Black Box LGB5128A User manual

BLACK BOX®
Provides (20) Gigabit Ethernet SFP, (4) Gigabit
Ethernet Combo RJ-45/SFP, and (4) 1G/10G SFP+
connections.
This manual contains information for firmware version 1.59.
SFP Managed Switch Eco Quick Start Guide
LGB5128A
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/About 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 60 seconds.
Trademarks Used in this Manual
Black Box and the Double Diamond logo are registered trademarks of BB Technologies, Inc.
Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.
About this Manual
This manual gives specific information on how to operate and use the management functions of the switch. The manual 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, Internet Protocol (IP), and Simple Network
Management Protocol (SNMP).
Conventions
The following conventions are used throughout this guide to show information:
NOTE: Emphasizes important information or calls your attention to related features or instructions.
WARNING: Alerts you to a potential hazard that could cause personal injury.
CAUTION: Alerts you to a potential hazard that could cause loss of data, or damage the system or equipment.
Related Publications
For specific information on how to operate and use the management functions of the switch, visit www.blackbox.com and enter
LGB5128A in the search bar, then download the user’s manual, or download the user’s manual from
ftp://ftp.blackbox.com/anonymous/manuals/L/LGB5128A_USER_rev1.pdf.
For information about the command-line interface (CLI), visit www.blackbox.com and enter LGB5128A in the search bar, then
download the CLI guide, or download the CLI guide from
ftp://ftp.blackbox.com/anonymous/manuals/L/LGB5128A_USER_rev1.pdf.
Cable Types
You may use unshielded twisted-pair (UTP) for RJ-45 connections —Category 3 or better for 10-Mbps connections; Category 5
or better for 100-Mbps connections; Category 5, 5e, or 6 for 1000-Mbps connections. For fiber optic connections, you may use
50-/125- or 62.5-/125-micron multimode fiber or 9-/125-micron single-mode fiber.

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FCC and IC RFI Statements/CE Mark
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.
CE Mark
Declaration of Conformance for EMI and Safety (EEC)
This equipment has been tested and found to comply with the protection requirements of European Emission Standard EN55022/
EN61000-3 and the Generic European Immunity Standard EN55024.
EMC
EN55022(2006)+A1:2007/CISPR
22:2006+A1:2006
Class A
4K V CD, 8KV, AD
Throughput 130.9 Mpps
Flow control Full-duplex: IEEE 802.3x;
Half-duplex: Backpressure
EC61000-4-2 (2001) 3 V/m
IEC61000-4-3 (2002) 1 KV (power line), 0.5KV – (signal line)
IEC61000-4-4 (2004) Line to Line: 1KV, Line to Earth: 2KV
IEC61000-4-5 (2001) 130 dBuV (3V) Level 2
IEC61000-4-6 (2003) 1 A/m
IEC61000-4-8 (2001) Voltage dips:
>95%, 0.5 period,
30%, 25 periods
IEC61000-4-11(2001) Voltage interruptions: >95%, 250 periods

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Safety Instructions
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 this device with outdoor devices, then you must add an arrester on the cable between the outdoor
device and this device.
NOTE: The switch is an indoor device; if it will be used in outdoor environment or connects with some outdoor device,
use a lightning arrester to protect the switch.
WARNING:
• Do not demolish the product. If damage is caused by self-demolition, you will be charged a fee for repair.
• Do not place the product outdoors or in a sandstorm.
• Before installation, make sure the 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 cables to completely remove power from the unit.
• Before importing/exporting a configuration, make sure the firmware version is the same.
• After a firmware upgrade, the switch will replace the configuration automatically with the latest firmware version.

