GS748T Smart Switch
Hardware Installation
Guide
NETGEAR, Inc.
4500 Great America Parkway
Santa Clara, CA 95054 USA
202-10232-01
January 2007
© 2007 by Netgear Inc. All Rights reserved
Trademarks
NETGEAR, Netgear Inc., the NETGEAR logo, Auto Uplink, ProSafe, and Everybody’s connecting are trademarks or
registered trademarks of Netgear, Inc. in the United States and/or other countries.
are registered trademarks of Microsoft Corp orat ion.
holders. Information is subject to change without notice. All rights reserved.
Other brand and product names are trademarks of their respective
Microsoft, Windows, and Windows NT
Statement of Conditions
In the interest of improving internal design, operational function, and/or reliability, NETGEAR reserves the right to
make changes to the products described in this document without notice.
NETGEAR does not assume any liability that may occur due to the use or appli cation of the product(s) or circuit
layout(s) described herein.
Certificate of the Manufacturer/Importer
It is hereby certified that the GS748T Gigabit Smart Switch has been suppressed in accordance with the conditions set
out in the BMPT-AmtsblVfg 243/1991 and Vfg 46/1992. The operation of some equipment (for example, test
transmitters) in accordance with the regulations may, however , be subject to certain restrictions. Please refer to the notes
in the operating instructions.
The Federal Office for Telecommunications Approvals has been notified of the placing of this equipmen t on the market
has been granted the right to test the series for compliance with the regulation s.
and
Voluntary Control Counci l for Interference (VCCI) Statement
This equipment is in the first category (information equipm ent to be used in commercial and/or indu strial areas) and
conforms to the standards set by the Voluntary Control Council for Interference by Data Processing Equipment and
Electronic Office Machines that are aimed at prev enting radio interference in commercial and/ or industrial areas.
Consequently, when this equipment is used in a residential area or in an adjacent area thereto, radio interference may be
caused to equipment such as radios and TV receivers.
Federal Communications Commission (FCC) Compliance Noti ce: Radio Fr equency
Notice
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
This device may not cause harmful interference.
This device must accept any i nt erference received, including interference that may cause undesired operation.
NOTE: This equipment has b een tested and found to comply with the lim it s for a Class A digital d e vice, pursuant to
part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses, and can radiate radio frequency
energy and, if not instal led and used in accordance with the instructions, may cause harmful interf ere n ce to
radio communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equip ment of f and on, the user is encou raged to try to corre ct the interference by one
or more of the following measures:
• Reorient or relocate the receiving an t enna.
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• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
EN 55 022 Declaration of Conformance
This is to certify that the NETGEAR GS748T Gigabit Smart Switch is shielded against the generation of radio
interference in accordance with the application of Council Directive 89/336/EEC, Article 4a. Conformity is de
clared by the application of EN 55024 Class A (CISPR 22).
EN 55 022 and EN 55 024 Statements
This is to certify that the NETGEAR GS748T Gigabit Smart Switch is shielded against the generation of radio interference
in accordance with the application of Council Directive 89/336/EEC, Article 4a. Conformity is declared by the application of
EN 55 022 Class A (CISPR 22) and EN 55 024.
-
Note: Warning: This is a Class A product . In a domes tic enviro nment, t his pr oduct may
cause radio interference, in which case the user may be required to take
appropriate measures.
Canadian Department of Communications Radio Interference Regulations
This digital apparatus (NETGEAR GS748T Gigabit Smart Switch) does not exceed the Class A limits for radio-noise
emissions from digital apparatus as set out in the Radio Interference Regulations of the Canadian Department of
Communications.
Règlement sur le brouillage radioélectriqu e du ministère des Communications
Cet appareil numérique (NETGEAR GS74 8T Gigabit Smart S witch) respecte les li mites de bruits rad ioélectriques vi sant
les appareils numériques de classe A prescrites dans le Règlement sur le brouil la ge radioélectrique du ministère des
Communications du Canada.
Customer Support
For assistance with installing and configuring your NETGEAR system or for questions or problems following
installation:
• Check the NETGEAR Web page at htt p:// www.NETGEAR.com/support
• Call T e chnic a l Support in No rth Am erica at 1-88 8-NE TGEAR. If yo u are outsid e North Amer ica , plea se
refer to the phone numbers listed on the Suppo rt Information Card that was included with your switch.
• Email Technical Support at support@NETGEAR.com.
• Defective or damaged merchandise can be returned to your point-of-purchase re presentative.
Internet/World Wide Web
NETGEAR maintains a World Wide Web home page that you can access at the uniform resource locator (URL) htt p: / /
www.NETGEAR.com. A direct connection to the Internet and a Web browser such as Internet Explorer or Netscape are
required.
