D-Link DES-3225G Series User manual

DES-3225G Series
24-Port Fast Ethernet
Switch
User’s Guide
Sixth Edition (December 2001)
651S3225G065
Printed In Taiwan
RECYCLABLE

Wichtige Sicherheitshinweise
1. Bitte lesen Sie sich diese Hinweise sorgfältig durch.
2. Heben Sie diese Anleitung für den spätern Gebrauch auf.
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1. Zum Netzanschluß dieses Gerätes ist eine geprüfte Leitung zu verwenden, Für einen Nennstrom bis 6A und einem Gerätegewicht grßer 3kg ist eine
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D-Link Offices for Registration and Warranty Service
The product's Registration Card, provided at the back of this manual, must be sent to a D-Link office. To obtain an RMA
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FCC Warning
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 this user’s guide, 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.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device
may not cause harmful interference, and (2) this device must accept any interference received, including interference that
may cause undesired operation.
CE Mark Warning
This is a Class A product. In a domestic environment, this product may cause radio interference in which case the user may
be required to take adequate measures.
Warnung!
Dies ist in Produkt der Klasse A. Im Wohnbereich kann dieses Produkt Funkstoerungen verursachen. In diesem Fall kann
vom Benutzer verlangt werden, angemessene Massnahmen zu ergreifen.
Precaución!
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requerirse al usuario para que adopte las medidas adecuadas.
Attention!
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auquel cas l`utilisateur devrait prendre les mesures adéquates.
Attenzione!
Il presente prodotto appartiene alla classe A. Se utilizzato in ambiente domestico il prodotto può causare interferenze
radio, nel cui caso è possibile che l`utente debba assumere provvedimenti adeguati.
VCCI Warning
BSMI Warning

Table of Contents
INTRODUCTION...............................................................................................................................................................................................1
FAST ETHERNET TECHNOLOGY ...................................................................................................................................................................1
GIGABIT ETHERNET TECHNOLOGY .............................................................................................................................................................1
SWITCHING TECHNOLOGY ............................................................................................................................................................................2
FEATURES.........................................................................................................................................................................................................2
Ports...............................................................................................................................................................................................................2
Performance features..................................................................................................................................................................................3
Management.................................................................................................................................................................................................3
UNPACKING AND SETUP...............................................................................................................................................................................4
UNPACKING......................................................................................................................................................................................................4
INSTALLATION................................................................................................................................................................................................4
Desktop or Shelf Installation....................................................................................................................................................................4
Rack Installation.........................................................................................................................................................................................5
POWER ON........................................................................................................................................................................................................6
Power Failure..............................................................................................................................................................................................6
IDENTIFYING EXTERNAL COMPONENTS................................................................................................................................................7
FRONT PANEL..................................................................................................................................................................................................7
REAR PANEL.....................................................................................................................................................................................................7
SIDE PANELS....................................................................................................................................................................................................8
OPTIONAL PLUG-IN MODULES.....................................................................................................................................................................8
100BASE-TX Module..................................................................................................................................................................................9
100BASE-FX (SC) Fiber Module.............................................................................................................................................................9
100BASE-FX (MT-RJ) Fiber Module......................................................................................................................................................9
1000BASE-SX Gigabit Module...............................................................................................................................................................10
1000BASE-LX Gigabit Module...............................................................................................................................................................10
1000BASE-T Copper Gigabit Module...................................................................................................................................................11
LED INDICATORS...........................................................................................................................................................................................11
CONNECTING THE SWITCH.......................................................................................................................................................................12
SWITCH TO END NODE................................................................................................................................................................................12
SWITCH TO HUB OR SWITCH......................................................................................................................................................................12
10BASE-T Device.......................................................................................................................................................................................13
100BASE-TX Device..................................................................................................................................................................................13
SWITCH MANAGEMENT CONCEPTS ......................................................................................................................................................14
LOCAL CONSOLE MANAGEMENT...............................................................................................................................................................14
Diagnostic (console) port (RS-232 DCE) ............................................................................................................................................14
IP ADDRESSES AND SNMP COMMUNITY NAMES....................................................................................................................................15
TRAPS..............................................................................................................................................................................................................15
MIBS................................................................................................................................................................................................................16
PACKET FORWARDING.................................................................................................................................................................................16
Aging Time..................................................................................................................................................................................................16
Filtering Database....................................................................................................................................................................................17
SPANNING TREE ALGORITHM....................................................................................................................................................................17
STA Operation Levels...............................................................................................................................................................................17
On the Bridge Level................................................................................................................................................................................18
On the Port Level....................................................................................................................................................................................18
User-Changeable STA Parameters.........................................................................................................................................................18
Illustration of STA.....................................................................................................................................................................................19

