Black Box LGB5028A User manual

LGB5028A Installation and Getting Started Guide
BL A C K B OX®
Network Administrator’s Installation and
Getting Started Guide
The switches provide 24 or 48 ports of Gigabit connectivity plus 4 10G
ports.
24 + or 48 + 4-Port Gigabit Managed Switch with SFP+ 10G
LGB5028A
LGB5052A
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [e-mail]
Customer
Support
Information

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Trademarks Used in this Manual
We‘re here to help! If you have any questions about your application
or our products, contact Black Box Tech Support at 724-746-5500
or go to blackbox.com and click on “Talk to Black Box.”
You’ll be live with one of our technical experts in less than 30 seconds.
Trademarks Used in this Manual
Black Box and the Double Diamond logo are registered trademarks of BB Technologies, Inc.
Intel is a registered trademark of Intel Corporation.
Xerox is a registered trademark of Intel Corporation.
Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

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LGB5028A Installation and Getting Started Guide
FCC and IC RFI Statements
Federal Communications Commission and Industry Canada Radio Frequency Interference
Statements
This equipment generates, uses, and can radiate radio-frequency energy, and if not installed and used properly, that is, in strict
accordance with the manufacturer’s instructions, may cause interference to radio communication. It has been tested and found to
comply with the limits for a Class A computing device in accordance with the specifications in Subpart B of Part 15 of FCC rules,
which are designed to provide reasonable protection against such interference when the equipment is operated in a commercial
environment. Operation of this equipment in a residential area is likely to cause interference, in which case the user at his own
expense will be required to take whatever measures may be necessary to correct the interference.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to
operate the equipment.
This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio
Interference Regulation of Industry Canada.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques
de la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par Industrie Canada.

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NOM Statement
Instrucciones de Seguridad
(Normas Oficiales Mexicanas Electrical Safety Statement)
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca de la tina de baño, lavabo, sótano mojado o cerca
de una alberca, etc.
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación.
Todo otro servicio deberá ser referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso. La colocación del aparato eléctrico
sobre una cama, sofá, alfombra o superficie similar puede bloquea la ventilación, no se debe colocar en libreros o gabinetes
que impidan el flujo de aire por los orificios de ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor como radiadores, registros de calor, estufas u otros
aparatos (incluyendo amplificadores) que producen calor.
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de operación, o como
se indique en el aparato.
12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados
sobre o contra ellos, poniendo particular atención a los contactos y receptáculos donde salen del aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.

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Network Administrator’s Installation and Getting Started Guide/Safety Instructions
Network Administrator’s Installation and Getting Started Guide
This guide gives specific information on how to operate and use the management functions of the switch.
The guide is intended for use by network administrators who are responsible for operating and maintaining network equipment;
consequently, it assumes a basic working knowledge of general switch functions, the Internet Protocol (IP), and Simple Network
Management Protocol (SNMP).
Conventions Used in this Manual
The following conventions are used throughout this guide:
NOTE: Emphasizes important information or calls your attention to related features or instructions.
CAUTION: Alerts you to a potential hazard that could cause loss of data, or damage the system or equipment.
WARNING: Alerts you to a potential hazard that could cause personal injury.
Safety Instructions
CAUTION: Circuit devices are sensitive to static electricity, which can damage their delicate electronics. Dry weather conditions or
walking across a carpeted floor may cause you to acquire a static electrical charge.
To protect your device, always:
• Touch the metal chassis of your computer to ground the static electrical charge before you pick up the circuit device.
• Pick up the device by holding it on the left and right edges only.
• If you need to connect an outdoor device to the switch with cable, then you need to add an arrestor on the cable between the
outdoor device and this switch.
NOTE: The switch is an indoor device; if it will be used in an outdoor environment or connect with an outdoor device, use a light-
ning arrestor to protect the switch.
Do not place the product outdoors in a sandstorm.
Before installation, make sure input power supply and product specifications are compatible with each other.
To reduce the risk of electric shock, disconnect all AC or DC power cords and RPS cables to completely remove power from the
unit.
Before importing/exporting configuration, make sure the firmware version is updated.
After a firmware upgrade, the switch will reset the configuration automatically to the latest firmware version.
For specific information on how to operate and use the management functions of the switch, see the 24 + 4 or 48 + 4 Gigabit
Managed Switch with (4) SFP and 10G User’s Manual.