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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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Table of Contents
Table of Contents
1. Specifications.........................................................................................................................................................................7
2. Overview ...............................................................................................................................................................................9
2.1 Introduction................................................................................................................................................................... 9
2.2 What’s Included ............................................................................................................................................................9
2.3 Front and Side Panels of the Switch ..............................................................................................................................9
2.4 Switch Architecture ..................................................................................................................................................... 10
2.5 Network Management Options................................................................................................................................... 10
2.6 Operation of Web-based Management ...................................................................................................................... 10
3. Hardware Description.......................................................................................................................................................... 11
3.1 1000BASE-T Ports ....................................................................................................................................................... 11
3.2 SFP and SFP+ Transceiver Slots .................................................................................................................................... 11
3.3 Port and System Status LEDs ....................................................................................................................................... 11
3.4 Power Supply Sockets.................................................................................................................................................. 12
4. Installing the Switch ............................................................................................................................................................ 13
4.1 Selecting a Site............................................................................................................................................................ 13
4.2 Ethernet Cabling.......................................................................................................................................................... 13
4.3 Equipment Checklist.................................................................................................................................................... 14
4.4 Mounting .................................................................................................................................................................... 14
4.4.1 Rackmounting ................................................................................................................................................... 14
4.4.2 Desktop or Shelf Mounting............................................................................................................................... 16
4.5 Installing an Optional SFP Transceiver.......................................................................................................................... 16
4.6 Connecting to an AC Power Source............................................................................................................................ 17
4.7 Connecting to a DC Power Source.............................................................................................................................. 18
4.8 Wiring Map for Serial Cable ........................................................................................................................................ 18
4.9 Fiber Optic SFP+ Devices ............................................................................................................................................. 18
4.10 Connectivity Rules ....................................................................................................................................................... 19
4.11 1000BASE-T Cable Requirements................................................................................................................................20
4.12 1000-Mbps Gigabit Ethernet Collision Domain...........................................................................................................20

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Chapter 1: Specifications
1. Specifications
1.1 Physical Characteristics
Aggregate Bandwidth 128 Gbps for the LGB5128A switch
Buffer Architecture 1392 KB on-chip frame buffer
Network Interface Ports 1-20: SFP connector,
10BASE-T: RJ-45 (100-ohm, UTP cable; Category 3 or better)
100BASE-TX: RJ-45 (100-ohm, UTP cable; Category 5 or better)
1000BASE-T: RJ-45 (100-ohm, UTP, or STP cable; Category 5, 5e, or 6);
Maximum Cable Length: 328 ft (100 m)
Ports 21-24: RJ-45 connector/(100/1000M) SFP;
Ports 25-28: 1G/10G SFP+
Switching Database 32K MAC address entries
Connectors (20) 10 /100/1000Mbps SFP;
(4) Gigabit Ethernet Combo Port TP/ (100/1000M) SFP;
(4) (1G/10G) SFP+
Environment Temperature Tolerance: Operating: 32 to 140° F (0 to 60° C);
Humidity Tolerance: Operating: 5% to 90% (non-condensing)
Power Power A: 100 to 240 VAC, 50–60 Hz;
Power B: -36 VDC to -48 VDC
Power Supply:
Power A: Output: 12 VDC, 70 Watts
Power B: Output: 12 VDC, 70 Watts
Power Consumption: 55 Watts maximum
Dimensions 1.7"H x 17.4"W x 8.3"D (4.4 x 44.2 x 21.1 cm)
Weight 6.83 lb. (3.1 kg)
1.2 Switch Features
Forwarding Mode Store-and-forward
Throughput 130.9 Mpps
Flow control Full-duplex: IEEE 802.3x;
Half-duplex: Backpressure

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Chapter 1: Specifications
1.3 Management Features
Approvals Emissions:
EN55022 (CISPR 22) Class A EN 61000-3;
FCC Class A;
CE Mark;
Immunity:
EN 61000-4-2/3/4/5/6/8/11;
EN 55024
In-Band Management SSH/SSL, Telnet, SNMP, or HTTP
Software Loading HTTP, TFTP in-band,
Console out-of-band
Standards IEEE 802.3 => 10BASE-T Ethernet (Twisted-pair Copper)
IEEE 802.3u => 100BASE-TX Ethernet (Twisted-pair Copper)
IEEE 802.3ab => 1000BASE-TX Ethernet (Twisted-pair Copper)
IEEE 802.3z => 1000BASE-X Ethernet
IEEE 802.3ae => 10GBASE-SR/ER 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)
IEEE 802.1AB => Link Layer Discovery Protocol (LLDP)