PORT TRUNKING............................................................................................................................................................................................20
VLANS AND BROADCAST DOMAINS..........................................................................................................................................................21
MAC-based Broadcast Domains.............................................................................................................................................................22
802.1Q VLANs............................................................................................................................................................................................22
802.1Q VLAN Segmentation.................................................................................................................................................................22
Sharing Resources Across 802.1Q VLANs ........................................................................................................................................23
802.1Q VLANs Spanning Multiple Switches......................................................................................................................................23
Port-based VLANs.....................................................................................................................................................................................25
BROADCAST STORMS....................................................................................................................................................................................25
Segmenting Broadcast Domains.............................................................................................................................................................26
Eliminating Broadcast Storms................................................................................................................................................................26
USING THE CONSOLE INTERFACE...........................................................................................................................................................27
SETTING UP A CONSOLE.............................................................................................................................................................................27
CONNECTING TO THE SWITCH USING TELNET.......................................................................................................................................28
CONSOLE USAGE CONVENTIONS.................................................................................................................................................................28
FIRST TIME CONNECTING TO THE SWITCH.............................................................................................................................................28
User Accounts Management....................................................................................................................................................................30
Saving Changes.........................................................................................................................................................................................30
LOGGING ONTO THE SWITCH CONSOLE BY REGISTERED USERS.........................................................................................................31
Create/Modify User Accounts.............................................................................................................................................................31
View/Delete User Accounts..................................................................................................................................................................33
SETTING UP THE SWITCH...........................................................................................................................................................................34
Configuration.............................................................................................................................................................................................34
Configure IP Address............................................................................................................................................................................34
Configure Console..................................................................................................................................................................................36
Configure Switch....................................................................................................................................................................................37
Configure Ports.......................................................................................................................................................................................38
Configure Slot1 Module ........................................................................................................................................................................40
Configure Slot2 Module ........................................................................................................................................................................42
Configure Port Mirroring.......................................................................................................................................................................43
Configure Spanning Tree Protocol......................................................................................................................................................44
Configure Filtering and Forwarding Table..........................................................................................................................................47
Configure IGMP Filtering......................................................................................................................................................................50
Configure VLANs & MAC-based Broadcast Domains....................................................................................................................54
Configure Trunk......................................................................................................................................................................................75
Update Firmware and Configuration Files..........................................................................................................................................76
System Utilities...........................................................................................................................................................................................77
Ping Test..................................................................................................................................................................................................78
Save Settings to TFTP Server...............................................................................................................................................................79
Save Switch History to TFTP Server...................................................................................................................................................80
SNMP Manager Configuration..............................................................................................................................................................81
SWITCH MONITORING.................................................................................................................................................................................82
Network Monitoring.................................................................................................................................................................................82
Traffic Statistics......................................................................................................................................................................................83
Browse Address Table ..........................................................................................................................................................................89
Browse IGMP Status..............................................................................................................................................................................90
Browse GVRP Status..............................................................................................................................................................................91
Browse GMRP Status.............................................................................................................................................................................91
Switch History.........................................................................................................................................................................................92
RESETTING THE SWITCH.............................................................................................................................................................................93
Restart System............................................................................................................................................................................................93
Factory Reset..............................................................................................................................................................................................94
Logout..........................................................................................................................................................................................................95
WEB-BASED NETWORK MANAGEMENT...............................................................................................................................................96
INTRODUCTION.............................................................................................................................................................................................96

