INSTALLATION & GETTING STARTED GUIDE
LGB5028A-R2, LGB5052A-R2
GBE
MANAGED
SWITCHES
24/7 TECHNICAL SUPPORT AT 1.877.877.2269 OR VISIT BLACKBOX.COM
System
System
Link/Act
Link/Act
Speed
28-PORT GbE MANAGED SWITCH
28-PORT GbE MANAGED SWITCH
Speed
Mode
Mode
1 3 5 972 4 6 8 10 12
3
1
2
4 6
5
7 9
11
13 15 17
14 18
13
14 16
16
15 17 21 2319
10
118
12
19 21
20
20
2323
22 24
22
SFP/SFP+
SFP/SFP+
25
25
2418
27 28
26
26
28
27
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TABLE OF CONTENTS
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SAFETY INFORMATION .................................................................................................................................................................... 4
RELATED PUBLICATIONS ................................................................................................................................................................. 5
REVISION HISTORY .......................................................................................................................................................................... 5
1. INTRODUCTION ............................................................................................................................................................................. 6
1.1 O ve r view .................................................................................................................................................................................................... 6
1.2 Front View of the Switch .......................................................................................................................................................................... 6
1.3 Rear View of the Switch ........................................................................................................................................................................... 6
1.4 Switch Architecture .................................................................................................................................................................................. 7
1.5 Network Management Options ............................................................................................................................................................... 7
2. HARDWARE DESCRIPTION .......................................................................................................................................................... 8
2.1 1000BASE-T Ports .................................................................................................................................................................................... 8
2.2 SFP+ Transceiver Slots ............................................................................................................................................................................8
2.3 Port and System Status LEDs ............................................................................................................ .....................................................9
3. INSTALLING THE SWITCH.......................................................................................................................................................... 10
3.1 What’s Included ......................................................................................................................................................................................10
3.2 Selecting a Site ....................................................................................................................................................................................... 10
3.3 Ethernet Cabling .....................................................................................................................................................................................10
3.4 Mounting the Switch in a 19-inch Rack ................................................................................................................................................ 11
3.5 Mounting the Switch on a Desk or Shelf .............................................................................................................................................. 12
3.6 Installing an Optional SFP Transceiver ................................................................................................................................................13
3.7 Connecting to a Power Source ..............................................................................................................................................................14
3.8 Connecting to the Console Port ............................................................................................................................................................15
3.9 Wiring Map for Serial Cable (LGB5028A-R2 Only) ............................................................................................................................... 15
3.10 Operation of Web-Based Management .............................................................................................................................................. 16
4. MAKING NETWORK CONNECTIONS ......................................................................................................................................... 17
4.1 Connecting Network Devices ................................................................................................................................................................17
4.2 Twisted-Pair Devices .............................................................................................................................................................................17
4.3 Cabling Guidelines .................................................................................................................................................................................17
4.4 Connecting to PCs, Servers, Hubs and Switches ............................................................................................................ .................... 17
4.5 Network Wiring Connections ................................................................................................................................................................18
4.6 Fiber Optic SFP Devices ........................................................................................................................................................................ 18
4.7 Connectivity Rules..................................................................................................................................................................................19
4.8 1000BASE-T and Fiber Cable Requirements .......................................................................................................................................19
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5. CABLE LABELING CONNECTION AND RECORDS .................................................................................................................... 21
6. TROUBLESHOOTING ................................................................................................................................................................... 22
7. POWER AND COOLING PROBLEMS ........................................................................................................................................... 23
7.1 Installation ............................................................................................................................................................................................... 23
7.2 In-Band Access ....................................................................................................................................................................................... 23
8. SPECIFICATIONS ......................................................................................................................................................................... 24
APPENDIX A. REGULATORY INFORMATION ................................................................................................................................ 26
A.1 FCC Statement ....................................................................................................................................................................................... 26
A.2 NOM Statement ..................................................................................................................................................................................... 27
APPENDIX B. DISCLAIMER/TRADEMARKS ................................................................................................................................. 28
B.1 Disclaimer ............................................................................................................................................................................................... 28
B.2 Trademarks Used in this Manual ............................................................................................................ ..............................................28
The switch’s default values are listed below:
IP Address: 192.16 8.1.1
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.254
Username: admin
Password: <none> (Just press the Enter key.)
