Digisol DG-GS4824F Installation Manual

Installation Guide

wwore.com

TM

DG-GS4824F

Layer 3 Gigabit SFP Managed Switch

Installation Guide

V1.0

2011-02-04

MUSTANG 4000 Managed Switch Series

As our product undergoes continuous development the specifications are subject to change without prior notice

I

NSTALLATION

G

UIDE

DG-GS4824F GIGABIT ETHERNET SWITCH

Layer 3 Switch
with 22 1000BASE-X SFP Ports,
and 2 Combination Gigabit (RJ-45/SFP) Ports

DG-GS4824F

E022011-R01

– 5 –

ABOUT THIS GUIDE

PURPOSE

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

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:

RELATED PUBLICATIONS

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.

N

OTE

:

Emphasizes important information or calls your attention to

related features or instructions.

C

AUTION

:

Alerts you to a potential hazard that could cause loss of data,

or damage the system or equipment.

W

ARNING

:

Alerts you to a potential hazard that could cause personal

injury.

A

BOUT THIS GUIDE

– 6 –

REVISION HISTORY

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

FEB 2011 REVISION

This is the first revision of this guide.

– 7 –

CONTENTS

ABOUT THIS GUIDE 5

C

ONTENTS 7

T

ABLES 9

F

IGURES 11

1I

NTRODUCTION 13

Overview 13

Description of Hardware 16

2NETWORK PLANNING 21

Introduction to Switching 21

Application Examples 22

Application Notes 26

3INSTALLING THE SWITCH 27

Selecting a Site 27

Ethernet Cabling 28

Equipment Checklist 29

Mounting 30

Installing an Optional SFP Transceiver 32

Grounding the Switch 34

Connecting to a Power Source 35

Connecting to the Console Port 36

4MAKING NETWORK CONNECTIONS 39

Connecting Network Devices 39

Twisted-Pair Devices 39

C

ONTENTS

– 8 –

Fiber Optic SFP Devices 41

Connectivity Rules 43

Cable Labeling and Connection Records 45

ATROUBLESHOOTING 47

Diagnosing Switch Indicators 47

Power and Cooling Problems 48

Installation 48

In-Band Access 48

BCABLES 49

Twisted-Pair Cable and Pin Assignments 49

Fiber Standards 53

CSPECIFICATIONS 55

Physical Characteristics 55

Switch Features 57

Management Features 57

Standards 58

GLOSSARY 59

I

NDEX 65

– 9 –

TABLES

Table 1: 1000 Mbps SFP Port Status LEDs (1~24) 18

Table 2: 1000 Mbps Shared RJ-45 Ports Status LEDs (1~2) 19

Table 3: System Status LEDs 19

Table 4: Serial Converter Wiring 36

Table 5: Maximum 1000BASE-T Gigabit Ethernet Cable Length 43

Table 6: Maximum 1000BASE-SX Gigabit Ethernet Cable Lengths 43

Table 7: Maximum 1000BASE-LX Gigabit Ethernet Cable Length 44

Table 8: Maximum 1000BASE-LH Gigabit Ethernet Cable Length 44

Table 9: Maximum 1000BASE-LHX Gigabit Ethernet Cable Length 44

Table 10: Maximum 1000BASE-ZX Gigabit Ethernet Cable Length 44

Table 11: Maximum 1000BASE-BX20 Gigabit Ethernet Cable Length 44

Table 12: Maximum 1000BASE-BX10 Gigabit Ethernet Cable Length 44

Table 13: Maximum Fast Ethernet Cable Lengths 45

Table 14: Maximum Ethernet Cable Length 45

Table 15: Troubleshooting Chart 47

Table 16: 10/100BASE-TX MDI and MDI-X Port Pinouts 50

Table 17: 1000BASE-T MDI and MDI-X Port Pinouts 52

Table 18: Fiber Standards 53

T

ABLES

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– 11 –

FIGURES

Figure 1: Front Panel 14

Figure 2: Rear Panel 14

Figure 3: Side Panel 15

Figure 4: Port LEDs 18

Figure 5: Power Supply Socket 20

Figure 6: Network Aggregation Plan 22

Figure 7: Remote Connections with Fiber Cable 23

Figure 8: Making VLAN Connections 24

Figure 9: IP Routing for Unicast Traffic 25

Figure 10: RJ-45 Connections 28

Figure 11: Attaching the Brackets 31

Figure 12: Installing the Switch in a Rack 31

Figure 13: Inserting an SFP Transceiver into a Slot 33

Figure 14: Grounding Point 34

Figure 15: Power Socket 35

Figure 16: Console Port Connection 36

Figure 17: Making Twisted-Pair Connections 40

Figure 18: Making Fiber Port Connections 42

Figure 19: RJ-45 Connector Pin Numbers 49

Figure 20: Straight-through Wiring 51

Figure 21: Crossover Wiring 51

F

IGURES

– 12 –

– 13 –

1 INTRODUCTION

OVERVIEW

