SMC Networks SMC8950EM, SMC8926EM User Manual

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INSTALLATION GUIDE

SMC8926EM

SMC8950EM

TigerStack II 10/100/1000 24/48-Port Stackable Layer 3 Gigabit Switch

TigerStack II 10/100/1000 Installation Guide

From SMC's Tiger line of feature-rich workgroup LAN solutions

20 Mason Irvine, CA 92618 Phone: (949) 679-8000

Pub. # 150200000054A

August 2009

E082009-MW-R01

Information furnished by SMC Networks, Inc. (SMC) is believed to be accurate and reliable. However, no responsibility is assumed by SMC for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SMC. SMC reserves the right to change specifications at any time without notice.

SMC Networks, Inc.

20 Mason

Irvine, CA 92618

Trademarks: SMC is a registered trademark; and EZ Switch, TigerStack and TigerSwitch are

trademarks of SMC Networks, Inc. Other product and company names are trademarks or registered trademarks of their respective holders.

Warranty and Product Registration

To register SMC products and to review the detailed warranty statement, please refer to the Support Section of the SMC Website at http://www.smc.com.

Compliances and Safety Warnings

FCC - Class A

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

You are cautioned that changes or modifications not expressly approved by the party responsible for compliance could void your authority to operate the equipment.

You may use unshielded twisted-pair (UTP) for RJ-45 connections - Category 3 or better for 10 Mbps connections, Category 5 or better for 100 Mbps connections, Category 5, 5e, or 6 for 1000 Mbps connections. For fiber optic connections, you may use 50/125 or 62.5/ 125 micron multimode fiber or 9/125 micron single-mode fiber.

Industry Canada - Class A

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus as set out in the interference-causing equipment standard entitled “Digital Apparatus,” ICES-003 of the Department of Communications.

Cet appareil numérique respecte les limites de bruits radioélectriques applicables aux appareils numériques de Classe A prescrites dans la norme sur le matériel brouilleur: “Appareils Numériques,” NMB-003 édictée par le ministère des Communications.

CE Mark Declaration of Conformance for EMI and Safety (EEC)

This information technology equipment complies with the requirements of the Council Directive 89/336/EEC on the Approximation of the laws of the Member States relating to Electromagnetic Compatibility and 73/23/EEC for electrical equipment used within certain voltage limits and the Amendment Directive 93/68/EEC. For the evaluation of the compliance with these Directives, the following standards were applied:

RFI Emission: • Limit class A according to EN 55022:1998

• Limit class A for harmonic current emission according to EN 61000-3-2/1995

• Limitation of voltage fluctuation and flicker in low-voltage supply system according to EN 61000-3-3/1995

Immunity: • Product family standard according to EN 55024:1998

• Electrostatic Discharge according to EN 61000-4-2:1995 (Contact Discharge: ±4 kV, Air Discharge: ±8 kV)

• Radio-frequency electromagnetic field according to EN 61000-4-3:1996 (80 - 1000 MHz with 1 kHz AM 80% Modulation: 3 V/m)

• Electrical fast tra nsient/burst according to EN 61000-4-4:1995 (AC/DC power supply: ±1 kV, Data/Signal lines: ±0.5 kV)

• Surge immunity test according to EN 61000-4- 5:1995 (AC/DC Line to Line: ±1 kV, AC/DC Line to Earth: ±2 kV)

• Immunity to conducted disturbances, Induce d by radio-frequency fields: EN 61000-4-6:1996 (0.15 - 80 MHz with 1 kHz AM 80% Modulation: 3 V/m)

• Power frequency magnetic field immunity te st according to EN 61000-4-8:1993 (1 A/m at frequency 50 Hz)

• Voltage dips, short interruptions and voltage variations immunity test according to EN 61000-4-11:1994 (>95% Reduction @10 ms, 30% Reduction @500 ms, >95% Reduction @5000 ms)

LVD: • EN 60950-1:2001

Caution: Do not plug a phone jack connector in the RJ-45 port. This may damage this

device.

Attention: Les raccordeurs ne sont pas utilisés pour le système téléphonique!

Safety Compliance

CLASS I

LASER DEVICE

DISPOSITIF LASER

DE CLASSE I

LASERGER DER KLASSE I

ÄT

Warning: Fiber Optic Port Safety

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.

Avertissment: Ports pour fibres optiques - sécurité sur le plan optique

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.

Warnhinweis: Faseroptikanschlüsse - Optische Sicherheit

Niemals ein Übertragungslase r betrachten, während dieses eingeschaltet ist. Niemals direkt auf den Faser-TX-Anschluß und auf die Faserkabelenden schauen, während diese eingeschaltet sind.

PSE Alarm

本製品に同梱いたしております電源コードセットは、本製品専用です。本電源コードセットは、本製品以外の製品並びに他の用途でご使用いただくことは出来ません。製品本体に同梱された電源コードセットを利用し、他製品の電源コードセットを使用しないで下さい。

Power Cord Safety

Please read the following safety information carefully before installing the switch:

WARNING: Installation and removal of the unit must be carried out by qualified personnel only.

• The unit must be connected to an earthed (grounded) outlet to comply with international safety standards.

• Do not connect the unit to an A.C. outlet (power supply) without an earth (ground) connection.

• The appliance coupler (the connector to the unit and not the wall plug) must have a configuration for mating with an EN 60320/IEC 320 appliance inlet.

• The socket outlet must be near to the unit and easily accessible. You can only remove power from the unit by disconnecting the power cord from the outlet.

• This unit operates under SELV (Safety Extra Low Voltage) conditions according to IEC 60950. The conditions are only maintained if the equipment to which it is connected also operates under SELV conditions.

France and Peru only

This unit cannot be powered from IT† supplies. If your supplies are of IT type, this unit must be powered by 230 V (2P+T) via an isolation transformer ratio 1:1, with the secondary connection point labelled Neutral, connected directly to earth (ground).

†

Impédance à la terre

iii

Important! Before making connections, make sure you have the correct cord set. Check it (read the label on the cable) against the following:

Power Cord Set

U.S.A. and Canada The cord set must be UL-approved and CSA certified.

The minimum specifications for the flexible cord are:

- No. 18 AWG - not longer than 2 meters, or 16 AWG.

- Type SV or SJ

- 3-conductor The cord set must have a rated current capacity of at least 10 A The attachment plug must be an earth-grounding type with NEMA

5-15P (15 A, 125 V) or NEMA 6-15P (15 A, 250 V) configuration.

Denmark The supply plug must comply with Sect ion 107-2-D1, Standard

Switzerland The supply plug must comply with SEV/ASE 10 11. U.K. The supply plug must comply with BS1363 (3-pin 13 A) and be fitted

Europe The supply plug must comply with CEE7/7 (“SCHUKO”).

DK2-1a or DK2-5a.

with a 5 A fuse which complies with BS1362. The mains cord must be <HAR> or <BA SEC> marked and be of type

HO3VVF3GO.75 (minimum).

The mains cord must be <HAR> or <BA SEC> marked and be of type HO3VVF3GO.75 (minimum).

IEC-320 receptacle.

Veuillez lire à fond l'information de la sécurité suivante avant d'installer le Switch:

AVERTISSEMENT: L’installation et la dépose de ce groupe doivent être confiés à un personnel qualifié.

• Ne branchez pas votre appareil sur une prise secteur (alimentation électrique) lorsqu'il n'y a pas de connexion de mise à la terre (mise à la masse).

• Vous devez raccorder ce groupe à une sortie mise à la terre (mise à la masse) afin de respecter les normes internationales de sécurité.

• Le coupleur d’appareil (le connecteur du groupe et non pas la prise murale) doit

respecter une configuration qui permet un branchement sur une entrée d’appareil EN 60320/IEC 320.

• La prise secteur doit se trouver à proximité de l’appareil et son accès doit être facile.

Vous ne pouvez mettre l’appareil hors circuit qu’en débranchant son cordon électrique au niveau de cette prise.

• L’appareil fonctionne à une tension extrêmement basse de sécurité qui est conforme à

la norme IEC 60950. Ces conditions ne sont maintenues que si l’équipement auquel il est raccordé fonctionne dans les mêmes conditions.

France et Pérou uniquement:

Ce groupe ne peut pas être alimenté par un dispositif à impédance à la terre. Si vos alimentations sont du type impédance à la terre, ce groupe doit être alimenté par une tension de 230 V (2 P+T) par le biais d’un transformateur d’isolement à rapport 1:1, avec un point secondaire de connexion portant l’appellation Neutre et avec raccordement direct à la terre (masse).

Cordon électrique - Il doit être agréé dans le pays d’utilisation

Etats-Unis et Canada:

Danemark: La prise mâle d’alimentation doit respecter la section 107-2 D1 de la

Suisse: La prise mâ le d’ al imenta tion doit resp ecte r la n orme SEV/A SE 1011 . Europe La prise secteur doit être conforme aux normes CEE 7/7 (“SCHUKO”)

Le cordon doit avoir reçu l’homologation des UL et un certificat de la CSA.

Les spe'cifications minimales pour u n cable flexible sont AWG No. 18, ouAWG No. 16 pour un cable de longueur infe'rieure a` 2 me'tres.

- type SV ou SJ

- 3 conducteurs Le cordon doit être en mesure d’acheminer un courant nominal d’au

moins 10 A. La prise femelle de branchement do it être du type à mise à la terre

(mise à la masse) et respecter la conf iguration NEMA 5-15P (15 A, 125 V) ou NEMA 6-15P (15 A, 250 V).

norme DK2 1a ou DK2 5a.

LE cordon secteur doit porter la mention <HAR> ou <BASEC> et doit être de type HO3VVF3GO.75 (minimum).

Bitte unbedingt vor dem Einbauen des Switches die folgenden Sicherheitsanweisungen durchlesen:

WARNUNG: Die Installation und der Ausbau des Geräts darf nur durch Fachpersonal erfolgen.

• Das Gerät sollte nicht an eine ungeerdete Wechselstromsteckdose angeschlossen werden.

• Das Gerät muß an eine geerdete Steckdose angeschlossen werden, welche die internationalen Sicherheitsnormen erfüllt.

• Der Gerätestecker (der Anschluß an das Gerät, nicht der Wandsteckdosenstecker) muß einen gemäß EN 60320/IEC 320 konfigurierten Geräteeingang haben.

• Die Netzsteckdose muß in der Nähe des Geräts und leicht zugänglich sein. Die Stromversorgung des Geräts kann nur durch Herausziehen des Gerätenetzkabels aus der Netzsteckdose unterbrochen werden.