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SAFETY INFORMATION
SAFETY INFORMATION
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 to an outdoor device, add an arrester on the cable between the outdoor device and this device.
NOTE: The switch is indoor device; if it will be used in an outdoor environment or connects with an outdoor device, you must use
a lightning arrester to protect the switch.
WARNING:
Self-demolition on the product is strictly prohibited. Damage caused by self-demolition will be charged repairing fees.
Do not place product at outdoor or 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 cord and RPS cables to completely remove power from the unit.
Before importing/exporting a configuration, make sure the firmware version is always the same.
After a firmware upgrade, the switch will replace the configuration automatically with the latest firmware version.
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WARNING: EYE HAZARD! The SFP modules are Class 1 laser devices. Do not look direcly at the beam coming from the transmit
port.
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RELATED PUBLICATIONS/REVISION HISTORY
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RELATED PUBLICATIONS
The following publications give specific information on how to operate and use the management functions of the switch:
GUI User Guide
CLI User Guide
To download the user guides from blackbox.com:
1. Go to www.blackbox.com
2. Enter the part number in the search box (for example, LGB5028A-R2 or LGB5052A-R2).
3. Click on the product in the “Products” page.
4. Click on the “Support” tab on the product page and select the document you wish to download.
REVISION HISTORY
Current version: Release 6.38, Revision A1
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CHAPTER 1: HEADLINE
CHAPTER 1: INTRODUCTION
1.1 OVERVIEW
This LGB5028A-R2, LGB5052A-R2 Gigabit Ethernet (GbE) Managed Switches offer a full suite of L2 Ethernet Switch features and
additional 10GbE uplink connections, including advanced L3 features such as Static Route for Enterprise networks via fiber or
copper connections.
LGB5028A-R2 has 24 (10M/100M/1G) RJ-45 ports, 4 GbE/10G SFP+ ports and DB9 console port.
LGB5052A-R2 has 48 (10M/100M/1G) RJ-45 ports, 4 GbE/10G SFP+ ports and an RJ-45 console port.
Both switches provide high hardware performance and environment flexibility for SMBs and Enterprises.
The switches are ideal to deliver management simplicity, optimum user experience, and lower cost. The embedded Device
Managed System is designed to be extremely easy-to-use/manage/install IP Phone, IP Cam, or Wifi-AP for Enterprise Applications.
1.2 FRONT VIEW OF THE SWITCH
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FIGURE 1-1. FRONT PANEL OF THE LGB5028A-R2 SWITCH
1.3 REAR VIEW OF THE SWITCH
Console
port
FIGURE 1-2. BACK PANEL OF THE LGB5028A-R2 SWITCH
Mode
LEDs
System
LED
Mode
button
10/100/1000
RJ-45 ports
Port S tatus
LEDs
1G/10 G
SFP+ p orts
AC power
socket
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1.4 SWITCH ARCHITECTURE
The switch performs wire-speed, non-blocking switching. This allows wire-speed transport of multiple packets at low latency on all
ports simultaneously. The switch also features full-duplex capability on all ports, which effectively doubles 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.
1.5 NETWORK MANAGEMENT OPTIONS
The switch can also be managed over the network with a web browser or Telnet application. The switch includes a built-in network
management agent that allows it to be managed in-band using SNMP or RMON (Groups 1, 2, 3, 9) protocols. The LGB5028A-R2 has
a DB9 console port and the LGB5052A-R2 has an RJ-45 console port connector for out-of-band management.
A PC may be connected to this port for configuration and monitoring out-of-band via a null-modem serial cable.
NOTE: For a detailed description of the management features, refer to the user guides.
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CHAPTER 1: HEADLINE
CHAPTER 2: HARDWARE DESCRIPTION
2.1 1000BASE-T PORTS
The switch contains 24 or 48 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 optimum data rate and transmission can be selected automatically.
2.2 SFP+ TRANSCEIVER SLOTS
The LGB5028A-R2 or LGB5052A-R2 switch supports the Small Form Factor Pluggable (SFP+) transceiver slots on ports 25-28
or 49-52.
The following table shows a list of transceiver types that have been tested with the switch. For an updated list of vendors supplying
these transceivers, contact your local dealer. For information on the recommended standards for fiber optic cabling, see Section
4.8 in Chapter 4.