The DG-GS4824F is an intelligent Layer 3 switch with 22 1000BASE-X SFP
transceiver slots, two Gigabit combination ports that are comprised of two
RJ-45 ports and two SFP transceiver slots.

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.

This switch 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.

This switch 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, this switch
can significantly improve the throughput between IP segments or VLANs.

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Overview

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Figure 1: Front Panel

Figure 2: Rear Panel

Port Status Indicators

1000BASE-T/SFP
Combination Ports

System Indicators

RJ-45 Console Port

1000BASE-X SFP Ports

Power Socket

Grounding Point

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Overview

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Figure 3: Side Panel

SWITCH ARCHITECTURE

This Gigabit Ethernet switch employs a wire-speed, non-blocking switching
fabric. This permits simultaneous wire-speed transport of multiple packets at low
latency on all ports. The switch also features full-duplex capability on all ports,
which effectively doubles the bandwidth of each connection.

For communications between different VLANs, the switch uses IP routing. For
communications within the same VLAN, it uses 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 before being
forwarded. This prevents errors from being propagated throughout the network.

Cooling Fans

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Description of Hardware

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NETWORK MANAGEMENT OPTIONS

With a comprehensive array of LEDs, the switch provides “at a glance”
monitoring of network and port status. The switch can be managed over the
network with a web browser or Telnet application, or via a direct connection to
the console port. The switch includes a built-in network management agent that
allows it to be managed in-band using SNMP or RMON (Groups 1, 2, 3, 9)
protocols. It also has an RJ-45 serial port on the front panel for out-of-band
management. A PC may be connected to this port for configuration and
monitoring out-of-band through a straight-through UTP or STP Ethernet cable
and the included RJ-45-to-DB-9 converter.

For a detailed description of the management features, refer to the Management
Guide.

DESCRIPTION OF HARDWARE

RJ-45 PORTS

The switch contains two combination RJ-45 ports that operate at 10 Mbps or
100 Mbps, half or full duplex, or at 1000 Mbps, full duplex. They are shared with
SFP ports 1~2. In its default configuration, if an SFP transceiver (purchased
separately) is installed in a slot and has a valid link on its port, the associated
RJ-45 port is disabled and cannot be used. The switch can also be configured to
force the use of an RJ-45 port or SFP slot, as required.

Because the RJ-45 ports support automatic MDI/MDI-X operation, you can use
straight-through cables for all network connections to PCs or servers, or to other
switches or hubs. (See “Twisted-Pair Cable and Pin Assignments” on page 49)

Each of these ports support auto-negotiation, so the optimum transmission
mode (half or full duplex), and data rate (10, 100, or 1000 Mbps) can be
selected automatically. If a device connected to one of these ports does not
support auto-negotiation, the communication mode of that port can be
configured manually.

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Description of Hardware

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SFP TRANSCEIVER SLOTS

The switch contains 24 Small Form Factor Pluggable (SFP) transceiver slots that
operate at 1000 Mbps full duplex. These slots support 1000 Mbps SFP Gigabit
Ethernet transceivers. The supported transceiver types are listed below:

u SFP 1000SX

u SFP 1000LX

u SFP 1000LHX

u SFP 1000ZX

u SFP 1000RJ-45

u SFP 1000BX20

u SFP 1000BX20D

u SFP 1000BX10

u SFP 1000BX10D

For information on the recommended standards for fiber optic cabling, see

“1000 Mbps Gigabit Ethernet Collision Domain” on page 43.