• Der Betrieb dieses Geräts erfolgt unter den SELV-Bedingungen (Sicherheitskleinstspannung) gemäß IEC 60950. Diese Bedingungen sind nur gegeben, wenn auch die an das Gerät angeschlossenen Geräte unter SELV-Bedingungen betrieben werden.

Stromkabel

Schweiz Dieser Stromstecker muß die SEV/ASE 1011Bestimmungen ein-

Europe Das Netzkabel muß vom Typ HO3VVF3GO.75 (Mindestanforderung)

. Dies muss von dem Land, in dem es benutzt wird geprüft werden:

halten.

sein und die Aufschrift <HAR> oder <BASEC> trag en. Der Netzstecker muß die Norm CEE 7/7 erfüllen (”SCHUKO”).

Warnings and Cautionary Messages

Warning: This product does not contain any serviceable user parts. Warning: Installation and removal of the unit must be carried out by qualified

personnel only.

Warning: When connecting this device to a power outlet, connect the field ground lead

Warning: This switch uses lasers to transmit signals over fiber optic cable. The lasers

Caution: Wear an anti-static wrist strap or take other suitable measures to prevent

Caution: Do not plug a phone jack connector in the RJ-45 port. This may damage this

Caution: Use only twisted-pair cables with RJ-45 connectors that conform to FCC

on the tri-pole power plug to a valid earth ground line to prevent electrical hazards.

are compliant with the requirements of a Class 1 Laser Product and are inherently eye safe in normal operation. However, you should never look directly at a transmit port when it is powered on.

electrostatic discharge when handling this equipment.

device. Les raccordeurs ne sont pas utilisé pour le système téléphonique!

standards.

Environmental Statement

The manufacturer of this product endeavours to sustain an environmentally-friendly policy throughout the entire production process. This is achieved though the following means:

• Adherence to national legislation and regulations on environmental production standards.

• Conservation of operational resources.

• Waste reduction and safe disposal of all harmful un-recyclable by-products.

• Recycling of all reusable waste content.

• Design of products to maximize recyclables at the end of the product’s life span.

• Continual monitoring of safety standards.

End of Product Life Span

This product is manufactured in such a way as to allow for the recovery and disposal of all included electrical components once the product has reached the end of its life.

Manufacturing Materials

There are no hazardous nor ozone-depleting materials in this product.

Documentation

All printed documentation for this product uses biodegradable paper that originates from sustained and managed forests. The inks used in the printing process are non-toxic.

vii

About This Guide

Purpose

This guide details the hardware features of this device, including the physical and performance-related characteristics, and how to install it.

Audience

The guide is intended for use by network administrators who are responsible for installing and setting up network equipment; consequently, it assumes a basic working knowledge of LANs (Local Area Networks).

Conventions

The following conventions are used throughout this guide to show information: Note: Emphasizes important information or calls your attention to related features or

instructions.

Caution: Alerts you to a potential hazard that could cause loss of data, or damage the

system or equipment.

Warning: Alerts you to a potential hazard that could cause personal injury.

Related Publication

The following publication gives specific information on how to operate and use the management functions of the switch:

The Management Guide

Also, as part of the switch’s software, there is an online web-based help that describes all management related features.s

Revision History

This section summarizes the changes in each revision of this guide.

August 2009 Revision

This is the first revision of this guide.

viii

Contents

Chapter 1: Introduction 1-1

Overview 1-1

Switch Architecture 1-2 Network Management Options 1-2

Description of Hardware 1-3

10/100/1000BASE-T Ports 1-3 SFP Slots 1-3 10 Gigabit Ethernet Module Slots 1-3 Stacking Ports 1-3 Port and System Status LEDs 1-3 Optional Redundant Power Supply 1-5 Power Supply Sockets 1-5 Optional Media Extender Modules 1-6 Extender Module LEDs 1-6

Features and Benefits 1-7

Connectivity 1-7 Expandability 1-7 Performance 1-7 Management 1-7

Chapter 2: Network Planning 2-1

Introduction to Switching 2-1 Application Examples 2-2

Collapsed Backbone 2-2 Network Aggregation Plan 2-3 Remote Connections with Fiber Cable 2-4 Making VLAN Connections 2-5 Using Layer 3 Routing 2-6

Application Notes 2-7

Chapter 3: Installing the Switch 3-1

Selecting a Site 3-1 Ethernet Cabling 3-1 Equipment Checklist 3-2

Package Contents 3-2 Optional Rack-Mounting Equipment 3-2

Mounting 3-3

Rack Mounting 3-3

Contents

Desktop or Shelf Mounting 3-4 Installing an Optional Module into the Switch 3-5 Installing an Optional SFP Transceiver 3-6 Connecting Switches in a Stack 3-7

Stacking Topologies 3-8 Connecting to a Power Source 3-8 Connecting to the Console Port 3-9

Wiring Map for Serial Cable 3-9

Chapter 4: Making Network Connections 4-1

Connecting Network Devices 4-1 Twisted-Pair Devices 4-1

Cabling Guidelines 4-1

Connecting to PCs, Servers, Hubs and Switches 4-2

Network Wiring Connections 4-2 Fiber Optic SFP Devices 4-3 10 Gbps Fiber Optic Connections 4-4 Connectivity Rules 4-6

1000BASE-T Cable Requirements 4-6

10 Gbps Ethernet Collision Domain 4-6

1000 Mbps Gigabit Ethernet Collision Domain 4-7

100 Mbps Fast Ethernet Collision Domain 4-7

10 Mbps Ethernet Collision Domain 4-7 Cable Labeling and Connection Records 4-8

Appendix A: Troubleshooting A-1

Diagnosing Switch Indicators A-1

Diagnosing Power Problems with the LEDs A-1 Power and Cooling Problems A-2 Installation A-2 In-Band Access A-2 Stack Troubleshooting A-3

Appendix B: Cables B-1

Twisted-Pair Cable and Pin Assignments B-1

10BASE-T/100BASE-TX Pin Assignments B-1

Straight-Through Wiring B-2

Crossover Wiring B-2

1000BASE-T Pin Assignments B-3

Cable Testing for Existing Category 5 Cable B-4

Adjusting Existing Category 5 Cabling to Run 1000BASE-T B-4 Fiber Standards B-4

Contents

Appendix C: Specifications C-1

Physical Characteristics C-1

Switch Features C-3

Management Features C-3

Standards C-3

Compliances C-4

Extender Modules C-4

10GBASE Extender Module (XFP) C-4

Glossary

Index

Tables

Table 1-1 Port Status LEDs 1-4 Table 1-2 System Status LEDs 1-4 Table 1-3 Supported XFP Transceivers 1-6 Table 1-4 Module LEDs 1-6 Table 3-1 Serial Cable Wiring 3-9 Table 4-1 Maximum 10GBASE-SR 10 Gigabit Ethernet Cable Length 4-6 Table 4-2 Maximum 10GBASE-LR 10 Gigabit Ethernet Cable Length 4-6 Table 4-3 Maximum 10GBASE-ER 10 Gigabit Ethernet Cable Length 4-6 Table 4-4 Maximum 1000BASE-T Gigabit Ethernet Cable Length 4-7 Table 4-5 Maximum 1000BASE-SX Gigabit Ethernet Cable Length 4-7 Table 4-6 Maximum 1000BASE-LX Gigabit Ethernet Cable Length 4-7 Table 4-7 Maximum 1000BASE-LH Gigabit Ethernet Cable Length 4-7 Table 4-8 Maximum Fast Ethernet Cable Length 4-7 Table 4-9 Maximum Ethernet Cable Length 4-7 Table A-1 Troubleshooting Chart A-1 Table A-2 Power/RPS LEDs A-1 Table B-1 10/100BASE-TX MDI and MDI-X Port Pinouts B-2 Table B-2 1000BASE-T MDI and MDI-X Port Pinouts B-3 Table B-3 Fiber Standards B-4

xii

Figures

Figure 1-1 Front Panels 1-1 Figure 1-2 Rear Panel 1-2 Figure 1-3 Port LEDs 1-4 Figure 1-4 System LEDs 1-4 Figure 1-5 Power Supply Sockets 1-5 Figure 1-6 Single-Port 10GBASE Module (XFP) 1-6 Figure 2-1 Collapsed Backbone 2-2 Figure 2-2 Network Aggregation Plan 2-3 Figure 2-3 Remote Connections with Fiber Cable 2-4 Figure 2-4 Making VLAN Connections 2-5 Figure 2-5 IP Routing for Unicast Traffic 2-6 Figure 3-1 RJ-45 Connections 3-2 Figure 3-2 Attaching the Brackets 3-3 Figure 3-3 Installing the Switch in a Rack 3-4 Figure 3-4 Attaching the Adhesive Feet 3-4 Figure 3-5 Installing an Optional Module 3-5 Figure 3-6 Inserting an SFP Transceiver into a Slot 3-6 Figure 3-7 Making Stacking Connections 3-7 Figure 3-8 Power Socket 3-8 Figure 3-9 Serial Port (RJ-45) Pin-Out 3-9 Figure 4-1 Making Twisted-Pair Connections 4-2 Figure 4-2 Network Wiring Connections 4-3 Figure 4-3 Making Connections to SFP Transceivers 4-4 Figure 4-4 Connecting to an XFP Transceiver 4-5 Figure B-1 RJ-45 Connector Pin Numbers B-1 Figure B-2 Straight-through Wiring B-2 Figure B-3 Crossover Wiring B-3

xiii

Figures

xiv

Chapter 1: Introduction

Overview

The SMC8926EM and SMC8950EM are intelligent multilayer switches (Layer 2, 3) with 24/48 10/100/1000BASE-T ports, four of which are combination ports

that are shared with four SFP transceiver slots (see Figure 1-1, Port s 21-24/45-48). The rear panel provides two slots for single-port 10 Gigabit Ethernet hot-swappable expansion modules, and two stacking ports. Units can be stacked up to eight high through the built-in stacking ports that provide a 50 Gbps stack backplane.

The switches include an SNMP-based management agent embedded on the main board, which supports both in-band and out-of-band access for managing the stack.

These switches can easily tame your network with full support for Spanning Tree Protocol, Multicast Switching, Virtual LANs, and IP routing. It brings order to poorly performing networks by segregating them into separate broadcast domains with IEEE 802.1Q compliant VLANs, empowers multimedia applications with multicast switching and CoS services, and eliminates conventional router bottlenecks.