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Chapter 2: Overview
2. Overview
2.1 Introduction
The Gigabit SFP Managed Switch Eco provides a reliable infrastructure for your small business or enterprise network. The switch’s
intelligent features enable you 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. Plus, the switch is easy to set up
and use.
The Gigabit SFP Managed Switch Eco has (24) Gigabit Ethernet ports and (4) 10G Ethernet ports. The switch supports advanced
security management capabilities and network features for data, voice, security, and wireless technologies. It’s easy to deploy and
configure, providing stable and quality performance network services.
2.2 What’s Included
Your package should contain the following items. If anything is missing or damaged, contact Black Box Technical Support
at 724-746-5500 or [e-mail].
• Gigabit SFP Managed Switch Eco
• (4) adhesive rubber feet
• Mounting accessory for 19" rack shelf
• (1) RS-232 DB9-to-DB9 cable
• (1) AC power cord
To download the user manual, visit www.blackbox.com and enter LGB5128A in the search bar, then download the user’s manual,
or download the user’s manual from ftp://ftp.blackbox.com/anonymous/manuals/L/LGB5128A_USER_rev1.pdf.
To download the command-line interface (CLI) guide, go to ftp://ftp.blackbox.com/anonymous/manuals/L/LGB5128A_CLI_rev1.
pdf.
2.3 Front and Side Panels of the Switch
Figure 2-1. Front of the switch.

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Chapter 2: Overview
Figure 2-2. Side panel of the switch (fan location).
2.4 Switch Architecture
The switch transports multiple packets at wire-speed and low latency on all ports simultaneously. It operates in full-duplex mode
on all ports to effectively double the bandwidth of each connection.
This switch 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.
2.5 Network Management Options
You can manage the switch over the network with a Web browser or Telnet application. Its built-in network management agent
helps you manage NMP or RMON (Groups 1, 2, 3, 9) protocols.
NOTE: For a detailed description of the management features, refer to the user’s manual. To download the user manual, visit
www.blackbox.com and enter LGB5128A in the search bar, then download the user’s manual, or download the user’s
manual from ftp://ftp.blackbox.com/anonymous/manuals/L/LGB5128A_USER_rev1.pdf.
2.6 Operation of Web-based Management
The default values of the LGB5128A are listed below:
IP address : 192.168.1.1
Subnet mask: 255.255.255.0
Default gateway: 192.168.1.254
User name: admin
Password: (blank)
First, configure your device’s Ethernet interface to be in the same subnet as the LGB5128A switch. Then, you can browse
to the LGB5128A. For example, if you type http://192.168.1.1, it will show the login screen and ask you to input a username
and password to login and authorize access to the switch.
The default username is “admin,” and the default password is blank. The first time you access the switch, enter the default
username. At the password prompt, simply press the enter key. Next, click the “Login” button.

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Chapter 3: Hardware Description
3. Hardware Description
3.1 1000BASE-T Ports
The switch has 10/100/1000BASE-T RJ-45 ports. All RJ-45 ports support automatic MDI/MDI-X operation, auto-negotiation, and
IEEE 802.3x auto-negotiation of flow control, so the switch automatically selects the optimum data rate and transmission.
3.2 SFP Transceiver Slots
The switch supports Small Form Factor Pluggable (SFP) transceiver slots on ports 1 to 24. It also supports four combo interface
(RJ-45/SFP) ports 21 to 24, which can each be configured as RJ-45 or SFP ports. In the default configuration, if an SFP transceiver
(part numbers LFP401–LFP404, LFP411–LFP416) is installed in a slot and has a valid link on the port, the associated RJ-45 port is
disabled. Ports 25 to 28 support 10GbE SFP+ transceiver (part numbers LSP421 and LSP422) slots, a high performance interface
for backbone uplink.
3.3 Port and System Status LEDs
The switch includes a display panel for system and port LEDs that simplify installation and network troubleshooting. The LEDs,
located on the left hand side of the front panel for easy viewing, are shown below and described in the following table.
Figure 3-1. Port status LEDs on the front panel.
Table 3-1. Port Status LEDs
LED Color Status
P1–P24 SFP Link/Act/Speed Green/Amber Lights when fiber connection with the remote device is good.
Blinks when any traffic is present.
Lights Green when linking to 1000 Mbps.
Lights Amber when linking to 100 Mbps.
P21–P24 TP Link/Act/Speed Green/Amber Lights Green when TP link on 10-/1000-Mbps speed.
Lights Amber when TP link on 100-Mbps speed.
Blinks when any traffic is present.
P25–P26 SFP+ Link/Act/Speed Green/Amber Lights Green when SFP+ link on 10-Gbps speed.
Lights Amber when SFP+ link on 1-Gbps speed.
Blinks when any traffic is present.
MGMT TP Link/Act/Speed Green/Amber Lights Green when TP link on 10-/1000-Mbps speed.
Lights Amber when TP link on 100-Mbps speed.
Blinks when any traffic is present.

