3com LinkBuilder FMS II Hub Configuration manual

3com
Brand
3com
Model
LinkBuilder FMS II Hub
Category
Network switch modules
Type
Configuration manual

This manual is also suitable for

FIRST FLOOR
SECOND FLOOR
THIRD FLOOR
3C16671
STATUS UNIT
LinkBuilder 
FMS II
LinkBuilder 
FMS II Telco
3C1667-2
LinkBuilder 
FMS II
3C16670
STATUS UNIT
LinkBuilder 
FMS II
3C16665
STATUS UNIT
3C16671
STATUS UNIT
LinkBuilder 
FMS II
®
®
LinkBuilder Hub
Configuration
Guide
21 LinkBuilder Hub Configuration Guide
Table of Contents
Decision Tree for 3Com LinkBuilder Hubs 2
3Com Connectivity Solutions
Solution 1: Managed Ethernet Connectivity 4
Solution 2: Managed Token Ring Connectivity 6
Solution 3: Building a Resilient Network 8
Solution 4: Bridging and LAN Segmentation 10
Solution 5: LAN Switching and High-Speed Connectivity 12
LinkBuilder MSH Multi-Services Hub 14
LinkBuilder FMS II Stackable Ethernet Hubs 16
LinkBuilder FMS TR Stackable Token Ring Hubs 18
Fixed-Port Hubs, Repeaters, and Accessories 19
Intelligent Switches 21
Quick Reference Guide to 3Com Switching Products 22
Transcend Network Management 24
LinkBuilder Hub Configuration Guide 1
About This Guide
Whatever your networking environment, 3Com has a hub solution to meet your
needs. Our versatile multi-services hubs let you mix LAN technologies, wiring
types, and configurations in a single chassis, allocating bandwidth to fit the needs
of individual users and groups. Stackable Ethernet and Token Ring hubs give you
flexible, cost-effective, fault-tolerant solutions that grow with your network. Plus,
there are fixed-port repeaters—both unmanaged and intelligent—to suit every
need. And every 3Com LinkBuilder
®
hub is backed by our outstanding quality,
service, and support.
SmartAgent
®
intelligent management agents in 3Com hubs gather and correlate
information, keeping management traffic to a minimum while eliminating manual
polling. Combined with 3Com’s Transcend
®
management applications, these
SmartAgent software agents provide integrated management of adapters, hubs, and
a wide range of other network devices. 3Com’s LinkBuilder hub family is part of
our High-Performance Scalable Networking (HPSN) architecture, providing pow-
erful, versatile system solutions that let you scale the performance and extend the
reach of your network.
This guide introduces 3Com’s LinkBuilder hubs. You’ll find network solutions that
illustrate how 3Com hubs can provide connectivity in a wide range of floor distri-
bution environments. And there’s a detailed description of each hub, including its
modules and accessories. You’ll also find an overview of 3Com’s leading edge
switching products, which can provide a dramatic performance boost in virtually
any network.
2 LinkBuilder Hub Configuration Guide
Small LAN or workgroup where
future expansion is not required
(up to 50 users)
Medium- to large-sized LAN
where expansion is likely
(more than 50 users)
Remote office connected via a
NETBuilder
®
bridge/router
High-performance/high-traffic
switched LAN or workgroup
No
No
Yes
Yes
and
No
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes
Yes
No
No
No
Yes
Yes
Yes
No
Yes
LinkBuilder TP/8
3C16180
LinkBuilder TP/12
3C16170
LinkBuilder TP/8i
3C16181
LinkBuilder FMS II
3C16670 (12-port TP)
3C16671 (24-port TP)
3C16665 (6-port Fiber)
3C16672 (24-port Telco)
LinkBuilder FMS
3C1625-0 (10-port Coaxial)
LinkBuilder FMS TR
3C510500 (12-port)
3C510501 (24-port)
LinkBuilder MSH
3C18040 (Chassis)
LinkBuilder TP/8
3C16180
LinkBuilder TP/12
3C16170
LinkBuilder TP/8i
3C16181
LinkBuilder FMS II
LinkBuilder FMS TR
SuperStack System
LinkBuilder FMS II
LinkBuilder FMS 100
3C250-TX/I (12-port TP)
LinkSwitch 500
3C30500
LinkSwitch 1000
3C16900
LinkSwitch 1200
3C16640
LinkSwitch 2200
3C220000
LinkSwitch 2700
3C32730 with OC-3c
LinkBuilder MSH
3C18041 (Chassis with
FDDI backplane)
8
12
8
12
24
6
24
10
12
24
Up to 240
(Ethernet)
up to 108
(Token Ring)
up to 54
(FDDI)
8
12
8
12
10
24
6
16
12
Up to 240
(Ethernet)
up to 108
(Token Ring)
up to 54
(FDDI)
10BASE-T/RJ-45
10BASE-T/RJ-45
10BASE-T/RJ-45
10BASE-T/RJ-45
10BASE-T/RJ-45
10BASE-FL/ST
10BASE-T/Two 50-pin Telco
BNC
12 RJ-45 UTP/STP ports
and 1 router port
24 RJ-45 UTP/STP ports
and 1 router port
10BASE-T/Telco
10BASE-T/RJ-45
10BASE-FL/ST
10BASE-2/BNC
TR Lobe UTP/RJ-45
TR Lobe STP/RJ-45
TR RI/RO STP/DB-9
TR RI/RO Fiber/ST
FDDI/MIC
CDDI/RJ-45
10BASE-T/RJ-45
10BASE-T/RJ-45
10BASE-T/RJ-45
10BASE-T/100BASE-T
10BASE-T/RJ-45
10BASE-T/RJ-45
100BASE-T/RJ-45
10BASE-T/RJ-45
SAS Fiber MIC
10BASE-T/RJ-45
SAS Fiber MIC
10BASE-T/RJ-45
155 Mbps OC-3c/SC or
45Mbps DS-3/BNC
10BASE-T/Telco
10BASE-T/RJ-45
10BASE-FL/ST
10BASE-2/BNC
TR Lobe UTP/RJ-45
TR Lobe STP/RJ-45
TR RI/RO STP/DB-9
TR RI/RO Fiber/ST
FDDI/MIC
CDDI/RJ-45
None
Bridge MicroModule
Transceiver Interface Modules
Bridge MicroModule
Transceiver Interface Modules
Management Module
Bridge Management Module*
Bridge MicroModule
Transceiver Interface Modules
RMON Management
Advanced RMON Management
Copper/Fiber RI/RO
Management Module
Ethernet Bridge Module
Token Ring Bridge Module
Token Ring RMON Module
Media Modules
Transceiver Interface Modules
None
Bridge MicroModule
Transceiver Interface Modules
Bridge MicroModule
Transceiver Interface Modules
RMON Management
100BASE-TX
100BASE-FX
None
100BASE-FX Fiber Downlink Module
FDDI (DAS) MIC Media Module
None
None
Management Module
Ethernet Bridge Module
Token Ring Bridge Module
Token Ring RMON Module
LinkSwitch 1200 Module
Media Modules
Transceiver Interface Modules
Module Options
Media/Connections
Number
of Ports
Product Name and Part No.