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Table of Contents
Table of Contents
1. Specifications.........................................................................................................................................................................8
1.1 Physical Characteristics ..................................................................................................................................................8
1.2 Switch Features .............................................................................................................................................................8
1.3 Management Features...................................................................................................................................................8
1.4 Standards ......................................................................................................................................................................9
1.5 Compliances ..................................................................................................................................................................9
2. Overview ........................................................................................................................................................................ 10
2.1 Introduction................................................................................................................................................................. 10
2.2 Features....................................................................................................................................................................... 10
2.3 What‘s Included .......................................................................................................................................................... 10
2.4 Hardware Description.................................................................................................................................................. 11
2.4.1 LGB5028A........................................................................................................................................................ 11
2.4.2 LGB5052A........................................................................................................................................................ 12
3. Hardware Compatibility....................................................................................................................................................... 13
3.1 1000BASE-T Ports ....................................................................................................................................................... 13
3.2 SFP Transceiver Slots.................................................................................................................................................... 13
3.3 Port and System Status LEDs ....................................................................................................................................... 13
3.4 Power Supply Socket ................................................................................................................................................... 14
3.5 Mode Status LEDs ....................................................................................................................................................... 14
4. Network Planning................................................................................................................................................................ 16
4.1 Introduction to Switching ............................................................................................................................................ 16
4.2 Application Examples .................................................................................................................................................. 16
5. Installing the Switch ............................................................................................................................................................ 19
5.1 Selecting a Site ............................................................................................................................................................ 19
5.2 Ethernet Cabling.......................................................................................................................................................... 19
5.3 Equipment Checklist.................................................................................................................................................... 19
5.4 Package Includes ......................................................................................................................................................... 19
5.5 Mounting ....................................................................................................................................................................20
5.5.1 Rackmounting..................................................................................................................................................20
5.5.2 Desktop or Shelf Mounting.............................................................................................................................. 21
5.6 Installing an Optional SFP Transceiver ..........................................................................................................................22
5.7 Connecting to a Power Source....................................................................................................................................23
5.8 Connecting to the Console Port..................................................................................................................................24
6. Operation of Web-based Management ..............................................................................................................................25
7. Making Network Connections ............................................................................................................................................27
7.1 Connecting Network Devices ......................................................................................................................................27
7.2 Cabling Guidelines....................................................................................................................................................... 27
7.3 Connecting to PCs, Servers, Hubs, and Switches ........................................................................................................27
7.4 Network Wiring Connections......................................................................................................................................28
7.5 Fiber Optic SFP Devices................................................................................................................................................ 28
7.6 Connectivity Rules .......................................................................................................................................................29
7.7 1000-Mbps Gigabit Ethernet Collision Domain...........................................................................................................29
7.8 100-Mbps Fast Ethernet Collision Domain ..................................................................................................................30
8. Cable Labeling and Connection Records ............................................................................................................................. 31

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Table of Contents
9. Troubleshooting .................................................................................................................................................................32
9.1 Basic Troubleshooting Tips ......................................................................................................................................... 32
9.2 Contacting Black Box ................................................................................................................................................. 33
9.3 Shipping and Packaging............................................................................................................................................. 33
10. Power and Cooling Problems .............................................................................................................................................34
10.1 Installation..................................................................................................................................................................34
10.2 In-Band Access...........................................................................................................................................................34
11. Cables ........................................................................................................................................................................35
11.1 Twisted-Pair Cable and Pin Assignments.....................................................................................................................35
11.2 10BASE-T/100BASE-TX Pin Assignments ....................................................................................................................35
11.3 Straight-Through Wiring.............................................................................................................................................35
11.4 Crossover Wiring........................................................................................................................................................36
11.5 1000BASE-T Pin Assignments....................................................................................................................................36
11.6 Cable Testing for Existing Category 5 Cable ..............................................................................................................37
11.7 Adjusting Existing Category 5 Cabling to Run 1000BASE-F.......................................................................................37
11.8 Fiber Standards ..........................................................................................................................................................37
12. Glossary ........................................................................................................................................................................39