FCC Requirements for Operation in the United S tates
FCC Information to User This product does not contain any user-serviceable components and is to be
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iii
used with approved antennas only. Any product changes or modifications will invalidate all applicable regulatory certifications and approv al s
FCC Guidelines for Human Exposure This equipm en t co mplies with FCC radiat ion ex pos ure lim its set
forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20 cm between the radiator and your body. This transmitter must not be co-located or operating in
conjunction with any other ante nna or transm itte r.
FCC Declaration Of Conformity We, NETGEAR, Inc., 4500 Great America Parkway, Santa Clara, CA
95054, declare under our sole responsibility that the model FS728TP: ProSafe™ 24 Port 10/100 Smart
Switch with 4 Gigabit Ports and 24 Port PoE complies with Part 15 of FCC Rules. Operation is subject to the
following two conditions: a) This device may not cause harmful interference and b) This device must accept
any interference received, including interference that may cause undesired operation."
Product and Publication Details
Model Number: GS748T
Publication Date: January 2007
Product Family: Smart Switch
Product Name: GS748T Gigabit Smart Switch
Home or Business Product: Business
Language: English
Publication Part Number: 202-10232-01
Publication Version Number: 1.0
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Contents
About This Manual
Chapter 1
Introduction
Overview ............................ ...... ............. ............. ............. ............. ............. ............. .........1-2
Features .........................................................................................................................1-3
Package Contents ..........................................................................................................1-5
Chapter 2
Physical Description
Front and Back Panels .............................................................................................2-1
10/100/1000 Mbps RJ-45 Ports ...............................................................................2-2
SFP GBIC Module ....................................................................................................2-2
LED Descriptions ............................................................................................................2-2
Reset Button ............................................................................................................2-3
Restore Factory Defaults Button ..............................................................................2-4
Chapter 3
Applications
Desktop Switching ....................................................................................................3-1
Backbone Switching .................................................................................................3-2
Chapter 4
Installation
Step 2: Installing the Switch ............................................................................................4-2
Installing the Switch on a Flat Surface .....................................................................4-2
Installing the Switch in a Rack .................................................................................4-2
Step 3: Checking the Installation ....................................................................................4-3
Step 4: Connecting Devices to the Switch ......................................................................4-3
Step 5: Installing a SFP GBIC Module ............................................................................4-4
Step 6: Applying AC Power ............................................................................................4-5
Step 7: Management through a Web Browser or Utility Program (Initial Configuration) .4-6
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Appendix A
Troubleshooting
Troubleshooting Chart ............................................................................................. A-1
Additional Troubleshooting Suggestions ....................................................................... A-2
Network Adapter Cards ........................................................................................... A-2
Configuration ............... ................................ ................................ .......................... .. A-2
Switch Integrity ........................................................................................................ A-2
Appendix B
Technical Specifications
Appendix C
Glossary
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About This Manual
The NETGEAR® GS748T Smart Switch™ Hardware Installation Guide describes how to install,
configure, and troubleshoot the GS748T Gigabit Smart Switch. The information in this manual is
intended for readers with intermediate computer and Internet skills.
Conventions, Fo rm ats, and Sc op e
The conventions, formats, and scope of this manual are described in the following paragraphs:
• Typographical Conventions. This manual uses the following typographical conventions:
Italics Emphasis, books, CDs, URL names
Bold User input
Fixed Screen text, file and server names, extensions, commands, IP addresses
• Formats. This manual uses the following formats to highlight special messages:
Note: This format is used to highlight information of importance or special interest.
Tip: This format is used to highlight a procedure that will save time or resources.
Warning: This is a warning of possible malfunction or damage to the equipment.
Danger: This is a safety warning. Failure to take heed of this notice may result in
personal injury or death.
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GS748T Smart Switch Hardware Installation Guide
• Scope. This manual is written for the GS748T Smart Switch according to these specifications:
Product Version GS748T Gigabit Smart Switch
Manual Publication Date January 2007
.
Note: Product updates are available on the NETGEAR, Inc. website at
http://kbserver.netgear.com/products/GS748T.asp.
How to Use This Manual
The HTML version of this manual includes the following:
• Buttons and for browsing forwards or backwards through the manual one page
at a time.
•A button that displays the table of conte nts and a button. Double-click on a link
in the table of contents or index to navigate directly to where the topic is described in the
manual.
•A button to access the full NETGEAR, Inc. online knowledge base for the product
model.
• Links to PDF versions of the full manual and individual chapters.
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GS748T Smart Switch Hardware Installation Guide
How to Print this Manual
To print this manual, choose one of the following options:
• Printing a Page from HTML. Each page in the HTML version of the manual is dedicated to
a major topic. Select File > Print from the browser menu to print the page contents.
• Printing from PDF. Your computer must have the free Adobe Acrobat reader installed in
order to view and print PDF files. The Acrobat reader is available on the Adobe Web site at
http://www.adobe.com.
– Printing a PDF Chapter.
• Click the PDF of This Chapter link at the top lef t of any pag e in t he cha pt er you want
to print. The PDF version of the chapter you were viewing opens in a browser
window.
