The document summarizes LANNET LANswitch Plus hubs, which combine shared and switched LANs to reduce the cost and complexity of migrating networks to ATM. The hubs feature a modular design that supports a variety of network environments and switching technologies. This provides investment protection and allows users to gradually adopt high-speed switching and migrate to ATM at their own pace.

1. I N V E S T M E N T
P R O T E C T I O N
LANNET LANswitch
Plus hubs combine
any mix of shared
and switched LANs,
greatly reducing the
expense and
complexity of
migrating to ATM.
n today’s highly competitive business
environment, corporate networks are
experiencing serious bandwidth
limitations due to the growing use of
increasingly powerful applications, expanding
number of users, and emerging requirements
for voice, video, and multimedia support.
Because of these factors, networking–both
as an industry and a technology–is in the
process of an evolution to high-speed
switching and ATM. However, the process
of integrating existing enterprise networks
into an ATM environment cannot be achieved
overnight. Until then, organizations need
a way to meet the increasing demand for
network services today, and prepare the
foundation for a smooth migration to
the ATM networks of tomorrow, while
maximizing their current network investment.
LANNET LANswitch Plus hubs with their
full complement of plug-in modules provide
the means to do just that.
A F L E X I B L E F O U N D AT I O N
The LET-36, LET-20 and LET-10 switching
hubs are the foundation for a total networking
solution that delivers the right set of features,
right when you need them. LANswitch’s
modular hub design supports a broad range
of network environments and makes it easy
for network users to adopt and assimilate
high-speed switching technologies and
emerging standards, such as ATM, at their
own pace.
LANNET LANswitch Plus
LET-36/20/10 Enterprise Switching Hubs
H I G H - P E R F O R M A N C E S W I T C H I N G A N D
E X C E P T I O N A L I N V E S T M E N T P R O T E C T I O N
The LANNET LANswitch™ Plus LET-36, LET-20 and LET-10 switching hubs deliver everything
your enterprise network needs to help you remain competitive, including flexible connectivity,
high-performance switching, complete fault-tolerance, full manageability and exceptional
investment protection.
I

2. A D VA N C E D B A C K P L A N E T E C H N O L O G Y
The sophisticated backplane architecture
found in every LANswitch Plus hub
provides the kind of versatile connectivity
that enterprise networks need. Each hub
backplane supports four Ethernet buses, two
Token Ring buses, and one FDDI bus for
shared LANs, plus the protocol-
independent, 2.56 Gbps Cellenium™ Bus
for switched LANs.
This unique ability to integrate shared
and switched LANs in the same hub allows
users to gradually migrate to switched LANs
modules that can be mobilized to meet the
networking requirements of large organi-
zations. These modular, interchangeable
components give LANNET customers the
ability to create a custom network by mixing
and matching a wide variety of switching,
connectivity, internetworking, and
management modules within the hub.
S TA N D A R D S – B A S E D C O N N E C T I V I T Y
LANNET’s complete line of standards-
compliant connectivity modules guarantees
no limitation on cabling options. Every type
and ultimately, to ATM, while leveraging
their existing network components and
infrastructure to the fullest.
M O D U L A R , F L E X I B L E D E S I G N
In addition to their advanced backplane,
LANswitch Plus hubs’ strength and
versatility lies in the extensive range of
plug-and-play
of UTP, STP, fiber-optic and coax media
with virtually any connector can be inter-
faced to the hub backplane. Likewise, users
can choose from a range of port densities
which will satisfy the requirements of small
workgroups as well as enterprise network
installations.
LANNET
LANswitch Plus
Enterprise
Switching Hubs
LET-20
LET-36
LET-10
ATM
ATM
Routing
Services
Shared and Switched LANs
in the same hub enclosur e
Multiple LAN Pr otocols
in the same hub enclosur e
Redundant inter-hub links and
comprehensive Network Mgmt.
Token Ring
Ethernet
Server
Far m
Montage
Mgmt.Console
LET-36 as Switched
Collapsed Backbone
To Campus
ATM Backbone
WAN
Connection
WAN
WAN
LANswitch Plus hubs provide
the ultimate migration path to
ATM networking. LANswitch
Plus hubs in the wiring-closet
are interconnected via a
switched collapsed backbone,
which in turn, provides access
to the WAN and ATM.