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Chapter 1: Specifications
1. Specifications
1.1 Physical Characteristics
Aggregate Bandwidth — LGB5028A: 28 Gbps;
LGB5052A: 52 Gbps
Buffer Architecture — 1392 KB on-chip frame buffer
Network Interface — LGB5028A: Ports 1–20: RJ-45 connector (Auto MDI-X);
10BASE-T: RJ-45 (100-ohm, UTP cable, Category 3 or better);
100BASE-TX: RJ-45 (100-ohm, UTP cable, Category 5 or better);
1000BASE-T: RJ-45 (100-ohm, UTP or STP cable, Category 5, 5e, or 6), Ports 21–24: RJ-45 connector/(100/1000M) SFP;
Ports 25–28: 1000M/10G SFP ports;
LGB5052A: Ports 1–44: RJ-45 connector (Auto MDI-X);
10BASE-T: RJ-45 (100-ohm, UTP cable, Category 3 or better);
100BASE-TX: RJ-45 (100-ohm, UTP cable, Category 5 or better);
1000BASE-T: RJ-45 (100-ohm, UTP or STP cable, Category 5, 5e, or 6, Ports 45–48: RJ-45 connector/(100/1000M) SFP,
Ports 45–48: RJ-45 connector/(100/1000M) SFP;
Ports 49–52: 1000M/10G SFP ports
Ports — LGB5028A: (20) 10/100/1000 Mbps twisted-pair, (4) 100M/1G SFP combo ports, (4) 1G/10Gbps fiber ports;
LGB5052A: (44) 10/100/100 Mbps twisted-pair, (4) 100M/1G SFP combo ports, (4) 1G/10Gbps fiber ports
Switching Database — 9K MAC address entries
Indicators — LEDs: System: Power; TP port: Status (LINK/ACT), 10/100/1000M;
SFP port: Status (LINK/ACT/SPD), 100/1000M
Temperature Tolerance — Operating: 32 to 104° F (0 to 40° C)
Humidity Tolerance — Operating: 5 to 90% (non-condensing(
Power — Input: 100–240 VAC, 50–60 Hz internal power supply;
Consumption: 60 watts maximum
Size — 1.8"H x 17.4"W x 11.8:D (4.4 x 44.2 x 30 cm)
Weight — LGB5028A: 8.6 lb. (3.9 kg);
LGB5052A: 9.1 lb. (4.1 kg)
1.2 Switch Features
Flow Control — Full-duplex: IEEE 802.3x;
Half-duplex: Backpressure
Forwarding Mode — Store-and-forward
Throughput — LGB5028A: 95.23 mpps (millions of packets per second) (64-byte packets), 128 Gbps (switching capacity);
LGB5052A: 130.95 mpps (64-byte packets), 136 Gbps (switching capacity);
Jumbo Frames: Frame sizes up to 9 KB supported on Gigabit interfaces
1.3 Management Features
In-Band Management — SSH/SSL, Telnet, SNMP, or HTTP
Out-of-Band Management — RS-232 (RJ-45 console port)
Software Loading — HTTP, TFTP in-band, console out-of-band

