Black Box LB0010A-U24-R2, LB0010A-U35-R2, LB0010A-U36-R2, LB0010A-U53-R2, LB0010A-U21-R2 Specifications

Bridge network traffic in legacy 10BASE-T networks.

Bridge network traffic in legacy 10BASE-T networks.

Remote MiniBridge

© 2007. All rights reserved. Black Box Corporation.

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FEATURES

• Pairs of compact units bridge
Ethernet LANs.

• Data rates to 20 Mbps on LAN side,
10 Mbps sync or 115.2 kbps async
on WAN side.

• Filters and forwards nearly 15,000
packets per second, and automatically
updates its table of as many as 10,000
MAC addresses.

• Bridges 10BASE-T LAN to a choice
of several WAN interfaces.

• Features an autosensing power supply.

You can often plug the compact Remote MiniBridge right into a device.

OVERVIEW

The Remote MiniBridge is a self-learning Ethernet bridge
that works well for connecting legacy networks over WAN
interfaces such as

RS-232 and V.35.

It automatically learns MAC addresses on the LAN to which
it is connected and only forwards frames destined for another
LAN. Its LAN table stores up to 10,000 addresses and is auto­matically updated.

The MiniBridge performs filtering and forwarding at 14,880
pps (packets per second), just shy of the maximum theoretical
“wire-speed” rate of 15,000 pps. Its buffer can hold 256 frames
with a throughput latency of 1 frame. Or, you can disable
filtering for extender or segmenter applications.

The Remote MiniBridge units are available with a 10BASE-T
UTP interface. They operate in full duplex mode at 20 Mbps.

On the WAN side, the MiniBridge comes with several
different interfaces: RS-232 (V.24), RS-422 (V.36), RS-530, V.35,
or X.21. The MiniBridge can send and receive data synchronously
across any of these interfaces at up to 10 Mbps. It can also
communicate asynchronously across these interfaces at any of
seven standard frequencies up to 115.2 kbps—or even at other
custom frequencies derived from a high-speed external-clock
signal. However, be aware that async operation requires
grounding certain pins on the WAN connector and is technically
challenging. For all its WAN communication, the MiniBridge uses
a variant of HDLC framing in accordance with RFC 1662.

You can also enable or disable “enhanced compression,”
a throughput-enhancing feature in which the MiniBridge
strips the padding bits from 64-byte frames.

All models feature an autosensing desktop power supply,
so your MiniBridges are safe working with 115-VAC/60-Hz or
230-VAC/50-Hz lines. That versatility means these units can
work anywhere in the world you have a network.

4/25/07
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10BASE-T hub Ethernet switch

Up to 10 Mbps

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MiniBridge

Sync modemSync modem

TYPICAL APPLICATION

Connect a legacy 10BASE-T network to the rest of
your campus Ethernet network with a pair of V.35
Remote MiniBridges, a pair of CSU/DSUs, and a high-speed
dedicated line.