CONSOLE PORT

An RJ-45 serial console port is provided on the switch front panel for a
connection to a console device through a straight-through UTP or STP Ethernet
cable and an RJ-45-to-DB-9 converter. The console device can be a PC or
workstation running a VT-100 terminal emulator, or a VT-100 terminal.
An RJ-45-to-DB-9 converter is supplied with the unit for connecting to the
console port.

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Description of Hardware

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PORT AND SYSTEM STATUS LEDS

The switch includes a display panel for key system and port indications that
simplify installation and network troubleshooting. The LEDs, which are located
on the front panel for easy viewing, are shown below and described in the
following tables.

Figure 4: Port LEDs

Table 1: 1000 Mbps SFP Port Status LEDs (1~24)

LED Condition Status

(Link/Activity) On/Flashing Green Port has established a valid 1000 Mbps network

connection. Flashing indicates activity.

Off There is no valid link on the port.

SFP Port Status LEDs

System Status LEDs

RJ-45 Port Status LEDs

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Description of Hardware

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Table 2: 1000 Mbps Shared RJ-45 Ports Status LEDs (1~2)

LED Condition Status

(Link/Activity) On/Flashing Green Port has established a valid 1000 Mbps network

connection. Flashing indicates activity.

On/Flashing Amber Port has established a valid 10/100 Mbps network

connection. Flashing indicates activity.

Off There is no valid link on the port.

Table 3: System Status LEDs

LED Condition Status

Power On Green The unit’s internal power supply is operating

normally.

On Amber The unit has an internal power supply fault.

Off The unit has no power connected.

Diag On Green The system diagnostic test has completed

successfully.

Flashing Green The system diagnostic test is in progress.

On Amber After powering on, this indicates that the system

diagnostic test has detected a fault.

During operation, this indicates that an installed
SFP transceiver has failed.

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Description of Hardware

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POWER SUPPLY SOCKET

There is one power socket on the rear panel of the switch. The standard power
socket is for the AC power cord.

Figure 5: Power Supply Socket

– 21 –

2 NETWORK PLANNING

INTRODUCTION TO SWITCHING

A network switch allows simultaneous transmission of multiple packets via non­crossbar switching. This means that it can partition a network more efficiently
than bridges or routers. The switch has, therefore, been recognized as one of
the most important building blocks for today’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 this limitation.

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

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Application Examples

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APPLICATION EXAMPLES

The switch is not only designed to segment your network, but also to provide a
wide range of options in setting up network connections. Some typical
applications are described below.

NETWORK AGGREGATION PLAN

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

In the figure below, the 1000BASE-X SFP ports on the switch are providing 1000
Mbps connectivity for up to 24 segments. In addition, the switch is also
connecting several servers at 1000 Mbps.

Figure 6: Network Aggregation Plan

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Application Examples

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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 10 km, and a 1000BASE-LH link up to 80 km.
This allows the switch to serve as a collapsed backbone, providing direct
connectivity for a widespread LAN.

The figure below illustrates the switch connecting multiple segments with fiber
cable.

Figure 7: Remote Connections with Fiber Cable

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Application Examples

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MAKING VLAN CONNECTIONS

This switch supports 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 can 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.

Figure 8: Making VLAN Connections

N

OTE

:

When connecting to a switch that does not support IEEE 802.1Q

VLAN tags, use untagged ports.

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Application Examples

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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. This Gigabit Ethernet Switch is a routing switch 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 router
linked to the WAN. Just assign an IP address to any VLANs that need to
communicate. The switch will continue to segregate Layer 2 traffic based on
VLANs, but will now provide inter-VLAN connections for IP applications. The
switch 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.

Figure 9: IP Routing for Unicast Traffic

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Application Notes

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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 half-duplex
mode.

2. Avoid using flow control on a port connected to a hub unless it is actually

required to solve a problem. Otherwise back pressure jamming signals may
degrade overall performance for the segment attached to the hub.

3. Based on recommended standards, the length of fiber optic cable for a

single switched link should not exceed:

n

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

n

1000BASE-LX: 10 km (6.2 miles) for single-mode fiber.

n

1000BASE-LH: 80 km (49.7 miles) for single-mode fiber.

n

1000BASE-LHX: 40 km (24.8 miles) for single-mode fiber.

n

1000BASE-ZX: 100 km (62 miles) for single-mode fiber.

n

1000BASE-BX20: 20 km (12.4 miles) for single-mode fiber.

n

1000BASE-BX10: 10 km (6.2 miles) for single-mode fiber.