Support for
Mixed Media
Management
RequirementsNetwork Type
Decision Tree for 3Com LinkBuilder Hubs
See “Medium- to large-sized LAN where expansion is likely” for information.
See “Medium- to large-sized LAN where
expansion is likely” for information.
See “Medium- to large-sized LAN where expansion is likely” for information.
*Bridge Management Module is not available for the FMS coaxial hub.
LinkBuilder Hub Configuration Guide 3
The SuperStack
Advantage
3Com’s SuperStack system gives you
a simple, cost-effective connectivity
solution for local, wide area, and SNA
networks. With SuperStack, you can
combine diverse technologies and net-
work services in one stacked system,
strengthen it with redundant power
and resilience, and manage it all with
Transcend management software.
A single SuperStack system provides
connections for a range of LAN envi-
ronments: Ethernet, 100BASE-T Fast
Ethernet, Token Ring, FDDI, and ATM.
Depending on your needs, you can build
SuperStack systems for virtually any net-
work environment. Capabilities include:
• Flexible, cost-effective connectivity
for Ethernet or Fast Ethernet work-
groups with SNMP management
• Industry-leading physical layer sup-
port and RMON management for
Token Ring networks
• Support for the multiple functions
and technologies needed in diverse
floor distribution environments
• Ethernet, FDDI, and ATM switching
that boosts performance in high-
speed client/server LANs
• Full multiprotocol network access for
users calling in from personal offices
or other off-site locations
• Routing between central site and
branch offices using innovative
Boundary Routing
®
architecture or
conventional routing software for mul-
tiple WAN choices, including ISDN
• SNA-to-LAN conversion linking local
and remote offices to an SNA host
system
As an important part of 3Com’s High-
Performance Scalable Networking archi-
tecture, SuperStack is designed to meet
the demands of growth and technological
change—allowing you to future-proof
your network investment as you go.
Great value with plug-and-play simplicity. Compact design
with bandwidth utilization meter and advanced LED diagnos-
tics for trouble-free operation. BNC backbone connection
and MDI port for cascading to other hubs.
Proven reliability, easy to install and configure. LEDs on
the front panel indicate collisions, packet receptions.
MDI/MDIX switch for cascading to other hubs. Optional
backbone media and bridge modules.
Easy plug-and-play installation, SNMP manageable,
optional backbone media and bridge modules. MDI/MDIX
switch allows cascading to other hubs. Optional Transcend
network management.
The leading SuperStack stackable Ethernet hub. Easy
expansion —stack up to 8 hubs to connect 208 users.
Pro-active RMON management, security features, resilient
links, and optional Transcend network management.
Stackable hub for easy expansion—connect up to 260
users per ring. Advanced performance and fault-tolerant
features: Zero Delay Lockout, Distributed Recovery
Intelligence, Phase Locked Loop retiming. Optional
Transcend network management.
11-slot, advanced technology hub with hot-swappable
modules. Ethernet, Token Ring, and FDDI support. Robust
features; optional modules support mixed media, Ethernet-
to-FDDI switching, FDDI concentration, and bridging.
Advanced fault tolerance with patented LAN Security
Architecture to safeguard data on Ethernet LANs.
Optional Transcend network management.
See “Medium- to large-sized LAN where
expansion is likely” for information.
See “Medium- to large-sized LAN where
expansion is likely” for information.
See “Medium- to large-sized LAN where
expansion is likely” for information.
Combine LinkBuilder FMS II hubs with a LinkSwitch or
LinkBuilder FMS 100 hub to relieve network congestion.
Choose from stackable Ethernet to FDDI, ATM, and Fast
Ethernet units. Optional Transcend network management
provides complete control of the entire stack.
SuperStack stackable Fast Ethernet hub with optional
100BASE-TX modules and expansion to 206 Fast Ethernet
ports. Optional SNMP management available.
See “Medium- to large-sized LAN where
expansion is likely” for information.
Features and Advantages
Backbone WAN/SNA Host
Network 
Management 
Software
Redundant
Power System
SNA-to-LAN 
Converters
Remote Access
Servers
Routers
Hubs
Switches
Large Remote Office
Central Site
NETBuilder II
in Computer Room
NETBuilder Remote Office 222
LinkBuilder FMS II (12-Port)
LinkBuilder FMS II (24-Port)
Redundant Power System
LinkBuilder MSH
Fiber
®
LinkBuilder
RPS
3C565047
Redundant Power Supply
SYSTEM
LinkBuilder
Remote Office
LinkBuilder
FMS II
LinkBuilder
FMS II
INPUT OUTPUT
Fault Overtemp
OK
Link
Active
Fault
Status
RS-449 (B) RS-232 (C)
WAN INTERFACES
STATUS
1 2 3 4 5 6 7 8 9 10 11 12
1 3 14 15 16 17 18 19 20 21 22 23 24
Fwd Power/
Fault
Reset
Send
Active
Fault
Link
10BT
+/-
A B C
Console
10-Base T AUI
UNIT
Red = Partition
1 2 3 4
5 6 7 8
MDI
MDIX
TCVR
AUI
Packet 
Collision
Power
MGMT
3C16671
STATUS
1 2 3 4 5 6 
7 8 9 10 11 12
UNIT
Red = Partition
1 2 3 4
5 6 7 8
MDI
MDIX
TCVR
AUI
Packet 
Collision
Power
MGMT
3C16670
green = link OK 
Red = Partition
off = link fail
4 LinkBuilder Hub Configuration Guide
Solution 1:
Managed Ethernet Connectivity
Solution 1: Managed Ethernet Connectivity
Products
LinkBuilder FMS II 12-Port TP Hub
(3C16670)
LinkBuilder FMS II 24-Port TP Hub
(3C16671)
LinkBuilder FMS II Management Module
(3C16630)
NETBuilder Remote Office 222 (3C8222)
Redundant Power System (3C565047)
Highlights
At the large remote office, two
managed LinkBuilder FMS II hubs
combine with a remote router in a
SuperStack system, including the
Redundant Power System for added
reliability and maximum uptime. As
the network grows, more LinkBuilder
FMS II hubs can be added to the same
SuperStack system, forming a single
logical repeater. The hub’s advanced
RMON functionality features a
proactive polling mechanism for
cost-effective remote management.