• Click the print icon in the upper left of your browser window.
– Printing a PDF version of the Complete Manual.
•Click the Complete PDF Manual link at the top left of any page in the manual. The
PDF version of the complete manual opens in a browser window.
• Click the print icon in the upper left of your browser window.
Tip: If your printer supports printing two pages on a single sheet of paper, you can
save paper and printer ink by selecting this feature.
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GS748T Smart Switch Hardware Installation Guide
Revision History
Document Part
Number
202-10232-01 1.0 Document created
Version
Number
Description
x
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Chapter 1
Introduction
Congratulations on your purchase of the NETGEAR GS748T Gigabit Smart Switch! Your
NETGEAR Switch is a state-of-the-art, high-performance, IEEE-compliant network solution
designed for users who requir e a lar ge number of po rts and want the power of Gigabit conne ctivity
to eliminate bott lenecks, boos t performance , and increase productivit y . Th ere are 48 twi sted-paired
ports with 4 SFP GBIC slots on the front pane l of t he swi tc h which suppo rt non-s to p 10/100/1000
networks. To simplify installation, the switch is shipped ready for use out of the box.
This chapter provides the following information:
•Overview
•Switch Features
• Package contents
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GS748T Smart Switch Hardware Installation Guide
Overview
Your NETGEAR GS748T Gigabit Smart Switch provides 48 twisted-pair ports with four built-in
Small Form Factor (SFP) GBIC slots that support nonstop 10/100/1000M fiber networks. Using
these Gigabit slots, you can create high-speed connections to a server or network backbone. For
example, you can:
• Connect switches to each other with high-speed links
• Link to high-speed servers
• Provide 10/100/1000 copper and fiber connectivity
Your GS748T Gigabit Smart Switch also provides the benefit of administrative management with
a complete package of features for the observation, configuration, and control of your network.
With a Web-based Graphical User Interface (GUI), the switch’s many capabilities can be viewed
and used in a simple and intuitive manner. There is also an easy to use switch management utility
that runs on a PC. The switch’s management features include configuration for port and switch
information, VLAN for tra ffi c control , port tr unking for increas ed bandwid th, and Cla ss of Ser vice
(CoS) for traffic prioritization. These features, and more, enable you better to understand and
control your network.
Your NETGEAR GS748T Gigabit Smart Switch ca n be free-standing or r ack -moun ted in a wiring
closet or equipment roo m. It is IEEE-c ompliant and of fers low latenc y for high- speed networki ng.
It includes 48 auto-sensing 10/100/1000 Ethernet ports with 4 SFP GBIC slots. All ports can
automatically negotiate to the highest speed. Th is capability makes the sw itch ideal for
environments that have a mix of Et hernet, Fa st Ethern et, and Giga bit Ether net device s. In addit ion,
all 10/100/1000 Mbps ports operate in half- or full-duplex mode, increasing the maximum
bandwidth of each connection to either 20 Mbps, 200 Mbps, or 2000 Mbps, respectively. The
maximum segment length is 328 feet (100 meters) over Category 5 unshielded twisted-pair (UTP)
cable.
1-2 Introduction
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GS748T Smart Switch Hardware Installation Guide
Features
The following list identifies the key features of the NETGEAR GS748T Gigabit Smart Switch.
• Forty-eight 10/100/1000 Mbps auto-sensing Gigabit-Ethernet switching ports
• Four SFP GBIC combo Gigabit Ethernet slots for optional fiber connectivity
•Reset Button
• Factory Defaults Button
• Administrative switch management
• IEEE 802.1Q Tag VLAN with up to 48 VIDs ranging in 2 to 4K
• IEEE 802.1p QoS support, two priority queues per port
• Port-based VLAN with up to 48 groups; any one port can belong to different VLAN
groups
• IEEE 802.3ad Link Aggregation support
• Embedded HTTP server for Web-based management
• Supports port-setting function, enabling user to enable/disable each port, and set speed,
duplex mode and device flow control
• Auto-Discovery su pport with applicat ion progra m for discovering and managing the smar t
switches on the network
• Flash upgrade, configuration backup/restore, and factory reset
• Full compatibility with IEEE standards:
• IEEE 802.3i (10BASE-T)
• IEEE 802.3u (100BASE-TX)
• IEEE 802.3z/ab (1000BASE-X, 1000Base-T)
• IEEE 802.3x (full-duplex flow control)
• Auto-sense and auto-negotiate for all ports
• Auto Uplink on all ports for the right connection sense
• Integrated address Look-Up Engine supports 8K absolute MAC addresses
• Full- and half-duplex functions for all 10/100/1000 ports
• Store-and-Forward transmission to remove bad packets from the network
• Active flow control to minimize packet loss/frame drops:
• Half-duplex back-pressure control
Introduction 1-3
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GS748T Smart Switch Hardware Installation Guide
• Full-duplex IEEE 802.3x pause frame flow control
• LED indicators for port status monitoring:
• Power LED indicates power on/off status
• Link/Act LED indicates link status and activity
• SFP GBIC Link/Act LED indicates link status and activity
• Flexible installation:
• Standalone desktop installation
• 19-inch standard rack-mount
• Standard 1U case size
1-4 Introduction
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GS748T Smart Switch Hardware Installation Guide
Package Contents
Figure 1-1 shows the package contents of the NETGEAR GS748T Gigabit Smart Switch.
