Black Box LE2750A Manuale utente
CUSTOMER
SUPPORT
INFORMATION
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
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Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
LE2750A
Networking Hub
8-Port, 10BASE-T
1
FCC AND IC RFI STATEMENTS
FEDERAL COMMUNICATIONS COMMISSION
and INDUSTRY CANADA
RADIO FREQUENCY INTERFERENCE STATEMENTS
Class B Digital Device. This equipment has been tested and found to comply with
the limits for a Class B computing device pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful
interference in a residential installation. However, there is no guarantee that
interference will not occur in a particular installation. This equipment generates,
uses, and can radiate radio frequency energy, and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications. If this equipment does cause harmful interference to radio or
telephone reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
• Consult an experienced radio/TV technician for help.
Caution
Changes or modifications not expressly approved by the party
responsible for compliance could void the user’s authority to operate
the equipment.
To meet FCC requirements, shielded cables and power cords are required to
connect this device to a personal computer or other Class B certified device.
This digital apparatus does not exceed the Class B 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 classe B prescrites dans le Règlement sur le brouillage
radioélectrique publié par Industrie Canada.
2
NETWORKING HUB
NORMAS OFICIALES MEXICANAS (NOM)
ELECTRICAL SAFETY STATEMENT
INSTRUCCIONES DE SEGURIDAD
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.
3
NOM STATEMENT
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.
4
NETWORKING HUB
TRADEMARKS
UL®is a registered trademark of Underwriters Laboratories Incorporated.
Any other trademarks mentioned in this manual are acknowledged to be the property of the
trademark owners.
5
CONTENTS
Contents
Chapter Page
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Before You Install: Inspect the Complete Package. . . . . . . . . . . . . . . . 10
3.2 The Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.1 Positioning the Networking Hub on a Table or Shelf . . . . . . . . 10
3.2.2 Powering Up the Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.3 Connecting Twisted-Pair Segments to the Front-Panel Ports . . 11
3.3 Cascading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Operating Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5. Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Things to Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Calling Black Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6
NETWORKING HUB
1. Specifications
Compliance: FCC Class B, IC Class, VDE Class B, UL®listed
Standard: IEEE 802.3 Ethernet v. 1.0/2.0
LAN Interface: RJ-45 ports for Category 3 or better twisted-pair cable
Data Rate: 10 Mbps
Partitioning: Automatic after 32 consecutive collisions
Reconnection: Occurs after 512 bits of error-free transmission
Maximum Segment Length: UTP (unshielded 10BASE-T): 100 m (328 ft.)
Indicators: (17) Front-mounted recessed LEDs: (1) Power, (8) Link/TX, and
(8) RX
Connectors: (8) Front-mounted shielded-type RJ-45 female
Leads/Signals Supported: RJ-45 Pins 1, 2, 3, and 6
Enclosure: High-strength sheet metal
Cooling Method: Convection
Temperature Tolerance: Operating: 32 to 122°F (0 to 50°C); Storage: -4 to +140°F
(-20 to +60°C)
Humidity: 10 to 95% noncondensing
Power: From wallmount power supply: Input: 120 VAC, 60 Hz; Output: 12 VDC,
1 amp; Power consumption: 6 watts typical, 10 watts maximum
Size: 0.8"H x 5"W x 4.4"D (2 x 12.7 x 11.2 cm)
Weight: Unit plus power supply: 1.3 lb. (0.6 kg)
7
2. Introduction
2.1 Overview
The Networking Hub installs easily for use in a home, office, or lab environment,
requiring no special rack cabinets or wiring-closet apparatus. This compact,
standard physical-layer Ethernet hub operates independently of all software.
Simple and inexpensive to use, the Hub is ideal for networking a multi-system
home or office using 10BASE-T twisted-pair cabling. The front panel has eight
shielded twisted-pair ports, and the back panel has a 120-VAC power supply outlet.
Perfect for small-to-medium-size home, office, or lab environments (two to eight
users), the Hub helps you build an independent Ethernet network. It operates as a
self-sufficient unit to provide 10BASE-T Ethernet connectivity for local users and
devices. You can easily expand small, independent networks by cascading hubs.
Expand your network for demonstrations or presentations over the network. Or
insert this handy piece of 10-Mbps Ethernet test equipment into the network to
provide a test port, and then remove it after you’re finished testing. It takes up
minimal space and uses minimal power, plus it’s rugged enough to be carried in a
coat pocket for emergencies.
Whether you place it on a table or mount it on a shelf, the hub fits easily into the
home environment. All of the wiring connectors are in the same plane so that
wiring space is neat and minimal. The external power supply conveniently plugs
into any available AC wall receptacle or power strip.
Eight RJ-45 ports support connection of up to eight workstations or other network
devices over full-length 10BASE-T cable segments. The hub fully complies with the
IEEE 802.3 specification for repeater functionality by performing signal
amplification, re-timing data packets, and re-generating preamble bits for each
packet received. Detecting collisions, extending collision fragments, and
automatically partitioning and reconnecting individual ports keep problems on
one LAN segment from causing downtime elsewhere on the network.
CHAPTER 2: Introduction
8
NETWORKING HUB
The front panel has Link/TX and RX LEDs for each RJ-45 port, numbered for the
corresponding ports (see Figure 2-1), and one LED for AC power. Observing the
operation and status of the ports is easy.
Figure 2-1. Front panel.
The included external wallmount power supply uses AC input power of
120 VAC/60 Hz. Its lightweight cord carries DC power to the barrel-type power
jack on the rear panel (shown in Figure 2-2).
Figure 2-2. Rear panel.
2.2 Features and Benefits
• Interoperability with other Ethernet devices: The Networking Hub is
interoperable with other Ethernet-compliant network devices. Each is fully
compliant with IEEE 802.3 specifications for 10-Mbps CSMA/CD operation.
This allows the hub to be integrated into any standard 10-Mbps Ethernet
network.
• Installation versatility: The hub’s small size makes it very unobtrusive, so it fits
easily into almost any home, office, or lab location.
• Robust network operation: The hub uses the “star” network topology and has
automatic per-port partitioning and reconnection. A fault on one segment is
isolated from the rest of the network, avoiding most network downtime.
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