Transceiver interface modules are
also available for backbone media
connections. (See page 19.)
Highlights
The large departmental workgroup at
the central site is an ideal application
for the powerful LinkBuilder MSH
hub. The LinkBuilder MSH is 3Com’s
most advanced, fault-tolerant floor
distribution concentrator, providing
high port density, resilient links, and
hot-swappable modules for maximum
uptime in mission-critical applica-
tions. A single management module
provides SNMP-based Transcend
management for the entire hub.
Corporate Headquarters
Large Remote Office
Requirements
Connect users in an enterprise-
wide Ethernet network, using
a mixture of twisted-pair, thin
coax, and fiber cabling. Provide
integrated network manage-
ment with security features
for data protection. Scale
the connectivity solutions
to meet the needs of a large
corporate headquarters,
an expanding remote site,
a small satellite office.
Small Satellite Office
LinkBuilder TP/8i
NETBuilder Remote Office 201
Local Workgroup
LinkBuilder
TP/8i
STATUS
1 2 3 4
Red = Partition
TCVR
green = link OK 
Red = Partition
off = link fail
STATUS
1 2 3 4
green = link OK 
Red = Partition
off = link fail
MDI
MDIX
Packet 
Collision
Power 
MGMT
3C16181
Security: Defending
Data and Resources
The LinkBuilder FMS II hubs and the
Ethernet modules in the LinkBuilder MSH
support 3Com’s LAN Security Architecture
(LSA), making them highly effective tools
for safeguarding valuable data and com-
puting resources. A patented, chip-based
system, LSA provides the following power-
ful security features:
• Need to Know protects sensitive data
on the network by checking destination
addresses on each packet and sending
readable packets only to authorized
nodes.
• Disconnect Unauthorized Device auto-
matically records and/or disables an
unauthorized device attempting to log
on to the network.
• Audit Log gives the manager a
complete record of user and device
changes on the network.
• Multiple User Levels ensure that only
authorized users have access to
critical network functions.
• Passwords can be used to identify
network managers.
Stand-alone encryption systems that pro-
vide the same protection are expensive
and relatively difficult to implement, and
can adversely affect network performance.
Solution 1: Managed Ethernet Connectivity
Small Satellite Office
Highlights
The smaller satellite office is not
expected to grow, but users need to
share data and access resources at
the central site. With its built-in
SmartAgent intelligence and optional
local bridging, the 8-port LinkBuilder
TP/8i fixed-port hub is a robust,
affordable solution.
Expansion modules connect
directly to the LinkBuilder MSH
coax or fiber Ethernet modules.
These expansion modules reduce
connectivity costs and easily
accommodate diverse cabling
requirements. Similarly, the 7-port
UTP module features six RJ-45
ports and a transceiver interface
port for connection to the backbone.
Products
LinkBuilder TP/8i Hub (3C16181)
NETBuilder Remote Office 201 (3C8201)
Products
LinkBuilder MSH Chassis with FDDI
Backplane (3C18041)
LinkBuilder MSH 525W Power Supply Unit
(3C18012)
LinkBuilder MSH 24-Port 10BASE-T
Repeater Module (3C18122A)
LinkBuilder MSH 13-Port 10BASE-T
Repeater Module (3C18120A)
LinkBuilder MSH 7-Port 10BASE-T
Repeater Module (3C18124A)
LinkBuilder MSH Management Module
(3C18500)
LinkBuilder MSH Transceiver Interface
Expansion Module (3C18146)
Fiber-Optic Transceiver Interface Module
(3C1206-5)
NETBuilder II Bridge/Router 4-Slot Chassis
(3C6000)
Fiber-Optic Repeater Module (3C18135A)
6 LinkBuilder Hub Configuration Guide
Solution 2: Managed Token Ring Connectivity
Solution 2:
Managed Token Ring Connectivity
Highlights
For flexible, cost-effective network
expansion in Token Ring environ-
ments, the LinkBuilder FMS TR fea-
tures industry-leading physical layer
support, including Phase-Locked
Loop (PLL) per-port retiming, Zero
Delay Lockout (ZDL), and jitter
reduction, with support for up to
260 users per ring.
Optional Ring In/Ring Out expan-
sion modules provide copper (UTP
or STP), fiber, and copper/fiber con-
nections for flexible expansion over
different types of media. These RI/RO
expansion modules also allow main
ring connections from separate wiring
closets as the LAN expands.
For network optimization and
control, Transcend management
applications work with the
LinkBuilder FMS TR management
agent module to implement all 10
RMON groups and provide network
analyzer level functionality through
a user-friendly, graphical interface.
Part of 3Com’s SuperStack
system, the LinkBuilder FMS TR
can be combined with 3Com’s
LinkConverter
™
SNA-to-LAN con-
verters for SNAinternetworking, and
with the optional Redundant Power
System for maximum uptime.
Network Expansion with LinkBuilder FMS TR
Requirements
Incorporate a new document
imaging system requiring its
own 16 Mbps Token Ring net-
work into an existing 4 Mbps
Token Ring network. Add a
new workgroup to the network
using Token Ring stackable
hubs.
Products
LinkBuilder FMS TR 12-Port Hub (3C510500)
LinkBuilder FMS TR 24-Port Hub (3C510501)
LinkBuilder FMS TR RMON Management
Agent Module (3C510502)*
LinkBuilder FMS TR Advanced RMON
Management Agent Module (3C510505)*
LinkBuilder FMS TR Copper RI/RO Module
(3C510504)*
LinkBuilder FMS TR Fiber RI/RO Module
(3C510503)*
LinkBuilder FMS TR Copper/Fiber RI/RO
Module (3C510506)*
8-Foot Redundant Ring Cascade Cable
(3C510508)
Redundant Power System (3C565047)
*
For the 12-port hub only
Solution 2: Managed Token Ring Connectivity
Highlights
The LinkBuilder MSH Token Ring
modules provide an array of Token
Ring physical layer resilience fea-
tures unmatched in the industry.
Phase-Locked Loop (PLL) per-port
retiming, Zero Delay Lockout (ZDL),
and jitter reduction ensure a clean
signal and prevent beaconing nodes.
These features ensure greater relia-
bility across Token Ring networks,
support more devices over greater
distances, and ensure that devices do
not interrupt the network by insert-
ing into the ring at the wrong speed.