TABLE 2-1. COMPATIBLE SFP/SFP+ MODULES
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PRODUCT CODE DESCRIPTION
LFP411 SFP, 1250-Mbps Fiber with Extended Diagnostics, 850-nm Multimode, 550 m LC
LF P412 SFP, 1250-Mbps Fiber with Extended Diagnostics, 1310-nm Multimode, 2 km LC
LF P413 SFP, 1250-Mbps Fiber with Extended Diagnostics, 1310-nm Single-Mode, 10 km LC
LFP414 SFP, 1250-Mbps Fiber with Extended Diagnostics, 1310-nm Single-Mode, 30 km LC
LF P415 SFP with SerDes Interface, 1250 Mbps, RJ45, 1000BASE-T, Extended Diagnostics
LFP416 SFP with SGMII Interface, 1250 Mbps, RJ45, 10/100/1000BASE-T, Extended Diagnostics
LFP417 SFP with SerDes Interface, 1250 Mbps, RJ45, 1000BASE-T, Extended Diagnostics
LFP418 SFP, 1250-Mbps Fiber with Extended Diagnostics, 1550-nm Single-Mode, 80 km, LC
LFP420 SFP, 1250-Mbps Simplex Fiber with Extended Diagnostics, 1550-nm TX, 1310-nm RX, Single-Mode, 10 km, LC
LFP421 SFP, 1250-Mbps Simplex Fiber with Extended Diagnostics, 1310-nm TX, 1550 -nm RX, Single-Mode, 10 km, LC
LFP4 01 SFP, 155-Mbps Fiber with Extended Diagnostics, 850-nm Multimode, 2 km, LC
LFP402 SFP, 155-Mbps Fiber with Extended Diagnostics, 1310-nm Multimode, 2 km, LC
LFP4 03 SFP, 155-Mbps Fiber with Extended Diagnostics, 1310-nm Single-Mode, 30 km, LC
LPF404 SFP, 155-Mbps Fiber with Extended Diagnostics, 1310-nm Single-Mode, 60 km, LC
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2.3 PORT AND SYSTEM STATUS LEDS
The LGB5028A-R2 and LGB5052A-R2 switches include 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 below and
described in the following tables.
TABLE 2-2. MODE STATUS LEDS
LED CONDITION STAT U S
TP Link/Act Green/Blinking
TP Speed Green/ Yellow
SFP Link/Act Green/Blinking
SFP Speed Blue/Green
Lights Green when TP link is good
Blinks when any traffic is present
Lights Green when TP link is running at 1000 Mbps
Yellow when TP link is running at 10/100 Mbps
Lights ON Green when SFP link is good
Blinks when any traffic is present
Lights Blue when SFP link is running at 10 Gbps
Lights Green when SFP link is running at 1000 Mbps
TABLE 2-2. SYSTEM STATUS LED
SYSTEM LED CONDITION STATE
Power
Green Lights ON when power is coming up
OFF Power is OFF
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CHAPTER 3: INSTALLING THE SWITCH
3.1 WHAT’S INCLUDED
Your package should include the following items. If anything is missing or damaged, contact Black Box Technical Support
at 877-877-2269 or info@blackbox.com
28-Port or 52-Port Gigabit Ethernet (GbE) Managed Switch
Rackmount brackets and hardware
AC power cord
DB9 console cable (for LGB5028A-R2) or RJ-45 console cable (for LGB5052A-R2)
(4) adhesive rubber feet
This Installation and Getting Started Guide
WARNING: EYE HAZARD! The SFP modules are Class 1 laser devices. Do not look direcly at the beam coming from the transmit
port.
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3.2 SELECTING A SITE
The Switch can be mounted in a standard 19-inch equipment rack (via an included rackmount kit) or on a flat surface. Be sure to
follow 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 113° F 0 to 45° 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.
Make sure the twisted-pair Ethernet cable is always routed away from power lines, radios, transmitters or any other electrical
interference.
Make sure that LGB5028A-R2, LGB5052A-R2 10Port Series Switch is connected to a separate grounded power outlet that provides
100 to 240 VAC, 50 to 60 Hz.
3.3 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: We recommend using Unshielded twisted pair (UTP) or shielded twisted pair (STP) cable with RJ-45 connectors;
Category 5 or Category 5e with maximum length of 328 feet (100 meters) for 100BASE-TX, and Category 5e or 6 with 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.
