Enterasys Vertical Horizon VH-2402S User manual

9033644
Vertical Horizon
VH-2402S
FAST ETHERNET SWITCH
USER GUIDE

Notice
9033644 i
NOTICE
Enterasys Networks reserves the right to make changes in specifications and other information
contained in this document 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 manual 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) ARISING OUT OF OR RELATED TO THIS MANUAL OR
THE INFORMATION CONTAINED IN IT, EVEN IF ENTERASYS NETWORKS HAS BEEN
ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH
DAMAGES.
2000 by Enterasys Networks, Inc. P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in Taiwan, R.O.C.
Order Number: 9033644 October 2000
Enterasys, Enterasys Networks, and Vertical Horizon are trademarks or registered trademarks of
Enterasys Networks, Inc.
Microsoft, Windows, Windows 95, Windows 98, and Windows NT are either trademarks or registered
trademarks of Microsoft Corporation.
Netscape and Netscape Navigator are trademarks of Netscape Communications Corporation.
All other product names mentioned in this manual may be trademarks or registered trademarks of
their respective companies.
Only qualified personnel should perform installation
procedures.

Notice
ii 9033644
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.
SAFETY INFORMATION
CLASS 1 LASER TRANSCEIVERS
The VH-2402S 24-port switch uses Class 1 Laser transceivers. Read the following safety information
before installing or operating these modules.
Class 1 laser transceivers use an optical feedback loop to maintain Class 1 operation limits. This
control loop eliminates the need for maintenance checks or adjustments. The output is factory set, and
does not allow any user adjustment. Class 1 Laser transceivers comply with the following safety
standards:

Notice
9033644 iii
• 21 CFR 1040.10 and 1040.11 U.S. Department of Health and Human Services (FDA).
• IEC Publication 825 (International Electrotechnical Commission).
• CENELEC EN 60825 (European Committee for Electrotechnical Standardization).
• When operating within their performance limitations, laser transceiver output meets the Class 1
accessible emission limit of all three standards. Class 1 levels of laser radiation are not considered
hazardous.
SAFETY INFORMATION
CLASS 1 LASER TRANSCEIVERS
LASER RADIATION AND CONNECTORS
When the connector is in place, all laser radiation remains within the fiber. The maximum amount of
radiant power exiting the fiber (under normal conditions) is -12.6 dBm or 55 x 10-6 watts.
Removing the optical connector from the transceiver allows laser radiation to emit directly from the
optical port. The maximum radiance from the optical port (under worst case conditions) is 0.8 W cm-2
or 8 x 103W m2sr-1.
Do not use optical instruments to view the laser output. The use of optical instruments to view laser
output increases eye hazard. When viewing the output optical port, power must be removed from the
switch.
WARNING: FIBER OPTIC PORT SAFETY
AVERTISSMENT: PORTS POUR FIBRES OPTIQUES -
SÉCURITÉ SUR LE PLAN OPTIQUE
WARNHINWEIS: FASEROPTIKANSCHLÜSSE -
OPTISCHE SICHERHEIT
When using a fiber optic port, never look at the transmit laser while it is
powered on. Also, never look directly at the fiber TX port and fiber cable
ends when they are powered on.
Ne regardez jamais le laser tant qu'il est sous tension. Ne regardez jamais
directement le port TX (Transmission) à fibres optiques et les embouts de
câbles à fibres optiques tant qu'ils sont sous tension.
Niemals ein Übertragungslaser betrachten, während dieses eingeschaltet ist.
Niemals direkt auf den Faser-TX-Anschluß und auf die Faserkabelenden
schauen, während diese eingeschaltet sind.