This solution exploits the
LinkBuilder MSH hub’s ability to
handle multiple Token Ring paths
running at 4 or 16 Mbps. The addi-
tion of a second RingBuilder
™
module allows the MAUs to be
divided into two Token Rings. The
Local Token Ring Bridge module
provides fully integrated bridging
between those rings—in this case,
between a 4 Mbps ring and the
16 Mbps imaging system ring.
®
RI/RO to 4 Mbps
Token Ring
path connections
2-Port Bridge
Module
Advanced MAU Modules
16 Mbps Token Ring
for document imaging 
system
4 Mbps Token Ring
RingBuilder
Modules
Token Ring backbone
Configuring the
LinkBuilder MSH
in a Token Ring
Environment
Use the following rules to configure
the LinkBuilder MSH for Token Ring.
• The Advanced MAU module
does not count as a station.
• The STP or UTP MAU module
counts as one station.
• The STP or Fiber RingBuilder
module counts as three stations.
• The maximum Level 5 UTP
cable lengths for the Advanced
MAU module are:
400 m lobes, 260 stations (4 Mbps)
200 m lobes, 260 stations (16 Mbps)
• The maximum STP cable
lengths for the Advanced MAU
module are:
600 m lobes, 260 stations (4 Mbps)
300 m lobes, 260 stations (16 Mbps)
• The maximum STP trunk cable
lengths for the RingBuilder
RI/RO are:
770 meters (4 Mbps)
346 meters (16 Mbps)
• The maximum UTP trunk cable
lengths for the RingBuilder
RI/RO, when used in conjunction
with approved media filters, are:
100 meters for Level 3 UTP
150 meters for Level 4 UTP
200 meters for Level 5 UTP
Products
LinkBuilder MSH Chassis with FDDI
Backplane (3C18041)
LinkBuilder MSH 525W Power Supply Unit
(3C18012)
LinkBuilder MSH Fiber RingBuilder
Modules (3C18240)
LinkBuilder MSH Advanced MAU Module
(3C18202)
LinkBuilder MSH 2-Port Token Ring Bridge
Module (3C18620)
LinkBuilder MSH Management Module
(3C18500)
Bridged Token Ring with LinkBuilder MSH
LinkBuilder Hub Configuration Guide 7
8 LinkBuilder Hub Configuration Guide
Solution 3:
Building a Resilient Network
Solution 3: Building a Resilient Network
To switch 
(primary)
To switch
(secondary)
®
Management
Module
13-Port 10BASE-T 
Module
PC PC
24-Port 10BASE-T 
Module
PC
Highlights
This solution uses LinkBuilder MSH
hubs and LinkBuilder FMS II stack-
able hubs in the wiring closets linked
to two central LANplex
®
6004
switches. The fiber optic backbone
also provides inherent resilience and
immunity from noise.
To protect the mission-critical
applications, each LinkBuilder MSH
hub has a connection to each of the
LANplex switching hubs. One con-
nection is designated the primary link,
while the other functions as a backup.
(Up to 16 Ethernet resilient link pairs
can be configured on a LinkBuilder
MSH hub.) The primary and second-
ary links are connected to separate
modules in the LinkBuilder MSH hubs
to protect the network against the fail-
ure of a single component.
The LinkBuilder MSH has other
resiliency features as well. Distributed
Repeater Architecture provides each
Ethernet module with its own repeater,
so a failure in one module cannot
bring down the others. And redundant
power supplies provide additional
protection. If one power supply fails,
the other takes over and an alert is
sent to the management station.
LinkBuilder MSH Configuration
Requirements
Install a new structured cabling
system in a multi-floor build-
ing using a fiber backbone and
UTP floor wiring. The new
configuration replaces a thick
Ethernet backbone and thin
Ethernet floor wiring. New
hubs are needed in the wiring
closets on the floors and in a
data center. On some floors,
space considerations dictate
the use of compact, stackable
hubs. This network will run
mission-critical applications.
LinkBuilder Hub Configuration Guide 9
Solution 3: Building a Resilient Network
Rx Tx
Rx
loss
Highlights
For smaller workgroups, or where
space is a concern, LinkBuilder
FMS II stackable hubs with the
Bridge Management Module using
Spanning Tree Algorithm (STA)
can provide redundant paths to the
LANplex switching hubs in the
data center.
A Redundant Power System
ensures constant power for up to
four SuperStack units. Additional
Redundant Power Systems can be
added if required. The system com-
prises two load-sharing bulk power
supplies fed by two independent AC
lines. In the event of a failure in one
of the supplies, an alarm is automati-
cally sent to the management con-
sole. The system also has redundant
fans and LED temperature indicators
to protect against failures caused by
overheating.
Products
LinkBuilder FMS II 24-Port TP Hub
(3C16671)
LinkBuilder FMS II Telco Hub (3C16672)
LinkBuilder FMS II Fiber Hub (3C16665)
LinkBuilder FMS II Bridge Management
Module (3C16040)
Redundant Power System (3C565047)
SuperStack Configuration
Products
LinkBuilder MSH Chassis with FDDI
Backplane (3C18041)
2X LinkBuilder MSH 525W Power Supply
Units (3C18012)
LinkBuilder MSH 13-Port 10BASE-T
Repeater Module (3C18120A)
LinkBuilder MSH 24-Port 10BASE-T
Repeater Module (3C18122A)
LinkBuilder MSH Management Module
(3C18500)
Fiber-Optic Transceiver Interface Module
(3C1206-5)
10 LinkBuilder Hub Configuration Guide
Solution 4: Bridging and LAN Segmentation
Solution 4:
Bridging and LAN Segmentation
®
3 Ethernet
backplanes
Fiber backbone
4-Port Bridge 
Module
UTP Modules
Management
Module
Highlights
3Com’s chassis-based LinkBuilder
MSH solution provides the high
degree of segmentation required by
this organization. The LinkBuilder
MSH 4-Port Ethernet Bridge Module
bridges the LAN segments across the
hub’s three backplanes, effectively
tripling the total network bandwidth
from 10 Mbps to 30 Mbps. The
bridge module supports Spanning
Tree Algorithm (STA), adding to
the resiliency of the hub.
The LinkBuilder MSH bridge
module has extensive filtering capa-
bilities, which help control network
traffic by isolating protocols and
ensuring that network segments are
only accessible by selected users.
3Com’s patented LAN Security
Architecture (LSA) provides
advanced security features like Need
to Know, which ensures that only
authorized users receive sensitive
data, and Disconnect Unauthorized
Device, which can automatically
deny access to network intruders.