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3.4 MOUNTING THE SWITCH IN A 19-INCH RACK
Before rack mounting the switch, 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 of 32 to 113° F (0 to 45° 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.
To rackmount devices:
ST EP 1: Attach the brackets to the device using the screws provided in the rackmounting kit.
FIGURE 3-1. ATTACH THE MOUNTING BRACKETS
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STEP 2: Mount the device in the rack (via the included rackmount kit), using four rackmounting screws (included). Be sure to secure
the lower rack-mounting screws first to prevent the brackets being bent by the weight of the switch.
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FIGURE 3-2. INSTALL THE SWITCH IN THE R ACK
STEP 3: If installing a single switch only, go to Section 3.7, Connecting to a Power Source.
STEP 4: If installing multiple switches, mount them in the rack, one below the other, in any order.
3.5 MOUNTING THE SWITCH ON A DESK OR SHELF
STEP 1: Attach the four adhesive rubber feet to the bottom of the first switch.
STEP 2: Set the device on a flat surface near an AC power source, making sure there are at least two inches of space on all sides
for proper air flow.
STEP 3: If installing a single switch only, go to Section 3.7, Connecting to a Power Source.
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.
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3.6 INSTALLING AN OPTIONAL SFP TRANSCEIVER
You can install or remove an SFP transceiver from an SFP slot without having to power off the switch.
The SFP slots are shared with the four 10/100/1000BASE-T RJ-45 ports. If an SFP transceiver is installed in a slot, the associated
RJ-45 port is disabled and cannot be used.
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 transceiver.
CAUTION: Use only supported SFPs. Using incompatible SFPs may cause the switch to malfunction.
TABLE 3-1. COMPATIBLE SFP/SFP+ MODULES
PRODUCT CODE DESCRIPTION
LFP411 SFP, 1250-Mbps Fiber with Extended Diagnostics, 850-nm Multimode, 550 m LC
LF P412 SFP, 1250-Mbps Fiber with Extended Diagnostics, 1310-nm Multimode, 2 km LC
LF P413 SFP, 1250-Mbps Fiber with Extended Diagnostics, 1310-nm Single-Mode, 10 km LC
LFP414 SFP, 1250-Mbps Fiber with Extended Diagnostics, 1310-nm Single-Mode, 30 km LC
LF P415 SFP with SerDes Interface, 1250 Mbps, RJ45, 1000BASE-T, Extended Diagnostics
LFP416 SFP with SGMII Interface, 1250 Mbps, RJ45, 10/100/1000BASE-T, Extended Diagnostics
LFP417 SFP with SerDes Interface, 1250 Mbps, RJ45, 1000BASE-T, Extended Diagnostics
LFP418 SFP, 1250-Mbps Fiber with Extended Diagnostics, 1550-nm Single-Mode, 80 km, LC
LFP420 SFP, 1250-Mbps Simplex Fiber with Extended Diagnostics, 1550-nm TX, 1310-nm RX, Single-Mode, 10 km, LC
LFP421 SFP, 1250-Mbps Simplex Fiber with Extended Diagnostics, 1310-nm TX, 1550 -nm RX, Single-Mode, 10 km, LC
LFP4 01 SFP, 155-Mbps Fiber with Extended Diagnostics, 850-nm Multimode, 2 km, LC
LFP402 SFP, 155-Mbps Fiber with Extended Diagnostics, 1310-nm Multimode, 2 km, LC
LFP4 03 SFP, 155-Mbps Fiber with Extended Diagnostics, 1310-nm Single-Mode, 30 km, LC
LPF404 SFP, 155-Mbps Fiber with Extended Diagnostics, 1310-nm Single-Mode, 60 km, LC
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To install an SFP in the switch, follow these instructions:
ST EP 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: SFPs are ordered separately.
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FIGURE 3-3. INSTALL THE SFP MODULE IN THE SWITCH
3.7 CONNECTING TO A POWER SOURCE
You can plug or remove power cord from AC power socket, to switch the power on and off.
WARNING: For International use, you may need to change the AC line cord. You must use a line cord set that has been approved
for the socket type in your country.
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Inserting the Power Cord into AC Power Socket
ST EP 1: Insert the power cable plug directly into the AC socket located at the back of the switch.
STEP 2: Plug the other end of the cable into a grounded, 3-pin, 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 cable
is correctly plugged in.