However, power budget constraints must also be considered when
calculating the maximum cable length for your specific environment.

– 27 –

3 INSTALLING THE SWITCH

SELECTING A SITE

Switch units can be mounted in a standard 19-inch equipment rack or on a flat
surface. Be sure to follow the guidelines below when choosing a location.

u The site should:

n

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

n

be able to maintain its temperature within 0 to 45 °C (32 to 113 °F)
and its humidity within 10% to 90%, non-condensing

n

provide adequate space (approximately two inches) on all sides for
proper air flow

n

be accessible for installing, cabling and maintaining the devices

n

allow the status LEDs to be clearly visible

u 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.

u 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 feet) of each
device and is powered from an independent circuit breaker. As with any
equipment, using a filter or surge suppressor is recommended.

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Ethernet Cabling

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ETHERNET CABLING

To ensure proper operation when installing the switch 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:

u 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.

u Protection from radio frequency interference emissions

u Electrical surge suppression

u Separation of electrical wires (switch related or other) and electromagnetic

fields from data based network wiring

u Safe connections with no damaged cables, connectors or shields

Figure 10: RJ-45 Connections

RJ-45 Connector

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Equipment Checklist

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EQUIPMENT CHECKLIST

After unpacking this 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

u Gigabit Ethernet Switch (DG-GS4824F)

u Power Cord

u Two rack-mounting brackets and eight screws

u RJ-45 to DB-9 serial converter (for console connection)

u Installation Guide and Management Guide CD

OPTIONAL RACK-MOUNTING EQUIPMENT

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

u Four mounting screws for each device you plan to install in a rack—these

are not included

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

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Mounting

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MOUNTING

This switch can be mounted in a standard 19-inch equipment rack or on a
desktop or shelf. Mounting instructions for each type of site follow.

RACK MOUNTING

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

u 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.

u Mechanical Loading: Do not place any equipment on top of a rack-mounted

unit.

u Circuit Overloading: Be sure that the supply circuit to the rack assembly is

not overloaded.

u 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.

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Mounting

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Figure 11: Attaching the Brackets

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

provided). Be sure to secure the lower rack-mounting screws first to
prevent the brackets being bent by the weight of the switch.

Figure 12: Installing the Switch in a Rack

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Installing an Optional SFP Transceiver

– 32 –

3. If installing a single switch only, turn to “Connecting to a Power Source” on

page 35.

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

in any order.

DESKTOP OR SHELF MOUNTING

The switch includes four pre-installed rubber feet for desktop or shelf mounting.

To mount devices on a horizontal surface, follow these steps:

1. 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.

2. If installing a single switch only, go to “Connecting to a Power Source” on

page 35.

3. If installing multiple switches, place each device squarely on top of the one

below, in any order.

INSTALLING AN OPTIONAL SFP TRANSCEIVER

The SFP slots support the following optional SFP transceivers:

u 1000BASE-SX

u 1000BASE-LX

u 1000BASE-LH

u 1000BASE-LHX

u 1000BASE-ZX

u 1000BASE-BX20

u 1000BASE-BX10

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Installing an Optional SFP Transceiver

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Figure 13: Inserting an SFP Transceiver into a Slot

To install an SFP transceiver, follow these steps:

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.

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:

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.

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SFP transceivers are not provided in the switch package.

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Grounding the Switch

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GROUNDING THE SWITCH

Before powering on the switch, ground the switch to earth as described below.

1. Ensure that the rack in which the switch is to be mounted is properly

grounded.

2. Ensure that there is a good electrical connection to the grounding point on

the rack (no paint or isolating surface treatment).

3. Disconnect all power cables to the switch.

4. The switch chassis is connected internally to 0 V. This circuit is connected to

the grounding terminal on the back of the switch (right corner). Attach
#6 AWG stranded copper wire to the grounding terminal on the switch.

5. Then attach the grounding wire to the ground point on the rack.

Figure 14: Grounding Point

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The earth connection must not be removed unless all supply

connections have been disconnected.

Grounding Point

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Connecting to a Power Source

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CONNECTING TO A POWER SOURCE

To connect a switch to a power source:

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

the switch.