GETTING STARTED.......................................................................................................................................................................................96
MANAGEMENT ..............................................................................................................................................................................................96
Configure Switch.......................................................................................................................................................................................97
IP Settings................................................................................................................................................................................................98
Port Settings............................................................................................................................................................................................99
Port Mirroring........................................................................................................................................................................................100
Switch Settings.....................................................................................................................................................................................101
Filtering and Forwarding Table ..........................................................................................................................................................103
Spanning Tree.......................................................................................................................................................................................110
IGMP Filtering.......................................................................................................................................................................................113
VLANs & MAC-based Broadcast Domains.....................................................................................................................................115
Trunk......................................................................................................................................................................................................123
Configure Management.........................................................................................................................................................................123
Traps and Community Strings............................................................................................................................................................124
User Accounts......................................................................................................................................................................................125
Console Port Settings..........................................................................................................................................................................127
Monitor.....................................................................................................................................................................................................128
Switch Overview...................................................................................................................................................................................128
Port Statistics ........................................................................................................................................................................................129
Browse Address Table ........................................................................................................................................................................134
Browse IGMP Status............................................................................................................................................................................138
Browse GVRP Status............................................................................................................................................................................139
Browse GMRP Status...........................................................................................................................................................................140
Switch History.......................................................................................................................................................................................141
Reset and Update....................................................................................................................................................................................141
Reboot Switch.......................................................................................................................................................................................142
Reset to Factory Default......................................................................................................................................................................143
Update Firmware...................................................................................................................................................................................144
Change Configuration File ..................................................................................................................................................................145
Save Settings to TFTP Server.............................................................................................................................................................146
Upload Log File.....................................................................................................................................................................................147
Save Changes..........................................................................................................................................................................................148
Help...........................................................................................................................................................................................................148
TECHNICAL SPECIFICATIONS...............................................................................................................................................................149
RJ-45 PIN SPECIFICATION......................................................................................................................................................................152
SAMPLE CONFIGURATION FILE............................................................................................................................................................154
Commands:............................................................................................................................................................................................154
Notes about the Configuration File:..................................................................................................................................................154
RUNTIME SWITCHING SOFTWARE DEFAULT SETTINGS .............................................................................................................156
INDEX..............................................................................................................................................................................................................158

24-port NWay Ethernet Switch User’s Guide
ABOUT THIS GUIDE
This User’s Guide tells you how to install your DES-3225G Series Switch, how to connect it to your Ethernet network, and
how to set its configuration using either the built-in console interface or Web-based management.
Terms
For simplicity, this documentation uses the terms “Switch” (first letter upper case) to refer to the DES-3225G Series 24-
port NWay Ethernet Switch, and “switch” (first letter lower case) to refer to all Ethernet switches, including the DES-
3225G.
Overview of this User’s Guide
♦Chapter 1, “Introduction.” Describes the Switch and its features.
♦Chapter 2, “Unpacking and Setup.” Helps you get started with the basic installation of the Switch.
♦Chapter 3, “Identifying External” Components. Describes the front panel, rear panel, optional plug-in modules,
and LED indicators of the Switch.
♦Chapter 4, “Connecting the Switch.” Tells how you can connect the DES-3225G to your Ethernet network.
♦Chapter 5, “Switch Management Concepts.” Talks about Local Console Management via the RS-232 DCE console
port and other aspects about how to manage the Switch.
♦Chapter 6, “Using the Console Interface.” Tells how to use the built-in console interface to change, set, and
monitor Switch performance and security.
♦Chapter 7, “Web-Based Network Management.” Tells how to manage the Switch through an Internet browser.
♦Appendix A, “Technical Specifications.” Lists the technical specifications of the DES-3225G.
♦Appendix B, “RJ-45 Pin Specifications. Shows the details and pin assignments for the RJ-45 receptacle/connector.
♦Appendix C, “Sample Configuration File.”
♦Appendix D, “Runtime Switch Software Default Settings.”

