The document describes LANNET's high density Ethernet modules - the LE-180XT, LE-280XT, and LE-240XTC. The modules offer cost-effective connectivity for Ethernet networks, with flexible configuration options. Key features include support for various cabling standards, fault-tolerant operation, and manageability.

1. LE-180XT
LE-280XT
LE-240XTC
MODULAR MULTI-MEDIA NETWORKING
FEATURES
n Cost Effective
The capability of configuring up to 432 Ethernet
links in a single Multinet™ chassis gives you cost
effective precision and saves on your hub
investment
n Universal Standard-Based Connectivity
Support for STP/UTP cabling and RJ45/TELCO
connections meets a wide range of infrastructure
and topology requirements
n Flexible Configuration
Modules can connect to any one of the four
Ethernet segments available in the hub. Each
module can also operate in standalone mode as
a multiport repeater on an independent segment
n Fault Tolerant Operation
Redundancy at both bus and port levels with
automatic switchover that protects critical
connections in case of failure
n Manageable
Modules are manageable under MultiMan™,
LANNET's family of powerful, easy-to-use,
SNMP-based management applications
HIGH DENSITY 10BASE-T ETHERNET
MODULES
LANNET's innovative family of advanced high
density Ethernet modules offer rich features at an
affordable price. Flexible options for network design
let you select the number of ports and connector
types that best suit your network topology
requirements:
l The LE-180XT is equipped with 12 RJ-45 ports
l The LE-280XT is equipped with 24 RJ-45 ports
l The LE-240XTC connects 24 users via two
TELCO connectors.

2. DESCRIPTION
The LANNET family of high-density Ethernet
modules and MultiNet enterprise hubs provides a
cost-effective solution to network segment
design.These Ethernet modules plug directly into
the hubs offering flexible connectivity for meeting
diverse wiring and network needs.
The 24 port LE-280XT and LE-240XTC increase the
capacity of the MultiNet hubs allowing for any
combination of shielded and unshielded twisted pair
cabling.The LE-280XT has shielded RJ-45 ports and
occupies two slots in the hub.The LE-240XTC has two
TELCO connectors and occupies one slot in the hub.
The LE-180XT features port granularity in 12 shielded
RJ-45 ports and occupies one slot in the hub. For
example, an LE-180XT can be combined with two
24 port modules for a segment of 60 ports, thereby
saving cost by using hub space more efficiently. Port
usage is maximized with fewer idle or wasted ports.
In addition to supporting IEEE 802.3 10BASE-T
repeaters, each port may also be employed for
direct hub to hub connections. Both modules use
standard UTP/STP cabling and individual link
lengths may extend to 160m (525 ft). Used together
with LANNET fiber-optic modules, network
diameters of over 4 km (2.5 miles) can be achieved.
Flexible bus selection lets you distribute Ethernet
stations over four independent LAN segments,
allowing for the most efficient use of the hub's
resources.
LET-36
LE-240XTC
Redundant Inter-Hub Link
APDC corrects polarity errors
caused by cross-wiring
LET-36
Indepen
segmen
in Stand
Mana
Main Inter-Hub Link
Mgmt. Agent
LE-180XT
x
An LE-180XT combined with two LE-280XTs
demonstrates efficient segment design while
maximizing port usage for 60 ports, (the modules
are placed adjacently for convenience only).
APPLICATION EXAMPLE