Figure 1-1 Package Contents
Verify that your package contains the following:
• GS748T Gigabit Sm art Switch
• Rubber footpads for tabletop installation
• Power cord
• 19-inch rack-mount kit
• Installation guide
• Smart Switch Resource CD with Smart Wizard Discovery Utility, and Hardware and User’s
manuals
• Warranty/Support Information Card
If any item is missing or damaged, contact your point-of-purchase representative immedi-
ately.
Introduction 1-5
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1-6 Introduction
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Chapter 2
Physical Description
This chapter describes the hardware features of the NETGEAR GS748T Gigabit Smart Switch.
Topics include:
• Front and back panels
• 10/100/1000 Mbps auto-sensing RJ-45 ports
• SFP GBIC Module bay
• LED descriptions
• Reset button
• Factory defaults button
Front and Back Panels
Figure 2-1 and Figure 2-2 show the key components on the front and back panels of the
NETGEAR GS748T Gigabit Smart Switch.
Figure 2-1 GS748T Gigabit Smart Switch—Front Panel
Figure 2-2 GS748T Gigabit Smart Switch—Rear Panel
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GS748T Smart Switch Hardware Installation Guide
The front panel contains RJ-45 jac ks with LEDs and 4 SFP GBIC module bays. The rear panel has
a standard AC power receptacle for accommodating the supplied power cord.
10/100/1000 Mbps RJ-45 Ports
The 48 10/100/1000 Mbps, auto-sensing RJ-45 ports of the GS748T Gigabit Smart Switch are
seen in
determines the maximum speed (10 or 100 or 1000 Mbps) and the mode (half- or full-duplex) of
the attached device. All ports support only unshielded twisted-pair (UTP) cable with an 8-pin RJ45 plug connection.
To simplify the procedure for attaching devices, all RJ-45 ports support Auto Uplink. This
technology enables you to attach devices to the RJ-45 ports using either straight-through or
crossover cables. When you insert a cable into one of these ports, the switch automatically:
• Detects whether the combination of attached device and network cable (normal or crossover)
• Configures the RJ-45 port to enable communications with the attached device without user
Figure 2-1. When you insert a cable into one of these ports, the switch automatically
requires a normal connection (such as when connecting the port to a PC) or an uplink
connection (such as when connecting the port to a router, switch, or hub).
intervention.
SFP GBIC Module
To enable you to have fiber connections on your network, there are four module bays which
accommodate standard SFP GBIC modules, such as the AGM731F or AGM732F from
NETGEAR. The module bays use combo ports which comprise respective shared connections
with the last four RJ-45 ports, na mely port 45T, 46T, 47T, and 48T . Only one type of conne ction of
a combo port can be active at any time. For example, both port 45T and 45F cannot be used
simultaneously. If both connectors of a combo port are made together, the fiber port (45F) is
active.
The SFP GBIC bay accommodates a standard SFP GBIC module. This module has an LC
connector that is compatible with the IEEE 802.3Z 1000 Base-SX Standard.
LED Descriptions
The front panel of the NETGEAR GS748T Gigabit Smart Switch comprises LEDs that provide a
concise display of link, port speed, and activity. The following table summarizes the function of
these LEDs.
2-2 Physical Description
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GS748T Smart Switch Hardware Installation Guide
Table 2-1. Front Panel LEDs
Label Color Activity Description
Power Green
Green
Speed/Link/ACT
SFP (MiniGBIC) Link/Act Green
Yellow On A valid 10/100Mbp s lin k is established
None Off No 10/100/1000Mbps link is
On Power is supplied to the switch
Off Power is disconnected
On A valid 1000Mbp s link is e stablished on
the port
Blinking Data transmis sion is occurring at
1000Mbps on the port
on the port
established on the port
On A valid 1000Mbp s link is e stablished on
the port
Off No valid link is established on the port
Reset Button
The Reset button of the GS748T triggers a hardware reset of the switch. Figure 2-3 shows its
location on the front panel. This action is equivalent to switching the unit power off and back on.
The last saved confi guration is loaded i nto the swit ch as it r esets. To operate the reset button , inser t
a device such as a paper clip into the opening to press the recessed button. The front-panel LEDs
should extinguish and light again as the switch performs its Power On Self Test (POST).