24-port NWay Ethernet Switch User’s Guide
Introduction 1
1
INTRODUCTION
This section describes the features of the Switch, as well as giving some background information about Ethernet/Fast
Ethernet, Gigabit Ethernet, and switching technology.
Fast Ethernet Technology
The growing importance of LANs and the increasing complexity of desktop computing applications are fueling the need for
high performance networks. A number of high-speed LAN technologies are proposed to provide greater bandwidth and
improve client/server response times. Among them, Fast Ethernet, or 100BASE-TX, provides a non-disruptive, smooth
evolution from the current 10BASE-T technology. The dominating market position virtually guarantee cost effective and
high performance Fast Ethernet solutions in the years to come.
100Mbps Fast Ethernet is a standard specified by the IEEE 802.3 LAN committee. It is an extension of the 10Mbps
Ethernet standard with the ability to transmit and receive data at 100Mbps, while maintaining the Carrier Sense
Multiple Access with Collision Detection (CSMA/CD) Ethernet protocol.
Gigabit Ethernet Technology
Gigabit Ethernet is an extension of IEEE 802.3 Ethernet utilizing the same packet structure, format, and support for
CSMA/CD protocol, full duplex, flow control, and management objects, but with a tenfold increase in theoretical
throughput over 100Mbps Fast Ethernet and a one hundred-fold increase over 10Mbps Ethernet. Since it is compatible
with all 10Mbps and 100Mbps Ethernet environments, Gigabit Ethernet provides a straightforward upgrade without
wasting a company’s existing investment in hardware, software, and trained personnel.
The increased speed and extra bandwidth offered by Gigabit Ethernet is essential to coping with the network bottlenecks
that frequently develop as computers and their busses get faster and more users use applications that generate more
traffic. Upgrading key components, such as your backbone and servers to Gigabit Ethernet can greatly improve network
response times as well as significantly speed up the traffic between your subnets.
Gigabit Ethernet enables fast optical fiber connections to support video conferencing, complex imaging, and similar data-
intensive applications. Likewise, since data transfers occur 10 times faster than Fast Ethernet, servers outfitted with
Gigabit Ethernet NIC’s are able to perform 10 times the number of operations in the same amount of time.
In addition, the phenomenal bandwidth delivered by Gigabit Ethernet is the most cost-effective method to take advantage
of today and tomorrow’s rapidly improving switching and routing internetworking technologies. And with expected
advances in the coming years in silicon technology and digital signal processing that will enable Gigabit Ethernet to
eventually operate over unshielded twisted-pair (UTP) cabling, outfitting your network with a powerful 1000Mbps-capable
backbone/server connection creates a flexible foundation for the next generation of network technology products.

