Black Box lb9901a Guia De Especificaciones

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 seg-
ment 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 50-
ohm 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 mini-
transceivers 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 con-
nects 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.