Physical Description 2-3
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Figure 2-3 Reset Button of the GS748T Gigabit Smart Switch
Restore Factory Defaults Button
The Restore Factory Default button of the GS748T Smart Switch enables you to clear the current
settings and return the switch to its factory default configuration. This function clears all settings,
including the password, VLAN sett in gs, an d port configurations. To perform this operation, insert
a device such as a paper clip into the opening to press the recessed button.
2-4 Physical Description
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Figure 2-4 Restore Factory Defaults Button of the GS748T Gigabit Smart Switch
Physical Description 2-5
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GS748T Smart Switch Hardware Installation Guide
2-6 Physical Description
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Chapter 3
Applications
Your NETGEAR GS748T Gigabit Smart Switch is designed to provide flexibility in configuring
your network connections. It can be used as your only network traffic-distribution device or with
added 10 Mbps, 100 Mbps, 10/100 Mbps, and 1000 Mbps hubs and switches. This chapter shows
how the switch can be used in various network environments.
Topics include:
• Desktop switching
• Backbone switching
Desktop Switching
Your NETGEAR GS748T Gigabit Smart Switch can be used as a desktop switch in a small
network that gives users 1000 Mbps access to a file server. With full-duplex mode enabled, the
switch port connected to the server or PC can provide 2000 Mbps throughput.
Figure 3-1 Example of Desktop Switching
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GS748T Smart Switch Hardware Installation Guide
Backbone Switching
You can use your GS748T Gigabit Smart Switch as a backbone switch in a small network that
gives users high-speed access to servers and other network devices.
Figure 3-2 Example of Backbone Switching
3-2 Applications
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Chapter 4
Installation
This chapter describes the installation procedures for your NETGEAR GS748T Gigabit Smart
Switch. Switch installation involves the following steps:
1. Preparing the site
2. Installing the switch
3. Checking the installation
4. Connecting devices to the switch
5. Installing an SFP GBIC module
6. Applying AC power
7. Switching management through a We b Browser or Utility Program (initial configuration)
Step 1: Prepar ing the Site
Before you install your switch, ensure that your operating environment meets the environmental
requirements in
Table 4-1.
Table 4-1. Site Requirements
Characteristics Requirements
Mounting
Installations Desktop: provide a flat table or shelf surface
Rack-mount: use a 19-inch (48.3-centimeter) EIA standard equipment rack
that is grounded and physically secure. You also need the rack-mount kit
supplied with your switch.
Access Locate the switch in a position that lets you access the front panel RJ-45
ports, view the front panel LEDs, and access power connector.
Power source Provide a power sourcea within 6 feet (1.8 meters) of the inst alla tion loc ation .
Ensure that the AC outlet is not controlled by a wall switch, which can
accidentally turn off power to the outlet and the switch.
Environmental
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GS748T Smart Switch Hardware Installation Guide
Table 4-1. Site Requirements (continued)
Temperature: Install the swi tch in a d ry area , with ambi ent temper ature in the range 0–55ºC
(32–131ºF). Keep the swit ch awa y fr om he at sou rces such as di rect s unlig ht,
warm air exhausts, hot-air vents, and heaters.
Operating humidity: The installation location should have a maximum relative humidity of 90%,
non-condensing.
Ventilation: Do not restrict airflow by covering or obstructing air inlets on the sides of the
switch. Keep at least 2 inche s (5. 08 c enti me ters ) free on all sides for cooling.
Be sure there is adequate airflow in the room or wiring closet where you
intend to install the switch.
Operating conditions: Keep the switch at least 6 ft. (1.83 m) away from any source of
electromagnetic noise, for example, a photocopy machine.
a. Power specifications for the switch are shown in Appendix B, “Technical Specifications”
Step 2: Installing the Switch
Install the s witch using one of the following methods:
Installing the Switch on a Flat Surface
The switch ships with four self-adhesive rubber footpads. Attach one rubber foot pad into each of
the four concave depressions on the base of the switch.
Note: These footpads cushion the switch against shock and vibration. They also provide
for ventilation space between stacked switches.
Installing the Switch in a Rack
To install the switch in a rack, us e the 19- inch rack-mount kit (su ppl ied with your switch) wi th the
following procedure (refer to
1. Attach the supplied mounting brackets to the side of the switch using the screws provided in
the rack-mount kit.
2. Tighten the screws with a #1 Phillips screwdriver to secure each bracket.
3. Orient the switch to align the unused mounting holes in the brackets with appropriate holes in
the rack.
4-2 Installation
Figure 4-1, “ Mounting the Switch in a Rack”):
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GS748T Smart Switch Hardware Installation Guide
4. Support the weight of t he switch and use four pan-head screws with nylon washe rs to att ach it
to the rack; use a #2 Phillips screwdriver to tighten the screws.
Figure 4-1 Mounting the Switch in a Rack
Step 3: Checking the Installation
Before you apply power, inspect the equipment thoroughly to:
• Verify that all cab les are installed correctly.
• Check that cables are not damaged and that c abl e r out ing does not interfere wit h e qui pment t o
create a safety hazard.