Notice
iv 9033644
SAFETY INFORMATION
WICHTIGE SICHERHEITSHINWEISE (GERMANY)
1. Bitte lesen Sie diese Hinweise sorgfältig durch.
2. Heben Sie diese Anleitung für den späteren Gebrauch auf.
3. Vor jedem Reinigen ist das Gerät vom Stromnetz zu trennen. Verwenden Sie keine Flüssigoder
Aerosolreiniger. Am besten eignet sich ein angefeuchtetes Tuch zur Reinigung.
4. Die Netzanschlu ßsteckdose soll nahe dem Gerät angebracht und leicht zugänglich sein.
5. Das Gerät ist vor Feuchtigkeit zu schützen.
6. Bei der Aufstellung des Gerätes ist auf sicheren Stand zu achten. Ein Kippen oder Fallen
könnte Beschädigungen hervorrufen.
7. Die Belüftungsöffnungen dienen der Luftzirkulation, die das Gerät vor Überhitzung schützt.
Sorgen Sie dafür, daß diese Öffnungen nicht abgedeckt werden.
8. Beachten Sie beim Anschluß an das Stromnetz die Anschlußwerte.
9. Verlegen Sie die Netzanschlußleitung so, daß niemand darüber fallen kann. Es sollte auch nichts
auf der Leitung abgestellt werden.
10. Alle Hinweise und Warnungen, die sich am Gerät befinden, sind zu beachten.
11. Wird das Gerät über einen längeren Zeitraum nicht benutzt, sollten Sie es vom Stromnetz
trennen. Somit wird im Falle einer Überspannung eine Beschädigung vermieden.
12. Durch die Lüftungsöffnungen dürfen niemals Gegenstände oder Flüssigkeiten in das Gerät
gelangen. Dies könnte einen Brand bzw. elektrischen Schlag auslösen.
13. Öffnen sie niemals das Gerät. Das Gerät darf aus Gründen der elektrischen Sicherheit nur von
authorisiertem Servicepersonal geöffnet werden.
14. Wenn folgende Situationen auftreten ist das Gerät vom Stromnetz zu trennen und von einer
qualifizierten Servicestelle zu überprüfen:
a. Netzkabel oder Netzstecker sind beschädigt.
b. Flüssigkeit ist in das Gerät eingedrungen.
c. Das Gerät war Feuchtigkeit ausgesetzt.
d. Wenn das Gerät nicht der Bedienungsanleitung entsprechend funktioniert oder Sie mit Hilfe
dieser Anleitung keine Verbesserung erzielen.
e. Das Gerät ist gefallen und/oder das Gehäuse ist beschädigt.
f. Wenn das Gerät deutliche Anzeichen eines Defektes aufweist.
15. Zum Netzanschluß dieses Gerätes ist eine geprüfte Leitung zu verwenden. Für einen Nennstrom
bis 6A und einem Gerätegewicht größer 3kg ist eine Leitung nicht leichter als H05VV-F, 3G,
0.75mm2einzusetzen.
Der arbeitsplatzbezogene Schalldruckpegel nach DIN 45 635 Teil 1000 beträgt 70dB(A) oder
weniger.

Notice
9033644 v
ENTERASYS NETWORKS, INC.
PROGRAM LICENSE AGREEMENT
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CAREFULLY READ THIS LICENSE AGREEMENT.
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BY THE TERMS OF THIS AGREEMENT, WHICH INCLUDES THE LICENSE AND THE
LIMITATION OF WARRANTY AND DISCLAIMER OF LIABILITY. IF YOU DO NOT AGREE
TO THE TERMS OF THIS AGREEMENT, RETURN THE UNOPENED PRODUCT TO
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OF RECEIPT FOR A FULL REFUND.
IF YOU HAVE ANY QUESTIONS ABOUT THIS AGREEMENT, CONTACT ENTERASYS
NETWORKS [phone]. Attn: Legal Department.
1. LICENSE. You have the right to use only the one (1) copy of the Program provided in this
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You may not copy, reproduce or transmit any part of the Program except as permitted by the
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venue of the New Hampshire courts.
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component thereof, if such foreign produced direct product is subject to national security controls as
identified on the U.S. Commerce Control List or is subject to State Department controls under the
U.S. Munitions List.