Traffic among users within the
same segment is filtered by the
bridge module, keeping unnecessary
traffic off the rest of the network.
With Transcend network management
software, you can configure the entire
network from a single hub view, even
moving modules from one segment to
another via software.
The ST Fiber Optic Transceiver
Interface module plugs into the bridge
module to provide connection with
the fiber optic building backbone.
The LinkBuilder MSH also provides
the same level of segmentation in a
coax, fiber, RJ-45, or mixed media
environment.
Large Ethernet Network
Requirements
Subdivide a large Ethernet
network to cope with high traf-
fic levels that are adversely
affecting performance. Provide
safeguards against unautho-
rized network access.
Relocate a computer-aided
design (CAD) department
requiring two separate network
segments to the same floor as a
department running NetWare.
LAN traffic on all three net-
works must remain separate,
while still allowing for inter-
connections between the depart-
ments and the fiber backbone.
Provide a cost-effective LAN
extension with full segmenta-
tion capabilities. Connect a
small segment of users to the
existing network.
LinkBuilder Hub Configuration Guide 11
Highlights
3Com’s stackable Ethernet hubs can
provide a cost-effective network addi-
tion with full segmentation capabili-
ties and the benefits of 3Com’s LAN
Security Architecture. This solution is
also an option for a smaller network
where cost is a concern.
The slide-in LinkBuilder FMS II
Bridge Management Module lets you
segment the network, manage both
hub and bridge operations, and run
Spanning Tree Algorithm (STA) for
redundant links. It features a full
IEEE 802.1d transparent bridge com-
plete with a 1024-address filtering
database.
If all you need is low-cost, simple
bridging without sophisticated man-
agement capabilities, the LinkBuilder
Bridge MicroModule is the ideal
alternative. Just slide this unmanaged
local bridge into the transceiver inter-
face module slot of a LinkBuilder
FMS II hub.
With either option, you get
dramatic improvements in network
performance without the need to
purchase dedicated local bridges on
each floor.
Solution 4: Bridging and LAN Segmentation
Products
LinkBuilder MSH Chassis with FDDI
Backplane (3C18041)
LinkBuilder MSH 525W Power Supply Unit
(3C18012)
LinkBuilder MSH 24-Port 10BASE-T
Repeater Module (3C18122A)
LinkBuilder MSH 4-Port Ethernet Bridge
Module (3C18600)
LinkBuilder MSH Management Module
(3C18500)
Fiber-Optic Transceiver Interface Module
(3C1206-5)
Products
LinkBuilder FMS II 24-Port TP Hub
(3C16671)
LinkBuilder FMS II Telco Hub (3C16672)
LinkBuilder FMS II Fiber Hub (3C16665)
LinkBuilder FMS II Bridge Management
Module (3C16040)
Redundant Power System (3C565047)
CAD workstations
CAD
server
NetWare
®
users
NetWare 
department
server
CAD workstations
CAD
server
Rx Tx
Rx
loss
LAN Extension
LinkBuilder FMS II Bridge
Management Module
12 LinkBuilder Hub Configuration Guide
Solution 5:
LAN Switching and High-Speed Connectivity
Highlights
With powerful connectivity and
switching modules, the LinkBuilder
MSH hub can provide high-speed
FDDI floor concentration, as well
as floor-based switching between
Ethernet and FDDI LANs. High-
performance users get FDDI connec-
tions from the hub, while other users
keep their Ethernet links.
The FDDI RingBuilder module
creates an FDDI ring from multiple
FDDI fiber-optic concentrator mod-
ules within the LinkBuilder MSH hub.
FDDI-attached servers offer signifi-
cant improvement in file access over
Ethernet server connections in high-
bandwidth application environments.
The LinkSwitch 1200 module
and the LinkSwitch 1200 expansion
module provide full-speed switching
between up to nine Ethernet segments
and FDDI. The LinkSwitch 1200
module can connect to one of the
internal FDDI backplanes, or accom-
modate 1 or 2 FDDI fiber MIC media
modules for external single-attached,
dual-attached, or dual-homed con-
nections to the FDDI ring. The dual
homing feature provides additional
resilience by preventing the FDDI
ring from fragmenting if multiple
devices fail simultaneously.
Solution 5: LAN Switching and High-Speed Connectivity
Products
LinkBuilder MSH Chassis with FDDI
Backplane (3C18041)
LinkBuilder MSH 525 Power Supply Unit
(3C18012)
LinkBuilder MSH 24-Port 10BASE-T
Repeater Module (3C18122A)
LinkBuilder MSH FDDI Fiber-Optic Module
(3C18300)
LinkBuilder MSH FDDI RingBuilder Module
(3C18310)
LinkBuilder MSH LinkSwitch 1200 Module
(3C18640)
FDDI MIC Media Module (3C18320)
LinkBuilder MSH LinkSwitch Expansion
Module (3C18645)
LinkBuilder MSH Management Module
(3C18500)
LANplex 2500 (3C250100)
®
FDDI backbone
FDDI servers
Standard
workstations
LinkSwitch 1200 Module
(3C18640)
High-performance 
workstations
Chassis-Based High-Performance Workgroups
Requirements
Provide high-speed connections
to floor-based workgroups in
a large network with an FDDI
or ATM backbone. Servers are
distributed throughout the
building. Servers and high-
performance workstations need
higher bandwidth than can be
obtained with current Ethernet
connections.
LinkBuilder Hub Configuration Guide 13
Highlights
For switching in the SuperStack
environment, there’s the LinkSwitch
™
family of switching hubs. Choose
from stackable Ethernet, FDDI, and
ATM switching units to segment floor
wiring and improve performance in
workgroups, or to extend more band-
width to individual servers or work-
stations.
Solution 5: LAN Switching and High-Speed Connectivity
LinkSwitch: A
Switching Revolution
in the Workgroup
3Com’s LinkSwitch family of switches
eliminate client/server bottlenecks
with fast, simple, low-cost, highly
manageable designs that have revo-
lutionized workgroup switching.
Performance—Powerful switching
engines extend full 10 Mbps band-
width to the workgroup and up to
155 Mbps to the server or backbone,
eliminating network bottlenecks.
Simplicity—Plug-and-play installa-
tion and drag-and-drop graphical
configuration make adds, moves,
and changes exceptionally easy.
Low Cost—The switches deliver
high performance without the need
for expensive desktop or cabling
changes. They are priced for the
workgroup, making them affordable
for all workgroup applications,
including connecting individual
power users.
Manageability—Transcend manage-
ment gives you at-a-glance monitor-
ing and comprehensive control of the
entire workgroup—switches, hubs,
and adapters. Management tools
combine a high degree of flexibility
with a common look and feel.
