H252-25R resets after one minute and loads
the image stored in FLASH memory.

• Switch 7 – Clear NVRAM. Changing the position of this switch resets NVRAM on the next

power-up of the device. All user-entered parameters, such as the IP address, device names, etc.,
are reset to the factory default settings. Once the 2H252-25R resets, you can either use the
factory default settings or reenter your own parameters.

• Switch 8 – Reset Password/Community Names. Changing the position of this switch clears

user-entered passwords stored in NVRAM, and restores the factory default passwords on the
next power-up of the device. Once the 2H252-25R resets, you can either use the factory default
settings or reenter your own passwords.

NOTE: Do not change the position of switch 8 unless it is necessary to reset the module
super-user configured passwords to their factory default settings.

B-6 Optional Installations and Mode Switch Bank Settings

SIMM Upgrade

B.4 SIMM UPGRADE

Memory upgrade is available for the 2H252-25R to expand its DRAM to 32 MB. This section
explains how to locate and add/replace a Single In-line Memory Module (SIMM). For information
on the available SIMM upgrades, call Enterasys Networks for technical support. For details on
getting help, refer to Section 1.2.

B.4.1 Locating SIMMs

Figure B-3 shows the two locations of the DRAM SIMM connector.

Figure B-3 SIMM Slot Locations

TOP VIEW WITHOUT COVER

DRAM

Primary
Power
Supply

Redundant
Power
Supply

FRONT PANEL

2504-84

Optional Installations and Mode Switch Bank Settings B-7

SIMM Upgrade

B.4.2 Installing the DRAM SIMM

CAUTION: Observe all antistatic precautions when handling sensitive electronic

equipment.

To install a DRAM SIMM, refer to Figure B-4 and proceed as follows:

1. With the SIMM alignment notch oriented as shown in Figure B-4, insert the SIMM down

between the connector teeth.

2. Pivot the SIMM downward so the connector clips align with the two side notches of the SIMM

and the connector clips lock the SIMM into place.

Figure B-4 Installing the DRAM

Side Notch

Connector

Clip

2

SIMM

Connector

Teeth

1

Side Notch

Clip

Alignment Notch

2504-91

B-8 Optional Installations and Mode Switch Bank Settings

Installing Optional HSIM or VHSIM Interface Modules

B.5 INSTALLING OPTIONAL HSIM OR VHSIM INTERFACE MODULES

Figure B-5 shows the location of the two connectors for an optional High HSIM or VHSIM.
Depending on the HSIM or VHSIM installed, one or both connectors are used.

NOTE: The installation instructions for the optional HSIM or VHSIM are in the
associated user’s guide.

Figure B-5 HSIM and VHSIM Connector Locations

TOP VIEW WITHOUT COVER

Primary
Power
Supply

Redundant
Power
Supply

FRONT PANEL

Optional
HSIM or VHSIM

Connectors

2504-31

Optional Installations and Mode Switch Bank Settings B-9

Index

Numerics

100BASE-T

requirements 2-2

10BASE-T

requirements 2-1

2H252-25R

description of 1-1
front panel 1-1

802.1p Port Priority

introduction to 1-6

B

Broadcast Suppression

introduction to 1-4

C

Cable specifications

100BASE-TX network 2-2

10BASE-T network 2-1
Chassis cover, removal of B-2
COM port

pin assignments A-3
Connecting to the network 3-9
Connectivity

introduction to 1-2

D

Document conventions xiii

F

Flow control

introduction to 1-5

Full Duplex Switched Ethernet, introduction

to 1-3

G

Getting help 1-8

H

High speed interface module

installation of B-9

I

Installation

High speed interface module

location of B-9
in a rack 3-4
on a tabletop or shelf 3-3
Very High speed interface module

location of B-9

L

LANVIEW LEDs 4-1
Local Management

introduction to 1-6

E

Environmental requirements A-2

Index-1

M

S

Management

use of 1-6

Memory

upgrading B-7

Mode Switch

setting B-5

N

Network connection of

twisted pair cables 3-9

Network connections 3-9

P

Physical properties A-1
Port redirect function

introduction to 1-4

Power connection 3-8

R

Redirect functions

port and VLAN

introduction to 1-4
Regulatory Compliance A-3
Related manuals xii
Remote Monitoring (RMON)

introduction to 1-4
RESET button 4-9
Runtime IP address discovery

introduction to 1-2

SIMMs

installing DRAM B-8
location B-7

SmartTrunk

introduction to 1-3
Specifications A-1
Standards compatibility 1-7
Switching options

introduction to 1-6

T

Troubleshooting 4-1

checklist 4-6
Twisted pair cables

connection of 3-9

U

Unpacking 3-1

V

Very high speed interface module

installation of B-9
VLAN redirect function

introduction to 1-4

Index-2