Figure 15: Power Socket

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

3. Check the front-panel LEDs as the device is powered on to be sure the

Power LED is lit. If not, check that the power cable is correctly plugged in.

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OTE

:

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.

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Connecting to the Console Port

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CONNECTING TO THE CONSOLE PORT

This port is used to connect a console device to the switch through a straight­through UTP cable and an RJ-45-to-DB-9 serial converter. The console device
can be a PC or workstation running a VT-100 terminal emulator, or a VT-100
terminal. An RJ-45-to-DB-9 converter is supplied with the unit for connecting to
a RS-232 serial DB-9 DTE port, as illustrated below. The pin assignments used in
the RJ-45-to-DB-9 converter are described below.

Figure 16: Console Port Connection

WIRING MAP FOR SERIAL CONVERTER

The following table describes the pin connections for the RJ-45-to-DB-9 serial
converter. The converter should be used with straight-through UTP or STP
Ethernet cable.

Table 4: Serial Converter Wiring

8-PIN RJ-45 Port

(Switch Console Port)

Null Modem 9-PIN DB-9 Port

(PC’s DTE Com Port)

6 TXD (transmit data) ------------------------> 2 RXD (receive data)

3 RXD (receive data) <----------------------- 3 TXD (transmit data)

4 SGND (signal ground) -------------------------- 5 SGND (signal ground)

Straight-through
UTP Cable with
RJ-45 Connectors

Switch’s RJ-45
Console Port

PC’s DB-9 Com Port

RJ-45-to-DB-9
Serial Converter

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Connecting to the Console Port

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The serial port’s configuration requirements are as follows:

u Default Baud rate—115,200 bps

u Character Size—8 Characters

u Parity—None

u Stop bit—One

u Data bits—8

u Flow control—none

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Connecting to the Console Port

– 38 –

– 39 –

4 MAKING NETWORK CONNECTIONS

CONNECTING NETWORK DEVICES

The switch is designed to be connected remote devices using optional
1000BASE-SX, 1000BASE-LX, 1000BASE-LH, 1000BASE-LHX, 1000BASE-ZX,
1000BASE-BX20, or 1000BASE-BX10 SFP transceivers. It may also be connected
to 10, 100, or 1000 Mbps network cards in PCs and servers, as well as to other
switches and hubs.

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 1000BASE-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
configuration, 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.

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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.

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Twisted-Pair Devices

– 40 –

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 17: Making Twisted-Pair Connections

2. If the device is a network card and the switch is in the wiring closet, attach

the other end of the cable segment to a modular wall outlet that is
connected to the wiring closet. 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 or amber to indicate that the connection is valid.

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OTE

:

Avoid using flow control on a port connected to a hub unless it is
actually required to solve a problem. Otherwise back pressure jamming
signals may degrade overall performance for the segment attached to
the hub.

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Fiber Optic SFP Devices

– 41 –

FIBER OPTIC SFP DEVICES

An optional Gigabit SFP transceiver (1000BASE-SX, 1000BASE-LX, 1000BASE­LH, 1000BASE-LHX, 1000BASE-ZX, 1000BASE-BX20, or 1000BASE-BX10) 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 fiber 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.

1. Remove and keep the LC port’s rubber plug. When not connected to a fiber

cable, the rubber plug 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 optic cables will impair the quality
of the light transmitted through the cable and lead to degraded performance
on the port.

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.

W

ARNING

:

This switch uses 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.

W

ARNING

:

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.

C

HAPTER

4

| Making Network Connections

Fiber Optic SFP Devices

– 42 –

Figure 18: Making Fiber Port Connections

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 SFP fiber optic ports operate at 1 Gbps, full duplex, with auto-negotiation of
flow control. The maximum length for fiber optic cable operating at Gigabit
speed will depend on the fiber type as listed under "1000 Mbps Gigabit Ethernet

Collision Domain" on page 43.

C

HAPTER

4

| Making Network Connections

Connectivity Rules

– 43 –

CONNECTIVITY RULES

When adding hubs (repeaters) to your network, please follow the connectivity
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 installations,
Category 5e (enhanced Category 5) or Category 6 cable should be used. The
Category 5e and 6 specifications include test parameters that are only
recommendations for Category 5. Therefore, the first step in preparing existing
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.