SuperStack—Every LinkSwitch
workgroup switch is part of 3Com’s
SuperStack system, allowing you to
enhance connectivity, functionality,
and resilience by simply adding units
to the stack.
Fault Tolerance—For additional
uptime protection, you have the
option of using a Redundant Power
System.
Products
LinkBuilder FMS II 24-Port Hub (3C16671)
LinkBuilder FMS II Fiber Hub (3C16665)
LinkSwitch 500 (3C30500) or
LinkSwitch 1000 (3C16900) or
LinkSwitch 1200 (3C16640) or
LinkSwitch 2200 (3C220000)
(Shown below) or
LinkSwitch 2700 (3C32730) with OC-3c
LinkBuilder FMS II Management Module
(3C16630)
Redundant Power System (3C565047)
SuperStack Workgroups with LAN Switching
LinkBuilder
FMS II
LinkBuilder
FMS II
LinkSwitch
2200
LinkBuilder
RPS
3C565047
Redundant Power Supply
INPUT OUTPUT
Fault Overtemp
OK
STATUS
1 2 3 4 5 6 7 8 9 10 11 12
1 3 14 15 16 17 18 19 20 21 22 23 24
STATUSSTATUS
ETHERNET
UNIT
Red = Partition
1 2 3 4
5 6 7 8
MDI
MDIX
TCVR
AUI
Packet 
Collision
Power
MGMT
3C16671
STATUS
1 2 3 4 5 6 
7 8 9 10 11 12
1 2 3 4 5 6 
7 8 9 10 11 12
1 2 3 4 5 6 
7 8 9 10 11 12
UNIT
Red = Partition
1 2 3 4
5 6 7 8
TCVR
AUI
Packet 
Collision
Power
MGMT
3C16665
green = link OK 
Red = Partition
off = link fail
1 2 3 4 5 6 
A B 7 8 9 10 11 12 1 3 1 4 15 16
FDDI
AB
13 14 15 16
Serial Port
Ethernet
LinkSwitch
500
LinkSwitch
1000
LinkSwitch
1200
LinkSwitch
2200
LinkSwitch
2700
• Lowest Ethernet/ 
ATM price/port
• 12 RJ-45 UTP ports
• 8,192 MAC addresses
• Forwarding mode –
Cut-through and
Store and Forward
• Low entry price
• 6 RJ-45 UTP ports
• 1,014 MAC addresses
• Forwarding mode –
Store and Forward
• Lowest Ethernet- 
FDDI price/port
• 16 RJ-45 UTP ports
• 8,192 MAC addresses
• Forwarding mode –
Store and Forward
• Lowest price/port
and entry price
• 24 RJ-45 UTP ports
• 500 MAC addresses*
• Forwarding mode –
Cut-through and
Store and Forward
• 2 Fast Ethernet ports
• Lowest entry price
• 10 RJ-45 UTP ports
• 8,192 MAC addresses
• Forwarding mode –
Cut-through
Fast Ethernet
Which LinkSwitch Workgroup Switch?
Which high-speed server/backbone access technology?
FDDI
ATM
*Unlimited on the downlink
14 LinkBuilder Hub Configuration Guide
LinkBuilder MSH
LinkBuilder MSH is a multi-services
hub that can support up to 10 man-
aged Ethernet, 5 managed Token Ring,
or 3 managed FDDI workgroups over
diverse media types.
The LinkBuilder MSH offers out-
standing reliability and fault tolerance.
Each Ethernet connectivity module
has its own repeater, so a failure in one
module can’t bring down the others.
Automatic resilient links ensure relia-
bility and maximize uptime, and all
connectivity modules and power
supplies are hot-swappable, includ-
ing fans.
The Ethernet bridge module
provides the hub with affordable
segmentation to boost performance
on the floor. For high-speed floor
connectivity, FDDI concentrator
modules support FDDI using MIC
connectors and CDDI using RJ-45
connectors. FDDI RingBuilder mod-
ules build a single FDDI ring from
multiple FDDI concentrator modules.
In Token Ring LANs, the
LinkBuilder MSH features Phase-
Locked Loop retiming for reliable sig-
nals over larger rings, and Zero Delay
Lockout and Advanced Distributed
Recovery Intelligence to isolate faulty
stations from the network.
The LinkBuilder MSH hub
includes integrated support for
Ethernet RMON network manage-
ment. RMON agents and ASICs on
each connectivity module collect and
compile RMON data, providing pow-
erful monitoring capabilities for every
segment on the network. Because
RMON intelligence is integrated into
the connectivity modules, RMON
functionality scales easily as your
network grows. An RMON module
is also available for Token Ring.
A single management module
manages the entire multi-technology
hub. Using 3Com’s Distributed
Management Architecture, manage-
ment functions are shared between the
management module and SmartAgent
management agents in the connectiv-
ity modules.
The hub’s unique, high-speed pas-
sive bus can support up to 17 separate
services at data rates up to 155 Mbps
each. This technology-independent bus
will also handle 100 Mbps Ethernet
and Asynchronous Transfer Mode
(ATM) in the future, without the need
to upgrade the chassis or backplane.
The LinkBuilder MSH does offer
a full range of workgroup switching
options. The LinkSwitch 1200
Ethernet-to-FDDI switching module
is available now, letting you place
servers on an FDDI ring while users
remain in Ethernet workgroups on
the floor. Switching modules are
also planned for Ethernet-to-ATM,
100BASE-T Fast Ethernet, and Token
Ring connectivity.
HUB CHASSIS
LinkBuilder MSH Chassis (3C18040)
LinkBuilder MSH Chassis with FDDI
Backplane (3C18041)
Each chassis comes with 11 slots that accom-
modate “smart” connectivity modules and an
optional Management Module. A single power
supply can be used; two provide resiliency.
Modules
POWER
375W Power Supply (3C18011)
525W Power Supply (3C18012)
Choose the 375W or the 525W power supply
to power the LinkBuilder MSH. Installing
two provides load-sharing resilience for
increased reliability.
MANAGEMENT
Management Module (3C18500)
Provides SNMP management of all technolo-
gies and workgroups in the hub using 3Com’s
Distributed Management Architecture.
ETHERNET MODULES
LinkBuilder MSH provides state-of-the-art
Ethernet support with connectivity modules
for the full range of media types and security
needs. Modules designated “smart” imple-
ment 3Com’s Distributed Management
Architecture.
13-Port 10BASE-T Repeater Module
(3C18120A)
Smart, secure module providing connections
for 12 UTP users via a Telco connector, with a
13th port for a transceiver interface module.
