Black Box LH8112A, LH8124A, LH8112A-S User Manual
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10/100 MANAGED HUB
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10/100 Managed Hub
10/100 Managed Hub
10/100 Managed Hub
10/100 Managed Hub
10/100 Managed Hub
JUNE 1999
LH8112A
LH8124A
LH8112A-S
LH8124A-S
MDI-II
MDI-II
MDI-II
Installation & User Guide
CUSTOMER
SUPPORT
INFORMATION
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
© 1999 Black Box Corporation All rights reserved. Printed in USA.
Black Box and the Black Box logo are registered trademarks of Black Box Corporation.
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This publication is protected by the copyright laws of the United States and other countries, with
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manufacturer is not responsible for errors or omissions and reserves the right to change
specifications at any time without notice.
Table of Contents
10/100 Managed Hub
Installation & User Guide
Introduction ...............................................................................................7
Unpacking the 10/100 Managed Hub......................................... 7
Overview ....................................................................................7
Key Features............................................................................... 9
Front Panel Overview............................................................... 12
Clients................................................................................... 12
LED Indication ............................................................... 13
Master Units .........................................................................15
Rear Panel Overview................................................................16
Installation ............................................................................................... 17
Choosing a Location................................................................. 17
1
Stacking ...................................................................................17
Rack Mounting ......................................................................... 17
Using Cascade Cables ..............................................................17
Constructing a Management Stack...........................................18
Position Within the Stack ..................................................... 18
Master Hub Role .................................................................. 18
Client Hub Role....................................................................19
Hub ID..................................................................................19
Segmenting Hubs ................................................................. 19
Connecting Devices.............................................................. 19
Cables ................................................................................... 19
Workstations .........................................................................20
Connecting to Ethernet Hubs or Devices .................................20
Connecting to Fast Ethernet Switching Hubs and Devices ......21
Connecting to Other Dual Speed Hubs .................................... 21
Using Expansion Modules ...................................................................... 23
Expansion Module Overview...................................................23
2
Managing Through the Mini Console....................................................37
3
Internal Bridge Function ...................................................... 23
External Bridge Function ..................................................... 23
Backpressure (flow control) ................................................. 24
Installing a Bridge Module................................................... 24
TX Module LED Indicators ................................................. 26
FX Module LED Indicators.................................................. 27
Module LH8100C-2TX............................................................28
Module LH8100C-3TX............................................................30
Module LH8100C-2FX ............................................................ 32
Module LH8100C-3FX ............................................................ 34
Mini Console Overview ........................................................... 37
Features ...................................................................................37
VFD Display ............................................................................38
Observing Basic Port Information............................................ 38
Port Indicator Definition .......................................................... 39
Console Keys............................................................................ 39
Menu Tree ................................................................................ 40
Observing Network Traffic .................................................. 42
Selecting a Group ................................................................. 43
Monitoring Port Statistics..................................................... 44
Selecting a Port to Monitor ............................................. 45
Monitoring Port Detail Information ................................47
Monitoring All Ports Status............................................. 47
Monitoring Individual Port Status...................................49
Configuring Ports .................................................................50
Configuring All Ports ...................................................... 50
Configuring a Single Port................................................ 51
Unit Configuration ............................................................... 52
Configuring the Unit ....................................................... 53
4 10/100 Managed Hub
Locking the Mini Console ...............................................53
Unlocking the Mini Console ........................................... 54
Network Configuration ........................................................55
IP Address Configuration ................................................ 55
Subnet Mask .................................................................... 57
Default Gateway..............................................................57
Out-of-Band Configuration ............................................. 57
Securing the Hub ...................................................................... 57