24-port NWay Ethernet Switch User’s Guide
2Introduction
Switching Technology
Another key developmentpushing the limits of Ethernet technology is in the field of switching technology. A switch bridges
Ethernet packets at the MAC address level of the Ethernet protocol transmitting among connected Ethernet or fast
Ethernet LAN segments.
Switching is a cost-effective way of increasing the total network capacity available to users on a local area network. A
switch increases capacity and decreases network loading by making it possible for a local area network to be divided into
different segments which don’t compete with each other for network transmission capacity, giving a decreased load on
each.
The switch acts as a high-speed selective bridge between the individual segments. Traffic that needs to go from one
segment to another (from one port to another) is automatically forwarded by the switch, without interfering with any other
segments (ports). This allows the total network capacity to be multiplied, while still maintaining the same network
cabling and adapter cards.
For Fast Ethernet or Gigabit Ethernet networks, a switch is an effective way of eliminating problems of chaining hubs
beyond the “two-repeater limit.” A switch can be used to split parts of the network into different collision domains, for
example, making it possible to expand your Fast Ethernet network beyond the 205-meter network diameter limit for
100BASE-TX networks. Switches supporting both traditional 10Mbps Ethernet and 100Mbps Fast Ethernet are also ideal
for bridging between existing 10Mbps networks and new 100Mbps networks.
Switching LAN technology is a marked improvement over the previous generation of network bridges, which were
characterized by higher latencies. Routers have also been used to segment local area networks, but the cost of a router and
the setup and maintenance required make routers relatively impractical. Today’s switches are an ideal solution to most
kinds of local area network congestion problems.
Features
The DES-3225G Switch was designed for easy installation and high performance in an environment where traffic on the
network and the number of users increase continuously.
Switch features include:
Ports
♦24 high performance NWay ports all operating at 10/100 Mbps for connecting to end stations, servers, and hubs (22
MDI-X 10/100 Ethernet UTP ports and 2 MDI-II Uplink ports).
♦All ports can auto-negotiate (NWay) between 10Mbps/ 100Mbps, half-duplex or full duplex and flow control.
♦One optional rear panel slide-in module interface for a 1-port 1000BASE-SX Gigabit Ethernet module, a 1-port
1000BASE-LX Gigabit Ethernet module, or a 1-port 1000BASE-T Gigabit Ethernet module, for connecting to
another switch.
♦One slide-in module interface in the front panel for 1 or 2 port 10/100M Ethernet connection. Three modules are
available: 2 ports TX module, 2 ports FX MT-RJ type module, and 1 port FX SC type module.
♦RS-232 DCE Diagnostic port (console port) for setting up and managing the Switch via a connection to a console
terminal or PC using a terminal emulation program.

24-port NWay Ethernet Switch User’s Guide
Introduction 3
Performance features
♦Store and forward switching scheme capability to support rate adaptation and protocol conversion.
♦Full- and half-duplex for both 10Mbps and 100Mbps connections. The 1000BASE-SX and 1000BASE-LX Gigabit
Ethernet modules operate at full duplex only while the 1000BASE-T Gigabit Ethernet module can also operate in
half-duplex mode when auto negotiate is selected. Full duplex allows the switch port to simultaneously transmit
and receive data, and only works with connections to full-duplex capable end stations and switches. Connections to
hubs must take place at half duplex.
♦Auto-polarity detection and correction of incorrect polarity on the receive twisted-pair at each port.
♦Data forwarding rate 14,880 pps per port at 100% of wire-speed for 10Mbps speed.
♦Data forwarding rate 148,800 pps per port at 100% of wire-speed for 100Mbps speed.
♦Data filtering rate eliminates all error packets, runts, etc. at 14,880 pps per port at 100% of wire-speed for 10Mbps
speed.
♦Data filtering rate eliminates all error packets, runts, etc. at 148,800 pps per port at 100% of wire-speed for
100Mbps speed.
♦12K active MAC address entry table per device with automatic learning and aging (10 to 1000000 seconds).
♦12 MB packet buffer per device.
♦Broadcast storm filtering.
♦IGMP Multicast support.
♦802.1Q VLANs.
♦GARP/GVRP, GARP/GMRP support.
♦DHCP Client.
♦802.1p Priority Queues.
Management
♦RS-232 console port for out-of-band network management via a console terminal or PC.
♦Spanning Tree Algorithm Protocol for creation of alternative backup paths and prevention of network loops.
♦Fully configurable either in-band or out-of-band control via SNMP-based software.
♦Flash memory for software upgrades. This can be done in-band via TFTP.
♦Built-in SNMP management: Bridge MIB (RFC 1493), RMON MIB (RFC 1757), MIB-II (RFC 1213), Entity MIB
version 2 (RFC 2737), and Proprietary MIBs.