12-Port 10BASE-T Repeater Module
(3C18121A)
Smart, secure module providing connections
for 12 UTP users via RJ-45 connectors.
24-Port 10BASE-T Repeater Module
(3C18122A)
Smart, secure module providing connections
for 24 UTP users via two Telco connectors.
7-Port 10BASE-T Repeater Module
(3C18124A)
Smart, secure module providing connections
for six UTP users via RJ-45 connectors and
one optional transceiver interface module.
3C18500
3C18121A3C18120A 3C18122A 3C18140A3C18124A 3C18135A
®
Hub Chassis
Power Supplies
LinkBuilder Hub Configuration Guide 15
Fiber-Optic Repeater Module (3C18135A)
Smart, secure module providing connections
for six fiber users via ST connectors. Module
conforms to the 10BASE-FL standard.
6-Port Coax Repeater Module (3C18140A)
Smart, secure module providing connections
for six coax users via BNC connectors. Each
port has a separate switch to allow for inter-
nal segment termination.
EXPANSION MODULES
LinkBuilder MSH expansion modules cost-
effectively increase the number of available
ports. Media may be mixed for maximum
flexibility.
Fiber-Optic Expansion Module (3C18136)
Adds six fiber ST ports to a coax or fiber
repeater module.
Coax Expansion Module (3C18141)
Adds six coax ports to a coax or fiber
repeater module.
Transceiver Interface Expansion Module
(3C18146)
Equipped with slots for two Transceiver
Interface Modules (see page 19), cost-
effectively adding transceiver connections
for a variety of media to LinkBuilder MSH
coax or fiber repeater modules.
TOKEN RING MODULES
The LinkBuilder MSH lets you fully integrate
Token Ring LANs into your enterprise network
while maintaining a high degree of data
integrity.
UTP MAU Module (3C18200)
STP MAU Module (3C18201)
Connections for 12 UTP or STP users via
shielded RJ-45 connectors.
Advanced MAU Module (3C18202)
Connections for 12 UTP or STP users via
shielded RJ-45 connectors. UTP and STP
connections can be mixed on one module.
Module includes advanced reliability and
performance features.
STP RingBuilder Module (3C18241)
Provides Ring In/Ring Out (RI/RO) connections
and smart management for any number of
MAUs in the LinkBuilder MSH chassis.
DB-9 STP connectors.
Fiber RingBuilder Module (3C18240)
Provides Ring In/Ring Out (RI/RO) connections
and smart management routines for any
number of MAUs in the LinkBuilder MSH
chassis. ST fiber and DB-9 STP connectors.
RMON probe (3C18250)
Supports all ten groups for one Token Ring.
FDDI CONNECTIONS
The LinkBuilder MSH provides high-speed
FDDI concentration in both fiber-optic and
UTP copper modules.
FDDI Fiber-Optic Module (3C18300)
Connections for four single-attached
workstations via fiber MIC connectors.
CDDI UTP Module (3C18301)
Connections for six single-attached work-
stations via UTP FDDI RJ-45 connectors.
FDDI RingBuilder Module (3C18310)
Forms a single FDDI ring from multiple
LinkBuilder MSH FDDI concentrator modules
using the hub’s backplane.
FDDI Fiber MIC Media Module (3C18320)
Lets you set up a link to an external ring, or
two links for resilient dual-attach or dual-
home FDDI configurations.
BRIDGING
4-Port Ethernet Bridge Module (3C18600)
Local Ethernet bridge with three internal ports
for workgroup connections to the hub back-
planes and one external port for a backbone
connection via a transceiver interface module.
Supports Spanning Tree Algorithm and a full
range of user-configurable filter options.
2-Port Token Ring Bridge Module
(3C18620)
Local 4/16 Mbps SRT Token Ring bridge with
one internal port for a workgroup connection
and one port that is switchable between a
second internal Token Ring or an external
connection with DB-9 RI/RO connectors.
SWITCHING
LinkSwitch 1200 Module (3C18640)
Provides frame switching between the hub’s
three Ethernet buses and FDDI. Can connect
to the internal FDDI backplane or optional
interfaces for external single- or dual-
attached FDDI rings.
LinkSwitch Expansion Module (3C18645)
Connects six additional switched UTP
Ethernet segments or high-performance
workstations to the hub’s three Ethernet
backplanes and FDDI.
3C18200 3C18201 3C18202 3C18241 3C18240 3C18650
3C18136 3C18141 3C18146
3C18300 3C18301 3C18310
3C18320
3C186203C18600
3C18640 3C18645
16 LinkBuilder Hub Configuration Guide
LinkBuilder FMS II
LinkBuilder FMS II stackable hubs
provide media flexibility, manage-
ability, and economy, with an unbeat-
able list of features that includes
bridging, built-in resilient links, and
optional redundant power supplies.
With LinkBuilder FMS II, you
create a single- or mixed-media
Ethernet stack with 12-port and
24-port RJ-45 twisted-pair, 24-port
Telco twisted pair, and 6-port ST
fiber hubs. You can also integrate the
LinkBuilder FMS coaxial hub with
a LinkBuilder FMS II mixed media
stack. These hubs keep your initial
investment low, letting you increase
port density and add bridging and
comprehensive SNMP management
when you need it.
LinkBuilder FMS II hubs work
with 3Com’s innovative SuperStack
systems, allowing you to easily inte-
grate hubs, bridges, routers, switches,
and redundant power, managing
them as a single system.
Hubs
12-Port TP Hub (3C16670)
Provides 12 shielded RJ-45 twisted-pair
connectors, along with a standard AUI
port or a slot for a slide-in transceiver
interface module.
Fiber Hub (3C16665)
Provides six ST fiber connectors, along
with a standard AUI port and a slot for a
slide-in transceiver interface module.
Telco Hub (3C16672)
Provides two 50-pin Telco connectors,
along with a standard AUI port and a slot
for a slide-in transceiver interface module.
24-Port TP Hub (3C16671)
Provides 24 shielded RJ-45 twisted-pair
connectors, along with a standard AUI
port and a slot for a slide-in transceiver
interface module.
LinkBuilder FMS Coaxial Hub (3C1625-0)
Provides 10 BNC coaxial ports along
with a standard AUI port and a slot for
a slide-in transceiver interface module.
(Not shown.)
