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
#17817

724-746-5500 blackbox.com

10BASE-T hub Ethernet switch

Up to 10 Mbps

Remote

MiniBridge

Remote

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.

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TECH SPECS

Buffer Size — 256 frames
Clock Source — WAN: External only
Compliance — CE, FCC Part 15 Subpart B Class A, DOC Class/MDC classe A
Data Format — WAN: HDLC-like frames (in async mode, these are broken into

8-data-bit octets which are preceded by a start bit and followed by a stop bit)

Data Rate — LAN: Full duplex: 20 Mbps;

Half-duplex: 10 Mbps;

WAN: Synchronous: Up to 10 Mbps;

Asynchronous (all except fiber optic models): 115.2, 57.6,

38.4, 28.8, 19.2, 14.4, or 9.6 kbps (user-selectable)

Distance (Maximum) — LAN: 100 m (328 ft.) to attached device;

WAN: Standard maximum distance for given interface

Filtering and Forwarding — 14,880 packets (frames) per second
Flow Control — None
LAN Table — 10,000 MAC addresses with five-minute automatic aging (updating)
MTBF — 506,000 hours
Operation — LAN: Half- or full duplex
Protocols — WAN: Synchronous or asynchronous, embedded in RFC 1662 variant

of HDLC framing

Standards — LAN: IEEE 802.3 Ethernet v.2
Throughput Delay — 1 frame
User Control — (1) Top-mounted 4-position DIP switch for full vs. half-duplex;

filtering; compression; sync/async

Interfaces — LAN: 10BASE-T;

WAN: LB0010A-U24-R2: TIA RS-232/ITU-TSS V.24/V.28, DTE;

LB0010A-U35-R2: ITU-TSS V.35;
LB0010A-U36-R2: TIA RS-422/ITU-TSS V.36;
LB0010A-U53-R2: TIA RS-530;
LB0010A-U21-R2: ITU-TSS X.21

Connectors — LAN: (1) Shielded RJ-45;

WAN: LB0010A-U24-R2, LB0010A-U53-R2: (1) DB25 F;

LB0010A-U35-R2: (1) DB25 F, proprietarily pinned for V.35 (patch cable

to M/34 included);

LB0010A-U36-R2: (1) DB25 F, pinned for TIA RS-422 (patch cable

to DB37 included);

LB0010A-U21-R2: (1) DB25 F, pinned for TIA RS-530 (patch cable

to DB15 included)

Indicators — (4) Top-mounted LEDs:

WAN (lights in response to WAN data activity);
LAN (lights yellow in response to LAN data activity; lights green

to show link integrity);
COLL (lights in response to LAN collision);
PWR (lights while unit is powered)

Temperature Tolerance — 32 to 122˚F (0 to 50˚C)
Humidity Tolerance — Up to 90%, noncondensing
Power — From autosensing desktop power supply:

Input: 100–250 VAC, 50–60 Hz;
Output: 12 VDC, at least 400 mA;
Consumption: Fiber optic model: 300 mA (3.6 watts) typical, 400 mA

(4.8 watts) maximum;

All other models: 200 mA (2.4 watts) typical, 400 mA (4.8 watts)

maximum

CAUTION: Although the Remote MiniBridge can operate on any
regulated 12-VDC power supply that provides at least 400 mA
of current, using a different power supply than the one the unit
comes with will void CE compliance for the fiber optic models.

Size — 0.7"H x 2.1"W x 2.7"D (1.8 x 5.3 x 6.9 cm)
Weight — 0.1 lb. (<0.1 kg)

4/25/07
#17817

YOU MAY ALSO NEED

• 10BASE-T cable.

• WAN interface cable.

• Ethernet hubs, switches,
repeaters, etc.

• Data testers.

• WAN driver devices such as
modems, CSU/DSUs, FRADs,
or ISDN terminal adapters.

• Power- and data-line surge
protectors.

724-746-5500 blackbox.com

✦

Remote MiniBridge.

(NOTE: The Remote MiniBridge must be used in pairs.)

✦

Autosensing power supply.

✦

Users’ manual.

✦

V.35, RS-422 (V.36), and X.21 models: Adapter cables
that patch the MiniBridge’s DB25 WAN connector to
the interface’s native connector.

WHAT‘S INCLUDED

Item Code

10BASE-T UTP Remote MiniBridge

RS-232 LB0010A-U24-R2
V.35 LB0010A-U35-R2
RS-422 LB0010A-U36-R2
RS-530 LB0010A-U53-R2
X.21 LB0010A-U21-R2

You may also want to order…

Ethernet Transceiver Office Cable,

PVC, 10-ft. (3-m) LCN210-0010

Terminated Duplex Fiber Optic Cable,

PVC, ST-ST, 1-m (3.2-ft.) EFN062-001M-CC

LB0010A-U24-R2