Notice
vi 9033644
5. UNITED STATES GOVERNMENT RESTRICTED RIGHTS. The enclosed Product (i) was
developed solely at private expense; (ii) contains “restricted computer software”submitted with
restricted rights in accordance with section 52.227-19 (a) through (d) of the Commercial Computer
Software-Restricted Rights Clause and its successors, and (iii) in all respects is proprietary data
belonging to Enterasys and/or its suppliers. For Department of Defense units, the Product is
considered commercial computer software in accordance with DFARS section 227.7202-3 and its
successors, and use, duplication, or disclosure by the Government is subject to restrictions set forth
herein.
6. EXCLUSION OF WARRANTY. Except as may be specifically provided by Enterasys in
writing, Enterasys makes no warranty, expressed or implied, concerning the Program (including its
documentation and media).
ENTERASYS DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO
YOU BY ENTERASYS IN WRITING, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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WRITTEN MATERIALS, AND ANY ACCOMPANYING HARDWARE.
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(INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS, PROFITS,
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INCIDENTAL DAMAGES, OR IN THE DURATION OR LIMITATION OF IMPLIED
WARRANTIES IN SOME INSTANCES, THE ABOVE LIMITATION AND EXCLUSIONS MAY
NOT APPLY TO YOU.

Notice
9033644 vii
DECLARATION OF CONFORMITY
Application of Council Directive(s): 89/336/EEC
73/23/EEC
Manufacturer’s Name: Enterasys Networks, Inc.
Manufacturer’s Address: 35 Industrial Way
PO Box 5005
Rochester, NH 03867
European Representative Name: Mr. J. Simms
European Representative Address: Enterasys Networks Limited
Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG14 2PZ, England
Conformance to Directive(s)/Product Standards: EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 50082-1
EN 60950
Equipment Type/Environment: Networking Equipment, for use in a
Commercial or Light Industrial
Environment.
We the undersigned, hereby declare, under our sole responsibility, that the equipment packaged
with this notice conforms to the above directives.
Manufacturer Legal Representative in Europe
Mr. Thomas Whissel Mr. J. Simms
___________________________________ ___________________________________
Full Name Full Name
Compliance Engineering Manager Managing Director - E.M.E.A.
___________________________________ ___________________________________
Title Title
Rochester, NH, USA Newbury, Berkshire, England
___________________________________ ___________________________________
Location Location

Notice
viii 9033644

9033644 Table of Contents ix
TABLE OF CONTENTS
PREFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XI
Purpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Message Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Keyboard Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Other Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
1. PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Optional Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Feature Summaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
IEEE 802.1D Bridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Spanning Tree Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Frame Buffering and Frame Latency . . . . . . . . . . . . . . . . . . . . . . . . 7
Software Download . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Non-Volatile Parameter Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Configuration and Management Interfaces . . . . . . . . . . . . . . . . . . . 8
RMON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Port Mirroring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Auto-negotiation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
BootP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Full Duplex Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Flow Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Virtual LANs (VLANs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Class of Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Port Trunking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Client/Server Network Application . . . . . . . . . . . . . . . . . . . . . . . . . 15
Local Backbone Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2. INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Inspecting Your Shipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Site Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Mounting the Switch or Stack on a Table or Shelf . . . . . . . . . . . . . . . . 18
Mounting the Switch in a Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Connecting Switches to the Stack’s Backplane . . . . . . . . . . . . . . . . . . 20
Stacking Module and Interconnect Cables . . . . . . . . . . . . . . . . . . 20
Installing an Optional Module into the Switch . . . . . . . . . . . . . . . . . . . . 21