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Chapter 3: Hardware Description
Figure 3-2. System Status LEDs on the front panel.
Table 3-2. System Status LEDs
LED Color Status
PWR AC Green Lights when power is on.
PWR DC Green Lights when power is on.
SYS Green/ Amber Blinks when system is booting.
Lights when system is coming up.
ALARM Red Normally off; only system error will turn the light on.
3.4 Power Supply Sockets
There are dual power inputs on the front panel of the switch for power redundancy. The switch has a 100 to 240 VAC power
socket for AC power Input and a -36 to -48 VDC power input via terminal block.
100 to 240-VAC -36 VDC to -48 VDC
Power Input Power Input
Figure 3-3. Power supply connectors.

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Chapter 4: Installing the Switch
4. Installing the Switch
4.1 Selecting a Site
NOTE: The switch can be mounted in a standard 19-inch equipment rack (via the included rackmount kit). Follow the guidelines
below when choosing a location.
The site should:
• Be located 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 140° F (0 to 60° C) and its humidity within 10% to 90%, non-condensing.
• Be accessible for installing cabling and maintaining the devices.
• Allow the status LEDs to be clearly visible.
NOTES:
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 switch is connected to a separate grounded power outlet.
4.2 Ethernet Cabling
To ensure proper operation when installing the switch into 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 a maximum length of 328 feet (100 meters) for 100BASE-TX, and Category 5e or 6 with a maximum
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.
Figure 4-1. RJ-45 connections.

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Chapter 4: Installing the Switch
Figure 4-2. SFP transceiver.
4.3 Equipment Checklist
After unpacking this switch, please check the contents to be sure you have received all the components (listed below and in
Section 2.2). Then, before beginning the installation, be sure you have all other necessary installation equipment.
• Gigabit SFP Managed Switch Eco
• (4) adhesive rubber feet
• Mounting accessory for 19" rack shelf
• (1) RS-232 DB9-to-DB9 cable
• (1) AC power cord
To download the user manual, visit www.blackbox.com and enter LGB5128A in the search bar, then download the user’s manual,
or download the user’s manual from ftp://ftp.blackbox.com/anonymous/manuals/L/LGB5128A_USER_rev1.pdf.
WARNING: The SFP/SFP+ modules are Class 1 laser devices. Avoid direct eye exposure to the beam coming from the transmit
port.
4.4 Mounting
The switch can be mounted in a standard 19-inch equipment rack or on a desktop or shelf. Mounting instructions for each type
of site follows.
4.4.1 Rackmounting
Before rackmounting the switch, please pay attention to the following factors:
• Temperature: Since the temperature within a rack assembly may be higher than the ambient room temperature, check that the
rack environment temperature is within the specified operating temperature range 32 to 140° F (0 to 60 °C).
• Mechanical Loading: Do not place any equipment on top of a rackmounted unit.
• Circuit Overloading: Be sure that the supply circuit to the rack assembly is not overloaded.
• Grounding: Rackmounted equipment should be properly grounded.