These switches can be used to augment or completely replace slow legacy routers, off-loading local IP traffic to release valuable resources for non-IP routing or WAN access. With wire-speed performance for Layer 2 and Layer 3, these switches can significantly improve the throughput between IP segments or VLANs.

SMC8950EM

SMC8926EM

8910

Port Status LEDs

10/100/1000 Mbps RJ-45 Ports

18 19 20

21 222324

21 22 23 24

System Status LEDs

Stack

Master

Power

Master

Stack

Master

Stack ID

RPU

Link

Select

Diag

Module

Stack ID

Console

Serial Console Port

SFP Slots

ES4626H

Figure 1-1 Front Panels

* If an SFP transceiver is plugged in, the corresponding RJ-45 port is disabled for ports 21-24

on SMC8926EM or ports 45-48 on SMC8950EM.

1-1

Introduction

Stacking Ports

Power Socket

Redundant PowerSocket

ModuleSlots

Figure 1-2 Rear Panel

Switch Architecture

These Gigabit Ethernet switches employ a wire-speed, non-blocking swit ching fabric. This permits simultaneous wire-speed transport of multiple packets at low latency on all ports. The switches also feature full-duplex capability on all ports, which effectively doubles the bandwidth of each connection.

For communications between different VLANs, these switches use IP routing. For communications within the same VLAN, they use store-and-forward switching to ensure maximum data integrity. With store-and-forward switching, the entire packet must be received into a buffer and checked for validity befo re bein g forwarded . Th is prevents errors from being propagated throughout the network.

These switches include built-in stacking ports that enable up to eight units to be connected together through a 48 Gbps stack backplane. The switch stack can be managed from a master unit using a single IP address.

These switches also include two slots on the rear panel for slide-in single-port 10GBASE modules with XFP transceivers.

Network Management Options

These switches contain a comprehensive array of L EDs for “at-a-gl ance” moni toring of network and port status. They also include a management agen t that allows you to configure or monitor the switch using its embedded management software, or via SNMP applications. To manage each switch, you can make a direct connection to the console port (out-of-band), or you can manage the switches through a network connection (in-band) using Telnet, the on-boa rd web agent, or SNMP-based net work management software.

For a detailed description of both switches’ advanced features, refer to the Gigabit Ethernet Switch Management Guide.

1-2

Chapter 1: Introduction

Serial Console Port

10/100/1000 Mbps RJ-45 Ports

SFP Slots

Port Status LEDs

System Status LEDs

Stack ID

SMC8950EM

SMC8926EM

8910

18 19 20

21 222324

21 22 23 24

Stack Master

Power

Module

Diag

Stack Link

Stack ID

RPU

ES4626H

Master Select

Console

Stack ID

Stack Master

21 22 23 24

Overview

The SMC8926EM and SMC8950EM are intelligent multilayer switches (Layer 2, 3) with 24/48 10/100/1000BASE-T ports, four of which are combination ports

The switches include an SNMP-based management agent embedded on the main board, which supports both in-band and out-of-band access for managing the stack.

Figure 1-1 Front Panels

* If an SFP transceiver is plugged in, the corresponding RJ-45 port is disabled for ports 21-24

on SMC8926EM or ports 45-48 on SMC8950EM.

1-1

Introduction

Port Status LEDs

8910

Stack

Master

Power

Module

Diag

Stack

Link

Stack ID

RPU

Master Select

Console

Stack ID

Stack

Master

System Status LEDs

LED Condition Status

Link/ Activity/

Speed

On/Flashing Amber Port has a valid link at 10 or 100 Mbps. Flashing indicates activity . On/Flashing Green Port has a valid link at 1000 Mbps. Flashing indicates activity. Off The link is down.

Figure 1-3 Port LEDs

Table 1-1 Port Status LEDs

Figure 1-4 System LEDs

Table 1-2 System Status LEDs

LED Condition Status

Power Green Internal power is operating normally.

Amber Internal power supply failure. Off Power off or failure.

Diag Flashing Green System self-diagnostic test in progress.

RPS Green Redundant power supply is receiving power.

Green System self-diagnostic test successfully completed. Amber System self-diagnostic test has detected a fault.

Amber Fault in redundant power supply , including thermal or fan failure.

1-4

Off Redundant power supply is off or not plugged in.

Description of Hardware

Power Socket

Redundant Power Socket

Table 1-2 System Status LEDs (Continued)

LED Condition Status

Stack Master Green Switch is the Master unit of the stack. State may include t opo logy

Flashing Green Switch is the Master unit of the stack, system is initializing. Amber Switch is operating as a Slave unit in the stack. Flashing Amber System in Master arbitration/election state. Off System in standalone mode.

Stack Link Green Uplink and downlink operating normally.

Flashing Green Uplink has failed. Flashing Amber Downlink has failed. Off No stacking link present.

Module Green An expansion module is installed and operating normally.

Amber An expansion module is installed but has failed. Off There is no module installed.

Stack ID 1-8 Indicates the switch stack ID.

Off In standalone mode.

discovery, IP assignmen t, or normal operations.

The Master unit is numbered 1. (Note that If the master unit fails and a backup unit takes over, the stack IDs do not change.)

Slave units are numbered 2-8.

Optional Redundant Power Supply

The switch supports an optional Redundant Power Supply (RPS), that can supply power to the switch in the event the internal power supply fails.

Power Supply Sockets

There are two power sockets on the rear panel of each switch. The standard power socket is for the AC power cord. The socket labeled “RPS” is for the optional Redundant Power Supply (RPS).

Figure 1-5 Power Supply Sockets

1-5

Introduction

Optional Media Extender Modules

10GBASE XFP Module

Figure 1-6 Single-Port 10GBASE Module (XFP)

The module’s XFP slot supports standard 10 Gigabit Ethernet (10G) XFP transceivers. The 10GBASE support for flow control.

transceivers operate at 10 Gbps full duplex with

Extender Module LEDs

The optional 10GBASE slide-in module includes its own integrated LED indicators on the module’s front panel. The following table describes the LEDs.

Table 1-3 Module LEDs

LED Condition Status

Link/Activity

On/Flashing Green Port has a valid link at 10 Gbps. Flashing indicates activity. Off The link is down.

Features and Benefits

Connectivity

• 24 or 48 10/100/1000 Mbps ports for easy Gigabit Ethernet integration and for protection of your investment in legacy LAN equipment.

• Auto-negotiation enables each RJ-45 port to automatically select the optimum communication mode (half or full duplex) if this feature is su pported by the attached device; otherwise the port can be configured manually.

• RJ-45 10/100/1000BASE-T ports support auto MDI/MDI-X pinout selection.

• Unshielded (UTP) cable supported on all RJ-45 ports: Category 3 or better for 10 Mbps connections, Category 5 or better for 100 Mbps connections, and Category Category 5, 5e, 6 or better for 1000 Mbps connections.

• IEEE 802.3-2005 Ethernet, Fast Ethernet, Gigabit Ethernet, and IEEE 802.3ae 10 Gigabit Ethernet compliance ensures compatibility with standards-based hubs, network cards and switches from any vendor.

• Provides stacking capability via high-speed serial ports with 48 Gbps stacking bandwidth. Up to 8 units can be stacked together.

1-6

Features and Benefits

Expandability

• Supports 1000BASE-SX, 1000BASE-LX, and 1000BASE-LH SFP transceivers.

• Optional 10GBASE single-port expansion module with an XFP transceiver slot.

Performance

• Transparent bridging.

• Aggregate duplex bandwidth of up to 88 Gbps for the SMC8926EM or 136 Gbps for the SMC8950EM.

• Switching table with a total of 16K MAC address entries and 2K IPv4 address entries or 1K IPv6 address entries

• Provides store-and-forward switching for intra-VLAN traffic, and IP routing for inter-VLAN traffic.

• Supports wire-speed switching at layer 2, and wire-speed routing at layer 3.

• Broadcast storm control.

Management

• “At-a-glance” LEDs for easy troubleshooting

• Network management agent:

- Manages switch (or entire stack) in-band or out-of-band

- Supports console, Telnet, SSH, SNMP v1/v2c/v3, RMON (4 groups) and

web-based interface

• Slave units provide backup stack management.

1-7

Introduction

1-8

Chapter 2: Network Planning

Introduction to Switching

A network switch allows simultaneous transmission of multiple packets via non-crossbar switching. This means that it can partition a network more efficiently than bridges or routers. These switches have, therefore, been recognized as one of the most important building blocks for to day’s networking technology.

When performance bottlenecks are caused by congestion at the network access point (such as the network card for a high-volume file server), the device experiencing congestion (server, power user or hub) can be attached directly to a switched port. And, by using full-duplex mode, the bandwidth of the dedicated segment can be doubled to maximize throughput.

When networks are based on repeater (hub) technology, the distance between end stations is limited by a maximum hop count. However, a switch turns the hop count back to zero. So subdividing the network into smaller and more manageable segments, and linking them to the larger network by means of a switch, removes thi s limitation.

A switch can be easily configured in any Ethernet, Fast Ethernet, Gigabit Ethernet, or 10G Ethernet network to significantly boost bandwidth while using conventional cabling and network cards.

2-1

Network Planning

Servers

1 Gbps

Full Duplex

Workstations

100 Mbps Full Duplex

Workstations

10 Mbps Full Duplex

...

Application Examples

The Gigabit Ethernet Switches are not only designed to segment your network, but also to provide a wide range of options in setting up net work connections and li nking VLANs or IP subnets. Some typical applications are described below.

Collapsed Backbone

The Gigabit Ethernet Switches are an excellent choice for mixed Ethernet, Fast Ethernet, and Gigabit Ethernet installations where significant growth is expected in the near future. In a basic stand-alone configuration, it can provide direct fu ll -dupl ex connections for up to 24/48 workstations or servers. You can easily build on this basic configuration, adding direct full-duplex connecti ons to workst ations or serve rs. When the time comes for further expansion, just connect to anot her hub or switch using one of the Gigabit Ethernet ports built into the front panel, a Gigabit Ethernet port on a plug-in SFP transceiver, or a 10G transceiver on an optional module.

In the figure below, the 48-port Gigabit Ethernet Switch is operating as a collapsed backbone for a small LAN. It is providing dedicated 10 Mbps full-duplex con nections to workstations and 100 Mbps full-duplex connections to power users, and 1 Gbps full-duplex connections to servers.

2-2

Figure 2-1 Collapsed Backbone

Application Examples

Servers

1 Gbps

Full Duplex

Workstations

100 Mbps Full Duplex

Workstations

10 Mbps Full Duplex

...