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Chapter 1: Specifications
1.4 Standards
Standards — IEEE 802.3 10BASE-T Ethernet (twisted-pair copper), IEEEE 802.3u 100BASE-TX Ethernet (twisted-pair copper),
IEEE 802.3ab 1000BASE-TX Ethernet (twisted-pair copper),
IEEE 802.3z 1000BASE-X Ethernet,
IEEE 802.3x Flow Control Capability,
ANSI/IEEE 802.3 Auto-negotiation,
IEEE 802.1Q VLAN,
IEEE 802.1p Class of Service,
IEEE 802.1X Access Control,
IEEE 802.1D Spanning Tree,
IEEE 802.1w Rapid Spanning Tree,
IEEE 802.1s Multiple Spanning Tree,
IEEE 802.3ad Link Aggregation Control Protocol (LACP)
IEEEE 802.1AB Link Layer Discovery Protocol (LLDP)
1.5 Compliances
Compliance — EN55022 (CISPR 22) Class A EN 61000-3; FCC Class A
Immunity — EN 61000-4-2/3/4/5/6/8/11, EN 55024

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Chapter 2: Overview
2. Overview
2.1 Introduction
The 24 + 4 or 48 + 4 Managed Gigabit Switches with 4 SFP+ 10G are easy-to-implement managed Ethernet switches. Models
have 24 or 48 ports of Gigabit Ethernet connectivity plus four 10G ports. These switches deliver more intelligent features to
improve the availability of your critical business applications, protect your sensitive information, and optimize your network
bandwidth to deliver information and applications more effectively. Both switches support advanced security management
capabilities and network features including data, voice, security, and wireless technologies. These switches are easy to deploy and
configure, providing the stable and quality performance network services your business needs. Typical applications include small
business and enterprise.
2.2 Features
• Performs wire-speed, non-blocking switching to enable wire-speed transport of multiple packets at low latency on all ports
simultaneously.
• Provides full-duplex capability on all ports, which effectively doubles the bandwidth of each connection.
• Uses store-and-forward technology to ensure maximum data integrity. With this technology, the entire packet must be received
into a buffer and checked for validity before being forwarded. This prevents errors from being propagated throughout the
network.
• You can also manage the switch over the network with a Web browser or Telnet application. Manage it in-band using SNMP or
RMON (Groups 1, 2, 3, 9) protocols. Configure and monitor the switch out-of-band via a null-modem serial cable. (See
Appendix B for wiring options.)
NOTE: For a detailed description of the management features, refer to the user’s manual.
2.3 What’s Included
Your package should include the following items. If anything is missing or damaged, contact Black Box Technical Support
at 724-746-5500 or [e-mail].
LGB5028A:
• 24 + 4 Managed Gigabit Switch with 4SFP+ 10G
• (4) adhesive rubber feet
• Mounting accessory (for 19" rack shelf, optional)
• (1) RS-232 to RJ-45 console cable
• (1) AC power cord
• (1) user’s manual on CD-ROM
• This installation guide
LGB5052A:
• 48 + 4 Managed Gigabit Switch with 4SFP+ 10G
• (4) adhesive rubber feet
• Mounting accessory (for 19" rack shelf, optional)
• (1) RS-232 to RJ-45 console cable
• (1) AC power cord
• (1) user’s manual on CD-ROM

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LGB5028A Installation and Getting Started Guide
Chapter 2: Overview
• This installation guide
2.4 Hardware Description
2.4.1 LGB5028A
FIgures 2-1 and 2-2 show the front and back panels of the LGB5028A. Table 2-1 describes its components.
25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
46
47
48 47 48 47 48 40 50 51 52
1 2 3 4
6 7 8 9 10
5
Figure 2-1. LGB5028A front panel.
11 12
Figure 2-2. LGB5028A back panel.
Table 2-1. LGB5028A components.
Number Component Description
1Mode button Switches between Link/Act mode and Speed mode.
2Switch TP Port LEDs In Speed mode, Link LED will light green (1000 Mbps) or amber (100 Mbps).
In Link/Act mode, LED lights to show Link and blinks to show Act.
3Switch combo port LEDs In Speed mode, Link LED will light green (1000 Mbps) or amber (100 Mbps).
In Link/Act mode, LED lights to show Link and blinks to show Act.
4Switch SFP port LEDs Light when Link is present; OFF when no link is present.
5Link/Act LED Lights when mode is set to Link/Act.
6System LED Lights when unit is powered ON.
7Speed LED Lights when mode is set to Speed.
8(24) 10/100 /1000BASE-T RJ-45 ports Copper Ethernet ports.
9100/1G SEP combo ports 1G/100 Mbps SFP ports
10 1G/10G SFP ports 10G/1G SFP ports
11 Console connector DB9 male console port
12 AC power socket IEC 320 power socket