• Ensure that all equipment is mounted properly and securely.
Step 4: Conne cting Devices to the Switc h
The following procedure describes how to connect devices to the switch’s RJ-45 ports. Your
NETGEAR GS748T Gigabit Smart Switch contains Auto Uplink technology, which enables you
to attach devices using either straight-through or crossover cables.
Installation 4-3
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GS748T Smart Switch Hardware Installation Guide
Figure 4-2 Connecting Devices to the Switch
Connect each device to an RJ-45 netw ork port on the sw it ch’s front panel (see Figure 4-2) using a
Category 5 (Cat5) unshielded twisted-pair (UTP) cable with RJ-45 connectors.
Note: Ethernet specifications limit the cable length between the switch and the attached
device to 100 m (328 ft.).
Step 5: Inst a lling a SFP GBIC Module
The following procedure describes how to install an optional SFP GBIC module into one of the
SFP GBIC module bays of the switch.
Note: Contact your NETGEAR sales office to buy these modules. If you do not want to
install a SFP GBIC module, skip this procedure.
T o inst all a SFP GBI C module, ins ert the SFP modul e into t he SFP GBIC module bay. Press firmly
on the flange of the module to seat it securely into the connector.
You can install up to three additional Gigabit Ethernet modules using this procedure.
4-4 Installation
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Figure 4-3 Installing a SFP GBIC Module into GS748T
Step 6: Applying AC Power
Because he NETGEAR GS748T Gigabit Smart Swi tch has no ON/OFF switc h, AC power must be
controlled by means of the IEC power cord connection. Select an appropriate unswitched,
grounded AC facility outlet so as to avoid any future inadvertent power interruptions. Use the
following procedure to apply AC power:
1. Connect the female end of the supplied IEC AC power adapter cable to the power receptacle
on the back of the switch.
2. Connect the 3-pronged end of the AC power adapter cable to the AC outlet.
When you apply power, the green Power LED on the switch front panel illuminates.
.
Note: If the Power LED does not light, check that the power cable is installed correctly
and that the AC power su ppl y is present. If this does not resolve the proble m, re fer
to
Appendix A, “Troubleshoo ting”.
Installation 4-5
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GS748T Smart Switch Hardware Installation Guide
Step 7: Management through a Web Browser or Utilit y Program (Initial Configura tion)
Y o ur NETGEAR GS748T Gigabit Smart Swit ch has embedded manage ment software for viewi ng,
changing, and monitoring its activity and configuration. You need not use this management
software for it to function as a simple switch. However, the management software enables you to
set up advanced features such as VLANs and Trunking and also enables you to configure the
switch for improved efficiency and performance. As a result, you can improve the overall
performance of your network.
After you power-up the switch for the first time, you can configure it using a Web browser or a
utility program called Smartwizard Discovery. For more information about managing the switch,
see the User Manual on the Smart Switch Resource CD.
4-6 Installation
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Appendix A
Troubleshooting
This chapter provides information about troubleshooting the NETGEAR GS748T Gigabit Smart
Switch. Information is supplied as:
• A Troubleshooting chart
• Additional troubleshooting suggestions
Troubleshooting Chart
Table A-1 lists symptoms, causes, and solutions of possible problems.
Table A-1. Troubleshooting Chart
Symptom Cause Solution
Power LED is off No power is received Check the power cord connections for the switch at
the switch and the connected device
Make sure all cables used are correct and comply
with Ethernet specifications.
Link/ACT LED is off Port connection is not
working
Check the crimp on the connectors and make sure
that the plug is properly inserted and locked into the
port at both the switch and the connecting device.
Make sure all cables used are correct and comply
with Ethernet specifications. See Appendix D.
Check for a defective adapter card, cable, or port by
testing them in an alternate envir onment wher e all
products are functioning.
File transfer is slow or
performance
degradation is a
problem
Troubleshooting A-1
Half- or full-duplex
setting on the switch
and the connected
device are not the same
v1.0, January 2007
Make sure the attached device is set to auto
negotiate.
GS748T Smart Switch Hardware Installation Guide
Table A-1. Troubleshooting Chart (continued)
Symptom Cause Solution
A segment or device is
not recognized as part of
the network
Link/ACT LED is
flashing continuous ly on
all connected ports and
the network is disabled
One or more devices
are not properly
connected, or cabling
does not meet Ethernet
guidelines
A network loop
(redundant path) has
been created
Verify that the cabling is correct. Be sure all
connectors are securely positioned in the required
ports. Equipment may have been accidentally
disconnected
Break the loop by ensuring that there is only o ne path
from any networked device to any other networked
device
Additional Troubleshooting Suggestions
If the suggestions in Table A-1 do not resolve your problem, refer to the troubleshooting
suggestions in this section.
Network Adapter Cards
Ensure that the network adapt er cards installed in the PCs are in worki ng condition and their most
recent software drivers have been installed.