Network Aggregation Plan

With 24 or 48 parallel bridging ports (i.e., 24 or 48 distinct collision domains), a Gigabit switch stack can collapse a complex network down into a single efficient bridged node, increasing overall bandwidth and throughput.

In the figure below, the 10/100/1000BASE-T ports in a stack of 48-port Gigabit Ethernet switches are providing 1000 Mbps connectivity throug h stackable switches. In addition, the switches are also connecting several servers at 10 Gbps.

Figure 2-2 Network Aggregation Plan

2-3

Network Planning

...

1000BASE-LX SMF (5 kilometers)

Remote Switch

1000BASE-SX MMF (500 meters)

Remote Switch

Server Farm

...

Warehouse

Research & Development

1000BASE-LX SMF (5 kilometers)

10/100/1000 Mbps Segments

Headquarters

Remote Connections with Fiber Cable

Fiber optic technology allows for longer cabling than any other media type. A 1000BASE-SX (MMF) link can connect to a site up to 550 meters away, a 1000BASE-LX (SMF) link up to 5 km, and a 1000BASE-LH link up to 70 km. This allows a switch stack to serve as a col lapsed back bone, provid ing direct connect ivity for a widespread LAN.

A 1000BASE-SX SFP transceiver can be used for a high-speed connection between floors in the same building and a 10GBASE-LR module can be used for high-bandwidth core connections between buildings in a campus setting. For long-haul connections, a 1000BASE-LH SFP tra nsceiver can be used to reach another site up to 70 kilometers away.

The figure below illustrates three Gigabit Ethernet switch stacks interconnecting multiple segments with fiber cable.

2-4

Figure 2-3 Remote Connections with Fiber Cable

Application Examples

Finance

Marketing

VLAN 3

Untagged Ports

VLAN

unaware

switch

Tagged Port

VLAN aware switch

Tagged

Ports

Finance

VLAN 3

R&D

VLAN 2

Testing

R&D

Testing

VLAN 1

VLAN 2

VLAN 4

VLAN 1

Making VLAN Connections

These switches support VLANs which can be used to organize any group of network nodes into separate broadcast domains. VLANs confine broadcast traffic to the originating group, and can eliminate broadcast storms in large networks. This provides a more secure and cleaner network environment.

VLANs can be based on untagged port groups, or traffic can be explicitly tagged to identify the VLAN group to which it belongs. Untagged VLANs ca n be used for small networks attached to a single switch. However, tagged VLANs should be used for larger networks, and all the VLANs assigned to the inter-switch links.

These switches also support multiple spanning trees which allow VLAN groups to maintain a more stable pat h between all VLAN members. This can reduce the overall amount of protocol traffic crossing the network, and provide a shorter reconfiguration time if any link in the spanning tree fails.

At Layer 3, VLANs are used to create an IP interface, where one or more ports are assigned to the same IP segment. Traffic is automatically routed between different IP segments on the same switch, without any need to configure routing protocols.

Figure 2-4 Making VLAN Connections

Note: When connecting to a switch that does not support IEEE 802.1Q VLAN tags, use

untagged ports.

2-5

Network Planning

IP Network 1

R&D

VLAN 1

VLAN 2

Testing

IP Network 2

Using Layer 3 Routing

VLANs can significantly enhance network performance and security. However, if you use conventional routers to interconnect VLANs, you can lose most of your performance advantage. These Gigabit Ethernet Switches are routing switches that provide wire-speed routing, which allows you to eliminate your conventional IP routers, except for a router to handle non-IP protocols and a gateway rout er linked to the WAN. Just assign an IP address to any VLANs that need to communicate. The switches will continue to segregate Layer 2 traf fic based on VLANs, but will now provide inter-VLAN connections for IP applications. The switches will perform IP routing for specified VLAN groups, a directly connected subnetwork, a remote IP subnetwork or host address, a subnetwork broadcast address, or an IP multicast address.

2-6

Figure 2-5 IP Routing for Unicast Traffic

Application Notes

1. Full-duplex operation only applies to point-to-point access (such as when a switch is attached to a workstation, server or another switch). When the switch is connected to a hub, both devices must operate in hal f-duplex mode.

2. For network applications that require routing between dissimilar network types, you can attach these switches directly to a multi- protocol router . Ho wever , if you have to interconnect distinct VLANs or IP subnets, you can take advantage of the wire-speed Layer 3 routing provided by these switches.

3. As a general rule, the length of fiber optic cable for a single switched link should not exceed:

• 1000BASE-SX: 550 m (1805 ft) for multimode fiber

• 1000BASE-LX: 5 km (3.1 miles) for single-mode fiber

• 1000BASE-LH: 70 km (43.5 miles) for single-mode fiber

• 10GBASE-SR: 300 m (984 ft) for multimode fiber

• 10GBASE-LR: 10 km (6.2 miles) for single-mode fiber

• 10GBASE-ER: 40 km (24.8 miles) for single-mode fiber However, power budget constraints must also be considered when calculating

the maximum cable length for your specific environment.

2-7

Network Planning

2-8

Chapter 3: Installing the Switch

Selecting a Site

Switches can be mounted in a standard 19-inch equip ment rack or on a fl at surface . Be sure to follow the guidelines below when choosing a location.

• The site should:

- be at the center of all the devices you want to link and near a power outlet.

- be able to maintain its temperature within 0 to 50 °C (32 to 122 °F) and its humidity within 5% to 95%, non-condensing

- provide adequate space (approximately five centimeters or two inches) on all sides for proper air flow

- be accessible for installing, cabling and maintaining the devices

- allow the status LEDs to be clearly visible

• Make sure twisted-pair cable is always routed away from power lines, fluorescent lighting fixtures and other sources of electrical interference, such as radios and transmitters.

• Make sure that the unit is connected to a separate grounded power outlet that provides 100 to 240 VAC, 50 to 60 Hz, is within 2 m (6.6 f eet) of each device an d is powered from an independent circuit breaker. As with any equipment, using a filter or surge suppressor is recommended.

Ethernet Cabling

To ensure proper operation when installing the switches into a network, make sure that the current cables are suitable for 10BASE-T, 100BASE-TX or 1000BASE-T operation. Check the following criteria against the current installation of your network:

• Cable type: Unshielded twisted pair (UTP) or shielded twisted pair (STP) cables with RJ-45 connectors; Category 3 or better for 10BASE-T, Category 5 or better for 100BASE-TX, and Category 5, 5e or 6 for 1000BASE-T.

• Protection from radio frequency interference emissions

• Electrical surge suppression

• Separation of electrical wires (switch related or other) and electromagnetic fields from data based network wiring

• Safe connections with no damaged cables, connectors or shields

3-1

Installing the Switch

RJ-45 Connector

Figure 3-1 RJ-45 Connections

Equipment Checklist

After unpacking the switch, check the contents to be sure you have received all the components. Then, before beginning the installation, be sure you have all other necessary installation equipment.

Package Contents

• 24- or 48-port Gigabit Ethernet Switch (SMC8926EM or SMC8950EM)

• Four adhesive foot pads

• Bracket Mounting Kit containing two brackets and eight screws for attaching the brackets to the switch

• Power cord—either US, Continental Europe or UK

• Console cable (RJ-45 to RS-232)

• This Installation Guide

• Management Guide CD

Optional Rack-Mounting Equipment

If you plan to rack-mount the switches, be sure to have the following equipment available:

• Four mounting screws for each device you pl an to instal l i n a rac k—these are no t included

• A screwdriver (Phillips or flathead, depending on the type of screws used)

3-2

Mounting

A switch unit can be mounted in a standard 19-inc h equ ipme nt ra ck or on a des kto p or shelf. Mounting instructions for each type of site follow.

Rack Mounting

Before rack mounting the switch, pay particular attention to the following factors:

• Temperature: Since the temperature within a rack assembly may be higher than the ambient room temperature, check that the rack-environment temperature is within the specified operating temperature range. (See page C-2.)

• Mechanical Loading: Do not place any equipment on top of a rack-mounted unit.

• Circuit Overloading: Be sure that the supply circuit to the rack assembly is not overloaded.

• Grounding: Rack-mounted equipment should be properly grounded. Particular attention should be given to supply connections other than direct connections to the mains.

To rack-mount devices:

1. Attach the brackets to the device using the screws provided in the Bracket

Mounting Kit.

Figure 3-2 Attaching the Brackets

3-3

Installing the Switch

2. Mount the device in the rack, using four rack-mounting screws (not provided).

Figure 3-3 Installing the Switch in a Rack

3. If installing a single switch only, turn to "Connecting to a Power Source" at the end of this chapter.

4. If installing multiple switches, mount them in the rack, one below the other, in any order.

5. If also installing an RPS, mount it in the rack below the other devices.

Desktop or Shelf Mounting

1. Attach the four adhesive feet to the bottom of the first switch.

Figure 3-4 Attaching the Adhesive Feet

2. Set the device on a flat surface near an AC power source, making sure there are at least two inches of space on all sides for proper air flow.

3-4

Installing an Optional Module into the Switch

3. If installing a single switch only, go to "Connecting to a Power Source" at the end of this chapter.

4. If installing multiple switches, atta ch four adhesive feet to ea ch one. Place each device squarely on top of the one below, in any order.

5. If also installing an RPS, place it close to the stack.

Installing an Optional Module into the Switch

Figure 3-5 Installing an Optional Module

Note: The slide-in modules are hot-swappable, you do not need to power off the switch

before installing or removing a module.

To install an optional module into the switch, do the following:

1. Remove the blank metal plate (or a previously installed module) from the appropriate slot by removing the two screws with a flat-head screwdriver.

2. Before opening the package that contains the module, touch the bag to the switch casing to discharge any potential static electricity. Also, it is recommended to use an ESD wrist strap during installation.

3. Remove the module from the anti-static shielded bag.

4. Holding the module level, guide it into the carrier rails on each side and gently push it all the way into the slot, ensuring that it firmly engages with the connector.

5. If you are sure the module is properly mated with the connector, tighten the retainer screws to secure the module in the slot.

6. The Module LED on the switch’s front panel should turn green to co nfirm that the module is correctly installed and ready to use.

3-5

Installing the Switch

Installing an Optional SFP Transceiver

Figure 3-6 Inserting an SFP Transceiver into a Slot

These switches support 1000BASE-SX and 1000BASE-LX, and 1000BASE-LH SFP-compatible transceivers. To install an SFP transceiver, do the following:

1. Consider network and cabling requirements to select an appropriate SFP transceiver type.

2. Insert the transceiver with the optical connector facing outward and the slot connector facing down. Note that SFP transceivers are keyed so they can only be installed in one orientation.