3. P E E R L E S S FA U LT – T O L E R A N C E
To maintain their competitive edge,
companies depend on computer networks
for the timely flow of vital information.
Network downtime translates into lost
productivity, and ultimately lost revenues.
That’s why LANswitch Plus safeguards
every possible point of network failure.
LANswitch Plus hubs feature peerless fault
tolerance in the form of:
. Redundant bus configurations.
. Distributed modular architecture,
enabling intelligent functions such as
timing, switch processing and backup
links of all kinds to be dispersed
throughout the hub.
. Multiple power sources and backup
power supplies that protect against
general electrical failure.
. Hot Swappable modules.
I N V E S T M E N T P R O T E C T I O N
LANswitch Plus hubs give network users
the flexibility to adopt high-speed switching
at their own pace. Performance-boosting
LANswitch Plus modules plug directly into
the hub chassis, allowing customers to
deploy high-speed switching technology
where it is needed most by simply swapping
modules in and out of the hub.
This built-in flexibility also paves
a smooth migration path to ATM. In fact,
LANswitch Plus is the only hub in the
industry that provides easy coexistence and
migration from shared LANs–to switched
LANs–to ATM, with no hub or backplane
upgrade.
F U L LY M A N A G E A B L E
LANswitch Plus hubs and their full range
of modules are monitored and managed by
Montage™, LANNET’s suite of SNMP-
based network management applications.
Quickly locating the source of a problem
and correcting it is critical to maintaining
good network performance. The Montage
Network Management System provides all
the information network managers need to
troubleshoot the network and keep it
running smoothly.
Agent modules plug into the hub and
work together with Montage to put
comprehensive analysis and control at the
network manager’s fingertips. Montage’s
powerful graphical interface allows the
network administrator to view the status of
any LANswitch Plus hub and its resident
modules, and to perform remote
configurations through an easy-to-learn point-
and-click user interface.
Montage is fully integrated with such
popular management platforms as
HP OpenView/UNIX, HP OpenView/
Windows, and IBM NetView. All
management agent modules are SNMP-
compliant, allowing LANswitch Plus hubs
to be managed by any SNMP-based
management application.
T H E M U LT I N E T H U B FA M I LY
LANNET’s premiere enterprise switching
hub, the LANswitch Plus LET-36, can be
configured with up to eighteen LAN
segments supporting network connections
for 432 stations. That’s one of the highest
port densities of any hub on the market.
The LET-36 is equally at home in the
wiring closet or serving as the “hub of hubs”
for complex enterprise networks.
The LANswitch Plus LET-20 hub
accom-modates a maximum of ten plug-in
modules. The hub features a retractable fan
tray, a field installable/replaceable backplane
and front loaded primary and backup power
supplies for easy maintenance.
The LANswitch Plus LET-10 hub
houses five module slots and offers the right
amount of connectivity for small workgroups
and remote branch offices without
compromising high-end features.
LANNET
LANswitch Plus
Enterprise
Switching Hubs

4. P R O D U C T S P E C I F I C AT I O N S
L E T- 1 0 L E T- 2 0 L E T- 3 6
B A C K P L A N E Each LANswitch Plus hub backplane contains four Ethernet buses, two Token Ring buses, one
FDDI bus and the 2.56 Gbps Cellenium switching bus
N U M B E R O F S L O T S 5 module slots 10 module slots 18 module slots
P O W E R R E Q U I R E M E N T S
Entry: 220VAC, 1.5A, 50 Hz 220VAC, 2.5A, 50 Hz 220VAC, 3.2A, 50 Hz
110VAC, 3.0A, 60 Hz 110VAC, 5.0A, 60 Hz 110VAC, 6.3A, 60 Hz
-48VDC, 6.5A
Output: 5 VDC, 25A 5 VDC, 40A 5 VDC, 50A
Backup Power Supply: Optional, field-installable/ Optional, front-loaded field- Optional, field-installable/
replaceable installable/replaceable replaceable (supports load
(supports load sharing) sharing)
P H Y S I C A L C H A R A C T E R I S T I C S
Dimensions in mm (h,w,d): 132.5 x 482.7 x 318 310.3 x 482.7 x 273.5 271 x 482.7 x 499
Weight: 6.14 kg 8.20 kg 13.88 kg
Installation: 19” rack mountable 19” rack mountable 19” rack mountable
E N V I R O N M E N TA L
Operating Temperature: 0-40 degrees Celsius
Humidity: 5% to 95% non-condensing
A G E N C Y A P P R O VA L
EMI: Emission meets FCC part 15, subpart J, class A; and EN55022 class B, CE
Immunity meets EN50082-1
Safety: 230V–approved for EN60950 (TUV)
115V–approved for UL1950 (UL), and for CS22.2 (UL or CSA)
O R D E R I N G I N F O R M AT I O N
Hubs: 831009 LET-10/115 831005 LET-20/115 831003 LET-36/115
5-slot LANswitch Plus hu 10-slot LANswitch Plus hub 18-slot LANswitch Plus hub
for 115VAC for 115VAC for 115VAC
831010 LET-10/230 831006 LET-20/230 831004 LET-36/230
5-slot LANswitch Plus hub 10-slot LANswitch Plus hub 18-slot LANswitch Plus hub
for 230VAC for 230VAC for 230VAC
831007 LET-20/48
10-slot LANswitch Plus hub
for -48VDC
Backup Power Supply: 890117 BUPS-LET-10/115 890127 LPS-225/115 890119 BUPS-LET-36/01/115
890118 BUPS-LET-10/230 890126 LPS-225/230 890120 BUPS-LET-36/01/230
(dual AC source options 890128 LPS-225/48
available)
Specifications subject to change without notice.
C U S T O M E R S U P P O R T W I T H O U T L I M I T S
LANswitch Plus LET-36, LET-20 and
LET-10 are backed by LANNET’s
expertise in networking and a worldwide
network of Value Added Resellers.
Customers can also download up-to-date
information from the LANNET World
Wide Web home page
(http://www.lannet.com).
The LANswitch Plus LET-36, LET-20
and LET-10 come with a one-year hardware
warranty.
LANNET
LANswitch
Plus Enterprise
Switching Hubs
Israel
LANNET Ltd.
Atidim Technology Park
Building 3
Tel-Aviv 61131
Israel
Tel +972 3 645 8458
Fax +972 3 648 7146
http://www.lannet.com
USA
LANNET Inc.
150 Knowles Ave.
Los Gatos, CA 95032
USA
Tel 1-888-ETHERNET
(408) 871-4000
Fax (408) 871-4100
http://www.lannet.com
Other Offices
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LANNET, the LANNET logo, Cellenium, LANswitch, Montage, MultiNet, SMON, TerrainMaster, and Visage are trademarks, and in some jurisdictions may be registered
trademarks, of LANNET Ltd., Madge Networks or its affiliated companies. Other trademarks appearing in this document are the property of their respective owners.
© Copyright 1998 LANNET. All Rights Reserved. 143011 Rev. 0 1/98