Black Box Stackable MiniHub Le2801a User manual

Stack five units to
support up to 40 users.
Includes eight
shielded RJ-45
connectors and one
AUI connector.
Optional NC or
fiberoptic connectors
available.
Offers full 10 ASE-T
functionality with an
exceptionally small
footprint.
LEDs show basic
network activity.
Durable steel
enclosure and
compact size.
T
he Stackable MiniHub is a
compact, unmanaged hub
offering low-cost connectivity for
IEEE 02.3/Ethernet 10BASE-T
networks. Each hub has eight
shielded modular jack ports and
one AUI port. A BNC or Fiber port
is optional in addition to the AUI.
Up to five hubs can be stacked
to form a single logical repeater
with 40 modular jack ports and
four AUI, BNC, or Fiber ports. This
feature allows you to build larger
networks without violating IEEE
02.3 guidelines.
Port , on the front of the
MiniHub, has an uplink switch for
internal crossing over of the
10BASE-T port. This allows you to
Stackable MiniHub
Ports 12345678
Stack Enable
LINK TX
8
7
6
5
4
3
2
1
PORTS
PWR
COL
POL TX
UP LINK
Off
IRB1 IRB2 On
PWR
12VDC, 1A
Build a 40-user network anywhere—or add up
to 40 users to your existing network.
KeyFeatures
STACKABLEMINIHUB
connect to other hubs without
using a crossover cable.
It may be tiny, but the
Stackable MiniHub has
everything you expect in a
10BASE-T hub. Featuring full
repeater functionality, the
MiniHub also offers jabber
protection to prevent lockup from
excessively long packets,
automatic partitioning and
reconnection of ports
experiencing excessive collisions,
and automatic polarity detection
that compensates for wiring
errors on the receive pair.
To aid operation,
troubleshooting, and diagnostics,
the MiniHub has 20 front-panel
LEDs that display hub status and
link activity.
Typical Applications include:
• Networking a personal
multi-system office using
10BASE-T twisted-pair
cabling
• Temporary network for trade
shows
• Lab or office environments
that need an independent
Ethernet network
• Expanding small
independent networks
• Testing your network—use
the MiniHub as a test port
Black Box Corporation • 1000 Park Drive • Lawrence, PA 15055-101 • Tech Support: 724-746-5500 • www.blackbox.com • e-mail: [email protected]
© 2002. All rights reserved.
Black Box Corporation.
4/11/2002 #13071

• (1) Stackable MiniHub
• (1) External 120-VAC, 60-Hz
power supply
• (1) Velcro tape section,
approximately 3 inches
(7.6 cm) in length
• (2) Brackets for optional
wall-mounting
• (1) User’s manual
• (1) Stacking cable
Standards — All: 10BASE-T;
LE2 01A: 10BASE5;
LE2 01A-BNC: 10BASE2;
LE2 01-FO: 10BASE-FL
Data Rate — 10 Mbps
Diagnostics — Via LEDs or network
software
Indicators — (1 ) Front-mounted
recessed LEDs:
(1) Power; ( ) Link/TX
(1 for each port);
( ) Pol/RX (1 for each port)
Leads/Signals Supported — Pins 1,
2, 3, and 6
Partitioning — Automatic after 32
consecutive collisions
Reconnection — Occurs after 512
bits of error-free transmission
Maximum Segment Length —
UTP: 32 ft. (100 m);
STP: 492 ft. (150 m);
AUI drop cable: 164 ft. (50 m);
BNC: 607 ft. (1 5 m);
10BASE5: 1640 ft. (500 m);
10BASE-FL multi-mode
fiberoptic: 6562 ft. (2 km)
Connectors — All: ( ) shielded
RJ-45, (1) DB15 female,
(2) stacking bus headers;
LE2 01A-BNC: (1) BNC;
LE2 01A-FO: (2) Fiber ST
User Controls — Rear-mounted
slide switch for straight-
through versus crossover
(uplink) operation on port ;
Stackable switch to specify
which hub is at the base of
the stack
Enclosure — High-strength steel
Cooling Method — Convection
MT F — 50,000 hours
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: 95–125 VAC, 60 Hz;
Output: 12 VDC, 1 amp;
Consumption: 10 watts maximum
Size — 1"H x 6. "W x 4"D
(2.5 x 17.2 x 10.1 cm)
Weight — 1.3 lb. (0.6 kg);
With power supply: 2.3 lb. (1 kg)
TheCompletePackage
OperatingFeatures
Specifications
Ordering Information
ITE CODE
Stackable MiniHub ....................................................LE2 01A
Stackable MiniHub-BNC ...............................LE2 01A-BNC
Stackable MiniHub-Fiber ..................................LE2 01A-FO
Stackable MiniHubs perform
signal amplification, retiming of
data packets, and regeneration of
preamble bits for each packet
received. They also detect
collisions, extend collision
fragments, and automatically
partition and reconnect individual
ports. This section describes a
few of these features in greater
detail.
Preamble Regeneration
As per Ethernet standards,
the MiniHubs add bits to the
preambles of output packets so
that each output packet contains
a minimum 64-bit preamble.
Collision Condition
When carrier is detected
simultaneously on multiple ports,
a jam pattern is generated on
each port to create a collision
condition. When a collision signal
from one port is detected, it
generates a jam pattern to other
ports.
Partitioning and Reconnection
Stackable MiniHubs will
automatically partition any port
where 32 consecutive collisions
occur or after 6.5 ms of
continuous transmissions.
Network integrity is checked
every 00 ms, and the segment is
reconnected after one 512-bit
packet is transmitted without an
error.
Fragment Extension
The Stackable MiniHubs will
automatically add bits to a
received data packet of less than
96 bits (a ”fragment”) so that the
size of the packet sent on toward
its destination is at least 96 bits.