3. Slide the SFP transceiver into the slot until it clicks into place.

Note: SFP transceivers are hot-swappable. The switch does not need to be powered off

before installing or removing a transceiver. However, always first disconnect the network cable before removing a transceiver.

Note: SFP transceivers are not provided in the switch package.

3-6

Connecting Switches in a Stack

Figure 3-7 shows how the stack cables are connected between switches in a stack. Each stacking connection is a 48 Gbps full-duplex high-speed serial link using proprietary stacking cables. The switch supports a line- and ring-topology stacking configuration, or can be used stand alone. To ensure minimal disruption in case a unit or stacking cable fails, we recommend always use a ring-topology.

In line-topology stacking there is a single stack cable connection between each switch that carries two-way communications across the stack. In ring-topology stacking, an extra cable is connected between the t op and bottom switches forming a “ring” or “closed-loop.” The closed-loop cable provides a redundant path for the stack link, so if one link fails, sta ck communications can still be maintained. Figure 3-7 illustrates a ring-topology stacking configuration.

To connect up to eight switches in a stack, perform the following steps:

1. Plug one end of the stack cable (ordered separately) in the Down (right) port of the top unit.

2. Plug the other end of the stack cable into the Up (left) port of the next unit.

3. Repeat steps 1 and 2 for each unit in the stack. Form a simple chain starting at the Down port on the top unit and ending at the Up port on the bottom unit (stacking up to 8 units).

4. (Optional) To form a wrap-around topology, plug one end of a stack cable into the Down port on the bottom unit and the other end into the Up port on the top unit.

Figure 3-7 Making Stacking Connections

3-7

Installing the Switch

5. Select the Master unit in the stack by pressing the Master bu tton i n on only on e of the switches. Only one switch in the stack can operate as t he Master, all other units operate in slave mode. If more than one switch in the stack is selected as Master , or if no switches are selected, the system will select the unit with the lowest MAC address as the Master.

Stacking Topologies

All units in the stack must be connecte d via st ac king cable. You can connect units in a simple cascade configuration, connecting Down ports to Up port s, from the top unit to the bottom unit. Using this “line” topology, if any link or unit in the stack fails, the stack is split and two separate segments are formed. The Stack Link LEDs on the units that are disconnected flash to indicate that the stack link between them is not functioning (see Table 1-2 "System Status LEDs" on page 1-4).

When using line topology and a stack link failure occurs, the stack reboots and a Master unit is selected within each of the two stack segments. The Master unit will be either the unit with the Master button depressed or the unit with the lowest MAC address if the Master button is not depressed on any unit. When the stack reboots and resumes operations, note that the IP address will be the same for both of the stack segments. To resolve the conflicting IP addresses, you should manually replace the failed link or unit as soon as possible. If you are using a wrap-around stack topology, a single point of failure in the stack will not cause the stack to fail. It

would take two or more points of failure to break the stack apart.

If the Master unit fails or is powered of f, t he backu p uni t wil l take control of the stack without any loss of configuration settings. The Slave unit with the lowest MAC address is selected as the backup unit.

Connecting to a Power Source

To connect a device to a power source:

1. Insert the power cable plug directly into the socket located at the back of the device.

Figure 3-8 Power Socket

2. Plug the other end of the cable into a grounded, 3-pin, AC power source.

Note: For international use, you may need to change the AC line cord. You must

use a line cord set that has been approved for the socket type in your country.

3-8

Connecting to the Console Port

3. Check the front-panel LEDs as the device is powered on to be sure the Power LED is on. If not, check that the power cable is correctly plugged in.

4. If you have purchased a Redundant Power Supply, connect it to the switch and to an AC power source now, following the instructions included with the package.

Connecting to the Console Port

The RJ-45 serial port on the switch’s front panel is used to connect to the switch for out-of-band console configuration. The on-board configuration program can be accessed from a terminal or a PC running a terminal emulation program. The pin assignments used to connect to the serial port are provided in the following table.

Figure 3-9 Serial Port (RJ-45) Pin-Out

Wiring Map for Serial Cable

Table 3-1 Serial Cable Wiring

Switch’s 8-Pin

Serial Port

6 RXD (receive data) <------------------- --------- 3 TXD (transmit data) 3 TXD (transmit data) -----------------------------> 2 RXD (receive data) 5 SGND (signal ground) ------------------------------ 5 SGND (signal ground) No other pins are used.

The serial port’s configuration requirements are as follows:

• Default Baud rate—9,600 bps

• Character Size—8 Characters

• Parity—None

• Stop bit—One

• Data bits—8

• Flow control—none

Null Modem PC’s 9-Pin

DTE Port

3-9

Installing the Switch

3-10

Chapter 4: Making Network Connections

Connecting Network Devices

This switch is designed to interconnect multiple segments (or collision domains). It can be connected to network cards in PCs and servers, as well as to hubs, switches or routers. It may also be connected to devices using optional XFP or SFP transceivers.

Twisted-Pair Devices

Each device requires an unshielded twisted-pair (UTP) cable with RJ-45 connectors at both ends. Use Category 5, 5e or 6 cable for 1 000BASE-T connections, Category 5 or better for 100BASE-TX connections, and Category 3 or better for 10BASE-T connections.

Cabling Guidelines

The RJ-45 ports on the switch support automatic MDI/ MDI-X pinout confi guration, so you can use standard straight-through twisted-pair cables to connect to any other network device (PCs, servers, switches, routers, or hubs).

See Appendix B for further information on cabling.

Caution: Do not plug a phone jack connector into an RJ-45 port. This will damage the

switch. Use only twisted-pair cables with RJ-45 connectors that conform to FCC standards.

4-1

Making Network Connections

Connecting to PCs, Servers, Hubs and Switches

1. Attach one end of a twisted-pair cable segment to the device’s RJ-45 connector.

Figure 4-1 Making Twisted-Pair Connections

2. If the device is a PC card and the switch is in the wiring closet, attach the other end of the cable segment to a modular wall outl et that is connect ed to the wiring closet. (See "Network Wiring Connections" on page 4-2.) Otherwise, attach the other end to an available port on the switch.

Make sure each twisted pair cable does not exceed 100 meters (328 ft) in length.

3. As each connection is made, the Link LED (on the switch) corresponding to each port will light green (1000 Mbps) or amber (10/100 Mbps) to indicate that the connection is valid.

Network Wiring Connections

Today, the punch-down block is an integral part of many of the newer equipment racks. It is actually part of the patch p anel. Instructions f or making connections in the wiring closet with this type of equipment follows.

1. Attach one end of a patch cable to an available port on the switch, and the other end to the patch panel.

2. If not already in place, attach one end of a cable segment to the back of the patch panel where the punch-down block is located, and the other end to a modular wall outlet.

3. Label the cables to simplify future troubleshooting. See "Cable Labeling and Connection Records" on page 8..

4-2

Fiber Optic SFP Devices

Equipment Rack (side view)

Network Switch

Patch Panel

Punch-Down Block

Wall

witch10/100

6724L3

Figure 4-2 Network Wiring Connections

Fiber Optic SFP Devices

An optional Gigabit SFP transceiver (1000BASE-SX, 1000BASE-LX or 1000BASE-LH) can be used for a backbone connection between switches, or for connecting to a high-speed server.

Each single-mode fiber port requires 9/125 micron single-mode fi ber optic cable with an LC connector at both ends. Each multimode fiber optic port requires 50/125 or

62.5/125 micron multimode fiber optic cabling with an LC connector at both ends.

Warning:These switches use lasers to transmit signals over fiber optic cable. The lasers

are compliant with the requirements of a Class 1 Laser Product and are inherently eye safe in normal operation. However, you should never look directly at a transmit port when it is powered on.

Note: When selecting a fiber SFP device, considering safety, please make sure that it

can function at a temperature that is not less than the recommended maximum operational temperature of the product. You must also use an approved Laser Class 1 SFP transceiver.

1. Remove and keep the LC port’s rubber cover. When not connected to a fiber cable, the rubber cover should be replaced to protect the optics.

2. Check that the fiber terminators are clean. You can clean the cable plugs by wiping them gently with a clean tissue or cotton ball moistened with a little ethanol. Dirty fiber terminators on fiber cables will impair the quality of the light transmitted through the cable and lead to degraded performance on the port.

4-3

Making Network Connections

3. Connect one end of the cable to the LC port on the switch a nd the other end to the LC port on the other device. Since LC connectors are keyed, the cable can be attached in only one orientation.

Figure 4-3 Making Connections to SFP Transceivers

4. As a connection is made, check the Link LED on the switch corresponding to the port to be sure that the connection is valid.

The 1000BASE-SX, 1000BASE-LX and 1000BASE-LH fiber optic ports operate at 1 Gbps full duplex. The maximum length for fibe r optic cable operating at Gigabit speed will depend on the fiber type as listed under "1000 Mbps Gigabit Ethernet Collision Domain" on page 4-7.

10 Gbps Fiber Optic Connections

An optional 10 Gigabit transceiver (XFP) can be used for a backbone connection between switches.

Single-mode fiber ports require 9/125 micron single-mode fiber optic cable. Multimode fiber optic ports require 50/125 or 62.5/125 micron multimode fiber optic cable. Each fiber optic cable must have an LC connector attached at both ends.

Warning:These switches use lasers to transmit signals over fiber optic cable. The lasers

are compliant with the requirements of a Class 1 Laser Product and are inherently eye safe in normal operation. However, you should never look directly at a transmit port when it is powered on.

Note: When selecting a fiber device, considering safety, please make sure that it can

function at a temperature that is not less than the recommended maximum operational temperature of the product. You must also use an approved Laser Class 1 SFP transceiver.

4-4

10 Gbps Fiber Optic Connections

1. Remove and keep the port’s protective cover. When not connected to a fiber cable, the cover should be replaced to protect the optics.

3. Connect one end of the cable to the LC port on the switch and the other end to the LC port on the other device. Since LC connectors are keyed, the cable can be attached in only one orientation.

Figure 4-4 Connecting to an XFP Transceiver

4. As a connection is made, check the Link LED on the module to be sure that the connection is valid.

The 10G fiber optic ports operate at 10 Gbps full duplex. The maximum length for fiber optic cable operating at 10 Gbps will depend on the fiber type as listed under "10 Gbps Ethernet Collision Domain" on page 4-6.