3. ndent Ethernet
nt on a LE-280XT
dalone mode
agement Agent
FAULT TOLERANCE
Bus Redundancy
Each module can be attached to any one of the
four Ethernet buses on the backplane of the
MultiNet hub with a separate bus assigned as a
backup. If the primary bus fails, the module
automatically and instantaneously toggles to the
alternate bus to preserve network integrity.
Port Redundancy
For fault tolerant network design, ports 1 and 2 can
be configured as redundant to each other. Link
communication automatically switches to the
standby port if the active link fails, providing
failsafe communications. Switchover is performed
instantaneously and is transparent to the user.
Auto Polarity Detection and Correction
(APDC)
LANNET's high density Ethernet modules
automatically correct the polarity of received data
caused by crossed-wiring errors. When the
10BASE-T port senses that the signal of a received
packet is reversed, it automatically corrects the
polarity.
Powerful Diagnostic Capabilities
All modules have built in diagnostic capabilities.
Front-panel LEDs indicate normal link operation,
receive link failure, and partitioning-active for each
port.
Network downtime is prevented through automatic
partitioning of faulty segments. When normal
operation resumes, reconnection also takes place
automatically.
Network traffic and collision information on each
segment may be monitored in the modules. Front
panel LEDs indicate when data is received and
when collisions occur.
MANAGEABLE CONNECTIVITY
LE-240XTC, LE-280XT and LE-180XT can be
monitored and controlled by LANNET's MultiMan
Network Management System or any other SNMP-
compliant system. MultiMan offers comprehensive
performance and event reporting down to the port
detail level.
With MultiMan, configuring the modules' operation
parameters such as standalone mode, primary and
secondary bus or port redundancy is as easy as
point-and-click.
Switches
In the absence of a management agent, the
modules may be manually controlled. On-board
DIP switches let you fully configure the selectable
parameters prior to installation in the hub.
Standard Mode
Each module allows selection between two modes
of operation: standard or standalone. In standard
mode, the module is connected to any one of the
four Ethernet buses on the backplane of the hub.
Standalone Mode
In standalone mode the module does not interface
with the backplane Ethernet buses at all, and
thereby functions as a multiport repeater on an
independent LAN. Standalone mode enables the
hub to house up to 16 separate, yet fully managed,
Ethernet segments.

4. SPECIFICATIONS
n Interfaces
The LE-180XT is equipped with 12 shielded
RJ-45 connectors compatible with UTP and STP
cabling.
The LE-280XT is equipped with 24 shielded
RJ-45 connectors compatible with UTP and STP
cabling.
The LE-240XTC is equipped with two TELCO
connectors supporting 12-ports each.
n Link Lengths
160m (525 ft) – 24 AWG Unshielded Twisted Pair
such as TIA/EIA 568 category 3
n Signaling
As specified in IEEE 802.3 10BASE-T
n LED Indicators
The LEDs on the front panel provide the
following indications:
LE-180XT:
1,2,3,4 Active Ethernet Bus
A Automatic Management via software
Manual Management via Hardware
switches
<> Redundant ports
1-12 Port Status (one LED per port)
LE-280XT and LE-240XTC:
1,2,3,4 Active Ethernet Bus
A Automatic Management via software
Manual Management via Hardware
switches
<> Redundant ports
1-24 Port Status (one LED per port)
R indicates activity in any port
C collisions between ports or
between port and bus
n Auto-Partitioning
Port:
After 32 consecutive collisions or a collision
that lasts longer than 2048 bits
Reconnection:
After receive or transmit of a packet of at least
512 bits with no collisions
Bus:
After 64 consecutive collisions or a collision that
lasts longer than 4096 bits (only when redundant
bus has been assigned and activated)
n Environmental
Operating
Temperature: 0°-40°C (32°-104°F)
Humidity: 5% to 95% non-condensing
EMI: Emission- Meets FCC part 15,
subpart J, class A;
and EN55022 class B
Immunity- Meets EN50082-1
CE: Meets with requirements
n Mechanical
Width: LE-180XT 4HP (20mm) 1 slot
LE-280XT 8HP (40mm) 2 slots
LE-240XTC 4HP (20mm) 1 slot
Size: Height 253 mm (9.96 in)
Depth 232 mm (9.13 in)
Weight: LE-180XT 0.465 kg (1.023 lb)
LE-280XT 0.72 kg (1.6 lb)
LE-240XTC 0.56 kg (1.2 lb)
n Power Consumption
1.5 Amps at 5 VDC for LE-280XT & LE-240XTC
1.0 Amps at 5 VDC for LE-180XT
ORDERING
833052 LE-240XTC 10BASE-T 24-Port Enhanced
Ethernet Repeater Module
(TELCO connectors)
833053 LE-280XT 10BASE-T 24-Port Enhanced
Ethernet Repeater Module
(RJ-45 connectors)
833056 LE-180XT 10BASE-T 12-Port Enhanced
Ethernet Repeater Module
(RJ-45 connectors)
Americas
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Madge Networks
Madge, the Madge logo, LANNET, MultiNet, MultiMan, LANswitch, LANstack,VirtualMaster,VirtuaLAN, DecodeMaster, InterMaster, RMONMaster, SMONMaster, SecureMaster, TerrainMaster and Cellenium aretrademarks,
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Data is subject to change without notice
© Copyright 1995 Madge Networks. All Rights Reserved. DS-
Madge Networks N.V. acquired LANNET Data Communications
Ltd. on November 28, 1995.