Black Box LB9901A, LB9901A-RJ, LB9901AE-RJ, LB9901A-BNC, LB9901AE-BNC Specifications
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Learns workgroup‘s
network addresses
automatically.
Instantly frees up
network bandwidth.
Filters out unneeded
traffic.
Easy operation and
plug-and-play
installation.
Software-transparent.
Supports server-based
workgroups— from 4
to 256 nodes.
Configurations to
support any standard
Ethernet media and
cabling system.
Choose from RJ-45,
BNC, AUI, and fiber ST
connectors.
G
et your traffic moving with the
Workgroup MiniBridge. It
bridges between the workgroup
and the central network, filtering
out extra central network traffic
that causes congestion.
Ideal for workgroups that have
their own local server but have
become clogged with both heavy
local and network traffic, the
MiniBridge can bridge-isolate the
workgroup and local servers from
the rest of the network, particularly
since traffic is typically between
the workgroup users and their
servers. The result: It instantly frees
up bandwidth for increased
performance, essentially
performing as a two-port switching
hub.
Plug-and-play, this miniature
local bridge learns the network
addresses of the local workgroup
network devices from the packets
in the traffic, so there’s no software
setup required. In fact, because it
operates as a transparent bridge—
forwarding only packets that aren’t
needed on the network segment—
it won’t affect any standard
software applications or SNMP
Workgroup MiniBridge
PWR
12VDC, 1A
Increase workgroup performance by
filtering non-local traffic from your
central network.
Key Features
WORKGROUP MINIBRIDGE
network-management platforms.
And as you add or change
users or servers on the network,
the Workgroup MiniBridge learns
the new network addresses and
adapts automatically.
You can install the Workgroup
MiniBridge in an existing network,
either on a wiring-closet shelf, on
a table-top, or on a wall (brackets
are included). Its compact size
allows it to be installed in virtually
any location that‘s within reach of
a standard AC wall outlet. Its
portable design also makes it easy
for hotspot analysis throughout
your network and deploying in
areas where traffic bottlenecks
suddenly occur.
The Workgroup MiniBridge
is available in a variety of
configurations to accommodate
any combination of standard
Ethernet media. It contains one
repeater port module (RPM) and
one bridge port module (BPM), both
of which are enclosed at opposite
ends of the MiniBridge’s compact
yet rugged metal enclosure.
The RPM, which connects to
the upstream network, behaves
as a repeater port and relays all
packets in both directions. The
BPM, which connects to the
workgroup segment, gives the
Workgroup MiniBridge its bridge
functionality by making a
filter/forward decision on each
packet based on the contents of
its address table. Each BPM is
equipped with a media interface
connector.
The following preconfigured
models are available:
• Workgroup MiniBridge RJ-45
(LB9901A-RJ and LB9901AERJ), which contains one RJ45 BPM and one RJ-45 RPM.
• Workgroup MiniBridge BNC
(LB9901A-BNC and
LB9901AE-BNC), with a BNC
BPM and a BNC RPM.
• Workgroup MiniBridge AUI
(LB9901A-AUI and LB9901AEAUI), which contains one AUI
BPM and one AUI RPM.
• Workgroup MiniBridge
TP/Fiber (LB9901A-TST and
LB9901AE-TST), with one RJ45 RPM and one fiber ST
BPM.
• Workgroup MiniBridge
AUI/Fiber (LB9901A-AST
Black Box Corporation • 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Support: 724-746-5500 • www.blackbox.com • e-mail: info@blackbox.com
© 2003. All rights reserved.
Black Box Corporation.
12/15/2003 #13882
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and LB9901AE-AST), which
contains one AUI RPM and
one fiber ST
®
BPM.
The chassis also houses the
main circuit board, which is used
to power the modules and serves
as a connection plane between the
BPM and RPM cards. The top side
of the chassis has one DC power
jack for the included external
power supply, and one green
power (PWR) LED, which lights
when DC power is present.
Repeater port modules available:
The RJ-45 RPM card (on the
LB9901A-RJ, LB9901AE-RJ,
LB9901A-TST, and LB9901AE-TST)
supports Ethernet twisted-pair
segments of any standard length.
It has a single RJ-45 connector,
which is shielded to minimize
emissions and to accept either
unshielded twisted-pair (UTP)
or shielded twisted-pair (STP)
segment connections.
The RJ-45 RPM also has a
slide switch for cascaded or uplink
connections, so you won’t need a
special crossover cable.
Use this RPM in 10BASE-T UTP
environments with maximum segment distances up to 100 meters
(328 ft.) or STP environments with
distances up to 150 meters
(492.1 ft.). The RPM also contains
an internal transceiver.