4-5

Making Network Connections

Connectivity Rules

When adding hubs (repeaters) to your network, please follow the connect ivity rules listed in the manuals for these products. However, note that because switches break up the path for connected devices into separate collision domains, you should not include the switch or connected cabling in your calculations for cascade length involving other devices.

1000BASE-T Cable Requirements

All Category 5 UTP cables that are used for 100BASE-TX connections should also work for 1000BASE-T, providing that all four wire pairs are connected. However, it is recommended that for all critical connections, or any new cable ins tallations, Category 5e (enhanced Category 5) or Category 6 cable should be used. The Category 5e specification includes test parameters that are only recommendations for Category 5. Therefore, the first step in preparing exis ting Category 5 cabling for running 1000BASE-T is a simple test of the cable installation to be sure that it complies with the IEEE 802.3-2005 standards.

10 Gbps Ethernet Collision Domain

Table 4-1 Maximum 10GBASE-SR 10 Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

62.5/125 micron single-mode fiber

50/125 micron single-mode fiber

160 MHz/km 2-26 m

(7-85 ft.)

200 MHz/km 2-33 m

(7-108 ft.)

400 MHz/km 2-66 m

(7-216 ft.)

500 MHz/km 2-82 m

(7-269 ft.)

2000 MHz/km 2-300 m

(7-984 ft.)

Table 4-2 Maximum 10GBASE-LR 10 Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

9/125 micron single-mode fiber

Table 4-3 Maximum 10GBASE-ER 10 Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

9/125 micron single-mode fiber

N/A 10 km (6.2 miles) LC

N/A 40 km (24.85 miles) LC

4-6

Connectivity Rules

1000 Mbps Gigabit Ethernet Collision Domain

Table 4-4 Maximum 1000BASE-T Gigabit Ethernet Cable Length

Cable Type Maximum Cable Length Connector

Category 5, 5e, 6 100-ohm UTP or STP 100 m (328 ft) RJ-45

Table 4-5 Maximum 1000BASE-SX Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

62.5/125 micron multimode fiber

50/125 micron multimode fiber

Table 4-6 Maximum 1000BASE-LX Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

9/125 micron single-mode fiber

Table 4-7 Maximum 1000BASE-LH Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

9/125 micron single-mode fiber

160 MHz/km 2-220 m (7-722 ft) LC 200 MHz/km 2-275 m (7-902 ft) LC 400 MHz/km 2-500 m (7-1641 ft) LC 500 MHz/km 2-550 m (7-1805 ft) LC

N/A 2 m - 5 km (7 ft - 3.2 miles) LC

N/A 2 m - 70 km (7 ft - 43.5 miles) LC

100 Mbps Fast Ethernet Collision Domain

Table 4-8 Maximum Fast Ethernet Cable Length

Type Cable Type Max. Cable Length Connector

100BASE-TX Category 5 or better 100-ohm UTP or STP 100 m (328 ft) RJ-45

10 Mbps Ethernet Collision Domain

Table 4-9 Maximum Ethernet Cable Length

Type Cable Type Maximum Length Connector

100ASE-T Twisted Pair, Cate gories 3, 4, 5 or bet ter

100-ohm UTP

100 m (328 ft) RJ-45

4-7

Making Network Connections

Cable Labeling and Connection Records

When planning a network installation, it is essenti al to label the opposing ends of cables and to record where each cable is connected. Doing so will enable you to easily locate inter-connected devices, isolate faults and change your topology without need for unnecessary time consumption.

To best manage the physical implementations of your network, follow these guidelines:

• Clearly label the opposing ends of each cable.

• Using your building’s floor plans, draw a map of the location of all network-connected equipment. For each piece of equipment, identify the devices to which it is connected.

• Note the length of each cable and the maximum cable length supported by the switch ports.

• For ease of understanding, use a location-based key when assigning prefixes to your cable labeling.

• Use sequential numbers for cables that originate from the same equipment.

• Differentiate between racks by naming accordingly.

• Label each separate piece of equipment.

• Display a copy of your equipment map, including keys to all abbreviations at each equipment rack.

4-8

Appendix A: Troubleshooting

Diagnosing Switch Indicators

Table A-1 Troubleshooting Chart

Symptom Action

Power LED is Off • Check connections between the switch, the power cord, and the wall

outlet.

• Contact your dealer for assistance.

Power LED is Amber • Internal power supply has failed. Contact your local dealer for

assistance.

Diag LED is Amber • Power cycle the switch to try and clear the condition.

• If the condition does not clear, contact yo ur local dealer for assistance .

Stack Master LED is Flashing Amber

Stack Link LED is Flashing Green/Amber

Link LED is Off • Verify that the switch and attached device are powered on.

• The stack has not completed its initial configuration. Wait a few minutes for the process to complete.

• Check that all stacking cables are properly connected.

• The uplink/downlink has failed.

• For the indicated stack link, check that the s tacking cables are properly connected. Replace the stacking cable if necessary.

• Power cycle the switch to try and clear the condition.

• Be sure the cable is plugged into both the switch and corresponding device.

• Verify that the proper cable type is used and its length does not exc eed specified limits.

• Check the adapter on the attached device and cable connections for possible defects. Replace the defective adapter or cab le if nec essary .

Diagnosing Power Problems with the LEDs

The Power and RPU LEDs work in combination to indicate power status as follo ws.

Table A-2 Power/RPS LEDs

Power LED RPU LED Status

Green Green Internal power functioning normally; RPU is present. Green Amber Internal power functioning normally; RPU plugged in but faulty. Green Off Internal power functioning normally; RPU not plugged in. Amber Green Internal power faulty; RPU delivering power. Off Off Both internal power and RPU unplugged or not functioning.

A-1

Troubleshooting

Power and Cooling Problems

If the power indicator does not turn on when the power cord is plugged in, you may have a problem with the power outlet, power cord, or internal power supply. However, if the unit powers off after running for a while, check for loose power connections, power losses or surges at the power outlet, and verify that the fans on the unit are unobstructed and running pri or to shutdown. I f you still canno t isolate the problem, then the internal power supply may be defective.

Installation

Verify that all system components have been properly installed. If one or more components appear to be malfunctioning (such as the power cord or network cabling), test them in an alternate environment where you are sure that all the other components are functioning properly.

In-Band Access

You can access the management agent in the switch from anywhere within the attached network using Telnet, a Web browser, or other network management software tools. However, you must first configure the switch with a valid IP address, subnet mask, and default gateway. If you have trouble establishing a link to the management agent, check to see if you have a valid network connection. Then verify that you entered the correct IP address. Also, be sure the port through which you are connecting to the switch has not been disabled. If it has not been disabled, then check the network cabling that runs between your remote location and the switch.

Caution: The management agent can accept up to four simultaneous Telnet sessions. If

the maximum number of sessions already exists, an additional Telnet connection will not be able to log into the system.

A-2

Stack Troubleshooting

If a stack fails to initialize or function, first check the following items:

• Check that all stacking cables are properly connected.

• Check if any stacking cables appear damaged.

• Check that only one Stack Master button is pressed in.

• Check that all switches in the stack are powered on.

After checking all items, reboot all the switches in the stack. Switches in the stack may be configured using a ring- or line-topology. To ensure

minimal disruption in case a unit or stacking cable fails, always use a ring-topology. When using ring-topology configuration and a switch fails, or a stacking cable is disconnected, the stack continues normal operatio n using line-topology stacking through the remaining stack connections.

If any changes occur to a slave unit, such as unit failure or insertion of a new unit, operation of the other units in the stack are not affected. On the other hand, if the master unit fails, the unit with the lowest MAC addres s is elected as the new ma ster. The stack reboots, discovers the new stack topology, assigns identifiers to each unit, and checks the software images on each unit. This process make take up to two minutes.

If you do not connect a wrap-around cable from the bottom unit back up to the top unit in the stack, the failure of a single unit will cause the stack to break into two separate stacks. In this case, a master unit will be elected for both of the stacks. However, backup information inherited from the previous master unit will cause the same IP address to be used by both master units in the two stac ks. You must therefore manually reconfigure the IP address of the management interface on one of the master units.

A-3

Troubleshooting

A-4

Appendix B: Cables

Twisted-Pair Cable and Pin Assignments

For 10/100BASE-TX connections, the twisted-pair cable must have two pairs of wires. For 1000BASE-T connections the twisted-pair cable must have four pairs of wires. Each wire pair is identified by two different colors. For example, one wire might be green and the other, green with white stripes. Also, an RJ-45 connector must be attached to both ends of the cable.

Caution: DO NOT plug a phone jack connector into any RJ-45 port. Use only

twisted-pair cables with RJ-45 connectors that conform with FCC standards.

Caution: Each wire pair must be attached to the RJ-45 connectors in a specific

orientation.

The figure below illustrates how the pins on the RJ-45 connector are numbered. Be sure to hold the connectors in the same orientation when attaching the wires to the pins.

Figure B-1 RJ-45 Connector Pin Numbers

10BASE-T/100BASE-TX Pin Assignments

Use unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for RJ-45 connections: 100-ohm Category 3, 4 or 5 cable fo r 10 Mbps co nnections or 100-ohm Category 5 cable for 100 Mbps connections. Also be sure twisted-pair connection does not exceed 100 meters (328 feet).

The RJ-45 ports on the switch base unit suppo rt automati c MDI/MDI-X operation , so you can use straight-through cables for all network connections t o PCs or servers, or to other switches or hubs. In straight-throu gh cable, pins 1, 2, 3, and 6, at o ne end of the cable, are connected straight through to pins 1, 2, 3, and 6 at the other end of the cable. When using any RJ-45 port on these switches, you can use either straight-through or crossover cable.

that the length of any

B-1

Cables

White/Orange Stripe

Orange

White/Green Stripe

Green

1 2 3 4 5 6 7 8

EIA/TIA 568B RJ-45 Wiring Standard

10/100BASE-TX Straight-through Cable

End A

End B

Blue

White/Blue Stripe

Brown

White/Brown Stripe

Table B-1 10/100BASE-TX MDI and MDI-X Port Pinouts

Pin MDI Signal Name MDI-X Signal Name

1 Transmit Data plus (TD+) Receive Data plus (RD+) 2 Transmit Data minus (TD-) Receive Data minus (RD-)

4,5,7,8

Receive Data plus (RD+) Transmit Data plus (TD+) Receive Data minus (RD-) Transmit Data minus (TD-) Not used Not used

Note: The “+” and “-” signs represent the polarity of the wires that make up each wire pair.

