Black Box LGB5028A-R2 User manual

24/7 TECHNICAL SUPPORT AT 1.877.877.2269 OR VISIT BLACKBOX.COM
INSTALLATION & GETTING STARTED GUIDE
GBE
MANAGED
SWITCHES
LGB5028A-R2, LGB5052A-R2
1 3 5 972 4 6 8 10 12 14 18 20 22 24 25 26 27 28
16
11 13 15 17 19 21 2323
SFP/SFP+
System
Link/Act
Speed
Mode
28-PORT GbE MANAGED SWITCH
25 26
135 2
SFP/SFP+
System
Link/Act
Speed
Mode
28-PORT GbE MANAGED SWITCH
4 6 27 28
7 9 10 12 13 15 17 21 2319 14 16 20 22 2418
118

2
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
TABLE OF CONTENTS
SAFETY INFORMATION.................................................................................................................................................................... 4
RELATED PUBLICATIONS................................................................................................................................................................. 5
REVISION HISTORY .......................................................................................................................................................................... 5
1. INTRODUCTION............................................................................................................................................................................. 6
1.1 Over 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

3
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
TABLE OF CONTENTS
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: 192.168.1.1
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.254
Username: admin
Password: <none> (Just press the Enter key.)

41. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
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.
WARNING: EYE HAZARD! The SFP modules are Class 1 laser devices. Do not look direcly at the beam coming from the transmit
port.

5
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
RELATED PUBLICATIONS/REVISION HISTORY
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

6
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
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
10/100/1000
RJ-45 ports
Mode
button
System
LED
Port Status
LEDs
1G/10G
SFP+ ports
Mode
LEDs
FIGURE 1-1. FRONT PANEL OF THE LGB5028A-R2 SWITCH
1.3 REAR VIEW OF THE SWITCH
AC power
socket
Console
port
FIGURE 1-2. BACK PANEL OF THE LGB5028A-R2 SWITCH

7
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
CHAPTER 1: INTRODUCTION
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.

8
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
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
PRODUCT CODE DESCRIPTION
LFP411 SFP, 1250-Mbps Fiber with Extended Diagnostics, 850-nm Multimode, 550 m LC
LFP412 SFP, 1250-Mbps Fiber with Extended Diagnostics, 1310-nm Multimode, 2 km LC
LFP413 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
LFP415 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
LFP401 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
LFP403 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

9
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
CHAPTER 2: HARDWARE DESCRIPTION
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 STATUS
TP Link/Act Green/Blinking Lights Green when TP link is good
Blinks when any traffic is present
TP Speed Green/Yellow Lights Green when TP link is running at 1000 Mbps
Yellow when TP link is running at 10/100 Mbps
SFP Link/Act Green/Blinking Lights ON Green when SFP link is good
Blinks when any traffic is present
SFP Speed Blue/Green 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

10
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
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 [e-mail]
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.
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.

11
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
CHAPTER 3: INSTALLING THE SWITCH
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:
STEP 1: Attach the brackets to the device using the screws provided in the rackmounting kit.
FIGURE 3-1. ATTACH THE MOUNTING BRACKETS

12
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
CHAPTER 3: INSTALLING THE SWITCH
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.
FIGURE 3-2. INSTALL THE SWITCH IN THE RACK
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.

13
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
CHAPTER 3: INSTALLING THE SWITCH
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
LFP412 SFP, 1250-Mbps Fiber with Extended Diagnostics, 1310-nm Multimode, 2 km LC
LFP413 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
LFP415 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
LFP401 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
LFP403 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
To install an SFP in the switch, follow these instructions:
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: SFPs are ordered separately.

14
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
CHAPTER 3: INSTALLING THE SWITCH
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.
Inserting the Power Cord into AC Power Socket
STEP 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

15
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
CHAPTER 3: INSTALLING THE SWITCH
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.
6 9
1 5
FIGURE 3-7. DB9 SERIAL PORT PINOUT FOR LGB5028A-R2
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

16
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
CHAPTER 3: INSTALLING THE SWITCH
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: 192.168.1.1
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 enter. e.g., http://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.
FIGURE 3-9. LOGIN SCREEN

17
CHAPTER 1: HEADLINE
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
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.
4.4 CONNECTING TO PCS, SERVERS, HUBS AND SWITCHES
STEP 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.

18 1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
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.
STEP 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.
Switch
Patch panel
Equipment rack
(side view)
Punchdown block
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.

19
1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
CHAPTER 4: MAKING NETWORK CONNECTIONS
STEP 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 160 MHz/km
200 MHz/km
722 ft. (220 m)
902 ft. (275 m)
LC
LC
50/125 micron multimode fiber 400 MHz/km
500 MHz/km
1641 ft. (500 m)
1805 ft. (550 m)
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)
LC
LC

20 1. 8 7 7. 8 7 7. 2 2 6 9 BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2 269
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
N/A 12.42 mi. (20 km) BIDI
LC
Single-mode fiber:
TX: 1550 nm;
RX: 1310 nm
N/A 12.42 mi. (20 km) BIDI
LC
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