Configuration
If problems occur after altering the network configuration, restore the original connections and
attempt to isolate the pro blem by implementing the most-re cen t changes, one step at a time. Make
sure that cable distances, repeater limits, and other physical aspects of the installation do not
exceed the Ethernet specification limitations.
Switch Integrity
If required, verify the integrity of the switch by resetting it. To do this, use the Tools> Reset
command or remove AC power from the switch and then reapply it. If the problem persists,
contact NETGEAR technical suppor t. In North America, ca ll 1-888-NETGEAR. If you ar e outside
of North America, please refer to the support information card included with your product.
A-2 Troubleshooting
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Appendix B
Technical Specificatio ns
This appendix provides technical specifications for the NETGEAR GS748T Gigabit Smart
Switch.
Network Protocol and St andards Compatibility
IEEE 802.3 10BASE-T
IEEE 802.3u 100BASE-TX
IEEE 802.3ab 1000BASE-T
IEEE 802.3z 1000Base-X
IEEE 802.3x flow control
Management
IEEE 802.1Q Static VLAN (Up to 256)
Port-based VLAN (Up to 48)
IEEE 802.1p Class of Service (CoS)
Port-based QoS (Port default priority; options: High/Normal/Low/Lowest)
Port Trunking - Manual as per IEEE802.3ad Link Aggregation
Port Monitoring
Interface
48 RJ-45 connectors for 10BASE-T, 100BASE-TX, and 1000BASE-T (Auto Uplink‘ on all ports)
with 4 SFP GBIC module bays that share with 4 RJ-45 ports for fiber connectivity
LEDs
Per port (Gigabit): Speed/Link/Act
Per device: Power
Technical Specifications B-1
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GS748T Smart Switch Hardware Installation Guide
Performance Specifications
Forwarding modes: Store-and-forward
Bandwidth: 96 Gbps
Network latency: Less than 20 microseconds for 64-byte frames in store-and-forward mode for
100 Mbps to 100 Mbps transmission
Buffer memory: 512 KB embedded memory per unit
Address database size: 8,000 media access control (MAC) addresses per system
Mean Time Between Failure (MTBF): 108,016 hours (~12 years)
Power Supply
Power Consumption: 90 W maximum
100–240VAC/50–60 Hz universal input
Physical Specifications
Dimensions (H x W x D): 1.7 x 17.3 x 12.2 in (43.2 x 440 x 305 mm)
Weight: 10.89 lb. (4.95 kg)
Environmental Specifications
Operating temperature: 0 to 55°C (32 to 131°F)
Storage temperature: -20 to 70°C (28 to 158°F)
Operating humidity: 90% maximum relative humidity, non-condensing
Storage humidity: 95% maximum relative humidity, non-condensing
Operating altitude: 3,000 m (10,000 ft.) maximum
Storage altitude: 3,000 m (10,000 ft.) maximum
Electromagnetic Emissions
CE mark, commercial
FCC Part 15 Class A
VCCI Class A
C-Tick
B-2 Technical Specifications
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GS748T Smart Switch Hardware Installation Guide
Electromagnetic Immunity
EN 55022 (CISPR 22), Class A
Safety
CE mark, commercial
CUL 60950 (Listed)/ EN60950 (Low Voltage Directive)page 3, see page 3, see
Modules
AGM731F 1000BASE-SX SFP GBIC for multimode fiber
AGM732F 1000BASE-LX SFP GBIC for single mode fiber
Technical Specifications B-3
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B-4 Technical Specifications
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Appendix C
Glossary
Table C-1. Glossary
10BASE-T The IEEE specification for 10 Mbps Ethernet over Category 3, 4, or 5
twisted-pair cable.
100BASE-FX The IEEE specification for 100 Mbps Fast Ethernet over fiber-optic cable.
100BASE-TX The IEEE specification for 100 Mb ps Fast Ethernet ov er Catego ry 5 twisted-
pair cable.
1000BASE-SX The IEEE specification for 1000 Mbps Gigabit Ethernet over fiber-optic
cable.
1000BASE-T The IEEE specification for 1000 Mbps Gigabit Ethernet over Category 5
twisted-pair cable.
Auto-negotiation A feature that allows twisted-pair ports to advertise their capabilities for
speed, duplex mode and flow control. When connected to a port that also
supports auto-negotiation, the link can automatically configure itself to the
optimum setup.
Auto Uplink A feature that allo ws twisted-pair ports to sense if a normal (MDI-X) or
uplink (MDI) connection is necessary and make the right link. It adjusts for
straight-through or crossover cables.
Backbone The p art of a network u sed as a p rimary p ath for t ransportin g traf fic betw een
network segments.
Bandwidth The information capacity, measured in bits per second th at a ch an nel cou ld
transmit. Bandwidth examples include 10 Mbps for Ethernet, 100 Mbps for
Fast Ethernet, and 1000 Mbps (I Gbps) for Gigabit Ethernet.