LinkBuilder FMS II Stack (back view)
LinkBuilder FMS II
Management Module
Redundant Power System connector
Standard
AUI port
3C16671
LinkBuilder
Bridge
MicroModule
Transceiver Interface
Module for backbone
connections (BNC,
ST Fiber, TP, AUI)
Separate resilient
power supply
Expansion
cable
3C16665
3C16672
3C16670
LinkBuilder FMS II Stack (front view)
LinkBuilder Hub Configuration Guide 17
LinkBuilder FMS II Hub
Stacking Rules
LinkBuilder FMS II hubs can be linked
together to form a stack, or users can
mix LinkBuilder FMS II or LinkBuilder
FMS hubs in a stack. Here are some
stacking rules for common configurations.
1. Up to eight LinkBuilder FMS II hubs
can be stacked in a managed or
unmanaged configuration to form
a single logical repeater.
2. Unmanaged LinkBuilder FMS or
LinkBuilder FMS II hubs can be
placed in any position in the stack.
3. A LinkBuilder FMS II Management
Module (3C16630) or LinkBuilder FMS
Management Module (3C1603-0)
can be used to manage a stack of
LinkBuilder FMS II or LinkBuilder FMS
hubs. (Management module software
version 2.0 or greater is required.)
4. Managed LinkBuilder FMS hubs can
be mixed with LinkBuilder FMS II
hubs, providing they are in positions
1 through 4 in the stack.
5. A combination of LinkBuilder FMS II
twisted-pair, telco, and fiber hubs can
be placed in any position in a stack.
Diagram A
LinkBuilder FMS Management Module
installed in LinkBuilder FMS hub
LinkBuilder FMS
Management Module
(3C16030)
LinkBuilder FMS II
Management
Module
(3C16630)
LinkBuilder Bridge
MicroModule (3C16060)
Diagram B
LinkBuilder FMS II Management Module
installed in LinkBuilder FMS II hub
Modules
Management Module (3C16630)
User-installable SNMPmodule that
can be added to any hub in the stack
at any time. A single module man-
ages the entire stack, supporting in-
band management from an SNMP
management station over IP or IPX,
via a telnet session, or out-of-band
using the local port, a modem, or
Serial Line Interface Protocol (SLIP)
over a remote serial connection.
Bridge Management Module
(3C16040)
User-installable module that pro-
vides local bridging, bridge manage-
ment, and hub management for all
LinkBuilder FMS II hubs. Lets you
segment the network, manage both
hub and bridge operation, and run
Spanning Tree Algorithm (STA) for
redundant links.
Bridge MicroModule (3C16060)
User-installable, unmanaged, self-
learning local bridge that slides into
the transceiver interface module
slot of a LinkBuilder FMS II hub.
Provides low-cost, simple bridging
in situations where management is
not needed.
Transceiver Interface Modules
See page 19 for details.
Power Options
Redundant Power System
(3C565047)
Provides two load-sharing bulk
power supplies fed by independent
AC lines. Either of the two supplies
can support up to four LinkBuilder
FMS II hubs or other units in a
SuperStack system.
1. LinkBuilder FMS
2. LinkBuilder FMS
3. LinkBuilder FMS
4. LinkBuilder FMS II
5. LinkBuilder FMS II
6. LinkBuilder FMS II
7. LinkBuilder FMS II
8. LinkBuilder FMS II
1. LinkBuilder FMS II
2. LinkBuilder FMS
3. LinkBuilder FMS
4. LinkBuilder FMS
5. LinkBuilder FMS II
6. LinkBuilder FMS II
7. LinkBuilder FMS II
8. LinkBuilder FMS II
18 LinkBuilder Hub Configuration Guide
LinkBuilder FMS TR
LinkBuilder FMS TR hubs combine
RMON-based management with the
most advanced physical layer support
in an affordable, expandable platform
for mission-critical Token Ring
networks.
The hubs provide an array of
Token Ring features unmatched in
the industry—including advanced
Zero Delay Lockout and Distributed
Recovery Intelligence error recovery
and fault isolation technologies,
Phase-Locked Loop retiming mech-
anisms, and sophisticated
SNMP
RMON
network management.
For connectivity in a central wiring
closet, cascade connectors can link up
to 20 hubs in one rack—up to 260
users in all. Ring In/Ring Out mod-
ules allow main ring connections to
20 hubs in different locations up to
660 feet (200 meters) apart.
LinkBuilder FMS TR is part of
3Com’s innovative SuperStack sys-
tem, allowing you to easily integrate
hubs, bridges, routers, switches,
SDLC
conversion devices, and redundant
power into a single, manageable stack.
Hubs
12-Port Hub (3C510500)
Provides 13 RJ-45 twisted-pair ports,
along with two DB-15 cascade connec-
tors and a cascade cable. Hub has slots
for management and RI/RO expansion
modules.
24-Port Hub (3C510501)
Provides 25 RJ-45 twisted-pair ports,
along with two DB-15 cascade connec-
tors and a cascade cable.
Modules
RMON Management Agent Module
(3C510502)
User-installable SNMPRMON module
that adds a network analyzer level of
management to the LinkBuilder FMS
TR hubs. Slides into the LinkBuilder
FMS TR 12-port hub only; includes
an RS-232 DB-9 serial port.
Advanced RMON Management Agent
Module (3C510505)
User-installable SNMP RMON
module that supports all ten groups of
the Token Ring RMON specification.
Slides into the LinkBuilder FMS TR
12-port hub only; includes an RS-232
DB-9 serial port.
Fiber RI/RO Module (3C510503)
Slide-in module providing Ring In/Ring
Out expansion to multiple wiring closets.
Module has two pairs of fiber ST con-
nectors and slides into the LinkBuilder
FMS TR 12-port hub only.
Copper RI/RO Module (3C510504)
Slide-in module providing Ring In/Ring
Out expansion to multiple wiring closets.
Module has two RJ-45 ports and slides
into the LinkBuilder FMS TR 12-port
hub only.
Copper/Fiber RI/RO Module (3C510506)
Slide-in module providing Ring In/Ring
Out expansion to multiple wiring closets.
Module has one RJ-45 port and one pair
of fiber ST connectors and slides into the
LinkBuilder FMS TR 12-port hub only.
Accessories
Hub Expansion Cascade Cable (spare)
(3C510507)
8-Foot Redundant Ring Cascade Cable
(3C510508)
Power Options
Redundant Power System (3C565047)
Provides two load-sharing bulk power
supplies fed by independent AC lines.
Either of the two supplies can support
up to four LinkBuilder FMS TR hubs
or other units in a SuperStack system.
LinkBuilder FMS II TR Stack
3C510500
3C510501
3C565047
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3com LinkBuilder FMS II Hub Configuration manual

3com
Brand
3com
Model
LinkBuilder FMS II Hub
Category
Network switch modules
Type
Configuration manual
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