Black Box LB8422A-US User manual

June, 2006
Express
Ethernet Switch:
LB8422A-US
LB8421A-US
LB8424A-US
CUSTOMER
SUPPORT
INFORMATION
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
724-746-0746
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]

Express Ethernet Switch: LB8422A-US, LB8421A-US, LB8424A-US
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Table of Contents
Table of Contents........................................... １
Packing List.................................................... ２
FCC Statement ............................................... ２
Introduction.................................................... ３
Product Features ....................................................... ３
Front Panel ................................................................ ３
LEDs.......................................................................... ３
Installation...................................................... ４
Selecting a Site for the Switch................................... ４
Connecting to Your Network...................................... ５
Specifications................................................. ５

Express Ethernet Switch: LB8322A-US, LB8421A-US, LB8424A-US
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Packing List
Please inspect the contents and report any apparent damage or missing items
immediately to our authorized reseller.
•The switch
•User’s Manual
•AC to DC power Adapter
FCC Statement
The FCC (Federal Communications Commission) restricts the amount of radio
frequency emission and radiation coming from computer equipment. The Ethernet
switch stated in this manual has been tested and 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 is required to correct the interference at
his/her own expense. Any changes or modifications not expressly approved by the
manufacture would void the user’s authority to operate the equipment.

Express Ethernet Switch: LB8422A-US, LB8421A-US, LB8424A-US
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Introduction
The switch is a 6-port or 8-port Ethernet switch, integrating 10/100BaseTX
(100BaseFX) networks in a cost-effective pocket size package. The TX ports can
auto sense speed and half/full duplex modes and auto-MDIX.
Product Features
•4-port or 6-port for 10/100BaseTX.
•2-port for 100BaseFX.
•The TX ports auto negotiate for 10/100Mbps speed, auto detect full/half
duplex mode, and auto-MDIX.
•Choices of SC, ST, MT-RJ, VF-45, or LC connectors for multi-mode 100FX
ports.
•SC connectors for single-mode 100FX ports.
•Broadcast storming filter function.
•True non-blocking architecture.
•Full wire-speed forwarding rate.
•Store-and-forward mechanism.
•Back pressure and IEEE802.3x compliant flow control.
•Supports 2K MAC addresses.
•Supports 1M bits buffer memory.
•Front panel power and port status LEDs.
•Wall-mountable pocket size.
Front Panel
The front panel of the switch has an array of LED indicators to provide you with
instant feedback on the status of the switch.
LEDs
The array of LED indicators on the front panel conveys status and configuration
information to help you monitor and troubleshoot the switch.
nPower This LED comes on when the switch is connected to the power
adapter.
oPort Status Each port has a LED, indicating the port status.

Express Ethernet Switch: LB8322A-US, LB8421A-US, LB8424A-US
４
pPower Adapter Connect the supplied AC to DC adapter to the receptacle
on the back of the switch, then plug the cord into a standard AC outlet with a
voltage range from 100 to 240 VAC.
Table 1: Port Status
LED State Indication
Steady The port has established a valid network connection.
LNK stands for LINK.
LNK/
ACT Flashing The port is transmitting or receiving data.
ACT stands for ACTIVITY.
Installation
Selecting a Site for the Switch
As with any electronic device, you should place the switch where it will not be
subject to extreme temperatures, humidity, or electromagnetic interference.
Specifically, the site you select should meet the following requirements:
•The ambient temperature should be between 32 and 104 degrees Fahrenheit (0 to
40 degrees Celsius).
•The relative humidity should be less than 90 percent, non-condensing.
•Surrounding electrical devices should not exceed the electromagnetic field (RFC)
standards for IEC 801-3, Level 2 (3V/M) field strength.
•Make sure that the switch receives adequate ventilation. Do not block the
ventilation holes on the side of the switch or the fan exhaust port on the rear of the
switch.
•The power outlet should be within 1.8meter (6 feet) of the switch.

Express Ethernet Switch: LB8422A-US, LB8421A-US, LB8424A-US
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Connecting to Your Network
Connect network cables from computers or network segments to the TX (FX) ports
on the back of the unit.
Table 2: Cabling Information
Speed Connector Port Speed
Half/Full Duplex Cable
100BaseTX RJ-45 100/200 Mbps 100 m, Category 5 STP/UTP
10BaseT RJ-45 10/20 Mbps 100 m, Category 3, 4, or 5
STP/UTP
100BaseFX
Multi-mode
SC, ST, MT-
RJ, VF-45, or
LC
200 Mbps Up to 2km, 50 or 62.5/125µm
Multi-mode fiber cable
100BaseFX
Single-mode SC 200 Mbps Up to 75km, 9 or 10/125µm
Single-mode fiber cable
Specifications
Applicable Standards IEEE 802.3, 10BaseT,
IEEE 802.3u, 100BaseTX/FX
LED Indicators Per unit – Power Status
Per Port – LNK/ACT
Cable 10BaseT 2-pair UTP/STP Cat. 3,4,5, up to 100m
100BaseTX 2-pair UTP/STP Cat.5, up to 100m
100BaseFX 50 or 62.5/125µm Multi-mode fiber optic cable,
up to 2km
100BaseFX 9 or 10/125µm Single-mode fiber optic cable,
up to 75km
Switching Methods Store-and-Forward
Forwarding Rate 14,880pps for 10Mbps,
148,800pps for 100Mbps
AC Input 100~240VAC, 50-60Hz, external Universal power supply
Power consumption 12VDC, 0.6A, 7.2W
Operating Temperature 0°C~40°C (32°F~104°F)
Storage Temperature -25°C~70°C (-13F°~158°F)
Humidity 10%~90%, non-condensing
Emissions FCC part 15 ClassA, CE Mark
Dimensions W160 x D81 x H28mm pocket size
Weight 0.42kg (0.92lb.)