Baud The signaling rate of a line, that is, the number of transitions (voltage or
frequency changes) made per second. Also known as line speed.
Class of Service A term to describe treating different types of traffic with different levels of
service priority. Higher priority traffic gets faster treatment during times of
switch conges tion
Collision A term used to describe two colliding packets in an Ethernet network.
Collisions are a part of normal Ethernet operation, but a sudden prolonged
increase in the number of collisions can indicate a problem with a device,
particularly if it is not accompanied by a general increase in traffic.
Endstation A computer, printer, or server that is connected to a network.
Glossary C-1
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Table C-1. Glossary
Ethernet A LAN specification developed jointly by Xero x, In tel and Digi tal Equipment
Corporation. Ethernet networks transmit packets at a rate of 10 Mbps.
Fast Ethernet An Ethernet system that is designed to operate at 100 Mbps.
Gigabit Ethe rnet An Ethernet system that is designed to operate at 1000 Mbps (1 Gbps).
Fault isolation A technique for identifying and alerting administrators about connections
(such as those associated with switch ports) that are experiencing
congestion or failure, or exceeding an administrator-defined threshold.
Forwarding The process of sending a packet toward its destination using a networking
device.
Filtering The process of screening a packet for certain characteristics, such as
source address, destination address, or protocol. Filtering is used to
determine whether traffic is to be forwarded, and can also prevent
unauthorized access to a network or network devices.
Flow control A congestion- control mechanism. Congestion is caused by devices
sending traffic to already overload ed port on a swi tch. Flow co ntrol prevent s
packet loss and temporarily inhibits devices from generating more traffic
until the period of congestion ends.
Full-duplex A system that allows packets to be transmitted and received at the same
time and, in effect, doubles the potential throughput of a link.
Half-duplex A system that allows packets to transmitted and received, but not at the
same time. Contrast with full duplex.
IEEE Institute of Electrical and Electronics Engineers. Thi s American organi zation
was founded in 1963 and sets standards for computers and
communications.
IETF Internet Engineering Task Force. An organization responsible for providing
engineering solutions for TCP/IP networks. In the network management
area, this group is responsible for the development of the SNMP protocol.
IP Internet Protocol. IP is a layer 3 network protocol that is the standard for
sending data through a network. IP is part of the TCP/IP set of protocols
that describe the routing of packets to addressed devices.
IP address Internet Protocol address. A unique identifier for a device attached to a
network using TCP/IP. The address is written as four octets separated with
periods (full-stop s), and is m ade up of a ne twork sectio n, an option al subnet
section and a host section.
LAN Local Area Network. A network of endstations (such as PCs, printers,
servers) and network devices (hubs and switches) that cover a relatively
small geographic area (usually not larger than a floor or building).
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Table C-1. Glossary
Loop An event that occurs when two network devices are connected by more
than one path, thereby causing packets to repeatedly cycle around the
network and not reach their destination.
MAC Media Access Control. A protocol specified by the IEEE for determining
which devices have access to a network at any one time.
MAC address Media Access Control address; also called hardware or physical address.
Most devices that conn ect to a LAN hav e a MAC address assigned to them,
as they are used to identify other devices in a network.
Port monitoring The ability to monitor the traffic passing through a port on a device to
analyze network characteristics and perform troubleshooting.
Port speed The speed that a port on a device use s to communic ate with an other device
or the network.
Port trunking The ability to combine multiple ports on a device to create a single, high-
bandwidth connection.
Protocol A set of rules for communication between devices on a network.
Quality of Service A term to describe delay, throughput, bandwidth, and other factors that
measure the service quality provided to a user.
Segment A section of a LAN that is connected to the rest of the network using a
switch, bridge, or repeater.
SNMP Simple Network Management Protocol. An IETF standard protocol for
managing devices on a TCP/IP network.
Switch A device that interconnects several LANs to form a single logical LAN that
comprises of seve ral LAN seg ment s. Swi tches are s imila r to bri dges, in tha t
they connect LANs of a different type; however they connect more LANs
than a bridge and are generally more sophisticated.
TCP/IP Transmis si on Con trol Protocol/Internet Protoc ol . This is the name for two of
the most well-known protocols developed for the interconnection of
networks. Originally a UNIX standard, TCP/IP is now supported on almost
all platforms, and is the protocol of the Internet.
TCP relates to the content of the data traveling through a network —
ensuring that the information sent arrives in one piece when it reaches its
destination.
IP relates to the address of the endstation to which data is being sent, as
well as the address of the destination network.
Traffic prioritization Giving time-critical data traffic a higher quality of service over other, non-
critical data traffic.
VLAN Virtual LAN. A logical association that allows users to communicate as if
they were physically connected to a single LAN, independent of the actual
physical configuration of the network.
Glossary C-3
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C-4 Glossary
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NETGEAR, Inc.
4500 Great America Parkway
Santa Clara, CA 95054 USA
January 2007
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