x Table of Contents VH-2402S
Connecting a Terminal to the Console Port . . . . . . . . . . . . . . . . . . . . . 22
Console Port (Out-of-Band) Connections . . . . . . . . . . . . . . . . . . . 22
Remote Management via the Console Port . . . . . . . . . . . . . . . . . 23
In-Band Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Management Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Powering the Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Network Cable Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Copper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Fiber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10Base-T/100Base-TX Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
100Base-FX/1000Base-SX/LX Fiber Ports . . . . . . . . . . . . . . . . . . . . . 28
APPENDIX A. TECHNICAL SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . 29
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Standards Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Regulatory Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Data Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Port Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Console Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10Base-T and 100Base-TX Ports . . . . . . . . . . . . . . . . . . . . . . . . . 31
MDI/MDI-X Crossover Cable Wiring . . . . . . . . . . . . . . . . . . . . . . . 32
Power Cord Set Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Country-Specific Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . 33
APPENDIX B. FLOW CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
APPENDIX C. ACRONYMS & ABBREVIATIONS . . . . . . . . . . . . . . . . . . . . . . 37
INDEX

9033644 Preface xi
PREFACE
Purpose
This guide provides information about the features and applications of the
Enterasys Networks Vertical Horizon VH-2402S stackable switch system.
Audience
This guide is intended for Ethernet Local Area Network (LAN)
administrators and Management Information Systems (MIS) personnel
with the following background:
•Working knowledge of Ethernet LANs
•Familiarity with Transmission Control Protocol/Internet Protocol
(TCP/IP) and Simple Network Management Protocol (SNMP)
Conventions
This section describes the conventions used in this guide.
Message Formats
Two types of messages, identified by icons, appear in the text:
Keyboard Entries
This guide uses the following conventions for keyboard entries:
•When you read “enter,” type the text and press the [Enter] key.
•Example: Enter the Gateway IP address and press the [Enter] key.
•When you read “select,” highlight the menu item and press the [Enter]
key.
A note informs you of special circumstances.
A caution indicates the possibility of equipment damage.

xii Preface VH-2402S
Other Conventions
This guide uses the following typographical conventions:
•Initial Caps Menu titles and console menu selections.
•[Enter] Used to designate the Enter or Return key.
•courier font Screen messages and user prompts.
•Selection Describes a user-configurable user interface item.
•Field Describes a read-only information item.
Organization
Chapter 1. Product Overview: Describes the features of the switch, front
and rear panel components and application examples.
Chapter 2. Installation: Describes the content of your switch shipment,
lists site requirements, and provides mounting instructions. Instructions
for making connections and powering up the switch are provided as well.
Appendix A. Technical Specifications: Provides a list of standards
compliance and certifications as well as physical and operational
specifications.
Appendix B. Flow Control: Describes how the flow control features are
used to provide a mechanism for protecting the switch from overload
conditions and to keep additional traffic off the network.
Appendix C. Acronyms and Abbreviations: Provides definitions for a
list of common acronyms and abbreviations used within the installation
guide and the networking industry.

9033644 Product Overview 1
1. PRODUCT OVERVIEW
This chapter provides the following information:
•Product Description
•Features
•Front and Rear Panel Component Descriptions
•Feature Summaries
•Application Example
Description
This installation guide describes Enterasys Networks’ Vertical Horizon
VH-2402S Fast Ethernet switch. The switch provides 24
10Base-T/100Base-TX ports, plus two slots for optional slide-in
100Base-FX, 1000Base-SX or 1000Base-LX modules. One of these slots
can also be used for an optional Stacking Module that allows you to attach
up to seven switches to a 5 Gbps high-speed backplane. There is also an
optional SNMP-based Management Module that can be installed in the
rear panel. This module supports both in-band and out-of-band access for
managing the switch and the attached stack.
The switch employs a high-speed switching fabric. This design allows for
simultaneous transport of multiple packets at low latency on all ports. It
also uses store-and-forward switching to ensure maximum data integrity.
In this mode, the entire packet must be received into a port buffer and
checked for validity before being forwarded. This prevents errors from
being propagated throughout the network. This switch also features full-
duplex capability on all ports, which effectively doubles the bandwidth of
each connection.
The switch can be used in a standalone configuration, or can be stacked
up to seven high to form a single logical switch with up to 182 ports. When
stacked, the 5 Gbps stack backplane provides enough bandwidth for the
most demanding environment. Moreover, you can use a 100 Mbps fiber
module for connecting to a remote site, or a Gigabit module for a high-
speed backbone connection.
The RMON/SNMP/Web Management Module provides a broad range of
management options. It includes a standards-compliant Simple Network
Management Protocol (SNMP) agent. The SNMP agent allows network
management station applications to collect and present status and
performance information about the stack, as well as providing the ability
A switch stack, or a switch in a standalone configuration, must
have an optional Management Module installed to enable all
ports. The base unit alone has all ports disabled by default.