1000 MBPS GIGABIT ETHERNET COLLISION DOMAIN

Table 5: Maximum 1000BASE-T Gigabit Ethernet Cable Length

Cable Type Maximum Cable Length Connector

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

Table 6: Maximum 1000BASE-SX Gigabit Ethernet Cable Lengths

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

62.5/125 micron
multimode fiber

160 MHz/km 2-220 m (7-722 ft) LC

200 MHz/km 2-275 m (7-902 ft) LC

50/125 micron
multimode fiber

400 MHz/km 2-500 m (7-1641 ft) LC

500 MHz/km 2-550 m (7-1805 ft) LC

C

HAPTER

4

| Making Network Connections

Connectivity Rules

– 44 –

Table 7: Maximum 1000BASE-LX Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

9/125 micron single­mode fiber

N/A 2 m - 10 km (7 ft - 6.2 miles) LC

Table 8: Maximum 1000BASE-LH Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

9/125 micron single­mode fiber

N/A 2 m - 80 km

(7 ft - 49.7 miles)

LC

Table 9: Maximum 1000BASE-LHX Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

9/125 micron single­mode fiber

N/A 2 m - 40 km

(7 ft - 24.8 miles)

LC

Table 10: Maximum 1000BASE-ZX Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

9/125 micron single­mode fiber

N/A 2 m - 100 km

(7 ft - 62 miles)

LC

Table 11: Maximum 1000BASE-BX20 Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

9/125 micron single­mode fiber

N/A 2 m - 20 km

(7 ft - 12.4 miles)

LC

Table 12: Maximum 1000BASE-BX10 Gigabit Ethernet Cable Length

Fiber Size Fiber Bandwidth Maximum Cable Length Connector

9/125 micron single­mode fiber

N/A 2 m - 10 km

(7 ft - 6.2 miles)

LC

C

HAPTER

4

| Making Network Connections

Cable Labeling and Connection Records

– 45 –

100 MBPS FAST ETHERNET COLLISION DOMAIN

10 MBPS ETHERNET COLLISION DOMAIN

CABLE LABELING AND CONNECTION RECORDS

When planning a network installation, it is essential 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:

u Clearly label the opposing ends of each cable.

u 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.

u Note the length of each cable and the maximum cable length supported by

the switch ports.

u For ease of understanding, use a location-based key when assigning

prefixes to your cable labeling.

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

u Differentiate between racks by naming accordingly.

Table 13: Maximum Fast Ethernet Cable Lengths

Type Cable Type Max. Cable Length Connector

100BASE-TX Category 5 or better 100-ohm

UTP or STP

100 m (328 ft) RJ-45

Table 14: Maximum Ethernet Cable Length

Type Cable Type Max. Cable Length Connector

10BASE-T Category 3 or better 100-ohm UTP 100 m (328 ft) RJ-45

C

HAPTER

4

| Making Network Connections

Cable Labeling and Connection Records

– 46 –

u Label each separate piece of equipment.

u Display a copy of your equipment map, including keys to all abbreviations at

each equipment rack.

– 47 –

A TROUBLESHOOTING

DIAGNOSING SWITCH INDICATORS

Table 15: Troubleshooting Chart

Symptom Action

Pwr LED is Off

u Check connections between the switch, the power cord and

the wall outlet.

u Contact your dealer for assistance.

Pwr LED is on Amber

u Contact your local dealer for assistance.

DIAG LED On Amber

u Power cycle the switch to try and clear the condition.
u If the condition does not clear, contact your dealer for

assistance.

Link LED is Off

u If an SFP transceiver has failed, replace it.
u Verify that the switch and attached device are powered on.
u Be sure the cable is plugged into both the switch and

corresponding device.

u If the switch is installed in a rack, check the connections to

the punch-down block and patch panel.

u Verify that the proper cable type is used and its length does

not exceed specified limits.

u Check the adapter on the attached device and cable

connections for possible defects. Replace the defective
adapter or cable if necessary.

A

PPENDIX

A

| Troubleshooting

Power and Cooling Problems

– 48 –

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. If you still
cannot isolate the problem, 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.

N

OTE

:

The management agent accepts 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.

– 49 –

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.