FIGURE 3-4. INSERTING THE POWER CORD INTO THE AC POWER SOCKET
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3.8 CONNECTING TO THE CONSOLE PORT
The DB9 serial port on the LGB5028A-R2 switch’s back panel is used to connect to the switch for out-of-band console
configuration. The command-line-driven configuration program can be accessed from a terminal or a PC running a terminal
emulation program. The pin assignments are shown below.
NOTE: The LGB5052A-R2 switch has an RJ-45 serial console port (not pictured) located on the front panel of the switch to the right
of the SFP+ slots.
1 5
6 9
FIGURE 3-7. DB9 SERIAL PORT PINOUT FOR LGB5028A-R2
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3.9 WIRING MAP FOR SERIAL CABLE (LGB5028A-R2 ONLY)
The DB9 cable is used for connecting a terminal or terminal emulator to the LGB5028A-R2 Managed Switch’s RS-232 port to access
the command-line interface. An RJ-45 cable (not pictured) is used to connect the LGB5052A-R2 switch to the terminal or emulator.
TABLE 3-2. SERIAL CABLE WIRING
FUNCTION MNEMONIC PIN
Carrier Detect CD 1
Receive Data RD 2
Transmit Data TD 3
Data Terminal Ready DTR 4
Signal Ground GND 5
Data Set Ready DSR 6
Request to Send RTS 7
Clear to Send CTS 8
NOTE: No other pins are used.
CLI
FIGURE 3-8. PLUG INTO THE CONSOLE PORT
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The serial port’s configuration requirements are as follows:
Default Baud rate: 115,200 bps
Character Size: 8 Characters
Parity: None
Stop bit: One
Data bits: 8
Flow control: none
3.10 OPERATION OF WEB-BASED MANAGEMENT
The switch’s default values are listed below:
IP Address: 19 2 .168.1.1
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.254
Username: admin
Password: <none> (Just press the Enter key.)
To access the web management of LGB5028A-R2, LGB5052A-R2 switch, enter the default IP Address in your web browser and
press en te r. e.g., ht t p: //192.168.1.1
Once you have entered the IP Address into the web browser, you will be prompted to enter a Username and Password in order
to access the web management interface. Enter the default values as shown above.
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FIGURE 3-9. LOGIN SCREEN
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CHAPTER 1: HEADLINE
CHAPTER 4: MAKING NETWORK CONNECTIONS
4.1 CONNECTING NETWORK DEVICES
The switch is designed to be connected to 10, 100 or 1000Mbps network cards in PCs and servers, as well as to other switches
and hubs. It may also be connected to remote devices using optional SFP transceivers.
4.2 TWISTED-PAIR DEVICES
Each device requires an unshielded twisted-pair (UTP) cable with RJ-45 connectors at both ends. Use Category 5, 5e or 6 cables
for 1000BASE-T connections, Category 5 or better for 100BASE-TX connections.
4.3 CABLING GUIDELINES
The RJ-45 ports on the switch support automatic MDI/MDI-X pinout configuration, so you can use standard straight-through
twisted-pair cables to connect to any other network device (PCs, servers, switches, routers, or hubs).
CAUTION: Do not plug a phone jack connector into an RJ-45 port. This will damage the switch. Use only twisted-pair cables
with RJ-45 connectors that conform to FCC standards.
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4.4 CONNECTING TO PCS, SERVERS, HUBS AND SWITCHES
ST EP 1: Attach one end of a twisted-pair cable segment to the device’s RJ-45 connector.
FIGURE 4-1. TWISTED=PAIR CONNECTION
STEP 2: If the device is a network card and the switch is in the wiring closet, attach the other end of the cable segment to a modular
wall outlet that is connected to the wiring closet. (See Section 4.5, Network Wiring Connections.) Otherwise, attach the other end to
an available port on the switch.
Make sure each twisted-pair cable does not exceed 328 feet (100 meters) in length.
NOTE: Avoid using flow control on a port connected to a hub unless it is actually required to solve a problem. Otherwise, back
pressure jamming signals may degrade overall performance for the segment attached to the hub.
STEP 3: As each connection is made, the Link LED (on the switch) corresponding to each port will light green (1000 Mbps) or amber
(100 Mbps) to indicate that the connection is valid.
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CHAPTER 4: MAKING NETWORK CONNECTIONS
4.5 NETWORK WIRING CONNECTIONS
A punch-down block is an integral part of many of the newer equipment racks. It is actually part of the patch panel. Instructions for
making connections in the wiring closet with this type of equipment follows.