2 Product Overview VH-2402S
to configure and control functions in the stack. The module also supports
Remote Monitoring (RMON) for Statistics, History, Alarm and Event
groups (Groups 1-3, 9).
Network management can be performed in-band using TCP/IP or Telnet
connection to the serial console port on the Management Module.
This
module also includes a built-in Web agent that provides management
access via common http browsers such as Netscape Navigator and
Microsoft’s Internet Explorer. In addition, the console port allows out-of-
band management using a PC, terminal, or modem connection.
The VH-2402S switch is desktop or rack-mountable. LEDs on the front
panel provide information about the operating status of the switch. The
back panel contains the power connector, redundant power connector,
and three slots for the optional modules. The side panel includes two fans
that maintain ventilation and cooling for internal switch components.
Features
•Ports:
- 24 dual-speed 10Base-T/100Base-TX ports using RJ-45
connectors (MDI-X)
- 3 slots for optional modules
- 1 redundant power unit socket
•Optional Media Modules:
- VH1000-S1SX: 1000Base-SX Module provides 1 SC multi-
mode fiber optic port for an uplink connection to the stack
- VH1000-S1LX: 1000Base-LX Module provides 1 SC single-
mode fiber optic port for an uplink connection to the stack
- VH100-S2MFX: 100Base-FX Module provides 2 SC multi-
mode fiber optic ports for an uplink connection to the stack
- VH100-S1SFX: 100Base-FX Module provides 1 SC single-
mode fiber optic port for an uplink connection to the stack
•Optional Stacking Module:
- VH-STACK: Stacking Module provides 2 SCSI II connectors
for stacking switches (includes one 32 cm stack
interconnection cable)
•Optional Stacking Cable:
- 9380142: 32 cm stack interconnection cable
•Optional RMON/SNMP/Web Management Module:
- VH-SMGMT: Management Module provides SNMP, RMON,
and Web management support for the stack.

9033644 Product Overview 3
•Switch Architecture:
- 3 controllers with 8 10/100 ports
- IEEE 802.3u auto-negotiation of half/full-duplex operation on
all RJ-45 ports
- Up to 7 switch units can be stacked together, supporting up to
182 connections
- 128 KB packet buffering for 10/100 ports, 2 MB packet
buffering for 1000 ports
- Store-and-forward switching
-
8K address forwarding table
- Forwarding: 14,880 packets-per-second (64 byte packets)
@10 Mbps; 148,800 pps @100 Mbps; 1,488,000 pps @1000
Mbps
- Filtering: 14,880 packets-per-second (64 byte packets) @10
Mbps; 148,800 pps @100 Mbps; 1,488,000 pps @1000 Mbps
•Network Management:
- SNMP compliant agent: MIB II (RFC 1213); Bridge MIB (RFC
1493); Ethernet-like MIB (RFC 1643); RMON - Statistics,
History, Alarm and Event groups (RFC 1757); Interface
Evolution MIB (RFC 1573); Q-MIB (IEEE 802.1Q); private MIB
extensions
- Access via in-band, Internet browser, or Telnet
- Console port (RS-232, male DB-9 connector, null modem)
supports access via direct or modem connection
- BootP for IP address configuration
•Reliability:
- Redundant power supply support
•Software:
- Diagnostics for product testing and troubleshooting
- Firmware upgrades using the console port or in-band with
TFTP
•LED Indicators:
- System: Power, RPU, Management
- 10Base-T/100Base-TX ports: link/speed/disable,
mode (flow control, full duplex, activity)
- Media module ports: Status, Activity