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Chapter 2: Overview
2.4.2 LGB5052A
Figures 2-3 and 2-4 show the front and back panels of the LGB5052A. Table 2-2 describes its components.
12345678910111213 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
46
47
48 47 48 47 48 40 50 51 52
1 2 3 4
6 7 8 9 10
5
Figure 2-3. LGB5052A front panel.
11 12
Figure 2-4. LGB5052A back panel.
Table 2-2. LGB5052A components.
Number Component Description
1Mode button Switches between Link/Act mode and Speed mode.
2Switch TP Port LEDs In Speed mode, Link LED will light green (1000 Mbps) or amber (100 Mbps).
In Link/Act mode, LED lights to show Link and blinks to show Act.
3Switch combo port LEDs In Speed mode, Link LED will light green (1000 Mbps) or amber (100 Mbps).
In Link/Act mode, LED lights to show Link and blinks to show Act.
4Switch SFP port LEDs Light when Link is present; OFF when no link is present.
5Link/Act LED Lights when mode is set to Link/Act.
6System LED Lights when unit is powered ON.
7Speed LED Lights when mode is set to Speed.
8(48) 10/100/1000BASE-T RJ-45 ports Copper Ethernet ports.
9100/1G SEP combo ports 1G/100 Mbps SFP ports
10 1G/10G SFP ports 10G/1G SFP ports
11 Console connector DB9 male console port
12 AC power socket IEC 320 power socket

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LGB5028A Installation and Getting Started Guide
Chapter 3: Hardware Compatibility
3. Hardware Compatibility
3.1 1000BASE-T Ports
The switch contains 28 or 52 1000BASE-T RJ-45 ports. All RJ-45 ports support automatic MDI/MDI-X operation, autonegotiation,
and IEEE 802.3x autonegotiation of flow control, so the switch selects the optimum data rate and transmission automatically.
3.2 SFP Transceiver Slots
The LGB2028A and LGB5052A support the Small Form Factor Pluggable (SFP) transceiver slots for RJ-45 Ports 20–24 or 45–48. In
the default configuration, if an SFP transceiver (purchased separately) is installed in a slot and has a valid link on the port, the
associated RJ-45 port is disabled.
Table 3-1 shows a list of transceiver types that have been tested with the switch. To order transceivers, contact Black Box Technical
Support at 724-746-5500 or [e-mail]. For information on the recommended standards for fiber optic cabling, contact
Black Box Technical Support at 724-746-5500 or [e-mail].
Table 3-1. Supported SFP transceivers.
Media Standard
Fiber Diameter
(microns) Wavelength (nm) Maximum Distance
1000BASE-SX 50 /125 850 1760 feet (550 m)
1000BASE-SX 62.5/125 850 880 feet (275 m)
1000BASE-LX/LHX/XD/ZX 9 /125 1310 6.2, 18.6 miles (10, 30 km)
1000BASE-LX/LHX/XD/ZX 9 /125 1550 18.6, 31.1 miles (30, 50 km)
1000BASE-LX Single Fiber 9/125 TX: 1310/RX: 1550 6.2, 12.4 miles (10, 30 km)
1000BASE-LX Single Fiber 9/125 TX: 1550/RX: 1310 6.2, 12.4 miles (10, 30 km)
1000BASE-T N/A N/A 328 feet (100 m)
100-FX 62.5/125 1310 1.2 miles (2 km)
100-FX 9 /125 1310 12.4, 24.8, 37.3 miles (20, 40, 60 km)
NOTE: The maximum distance may vary for different SFP vendors.
3.3 Port and System Status LEDs
The LGB5028A or LGB5052A switch includes a display panel for system and port indications that simplify installation and network
troubleshooting. The LEDs are located on left hand side of the front panel for easy viewing. Details are shown in Figures 2-1 and
2-3 and described in Tables 3-2, 3-3, and 3-4.