24-port NWay Ethernet Switch User’s Guide
4Unpacking and Setup
2
UNPACKING AND SETUP
This chapter provides unpacking and setup information for the Switch.
Unpacking
Open the shipping carton of the Switch and carefully unpack its contents. The carton should contain the following items:
♦One DES-3225G 24-port NWay Ethernet Switch
♦One 2-port 100BASE-TX Fast Ethernet module preinstalled on front panel (DES-3225GF includes a 1-port
100BASE-FX module preinstalled).
♦One console cable
♦Mounting kit: 2 mounting brackets and screws
♦Four rubber feet with adhesive backing
♦One AC power cord
♦This User’s Guide with Registration Card
If any item is found missing or damaged, please contact your local D-Link reseller for replacement.
Installation
Use the following guidelines when choosing a place to install the Switch:
♦The surface must support at least 3 kg.
♦The power outlet should be within 1.82 meters (6 feet) of the device.
♦Visually inspect the power cord and see that it is secured to the AC power connector.
♦Make sure that there is proper heat dissipation from and adequate ventilation around the switch. Do not place
heavy objects on the switch.
Desktop or Shelf Installation
When installing the Switch on a desktop or shelf, the rubber feet included with the device should first be attached. Attach
these cushioning feet on the bottom at each corner of the device. Allow adequate space for ventilation between the device
and the objects around it.

24-port NWay Ethernet Switch User’s Guide
Unpacking and Setup 5
Figure 2-1. Installing rubber feet for desktop installation
Rack Installation
The DES-3225G can be mounted in an EIA standard-sized, 19-inch rack, which can be placed in a wiring closet with other
equipment. To install, attach the mounting brackets on the switch’s side panels (one on each side) and secure them with
the screws provided.
Figure 2- 2A. Attaching the mounting brackets to the switch
Then, use the screws provided with the equipment rack to mount the switch on the rack.
Figure 2-2B. Installing the switch on an equipment rack

24-port NWay Ethernet Switch User’s Guide
6Unpacking and Setup
Power on
The DES-3225G switch can be used with AC power supply 100 - 240 VAC, 50/60 Hz. The Switch’s power supply will adjust
to the local power source automatically and may be used without having any or all LAN segment cables connected.
After the switch is plugged in, the LED indicators should respond as follows:
♦All LED indicators will momentarily blink. This blinking of the LED indicators represents a reset of the system.
♦The power LED indicator will blink while the Switch loads onboard software and performs a self-test. After
approximately 20 seconds, the LED will light again to indicate the switch is in a ready state.
♦The console LED indicator will remain ON if there is a connection at the RS-232 port, otherwise this LED indicator
is OFF.
♦The 100M LED indicator may remain ON or OFF depending on the transmission speed.
Power Failure
As a precaution, in the event of a power failure, unplug the switch. When power is resumed, plug the switch back in.

24-port NWay Ethernet Switch User’s Guide
Identifying External Components 7
3
IDENTIFYING EXTERNAL COMPONENTS
This chapter describes the front panel, rear panel, optional plug-in modules, and LED indicators of the DES-3225G.
Front Panel
The frontpanel of the Switch consists of LED indicators, an RS-232 communication port, a slide-in module slot, two uplink
ports, and 22 (10/100 Mbps) Ethernet/Fast Ethernet ports.
Figure 3-1. Front panel view of the Switch
♦Comprehensive LED indicators display the status of the switch and the network. A description of these LED
indicators follows (see the LED Indicators section below).
♦An RS-232 DCE console port for setting up and managing the switch via a connection to a console terminal or PC
using a terminal emulation program.
♦A front-panel slide-in module slot for 10/100 Mbps Ethernet ports can accommodate a 2-port 10/100BASE-TX Fast
Ethernet module, a 2-port 100BASE-FX MT-RJ type module, or a 1-port 100BASE-FX SC type module.
♦Two MDI-II Uplink jacks which can be used to connect a straight-through cable to a normal (non-Uplink) port on a
switch or hub. Do not use port 1X if the top Uplink port is occupied or Port 2X if the bottom Uplink port is occupied.
♦Twenty-two high-performance, NWay Ethernet ports all of which operate at 10/100 Mbps for connections to end
stations, servers and hubs. All ports can auto-negotiate between 10Mbps or 100Mbps, full- or half-duplex, and flow
control.
Rear Panel
The rear panel of the switch consists of a slot for an optional Gigabit Ethernet fiber port and an AC power connector. The
following displays the rear panel of the switch.
Figure 3-2. Rear panel view of the Switch