Straight-Through Wiring

If the twisted-pair cable is to join two ports and only one of the ports has an internal crossover (MDI-X), the two pairs of wires must be straight-through. (When auto-negotiation is enabled fo r any RJ-4 5 port on t hese switches, you ca n use eith er straight-through or crossover cable to connect to any device type.)

You must connect all four wire pairs as shown in the following diagram to support Gigabit Ethernet connections.

Figure B-2 Straight-through Wiring

Crossover Wiring

If the twisted-pair cable is to join two por ts and either both ports are labeled with an “X” (MDI-X) or neither port is labeled with an “X” (MDI), a crossover must be implemented in the wiring. (When auto-negotiation is enabled for any RJ-45 port on these switches, you can use either straight-throug h or crossover c able t o connect t o any device type.)

B-2

Twisted-Pair Cable and Pin Assignments

White/Orange Stripe

Orange

White/Green Stripe

1 2 3 4 5 6 7 8

EIA/TIA 568B RJ-45 Wiring Standard

10/100BASE-TX Crossover Cable

End A

End B

Green

Blue

White/Blue Stripe

Brown

White/Brown Stripe

You must connect all four wire pairs as shown in the following diagram to support Gigabit Ethernet connections.

Figure B-3 Crossover Wiring

1000BASE-T Pin Assignments

All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use straight-through cables for all network connections to PCs or servers, or to other switches or hubs.

The table below shows the 1000BASE-T MDI and MDI-X port pinouts. These ports require that all four pairs of wires be connected. Note that for 1000BASE-T operation, all four pairs of wires are used for both transmit and receive.

Use 100-ohm Category 5, 5e or 6 unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for 1000BASE-T connections. Also be sure of any twisted-pair connection does not exceed 100 meters (328 feet)

that the length

Table B-2 1000BASE-T MDI and MDI-X Port Pinouts

Pin MDI Signal Name MDI-X Signal Name

1 Bi-directional Pair A Plus (BI_DA+) Bi-directional Pair B Plus (BI_DB+) 2 Bi-directional Pair A Minus (BI_DA-) Bi-directional Pair B Minus (BI_DB-) 3 Bi-directional Pair B Plus (BI_DB+) Bi-directional Pair A Plus (BI_DA+) 4 Bi-directional Pair C Plus (BI_DC+) Bi-directional Pair D Plus (BI_DD+) 5 Bi-directional Pair C Minus (BI_DC-) Bi-directional Pair D Minus (BI_DD-) 6 Bi-directional Pair B Minus (BI_DB-) Bi-directional Pair A Minus (BI_DA-) 7 Bi-directional Pair D Plus (BI_DD+) Bi-directional Pair C Plus (BI_DC+) 8 Bi-directional Pair D Minus (BI_DD-) Bi-directional Pair C Minus (BI_DC-)

B-3

Cables

Cable Testing for Existing Category 5 Cable

Installed Category 5 cabling must pass tests for Attenuation, Near-End Crosstalk (NEXT), and Far-End Crosstalk (FEXT). This cable testing information is spec ified in the ANSI/TIA/EIA-TSB-67 standard. Additionally, cables must also pass test parameters for Return Loss and Equal-Level Far-End Crosstalk (ELFEXT). These tests are specified in the ANSI/TIA/EIA-TSB-95 Bulletin, “The Additional Transmission Performance Guidelines for 100 Ohm 4-Pair Category 5 Cabling.”

Note that when testing your cable installation, be sure to include all patch cables between switches and end devices.

Adjusting Existing Category 5 Cabling to Run 1000BASE-T

If your existing Category 5 installation does not meet one of the test parameters for 1000BASE-T, there are basically three measures that can be applied to try and correct the problem:

1. Replace any Category 5 patch cables with high-performance Category 5e or Category 6 cables.

2. Reduce the number of connectors used in the link.

3. Reconnect some of the connectors in the link.

Fiber Standards

The International Telecommunication Union (ITU-T) has standardized various fiber types for data networks. These are summarized in the following table.

Table B-3 Fiber Standards

ITU-T Standard

G.651 Multimode Fiber

G.652 Non-Dispersion-Shifted

G.652.C Low Water Peak

Description Application

Short-reach connections in the

50/125-micron core

FiberSingle-mode, 9/125-micron core

Non-Dispersion-Shifted Fiber

Single-mode, 9/125-micron core

1300-nm or 850-nm band. Longer spans and extended reach.

Optimized for operation in the 1310-nm band. but can also be used in the 1550-nm band.

Longer spans and extended reach. Optimized for wavelength-division multiplexing (WDM) transmission across wavelengths from 1285 to 1625 nm. The zero dispersion wavelength is in the 1310-nm region.

B-4

Table B-3 Fiber Standards

ITU-T Standard

G.653 Dispersion-Shifted Fiber

G.654 1550-nm Loss-Minimized

G.655 Non-Zero Dispersion-Shifted

Description Application

Single-mode, 9/125-micron core

FiberSingle-mode, 9/125-micron core

Fiber Standards

Longer spans and extended reach. Optimized for operation in the region from 1500 to 1600-nm.

Extended long-haul applications. Optimized for high-power transmission in the 1500 to 1600-nm region, with low loss in the 1550-nm band.

Extended long-haul applications. Optimized for high-power dense wavelength-division multiplexing (DWDM) operation in the region from 1500 to 1600-nm.

B-5

Cables

B-6

Appendix C: Specifications

Physical Characteristics

Ports

SMC8926EM:20 10/100/1000BASE-T, with auto-negotiation

4 10/100/1000BASE-T shared with 4 SFP transceiver slots 2 10GBASE extender module slots for XFP transceivers Two slots for stacking transceivers

SMC8950EM:44 10/100/1000BASE-T, with auto-negotiation

4 10/100/1000BASE-T shared with 4 SFP transceiver slots 2 10GBASE extender module slots for XFP transceivers Two slots for stacking transceivers

Network Interface

Ports 1-24/48: RJ-45 connector, auto MDI/X

10BASE-T: RJ-45 (100-ohm, UTP cable; Category 3 or better) 100BASE-TX: RJ-45 (100-ohm, UTP cable; Category 5 or better) 1000BASE-T: RJ-45 (100-ohm, UTP or STP cable; Category 5, 5e, or 6)

*Maximum Cable Length - 100 m (328 ft)

Buffer Architecture

SMC8926EM: 2 Mbytes SMC8950EM: 4 Mbytes

Aggregate Bandwidth

SMC8926EM: 138 Gbps SMC8950EM: 186 Gbps

Switching Database

16K MAC address entries, 1024 static MAC addresses; 2K IPv4 and 1K IPv6 entries in host table, 4K ARP entries, 256 IPv4 or 256 IPv6 entries in the IP routing table, 64 static IP routes, 32 IP interfaces; 255 multicast group s

LEDs

System: Stack Master, Stack Link, Module, Power, Diag, RPS Port: Status (link, speed, activity)

C-1

Specifications

Weight

SMC8926EM: 3.72 kg (8.20 lbs) SMC8950EM: 4.34 kg (9.57 lbs)

Size

44.0 x 33.1 x 4.4 cm (17.3 x 12.2 x 1.7 in.)

Temperature

Operating: 0 to 50 °C (32 to 122 °F) Storage: -40 to 70 °C (-40 to 158 °F)

Humidity

Operating: 5% to 95% (non-condensing)

AC Input

100 to 240 V, 50-60 Hz, 2A

Power Supply

Internal, auto-ranging transformer: 100 to 240 VAC, 47 to 63 Hz External, supports connection for redundant power supply

Power Consumption

SMC8926EM:49.6 Watts (without expansion modules)

63.96 Watts (with two expansion modules)

SMC8950EM:98.16 Watts (without expansion modules)

104.16 Watts (with two expansion modules)

Maximum Current

SMC8926EM:0.58 A @ 110 VAC (without exp ansion modules)

0.74 A @ 110 VAC (with two expansion XFP modules)

0.312 A @ 240 VAC (without expansion modules)

0.375 A @ 240 VAC (with two expansion XFP modules)

SMC8950EM:0.995 A @ 110 VAC (without expansion modules)

1.21 A @ 110 VAC (with two expansion XFP modules)

0.54 A @ 240 VAC (without expansion modules)

0.605 A @ 240 VAC (with two expansion XFP modules)

C-2

Switch Features

Forwarding Mode

Store-and-forward

Throughput

Wire speed

Flow Control

Full Duplex: IEEE 802.3x Half Duplex: Back pressure

Management Features

In-Band Management

Web, Telnet, SSH, or SNMP manager

Out-of-Band Management

RS-232 RJ-45 console port

Software Loading

TFTP in-band, or XModem out-of-band

Switch Features

Standards

IEEE 802.3-2005

Ethernet, Fast Ethernet, Gigabit Ethernet

Full-duplex flow control IEEE 802.3ae 10 Gigabit Ethernet IEEE 802.1D Spanning Tree Protocol IEEE 802.1w Rapid Spanning Tree Protocol IEEE 802.1s Multiple Spanning Tree Protocol IEEE 802.1Q Virtual LAN ISO/IEC 8802-3 CSMA/CD

C-3

Specifications

Compliances

CE Mark

Emissions

FCC Class A Industry Canada Class A EN55022 (CISPR 22) Class A EN 61000-3-2/3

Immunity

EN 61000-4-2/3/4/5/6/8/11

Safety

UL 60950-1 & CSA 60950-1 IEC 60950-1 & EN 60950-1

Extender Modules

10GBASE Extender Module (XFP)

Ports

1 slot for 10GBASE XFP transceiver

Communication Speed

10 Gbps

Communication Mode

Full duplex

Network Interface

XFP slot

Standards

IEEE 802.3ae 10 Gigabit Ethernet

C-4

Glossary

10BASE-T

IEEE 802.3 specification for 10 Mbps Ethernet over two pairs of Category 3, 4, or 5 UTP cable.

100BASE-TX

IEEE 802.3u specification for 100 Mbps Fast Ethernet over two pairs of Category 5 or better UTP cable.

1000BASE-LH

Long-haul Gigabit Ethernet over two strands of 9/125 micron core fiber cable.

1000BASE-LX

IEEE 802.3z specification for Gigabit Ethernet over two stran ds of 50/125, 62.5/125 or 9/125 micron core fiber cable.

1000BASE-SX

IEEE 802.3z specification for Gigabit Ethernet over two strands of 50/125 or 62.5/125 micron core fiber cable.