The BNC RPM (included with
LB9901A-BNC and LB9901AE-BNC)
features a standard 10BASE2
coax connector for ThinNet BNC
connections. You can terminate a
link that the BNC RPM is connected
to by simply flipping its internal slide
switch—there’s no need for a 50ohm terminator or a“T” connector
(unless your application specifically
requires one).
The BNC RPM includes one
partition (PART) LED and one
receive (RX) LED. PART flashes
amber when the segment is
automatically partitioned. As soon
as normal transmission resumes,
the segment is reestablished
automatically. RX lights green
when data is received.
The AUI RPM (found on our
LB9901A-AUI, LB9901AE-AUI,
LB9901A-AST and LB9901AE-AST)
enables connections to a 10BASE5
(Thicknet) backbone or to any AUI
segment, functions as an IEEE 802.3
repeater, and has a DB15 AUI
female connector and a slide-lock.
It’s also a “universal” Ethernet
media interface, because you can
use it with a variety of minitransceivers to connect to any
media type. Use the module, for
instance, to connect Ethernet
devices using standard AUI
cabling.
For diagnostic purposes, the
AUI RPM has partition (PART) and
receive (RX) LEDs that function the
same as the LEDs on the BNC RPM.
Bridge port modules available:
The RJ-45 BPM (included on
the LB9901A-RJ and LB9901AE-RJ)
has a single RJ-45 connector and
supports Ethernet twisted-pair
segments of any standard length.
As with the RJ-45 RPM, the RJ-45
BPM’s RJ-45 connector is shielded
to minimize emissions and connects to 10BASE-T UTP segments
up to 100 meters (328 ft.) long.
For flexible cabling, the RJ-45
BPM features a MDI-X slide switch
for cascading, so you won’t need
a special twisted-pair crossover
cable—straight-pinning will do.
This module also has an
internal transceiver and three LEDs:
FWD-I, FWD-X, and LINK. FWD-I
blinks green when packets are
being forwarded into the local
segment. FWD-X blinks green
when packets are being forwarded
out of the MiniBridge to the
upstream network. LINK lights
green to indicate an operational
segment link.
Our BNC BPM (on the LB9901A-
BNC and LB9901AE-BNC models)
features a standard 10BASE2 coax
connector for ThinNet BNC
connections. This self-learning
BPM filters and forwards packets
at full Ethernet wire speed and is
designed to isolate the local
segment (the users and devices
connected to the Workgroup
MiniBridge unit housing the BPM)
from the connecting network (the
users and devices connected
through the BPM’s media
connector).
And because the BNC BPM
has a special switch-selectable
internal termination function, you
won’t need a “T” connector and
a 50-ohm terminator.
The module includes a FWD-I
LED, which blinks green to indicate
when it’s forwarding packets into
the Workgroup MiniBridge’s local
segment, as well as a FWD-X LED,
which blinks green when the
MiniBridge forwards packets to
the upstream network.
The AUI BPM (mounted in the
LB9901A-AUI and LB9901AE-AUI
models) has a DB15 AUI female
connector and a slide-lock, and
provides bridge isolation from a
10BASE5 (Thicknet) backbone or
any AUI segments. Self-learning,
it filters and forwards packets at
full Ethernet wire speed.
With its “universal” Ethernet
media interface, the AUI BPM can
be used with a variety of different
mini-transceivers to provide
connection to any media type (in
particular, you’ll need to use a
transceiver when using the
Workgroup MiniBridge to connect
to a Thicknet segment).
For easy monitoring of activity,
the module has one FWD-I LED
and one FWD-X LED. These
operate the same as the LEDs on
the BNC BPM.
We also offer a BPM for fiber
connections: the Fiber ST BPM
(LB9901A-TST, LB9901AE-TST,
LB9901A-AST, and LB9901AE-AST).
This multimode fiber optic local
bridge module has a dual ST type
connectors. When used for
10BASE-FL segments, it supports
fiber transmission distances up to
2 km (1.2 mi.). For FOIRL, it supports
fiber segments of up to 1 km
(0.6 mi.).
The self-learning BPM filters
and forwards packets at full
Ethernet wire speed and features a
built-in transceiver, eliminating the
need for an external transceiver.
It has three status LEDs: The
FWD-I LED blinks green when
packets are being forwarded into
the connected local segment; the
FWD-X blinks green when packets
are being forwarded out of the
module to the upstream network;
the LINK LED lights green to
indicate an operational segment
link.
Central
Network
Workgroup
MiniBridge
Server-based
Workgroup
This configuration is typical of
departmental workgroups. Although
it’s fairly self-sufficient, it has been
slowed down by unnecessary traffic
from the rest of the network. By simply
placing a Workgroup MiniBridge in the
workgroup’s uplink connection, local
traffic is reduced, and workgroup
bandwidth is increased.
Bridge
isolation of a
cascaded
workgroup
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