ST EP 1: Attach one end of a patch cable to an available port on the switch, and the other end to the patch panel.
STEP 2: If not already in place, attach one end of a cable segment to the back of the patch panel where the punch-down block
is located, and the other end to a modular wall outlet.
STEP 3: Label the cables to simplify future troubleshooting. See Chapter 5, Cable Labeling and Connection Records.
Equipment rack
Switch
(side view)
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Punchdown block
Patch panel
Wall
FIGURE 4-2. NETWORK WIRING CONNECTIONS
4.6 FIBER OPTIC SFP DEVICES
An optional Gigabit 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. The lasers are inherently eye safe in normal operation.
However, users should never look directly at a transmit port when it is powered on.
WARNING: When selecting a fiber SFP device, considering safety, please make sure that it can function at a temperature that is
not less than the recommended maximum operational temperature of the product. You must also use an approved Laser SFP
transceiver.
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ST EP 1: Remove and keep the LC port’s rubber plug. When not connected to a fiber cable, the rubber plug should be replaced
to protect the optics.
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.
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 in Section 4.8, 1000 Mbps Gigabit Ethernet Collision Domain.
4.7 CONNECTIVITY RULES
When adding hubs to your network, note that because switches break up the path for connected devices into separate collision
domains, you should not include the switch or connected cabling in your calculations for cascade length involving other devices.
4.8 1000BASE-T AND FIBER CABLE REQUIREMENTS
All Category 5 UTP cables that are used for 100BASE-TX connections should also work for 1000BASE-T, providing that all four wire
pairs are connected. However, it is recommended that for all critical connections, or any new cable installations, Category 5e or
Category 6 cable should be used. The Category 5e and 6 specifications include test parameters that are only recommendations
for Category 5. Therefore, the first step in preparing existing Category 5 cabling for running 1000BASE-T is a simple test of the
cable installation to be sure that it complies with the IEEE 802.3-2005 standards. Fiber cable should meet the fiber standards
shown in the following tables.
TABLE 4-1. MAXIMUM 1000BASE-T GIGABIT ETHERNET CABLE LENGTH
CABLE TYPE MAXIMUM CABLE LENGTH CONNECTOR
Category 5, 5e or 6 100-ohm UTP or STP 328 ft. (100 m) RJ-45
TABLE 4-2. MAXIMUM 1000BASE-SX GIGABIT FIBER CABLE LENGTHS
CABLE TYPE FIBER BANDWIDTH MAXIMUM CABLE LENGTH CONNECTOR
62.5/125 micron multimode fiber
50/125 micron multimode fiber
160 MHz/k m
200 MHz/km
400 MHz/km
500 MHz/km
722 ft. (220 m)
902 ft. (275 m)
1641 ft. (500 m)
1805 ft. (550 m)
LC
LC
LC
LC
TABLE 4-3. MAXIMUM 1000BASE-LX/LHX/XD/ZX GIGABIT FIBER CABLE LENGTHS
CABLE TYPE FIBER BANDWIDTH MAXIMUM CABLE LENGTH CONNECTOR
9/125 micron single-mode fiber, 1310 nm N/A 6.2 mi. (10 km) LC
9/125 micron single-mode fiber, 1550 nm N/A
18.64 mi. (30 km)
31.06 mi. (50 km)
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LC
LC
19
CHAPTER 4: MAKING NETWORK CONNECTIONS
TABLE 4-4. MAXIMUM 1000BASE-LX SINGLE FIBER GIGABIT FIBER CABLE LENGTHS
CABLE TYPE FIBER BANDWIDTH MAXIMUM CABLE LENGTH CONNECTOR
Single-mode fiber:
TX: 1310 nm;
RX: 1550 nm
Single-mode fiber:
TX: 1550 nm;
RX: 1310 nm
TABLE 4-5. MAXIMUM FAST ETHERNET CABLE LENGTHS
CABLE TYPE MAXIMUM CABLE LENGTH CONNECTOR
Category 5, 5e or 6 100-ohm UTP or STP 328 ft, (100 m) RJ-45
N/A 12.42 mi. (20 km)
N/A 12.42 mi. (20 km)
BIDI
LC
BIDI
LC
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CHAPTER 5: CABLE LABELING AND CONNECTION RECORDS
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When planning a network installation, it is essential to label the opposing ends of cables and to record where each cable is
connected. This will allow the user to easily locate inter-connected devices, isolate faults and change your topology without need
for unnecessary time consumption.