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 19: RJ-45 Connector Pin Numbers

C

AUTION

:

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.

C

AUTION

:

Each wire pair must be attached to the RJ-45 connectors in a
specific orientation.

8

1

1

8

A

PPENDIX

B

| Cables

Twisted-Pair Cable and Pin Assignments

– 50 –

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 or better cable for 10 Mbps connections, or
100-ohm Category 5 or better cable for 100 Mbps connections. Also be sure

that

the length of any twisted-pair connection does not exceed 100 meters (328 feet).

The RJ-45 ports on the switch base unit 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. In straight-through cable, pins 1, 2,
3, and 6, at one 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 this switch,
you can use either straight-through or crossover cable.

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 for any RJ-45 port on this switch, you can
use either 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.

Table 16: 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-)

3 Receive Data plus (RD+) Transmit Data plus (TD+)

6 Receive Data minus (RD-) Transmit Data minus (TD-)

4,5,7,8 Not used Not used

A

PPENDIX

B

| Cables

Twisted-Pair Cable and Pin Assignments

– 51 –

Figure 20: Straight-through Wiring

CROSSOVER WIRING

If the twisted-pair cable is to join two ports 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 this switch, you can use either 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.

Figure 21: Crossover Wiring

White/Orange Stripe

Orange

White/Green Stripe

Green

1
2
3
4
5
6
7
8

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

White/Orange Stripe

Orange

White/Green Stripe

1
2
3
4
5
6
7
8

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

A

PPENDIX

B

| Cables

Twisted-Pair Cable and Pin Assignments

– 52 –

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

that the

length of any twisted-pair connection does not exceed 100 meters (328 feet)

.

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 specified
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.

Table 17: 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-)

A

PPENDIX

B

| Cables

Fiber Standards

– 53 –

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 18: Fiber Standards

ITU-T
Standard

Description Application

G.651 Multimode Fiber

50/125-micron core

Short-reach connections in the 1300­nm or 850-nm band

G.652 Non-Dispersion-Shifted Fiber

Single-mode, 9/125-micron core

Longer spans and extended reach.
Optimized for operation in the 1310­nm band. but can also be used in the
1550-nm band

G.652.C Low Water Peak Non-

Dispersion-Shifted Fiber

Single-mode, 9/125-micron core

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.

G.653 Dispersion-Shifted Fiber

Single-mode, 9/125-micron core

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

A

PPENDIX

B

| Cables

Fiber Standards

– 54 –

G.654 1550-nm Loss-Minimized Fiber

Single-mode, 9/125-micron core

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

G.655 Non-Zero Dispersion-Shifted

Fiber

Single-mode, 9/125-micron core

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

Table 18: Fiber Standards (Continued)

ITU-T
Standard

Description Application

– 55 –

C SPECIFICATIONS

PHYSICAL CHARACTERISTICS

PORTS

24 1000BASE-SFP, with auto-negotiation
2 10/100/1000BASE-T, shared with two SFP transceiver slots

NETWORK INTERFACE

Ports 1-24: SFP connector
Shared Ports 1-2: 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

0.75 Mbyte packet buffer

AGGREGATE BANDWIDTH

48 Gbps

SWITCHING DATABASE

8K MAC address entries

LEDS

System:DIAG (Diagnostic), Pwr (Power)
Port:

status (link, speed, and activity)

A

PPENDIX

C

| Specifications

Physical Characteristics

– 56 –

WEIGHT

3.55 kg (7.83 lbs)

SIZE

(W x D x H): 270 x 440 x 41.7 mm (10.63 x 17.32 x 1.64 inches)

TEMPERATURE

Operating: 0°C to 45°C (32°F to 113°F)
Storage: -40°C to 70°C (-40°F to 158°F)

HUMIDITY

Operating: 10% to 90% (non-condensing)

AC INPUT

100 to 240 V, 50-60 Hz, 1A

POWER SUPPLY

Internal, auto-ranging transformer: 100 to 240 VAC, 50 to 60 Hz

POWER CONSUMPTION

40 Watts maximum

MAXIMUM CURRENT

0.4 A @ 100 VAC

0.2 A @ 240 VAC

A

PPENDIX

C

| Specifications

Switch Features

– 57 –

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

SSH, Telnet, SNMP, or HTTP

OUT-OF-BAND MANAGEMENT

RS-232 RJ-45 console port

SOFTWARE LOADING

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

A

PPENDIX

C

| Specifications

Standards

– 58 –

STANDARDS

IEEE 802.3-2005

Ethernet, Fast Ethernet, Gigabit Ethernet
Full-duplex flow control
Link Aggregation Control Protocol

IEEE 802.1D -2004

Spanning Tree Protocol
Rapid Spanning Tree Protocol
Multiple Spanning Tree Protocol

ISO/IEC 8802-3

– 59 –

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 Ethernet over two pairs of Category 5
UTP cable.