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Chapter 3: Hardware Compatibility
Table 3-2. Port Status LEDs.
LED Condition Status
TP (Link/Act)
Green Lights green when TP link is good.
Blinking Blinks when traffic is present.
TP SPEED
Green Lights green when TP link speed is 1000 Mbps.
Yellow Lights yellow when TP link speed is 100 Mbps.
Off Off when TP link speed is 10 Mbps.
SFP (Link/Act)
Green Lights green when the SFP link is good.
Blinking Blinks when traffic is present.
SFP SPEED
Blue Lights blue when the SFP link speed is 10 Gbps.
Green Lights green when SFP link speed is 1000 Mbps.
Table 3-3. System Status LEDs.
LED Condition Status
System
Green Lights green when the switch is powered on.
OFF Off when the power is off.
3.4 Power Supply Socket
The LGB5028A and LGB5052A switches have an a standard power socket for an AC power cord.
AC line 100–240 VAC, 50–60 Hz, 60 Watts
Figure 3-1. AC power socket.
Figure 3-1. AC power socket.

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LGB5028A Installation and Getting Started Guide
Chapter 3: Hardware Compatibility
3.5 Mode Status LEDs
The LGB5028A or LGB5052A switch provides a mode switch function. There are two modes for all of each port’s LEDs. To switch
from LINK/ACT mode to SPEED mode, press the MODE button. When the switch is in LINK/ACT mode, each port’s LED shows
the Link or Act status. When the switch is in SPEED mode, each port’s LED shows the link speed status using different colors.
Table 3-4. Mode Status LED.
LED Condition Status
Link/ACT
Green Lights green when the ports are in Link/ACT mode.
Blinking Blinks when traffic is present.
SPEED
Blue Lights blue when the port speed is 10 Gbps.
Green Lights green when the port speed is 1000 Mbps.
Yellow Lights yellow when the port speed is 100 Mbps.
Off Off when the port speed is 10 Mbps.

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Chapter 4: Network Planning
4. Network Planning
4.1 Introduction to Switching
A network switch enables simultaneous transmission of multiple packets, and it can partition a network more efficiently than
bridges or routers. The switch is one of the most important devices for today’s networking technology.
When performance bottlenecks are caused by congestion at the network access point such as a file server, the device can be
connected directly to a switched port. And, by using full-duplex mode, the bandwidth of the dedicated segment can be doubled
to maximize throughput.
When networks are based on repeater (hub) technology, the distance between end stations is limited by a maximum hop count.
However, a switch can subdivide the network into smaller and more manageable segments, linking them to the larger network so
the hop count resets to zero and removes the limitation.
A switch can be easily configured in any Ethernet, Fast Ethernet, or Gigabit Ethernet network to significantly increase bandwidth
while using conventional cabling and network cards.
4.2 Application Examples
The LGB5028A and LGB5052A have 28 or 52 Gigabit Ethernet TP ports with Auto MDI-X and 4 slots for removable SFP
modules that support comprehensive types of fiber connection, such as LC and BiDi-LC modules. The switch is not only designed
to segment your network, but also to provide a wide range of options in setting up network connections. Typical
applications are described below.
Use the switch for the following applications:
• Remote site application in Enterprise or SMB.
• Peer-to-peer application in two remote offices.
• Office network.
• High-performance requirement environment.
• Advanced security for network safety applications.
• Data/voice and videoconference applications.