4 Product Overview VH-2402S
Front Panel
Figure 1-1 shows the front panel of the Enterasys Networks Vertical
Horizon VH-2402S. Table 1-1 defines the VH-2402S front panel
components.
Figure 1-1. VH-2402S Front Panel
Table 1-1. Front Panel Components
Name Function
Power LED Lights steady green to indicate power is supplied to the
switch. Off indicates no power is supplied to the switch.
RDP LED Lights steady to indicate that a redundant power unit is
attached and is in backup or active mode.
Mgmt LED Lights steady to indicate that a Management Module is
installed and in operational mode.
Link LEDs Yellow indicates a 10 Mbps link; green indicates a 100
Mbps link, off indicates no link; and flashing indicates
that the port has been manually disabled.
Mode LEDs The Mode Select button selects the LED display mode.
Act: Flashing indicates activity on the port segment.
FDX: Lights steady to indicate full-duplex operation.
Flow Ctrl: Lights steady to indicate that flow control is
enabled for the port.
Module LEDs Status: Indicates a module is installed in the slot.
Activity: Flashing indicates activity on the module.
Switch ID LCD LCD displays the stack ID number of the switch.
10Base-T/100Base-TX
RJ-45 ports
Copper ports using RJ-45 port connectors. All the ports
are wired MDI-X.

9033644 Product Overview 5
Optional Modules
Figure 1-2 shows the optional modules available for the Enterasys
Networks Vertical Horizon VH-2402S. Table 1-2 defines the optional
module components.
Figure 1-2. Optional Modules
Table 1-2. Optional Module Components
Module Components
100Base-FX (MMF)
Ports: Two multi-mode fiber ports using SC connectors
for uplink. (See 100Base-FX/1000Base-SX/LX Fiber
Ports on page 28 for a detailed
description.)
100Base-FX (SMF)
Ports: One single-mode fiber port using SC connectors
for uplink. (See 100Base-FX/1000Base-SX/LX Fiber
Ports on page 28 for a detailed
description.)
1000Base-SX
Ports: One fiber port using SC connectors for uplink.
(See 100Base-FX/1000Base-SX/LX Fiber Ports on page
28 for a detailed
description of these ports.)

6 Product Overview VH-2402S
Rear Panel
Figure 1-3 shows the VH-2402S rear panel and Table 1-3 defines the rear
panel components.
Figure 1-3. VH-2402S Rear Panel
Table 1-3. Rear Panel Components
1000Base-LX Ports: One fiber port using SC connectors for uplink.
(See 100Base-FX/1000Base-SX/LX Fiber Ports on page
28 for a detailed
description of these ports.)
Stacking
Ports: Two SCSI II ports for stack uplink and downlink
connections.
One 32 cm cable included with the stacking module
and both the 32 cm cable (9380142) and the 1 m cable
(9380143) can be ordered separately, if required.
Management Console port: Male DB-9 connector configured as a
null modem connection for serial out-of-band
management using the console menus.
Name Function
Power Connector Provides AC power to the switch.
Redundant Power
Connector
This connector is provided for the option of adding an
additional DC redundant power unit (RPU) which can
supply power to the switch if its primary power supply
fails. (Refer to the manual provided with the RPU for
further details.)
Slots for Optional
Modules
The upper slot is for the Management Module only. The
two lower slots support optional media modules or the
Stacking Module.
Module Components