1000BASE-LH

Specification for 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 strands 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).

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.

G

LOSSARY

– 60 –

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 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, and 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 integration
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 bandwidth of that link.

GIGABIT ETHERNET

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

G

LOSSARY

– 61 –

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 802.3U

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

IEEE 802.3X

Defines Ethernet frame start/stop requests and timers used for flow control on
full-duplex links. (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.

G

LOSSARY

– 62 –

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 units of MHz per km, which indicates the amount of bandwidth
supported by the fiber for a one km distance.

NETWORK DIAMETER

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

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.

G

LOSSARY

– 63 –

USER DATAGRAM PROTOCOL (UDP)

UDP provides a datagram mode for packet-switched communications. It uses IP

as the underlying transport mechanism to provide access to IP-like services.
UDP packets are delivered just like IP packets – connection-less datagrams that
may be discarded before reaching their targets. UDP is useful when TCP would
be too complex, too slow, or just unnecessary.

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.

G

LOSSARY

– 64 –

– 65 –

INDEX

NUMERICS

10 Mbps connectivity rules 45
100 Mbps connectivity rules 44
1000 Mbps connectivity rules 43
1000BASE-LH fiber cable Lengths 44
1000BASE-LX fiber cable Lengths 44
1000BASE-SX fiber cable Lengths 43
1000BASE-T

pin assignments

52

ports 16
100BASE-TX, cable lengths 45
10BASE-T, cable lengths 45

A

air flow requirements 27
applications

central wiring closet

22

collapsed backbone 22

remote connections with fiber 23

VLAN connections 24

B

buffer size 55

C

cable

Ethernet cable compatibility

28

fiber standards 53

labeling and connection records 45

lengths 45
cleaning fiber terminators 41
connectivity rules

10 Mbps

45

100 Mbps 44

1000 Mbps 43
console port, pin assignments 36
contents of package 29
cooling problems 48
cord sets, international 35

D

desktop mounting 32
device connections 39

E

electrical interference, avoiding 27
equipment checklist 29
Ethernet connectivity rules 45

F

Fast Ethernet connectivity rules 44
features 57
fiber cables 41
front panel of switch 14
full duplex connectivity 21

G

Gigabit Ethernet cable lengths 43

I

indicators, LED 18
installation

connecting devices to the switch

40

desktop or shelf mounting 32
network wiring connections 41
port connections 39, 41
power requirements 27
problems 48
rack mounting 32
site requirements 27

L

laser safety 41
LC port connections 41
LED indicators

DIAG

19

PWR 19

location requirements 27

M

management

agent

16

features 57
out-of-band 16
SNMP 16
web-based 16

I

NDEX

– 66 –

mounting the switch

in a rack

32

on a desktop or shelf 32
multimode fiber optic cables 41

N

network

connections

39, 41

examples 22

O

out-of-band management 16

P

package contents 29
pin assignments 49

1000BASE-T 52

10BASE-T/100BASE-TX 50

console port 36, 37
ports, connecting to 39, 41
power, connecting to 35

R

rack mounting 32
rear panel of switch 14
rear panel socket 20
RJ-45 port 16

connections 39

pinouts 52
RMON 16
RS-232 port 16

S

serial

port

16

SFP transceiver slots 17
single-mode fiber optic cables 41
site selelction 27
SNMP agent 16
specifications

environmental

56

power 56
standards

IEEE

58

status LEDs 18
surge suppressor, using 27
switch architecture 15

T

Telnet 48
troubleshooting

in-band access

48

power and cooling problems 48

twisted-pair connections 39

V

VLANS, tagging 24

W

web-based management 16

DG-GS4824F

E022011-R01