To best manage the physical implementations of your network, follow these guidelines:
Clearly label the opposing ends of each cable.
Using your building’s floor plans, draw a map of the location of all network-connected equipment. For each piece of equipment,
identify the devices to which it is connected.
Note the length of each cable and the maximum cable length supported by the switch ports.
For ease of understanding, use a location-based key when assigning prefixes to your cable labeling.
Use sequential numbers for cables that originate from the same equipment.
Differentiate between racks by naming accordingly.
Label each separate piece of equipment.
Display a copy of your equipment map, including keys to all abbreviations at each equipment rack.
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CHAPTER 6: TROUBLESHOOTING
BASIC TROUBLESHOOTING TIPS
Most problems are caused by the following situations. Check for these items first when starting your troubleshooting:
Connecting to devices that have a fixed full- duplex configuration.
The RJ-45 ports are configured as “Auto.” That is, when connecting to attach devices, the switch will operate in one of two ways to
determine the link speed and the communication mode (half duplex or full duplex):
- If the connected device is also configured to Auto, the switch will automatically negotiate both link speed and communication
mode.
- If the connected device has a fixed configuration, for example 100 Mbps, at half or full duplex, the switch will automatically sense
the link speed, but will default to a communication mode of half duplex.
Because the switch devices behave in this way (in compliance with the IEEE802.3 standard), if a device connected to the switch
has a fixed configuration at full duplex, the device will not connect correctly to the switch. The result will be high error rates and very
inefficient communications between the switch and the device.
Make sure all devices connected to the switch devices are configured to auto negotiate, or are configured to connect at half duplex
(all hubs are configured this way, for example).
Faulty or loose cables. Look for loose or obviously faulty connections. If they appear to be OK, make sure the connections are snug.
If that does not correct the problem, try a different cable.
Non-standard cables. Non-standard and miswired cables may cause network collisions and other network problems, and can
seriously impair network performance. Use a new correctly-wired cable. For pinouts and correct cable wiring. A category 5 cable
tester is a recommended tool for every 100BASE-TX and 1000BASE-T network installation.
Improper Network Topologies. It is important to make sure you have a valid network topology. If you no longer experience the
problems, the new topology is probably at fault. In addition, you should make sure that your network topology contains no data path
loops.
Check the port configuration.
A port on your Switch may not be operating as you expect because it has been put into a “ blocking” state by Spanning Tree, GVRP
(automatic VLANs), or LACP (automatic trunking). (Note that the normal operation of the Spanning Tree, GVRP, and LACP features
may put the port in a blocking state.) Or, the port just may have been configured as disabled through software.
The following table provides information for users to easily troubleshoot problems by taking actions based on the suggested
solutions.
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SYMPTOM ACTION
Power LED is OFF
Link LED is OFF
22
Check connections between the switch, the power cord and the wall outlet.
Contact Black Box Technical Support at 877-877-2269 or info@blackbox.com
Verify that the switch and attached device are powered on.
Be sure the cable is plugged into the switch and corresponding device.
If the switch is installed in a rack, check the connections to the punch-down block and patch panel.
Verify that the proper cable types is used and its length does not exceed specified limits.
Check the adapter on the attached device and cable connections for possible defects.
Replace the defective adapter or cable if necessary.
TABLE 4-1. TROUBLESHOOTING
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CHAPTER 7: POWER AND COOLING PROBLEMS
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7.1 INSTALLATION
If the power indicator does not turn on when the power cord is plugged in, you may have a problem with the power outlet, power cord,
or internal power supply. If the unit powers off after running for a while, check for loose power connections, power losses or surges at
the power outlet. If you still cannot isolate the problem, the internal power supply may be defective. Verify that all system components
have been properly installed. If one or more components appear to be malfunctioning (such as the power cord or network cabling),
test them in an alternate environment where you are sure that all the other components are functioning properly
7.2 IN-BAND ACCESS
You can access the management agent in the switch from anywhere within the attached network using Telnet, a web browser.
You must first configure the switch with a valid IP address, subnet mask, and default gateway. If you have trouble establishing a link
to the management agent, check to see if you have a valid network connection. Then verify that you entered the correct IP address.