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Chapter 4: Network Planning
LGB5052A
Gigabit Ethernet
Switch
Gigabit Ethernet
Switch
Router
Gigabit Ethernet
Switch
PC
Server
PC
PC
PC
PC
PC
PC PC
Printer
Figure 4-1. Network connection between remote site and central site.
LGB5052A
AP server
PCs
Printer
Figure 4-2. Peer-to-peer network connection.

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Chapter 4: Network Planning
LGB5052A
Gigabit Managed
Switch
Gigabit Managed
Switch
Internet
Router
Figure 4-3 Office network connection.

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LGB5028A Installation and Getting Started Guide
Chapter 5: Installing the Switch
5. Installing the Switch
5.1 Selecting a Site
Mount the switch in a standard 19-inch equipment rack (via an optional rackmount kit) or place it on a flat surface. Be sure to fol-
low the guidelines below when choosing a location.
• The site should:
- Be at the center of all the devices you want to link and near a power outlet.
- Be able to maintain its temperature within 32 to 104° F (0 to 40° C) and its humidity within 10 to 90%, noncondensing.
- Be accessible for installing, cabling, and maintaining the devices.
- Enable the status LEDs to be clearly visible.
• Make sure the twisted-pair Ethernet cable is always routed away from power lines, radios, transmitters, or any other electrical
interference.
• Make sure that the LGB5028A or LGB5052A switch is connected to a separate grounded power outlet that provides 100
to 240 VAC, 50 to 60 Hz.
5.2 Ethernet Cabling
To ensure proper operation when installing the switch in a network, make sure that the current cables are suitable for 100BASE-
TX or 1000BASE-T operation. Check the following criteria against the current installation of your network:
• Cable type: Unshielded twisted pair (UTP) or shielded twisted pair (STP) cable with RJ-45 connectors; we recommend Category
5 or Category 5e with maximum length of 328 feet (100 meters) 100BASE-TX, and we recommend Category 5e or 6 with max-
imum length of 328 feet (100 meters) for 1000BASE-T.
• Protection from radio-frequency interference emissions.
• Electrical surge suppression.
• Separation of electrical wires and data-based network wiring.
• Safe connections with no damaged cables, connectors, or shields.
5.3 Equipment Checklist
After unpacking this switch, please check the contents to be sure you have received all the components. Then, before beginning
the installation, be sure you have all other necessary installation equipment.
5.4 Package Includes
LGB5028A:
• 24 + 4 Managed Gigabit Switch with 4SFP+ 10G
• (4) adhesive rubber feet
• Mounting accessory (for 19" rack shelf, optional)
• (1) RS-232 to RJ-45 console cable
• (1) AC power cord
• (1) user’s manual on CD-ROM
• This installation guide
LGB5052A:
• 48 + 4 Managed Gigabit Switch with 4SFP+ 10G

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Chapter 5: Installing the Switch
• (4) adhesive rubber feet
• Mounting accessory (for 19" rack shelf, optional)
• (1) RS-232 to RJ-45 console cable
• (1) AC power cord
• (1) user’s manual on CD-ROM
• This installation guide
NOTE: Notify your sales representative immediately if any of the items listed above are missing or damaged.
WARNING: The mini-GBICs are Class 1 laser devices. Avoid direct eye exposure to the beam coming from the transmit port.
5.5 Mounting
The switch can be mounted in a standard 19-inch equipment rack or on a desktop or shelf. See the mounting instructions
described next.
5.5.1 Rackmounting
Before rackmounting the switch, consider the following factors:
• Temperature: Since the temperature within a rack assembly may be higher than the ambient room temperature, check that the
rack environment temperature is within the specified operating temperature range (32 to 104° F [0 to 40° C]).
• Mechanical Loading: Do not place any equipment on top of a rackmounted unit.
• Circuit Overloading: Make sure that the supply circuit to the rack assembly is not overloaded.
• Grounding: Rackmounted equipment should be properly grounded.
To rackmount devices:
STEP 1: Attach the brackets to the device using the screws included with the rackmounting kit.
Figure 5-1. Attaching the brackets.