24-port NWay Ethernet Switch User’s Guide
8Identifying External Components
Figure 3-3. Rear panel view of the Switch fitted with the optional Gigabit Ethernet slide-in module
♦The optional Gigabit Ethernet slide-in module (1000BASE-SX, 1000BASE-LX, or 1000BASE-T) contains one port
for connecting to another switch.
♦The AC power connector is a standard three-pronged connector that supports the power cord. Plug-in the female
connector of the provided power cord into this socket, and the male side of the cord into a power outlet. Supported
input voltages range from 100 ~ 240 VAC at 50 ~ 60 Hz.
Side Panels
The right side panel of the Switch contains two system fans (see the top part of the diagram below). The left side panel
contains heat vents.
Figure 3-4. Side panel views of the Switch
♦The system fans are used to dissipate heat. The sides of the system also provide heat vents to serve the same
purpose. Do not block these openings, and leave at least 6 inches of space at the rear and sides of the switch for
proper ventilation. Be reminded that without proper heat dissipation and air circulation, system components might
overheat, which could lead to system failure.
Optional Plug-in Modules
The DES-3225G 24-port NWay Ethernet Switch is able to accommodate a range of plug-in modules in order to increase
functionality and performance.

24-port NWay Ethernet Switch User’s Guide
Identifying External Components 9
100BASE-TX Module
Figure 3-5. Two-port, 100BASE-TX module
♦Two-port, front-panel module.
♦Connects to 100BASE-TX devices at full- or half-duplex.
♦Supports Category 5 UTP or STP cable connections of up to 100 meters.
100BASE-FX (SC) Fiber Module
Figure 3-6. One-port, 100BASE-FX (SC) module
♦One-port, front-panel module.
♦Connects to 100BASE-FX devices at full- or half-duplex.
♦Supports multi-mode fiber-optic cable connections of up to 412 meters in half-duplex or 2 km in full-duplex mode.
100BASE-FX (MT-RJ) Fiber Module
Figure 3-7. Two-port, 100BASE-FX (MT-RJ) module

24-port NWay Ethernet Switch User’s Guide
10 Identifying External Components
♦Two-port, front-panel module.
♦Connects to 100BASE-FX devices at full- or half-duplex.
♦Supports multi-mode fiber-optic cable connections of up to 412 meters in half duplex or 2 km in full duplex mode.
1000BASE-SX Gigabit Module
Figure 3-8. One-port, 1000BASE-SX module
♦One-port, rear-panel module.
♦Connects to 1000BASE-SX devices at full duplex or auto (auto negotiation is available in DES-3251G, version A3 and
later).
♦Allows connections using multi-mode fiber optic cable in the following configurations:
62.5µµm62.5µµm50µµm50µµm
Modal bandwidth
(min. overfilled launch)
Unit: MHz*km
160 200 400 500
Operating distance
Unit: meters
220 275 500 550
Channel insertion loss
Unit: dB
2.33 2.53 3.25 3.43
1000BASE-LX Gigabit Module
Figure 3-9. One-port, 1000BASE-LX module
♦One-port, rear-panel module.
♦Connects to 1000BASE-LX devices at full duplex or auto (auto negotiation is available in DES-3251GL, version A3 and
later).