Also, be sure the port through which you are connecting to the switch has not been disabled. If it has not been disabled, then check
the network cabling that runs between your remote location and the switch.
NOTE: The management agent accepts up to four simultaneous Telnet sessions. If the maximum number of sessions already exists,
an additional Telnet connection will not be able to log into the system.
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CHAPTER 8: SPECIFICATIONS
SPECIFICATIONS
Physical Characteristics
Connectors LGB5028A-R2: (24) 10/100/1000 Mbps UTP, (4) 1 G/10Gbps SFP+, (1) DB9M console port;
LGB5052A-R2: (48) 10/100/1000 Mbps UTP, (4) 1 G/10Gbps SFP+, (1) RJ-45 console port
Network Interface LGB5028A-R2:
Ports 1-24: RJ-45 connector, auto MDI/X;
10BASE-T: RJ-45 (100-ohm, UTP cable; Category 3 or better);
100BASE-TX: RJ-45 (100-ohm, UTP cable; Category 5 or better);
1000BASE-T: RJ-45 (100-ohm, UTP or STP cable; Category 5, 5e or 6)
*Maximum Cable Length - 328 ft. (100 m)
Ports 25 to 28: 10G/10G SFP+ ports;
LGB5052A-R2:
Ports 1-48: RJ-45 connector, auto MDI/X;
10BASE-T: RJ-45 (100-ohm, UTP cable; Category 3 or better);
100BASE-TX: RJ-45 (100-ohm, UTP cable; Category 5 or better);
1000BASE-T: RJ-45 (100-ohm, UTP or STP cable; Category 5, 5e or 6)
*Maximum Cable Length - 328 ft. (100 m)
Ports 49 to 52: 10G/10G SFP+ ports
Buffer Architecture 4096 bytes on-chip frame buffer
Aggregate Bandwidth LGB5028A-R2: 128 Gbps;
LGB5052A-R2: 176 Gbps
Switching Database 32K MAC address entries
LEDs System: (1) Power:
Per TP port: (1) Status (Link/Act), (1) 10/100/1000 M;
Per SFP+ port: (1) Status (Link/Act/Speed), (1) 1G/10G
Dimensions 1.7"H x 17.4" x 8.3"D (4.4 x 44.2 x 21.1 cm)
Power Requirements
Power Supply 100 to 240 VAC, 50 to 60 Hz
Environmental
Operating Temperature 32 to 113° F (0 to 45° C)
Operating Humidity 10 to 90%, noncondensing
Switch Features
Flow Control Full duplex: IEEE 802.3x;
Half duplex: Backpressure
Forwarding Mode Store-and-forward
Throughput LGB5028A-R2: 95.232 Mpps;
LGB5052A-R2: 130.95 Mpps
Management Features
In-Band Management SSH/SSL, Telnet, SNMP or HTTP
Out-of-Band Management LGB5028A-R2: DB9M console port (located on the back panel of the switch);
LGB5052A-R2: RJ-45 console port (located on the front panel of the switch to the right of the SFP+ slots)
Software Loading HTTP, TFTP in-band, console out-of-band
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CHAPTER 8: SPECIFICATIONS
SPECIFICATIONS (CONTINUED)
Approvals
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 802.3x => 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 => ink Aggregation Control Protocol (LACP)
IEEE 802.1AB => Link Layer Discovery Protocol (LLDP)
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
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APPENDIX A: REGULATORY INFORMATION
A.1 FCC STATEMENT
This equipment has been found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance
with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate
the equipment.
Shielded cables must be used with this equipment to maintain compliance with radio frequency energy emission regulations and
ensure a suitably high level of immunity to electromagnetic disturbances.
All power supplies are certified to the relevant major international safety standards.
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APPENDIX A: REGULATORY INFORMATION
A.2 NOM 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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APPENDIX B: DISCLAIMER/TRADEMARKS
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B.1 DISCLAIMER
Black Box Corporation shall not be liable for damages of any kind, including, but not limited to, punitive, consequential or cost of cover
damages, resulting from any errors in the product information or specifications set forth in this document and Black Box Corporation
may revise this document at any time without notice.
B.2 TRADEMARKS USED IN THIS MANUAL
Black Box and the Black Box logo type and mark are registered trademarks of Black Box Corporation.
Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.
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