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Chapter 4: Installing the Switch
To rackmount Devices: (Optional)
Step 1. Attach the brackets to the device using the screws provided in the mounting accessory.
Figure 4-3. Attaching the brackets.
Step 2. Mount the device in the rack (via the rackmount kit), using four rackmounting screws (not provided). Be sure to secure the
lower rackmounting screws first to prevent the brackets from bending from the weight of the switch.
Figure 4-3. Installing the switch in a rack.

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Chapter 4: Installing the Switch
Step 3. If installing a single switch only, go to Section 4.6 or 4.7 in this manual.
Step 4. If installing multiple switches, mount them in the rack, one below the other, in any order.
4.4.2 Desktop or Shelf Mounting
Step 1. Attach the four adhesive rubber feet to the bottom of the first switch.
Figure 4-5. Attaching the adhesive rubber feet.
Step 2. Set the device on a flat surface near an AC power source, with at least two inches of space on all sides for proper airflow.
Step 3. If installing a single switch only, go to Section 4.6 or 4.7 in this manual.
Step 4. If installing multiple switches, attach four adhesive feet to each one. Place each device squarely on top of the one below,
in any order.
4.5 Installing an Optional SFP Transceiver
You can install or remove an SFP/SFP+ module from an SFP/SFP+ slot without having to power off the switch. Use only
compatible SFPs (see Table 4-1).
Table 4-1. Compatible Black Box SFPs.
Table 4-1. Compatible Black Box SFPs.
Part Number Product Name
LFP401–LFP404 155-Mbps Extended Diagnostic SFP
LFP411–LFP414, LFP416* 1250-Mbps Extended Diagnostic SFP
LSP421–LSP422 10GBASE-SR SFP, 10GBASE-LR SFP
*Supports LFP416 with auto mode of link speed on Ports 1–20 and does not support LFP415.
NOTES:
The SFP slots are shared with the four 10/100/1000BASE-T RJ-45 ports. If an SFP is installed in a slot, the associated RJ-45 port is
disabled and cannot be used.

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Chapter 4: Installing the Switch
NOTES (Continued):
The SFP ports operate only at full duplex. Half-duplex operation is not supported.
Ensure the network cable is NOT connected when you install or remove an SFP module.
CAUTION: Use only supported SFP modules with your switch (see Table 4-1).
Figure 4-6. Inserting an SFP transceiver into a slot.
To install an SFP transceiver, do the following:
Step 1. Consider network and cabling requirements to select an appropriate SFP transceiver type.
Step 2. Insert the transceiver with the optical connector facing outward and the slot connector facing down.
NOTE: SFP transceivers are keyed so they can only be installed in one orientation.
Step 3. Slide the SFP transceiver into the slot until it clicks into place.
NOTE: SFP transceivers are not provided in the switch package.
4.6 Connecting to an AC Power Source
You can plug or remove an AC power cord through the AC socket from the AC power source.
Figure 4-7. Inserting the AC power cord into the AC socket to power on this switch.
Step 1. Insert the AC power cord directly into the AC socket located at the front of the switch.
Step 2. Plug the other end of the power cord into an AC power source.
Step 3. Check the front-panel LEDs as the device is powered on to be sure the POWER LED is lit. If not, check that the power

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Chapter 4: Installing the Switch
cable is correctly plugged in.
4.7 Connecting to a DC Power Source
You can plug or remove a DC power cable through the DC terminal block from an external 48-VDC power source.
Figure 4-6. Inserting the DC power cable into the DC terminal block to power on this switch.
Step 1. Insert the DC cable plug directly into the DC terminal block located at the front of the switch.
Step 2. Plug the other end of the cable into an external DC power source.
Step 3. Check the front-panel LEDs as the device is powered on to be sure the POWER LED is lit. If not, check that the power
cable is correctly plugged in.
4.8 Wiring Map for Serial Cable
Table 4-2. Serial cable wiring.
NOTE: The switch does not support crossover cable for the console port.
4.9 Fiber Optic SFP+ Devices
An optional 10G SFP+ transceiver can be used for a backbone connection between switches, or for connecting to a high-speed
server.
Each single-mode fiber port requires 9-/125-micron single-mode fiber optic cable with an LC connector at both ends. Each
multimode fiber optic port requires 50-/125- or 62.5-/125-micron multimode fiber optic cabling with an LC connector at both
ends.
WARNING: This switch uses lasers to transmit signals over fiber optic cable. Never look directly at a transmit port when it is