1000BASE-T

IEEE 802.3ab specification for Gigabit Ethernet over 100-ohm Category 5, 5e or 6 twisted-pair cable (using all four wire pairs).

10GBASE-ER

IEEE 802.3ae specification for 10 Gigabit Ethernet over two st rands of 9/125 micron core single-mode fiber cable.

10GBASE-LR

IEEE 802.3ae specification for 10 Gigabit Ethernet over two st rands of 9/125 micron core single-mode fiber cable.

10GBASE-SR

IEEE 802.3ae specification for 10 Gigabit Ethernet over two strands of 62.5/125 micron core multimode fiber cable.

10 Gigabit Ethernet

A 10 Gbps network communication system based on Ethernet.

Glossary-1

Glossary

Auto-Negotiation

Signalling method allowing each node to select its optimum operational mode (e.g., speed and duplex mode) based on the capabilities of the node to which it is connected.

Bandwidth

The difference between the highest and lowest frequencies available for network signals. Also synonymous with wire speed, the actual speed of the data transmission along the cable.

Collision

A condition in which packets transmitted over the cable interfere Their interference makes both signals unintelligible.

with each other.

Collision Domain

Single CSMA/CD LAN segment.

CSMA/CD

CSMA/CD (Carrier Sense Multiple Access/Collision Detect) is the communication method employed by Ethernet, Fast Ethernet, or Gigabit Ethernet.

End Station

A workstation, server, or other device that does not forward traffic.

Ethernet

A network communication system developed and standardized by DEC, Intel, and Xerox, using baseband transmission, CSMA/CD access, logical bus topology, and coaxial cable. The successor IEEE 802.3 standard provides for int egration into the OSI model and extends the physical layer and media with repeaters and implementations that operate on fiber, thin coax and twisted-pair cable.

Fast Ethernet

A 100 Mbps network communication system based on Ethernet and the CSMA/CD access method.

Full Duplex

Transmission method that allows two network devices to transmit and receive concurrently, effectively doubling the bandwidt h of that link.

Gigabit Ethernet

A 1000 Mbps network communication system based on Ethernet and the CSMA/CD access method.

Glossary-2

Glossary

IEEE

Institute of Electrical and Electronic Engineers.

IEEE 802.3

Defines carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications.

IEEE 802.3ab

Defines CSMA/CD access method and physical layer specifications for 1000BASE-T Gigabit Ethernet. (Now incorporated in IEEE 802.3-2005.)

IEEE 802.3ae

Defines the physical layer specifications for 10 Gigabit Ethernet .

IEEE 802.3u

Defines CSMA/CD access method and physical layer specifications for 100BASE-TX Fast Ethernet. (Now incorporated in IEEE 802.3-2005.)

IEEE 802.3z

Defines CSMA/CD access method and physical layer specifications for 1000BASE Gigabit Ethernet. (Now incorporated in IEEE 802.3-2005.)

LAN Segment

Separate LAN or collision domain.

LED

Light emitting diode used for monitoring a device or network condition.

Local Area Network (LAN)

A group of interconnected computer and support devices.

Media Access Control (MAC)

A portion of the networking protocol that governs access to the transmission medium, facilitating the exchange of data between network nodes.

MIB

An acronym for Management Information Base. It is a set of database objects that contains information about the device.

Modal Bandwidth

Bandwidth for multimode fiber is referred to as modal bandwidth because it varies with the modal field (or core diameter) of the fiber. Modal bandwidth is specified in

Glossary-3

Glossary

units of MHz per km, which indicates the amoun t of bandwid th supported by the f iber for a one km distance.

Network Diameter

Wire distance between two end stations in the same collision domain.

Redundant Power Supply (RPS)

A backup power supply unit that automatically takes over in case the primary po we r supply should fail.

RJ-45 Connector

A connector for twisted-pair wiring.

Switched Ports

Ports that are on separate collision domains or LAN segments.

TIA

Telecommunications Industry Association

Transmission Control Protocol/Internet Protocol (TCP/IP)

Protocol suite that includes TCP as the primary transport protocol, and IP as the network layer protocol.

UTP

Unshielded twisted-pair cable.

Virtual LAN (VLAN)

A Virtual LAN is a collection of network nodes that share the same collision domain regardless of their physical location or connection point in the network. A VLAN serves as a logical workgroup with no physical barriers, allowing users to share information and resources as though located on the same LAN.

Glossary-4

Index

Numerics

10 Gbps connectivity rules 4-6 10 Mbps connectivity rules 100 Mbps connectivity rules 1000 Mbps connectivity rules 1000BASE-LH fiber cable lengths 1000BASE-LX fiber cable lengths 1000BASE-SX fiber cable lengths 1000BASE-T

pin assignments ports

1-3

100BASE-TX

cable lengths ports

1-3

10BASE-T ports 10BASE-T/100BASE-TX pin

assignments 10GBASE-ER fiber cable length 10GBASE-LR

fiber cable length modules

10GBASE-SR

fiber cable length modules

adhesive feet, attaching 3-4 air flow requirements applications

collapsed backbone Layer 3 routing network aggregation remote connections VLAN connections

brackets, attaching 3-3 buffer size

cable

Ethernet cable compatibility labeling and connection records

4-7

1-3

B-1

1-6

2-6

C-1

4-7

B-3

4-6

3-1

2-2

2-3

2-4

2-5

3-1

4-7

4-6

4-8

lengths

4-6

cleaning fiber terminators compliances

EMC

C-4

safety

C-4

connectivity rules

10 Gbps 10 Mbps 100 Mbps

1000 Mbps console port, pin assignments contents of package cooling problems cord sets, international

DC input 1-5 desktop mounting device connections

electrical interference, avoiding 3-1 equipment checklist Ethernet connectivity rules expansion modules

Fast Ethernet connectivity rules 4-7 features

management

switch fiber cables full-duplex connectivity

IEEE 802.3 Ethernet 1-7 IEEE 802.3ae 10 Gigabit Ethernet IEEE 802.3u Fast Ethernet IEEE 802.3z Gigabit Ethernet indicators, LED installation

connecting devices to the switch

desktop or shelf mounting

4-6 4-7

4-7

A-2

C-3

1-7

1-6, 1-7

4-3

1-3

4-3, 4-5

3-9

3-2

3-8

3-4

4-1

3-2

4-6, 4-7

1-6

2-1

1-7

3-4

4-2

Index-1

Index

port connections 4-1 power requirements problems RPU in racks site requirements wiring closet connections

laser safety 4-3, 4-4 LC port connections LED indicators

Diag Module Power problems RPU Stack ID Stack Link Stack Master

location requirements

management

agent features out-of-band SNMP web-based

mounting the switch

on a desktop or shelf

multimode fiber optic cables

network

connections examples

optional modules, installation 3-5 optional redundant power unit out-of-band management

package contents 3-2 pin assignments

A-2

1-4

1-5

1-4

A-1

1-4

1-5

1-2

1-7, C-3, C-4

1-2

2-2

3-1

3-4

3-1

4-2

4-3, 4-4

1-5

3-1

3-4

4-3

4-1

1-5

1-2

B-1

1000BASE-T 10BASE-T/100BASE-TX console port

ports, connecting to power, connecting to problems, troubleshooting

rear panel receptacles 1-5 redundant power unit RJ-45 port

connections pinouts

RPU

connecting installing in a rack installing on a desktop optional redundant power unit

rubber foot pads, attaching

screws for rack mounting 3-2 site selelction SNMP agent specifications

compliances environmental extender modules physical power

standards, IEEE status LEDs surge suppressor, using switch architecture switching, introduction to

troubleshooting

in-band access power and cooling problems stack troubleshooting switch indicators Telnet

twisted-pair connections

B-3

B-1

3-9

4-1

3-8

A-1

1-5

1-3

4-1

B-3

3-9

3-4

3-5

3-4

3-1

1-2

C-4

C-2

C-4

C-1

C-2

C-3

1-3

3-1

1-2

2-1

A-2

A-3

A-1

A-2

4-1

1-5

A-2

Index-2

VLANs

routing

2-6

tagging

2-5

web-based management 1-2

Index

Index-3

Index

Index-4

SMC8926EM

SMC8950EM

150200062800A R02150200000054A R01

20 Mason • Irvine, CA 92618 • Phn: 949-679-8000 • www.smc.com

SMC Networks SMC8950EM, SMC8926EM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Chapter 1: Introduction

Overview

Switch Architecture

Network Management Options

SFP Slots

Optional Redundant Power Supply

Power Supply Sockets

Optional Media Extender Modules

10GBASE XFP Module

Extender Module LEDs

Features and Benefits

Connectivity

Expandability

Performance

Management

Chapter 2: Network Planning

Introduction to Switching

Application Examples

Collapsed Backbone

Network Aggregation Plan

Remote Connections with Fiber Cable

Making VLAN Connections

Using Layer 3 Routing

Application Notes

Chapter 3: Installing the Switch

Selecting a Site

Ethernet Cabling

Equipment Checklist

Package Contents

Optional Rack-Mounting Equipment

Mounting

Rack Mounting

Desktop or Shelf Mounting

Installing an Optional Module into the Switch

Installing an Optional SFP Transceiver

Connecting Switches in a Stack

Stacking Topologies

Connecting to a Power Source

Connecting to the Console Port

Wiring Map for Serial Cable

Chapter 4: Making Network Connections

Connecting Network Devices

Twisted-Pair Devices

Cabling Guidelines

Connecting to PCs, Servers, Hubs and Switches

Network Wiring Connections

Fiber Optic SFP Devices

10 Gbps Fiber Optic Connections

Connectivity Rules

1000BASE-T Cable Requirements

10 Gbps Ethernet Collision Domain

1000 Mbps Gigabit Ethernet Collision Domain

100 Mbps Fast Ethernet Collision Domain

10 Mbps Ethernet Collision Domain

Cable Labeling and Connection Records

Appendix A: Troubleshooting

Diagnosing Switch Indicators

Diagnosing Power Problems with the LEDs

Power and Cooling Problems

Installation

In-Band Access

Stack Troubleshooting

Appendix B: Cables

Twisted-Pair Cable and Pin Assignments

10BASE-T/100BASE-TX Pin Assignments

Straight-Through Wiring

Crossover Wiring

1000BASE-T Pin Assignments

Cable Testing for Existing Category 5 Cable

Adjusting Existing Category 5 Cabling to Run 1000BASE-T

Fiber Standards

Appendix C: Specifications

Physical Characteristics

Switch Features

Management Features

Standards