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Chapter 4: Installing the Switch
powered on.
WARNING: When selecting a fiber SFP device, make sure that it can function at a temperature that is not less than the
recommended maximum operational temperature of the product. You must also use an approved Laser SFP
transceiver.
Step 1. Remove and keep the LC port’s rubber plug. When not connected to a fiber cable, replace the rubber plug to protect the
optics.
Step 2. Check that the fiber terminators are clean. You can clean the cable plugs by wiping them gently with a clean tissue or
cotton ball moistened with a little ethanol. Dirty fiber terminators on fiber optic cables will impair the quality of the light
transmitted through the cable and lead to degraded performance on the port.
Step 3. Connect one end of the cable to the LC port on the switch and the other end to the LC port on the other device. Since
LC connectors are keyed, the cable can be attached in only one orientation.
Figure 4-8. Making fiber port connections.
Step 4. As a connection is made, check the Link LED on the switch corresponding to the port to be sure that the connection is
valid.
The fiber optic ports operate at 1 Gbps. The maximum length for fiber optic cable operating at Gigabit speed will depend on the
fiber type as listed in Section 4.12, 1000-Mbps Gigabit Ethernet Collision Domain.
4.10 Connectivity Rules
NOTE: When adding hubs to your network, switches break up the path for connected devices into separate collision domains, so
you don’t include the switch or connected cabling in your calculations for cascade length involving other devices.

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Chapter 4: Installing the Switch
4.11 1000BASE-T Cable Requirements
All Category 5 UTP cables that are used for 100BASE-TX connections should also work for 1000BASE-T, providing that all four
wire pairs are connected. However, we recommend that for all critical connections, or any new cable installations, you use
Category 5e or Category 6 cable. The Category 5e and 6 specifications include test parameters that are only recommendations
for Category 5. Therefore, the first step in preparing existing Category 5 cabling for running 1000BASE-T is a simple test of the
cable installation to be sure that it complies with the IEEE 802.3-2005 standards.
4.12 1000-Mbps Gigabit Ethernet Collision Domain
Table 4-3. 1000-Mbps Gigabit Ethernet collision domain.
Maximum 1000BASE-T Gigabit Ethernet cable domain.
Cable Type Maximum Cable Length Connector
Category 5, 5e, or 6
100-ohm UTP or STP
328 ft. (100 m) RJ-45
Maximum 1000BASE-SX Gigabit fiber cable length.
Fiber Size Fiber Bandwidth Maximum Cable Length Connector
62.5-/125-micron
multimode fiber
160 MHz/km
200 MHz/km
722 ft. (220 m)
902 ft. (275 m)
LC
50-/125-micron
multimode fiber
400 MHz/km
500 MHz/km
1641 ft. (500 m)
1805 ft. (550 m)
LC
Maximum 1000BASE-LX/LHX/XD/ZX Gigabit fiber cable length.
Fiber Size Fiber Bandwidth Maximum Cable Length Connector
9- /125-micron
single-mode fiber
1310 nm
N/A 6.2 miles (10 km) LC
9- /125-micron
single-mode fiber
1550 nm
N/A 18.64 miles
(30 km)
31.06 miles
(50 km)
LC
Maximum 1000BASE-LX Single Fiber Gigabit fiber cable length.
Fiber Size Fiber Bandwidth Maximum Cable Length Connector
Single-mode
TX: 1310 nm
RX: 1550 nm
N/A 12.42 miles (20 km) BIDI LC
Single-mode
TX: 1550 nm
RX: 1310nm
N/A 12.42 miles (20 km) BIDI LC
100-Mbps Fast Ethernet collision domain.
Cable Type Maximum Cable Length Connector
Category 5, 5e or 6
100-ohm
UTP or STP
328 ft. (100 m) RJ-45