Setting the Password ....................................................... 57
Cancelling the Password ................................................ 58
In case You Forget the Password....................................58
Restarting the Hub....................................................................59
Restoring the System Default Setup......................................... 59
System Information Menu........................................................60
Master Hub Configuration & Console Management ............................ 61
Connecting the Console Interface ............................................ 61
Menu Convention ..................................................................... 62
4
Using the Console Program...................................................... 64
Logging In ............................................................................ 64
Main Menu ...........................................................................65
Monitoring System Information...........................................66
Setting Up for Management .....................................................68
Network Configuration ........................................................69
Local Console/Remote Telnet-Ethernet ............................... 69
Local Console/Remote Telnet-SLIP ..................................... 70
Serial Port Configuration .....................................................72
SNMP Community Setup ..................................................... 74
Trap Receiver Setup ............................................................. 76
Web-Based Management Configuration ..............................78
Trap Filter.............................................................................80
Controlling Devices.................................................................. 81
Repeater Group Control/Status ............................................ 82
Repeater Port Control/Status ................................................ 85
5
2/3 Port Bridge Module Control/Status................................87
Redundant Link Control.......................................................90
Security Intrusion .................................................................94
Monitoring the Network...........................................................96
Repeater Statistics Information ............................................97
Repeater Group Statistics Information ................................. 99
Repeater Port Statistics Information .................................. 101
Address Tracking Information............................................105
Address Search Information...............................................107
Broadcast Storm Protection................................................109
Broadcast Storm Detected .................................................. 111
User Authentication................................................................ 112
System Utility......................................................................... 114
System Download .............................................................. 115
System Restart.................................................................... 116
Factory Reset ...................................................................... 118
Login Timeout Interval....................................................... 119
Configuration Upload Setting ............................................ 120
Configuration Upload Request/Status ................................ 121
SNMP Management ............................................................... 122
Technical Information ........................................................................... 123
Product Specifications............................................................123
Agency Compliance ...............................................................126
5
RFI Statements .......................................................................126
Appendix ................................................................................................ 129
Mini Console Menu Tree........................................................ 129
Troubleshooting the Network................................................. 130
6 10/100 Managed Hub
Introduction
Unpacking the 10/100 Managed Hub
Check that the following components have been included:
• 10/100 Managed Hub
• Rack Mount Bracket and Hardware
• Rubber Feet
• Cascade Cable
• Power Cord
• Installation & User Guide (this manual)
Your order has been provided with the safetest possible packaging. Inspect
it carefully. If you discover any shipping damage, notify the carrier and
follow their instructions for damage and claims. Be sure to save the
original shipping carton if return or storage of the unit is necessary.
Overview of the 10/100 Managed Hub
The 10/100 Managed Hubs are auto sensing, dual speed, manageable and
stackable hubs. The 10/100 Managed Hub series consists of masters and
managed clients with 12 or 24 ports. The features and functions of the 10/
100 Managed Hub series makes it a powerful, cost-effective solution for
large campus networks and rapid growth companies.
All models in the 10/100 Managed Hub series accept slide-in expansion
modules, adding more power and versatility , such as: bridging 10Mbps and
100Mbps segments and extending distances up to 2 kilometers.
10/100 Managed Hub LH8112A/LH8112A-S
The twelve port models are the LH8112A (master) and the LH8112A-S
(client).
The LH8112A master model shown below includes a Network
Management Unit (NMU), Mini Console, 12 dual-speed auto sensing
ports, 2 MDI-II ports and a switch module expansion slot.
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Introduction 7
MDI-II
The LH8112A-S managed client model shown below, includes an LED
panel, 12 dual-speed auto sensing ports, 2 MDI-II ports, and a switch
module expansion slot. The LH8112A-S can be fully managed by any
master model.
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10/100 Managed Hub (LH8112A-S) 12-port Client
10/100 Managed Hub LH8124A/LH8124A-S
The twenty-four port models are LH8124A (master) and LH8124A-S
(client).
The LH8124A master model shown below includes a Network
Management Unit (NMU), Mini Console, 24 dual-speed auto sensing
ports, 2 MDI-II ports and a switch module expansion slot.
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10/100 Managed Hub (LH8124A) 24-port Master
10/100 Managed Hub
The LH8124A-S client model shown below includes an LED panel, 24
dual-speed auto sensing ports, 2 MDI-II ports, and a switch module
expansion slot. The LH8124A-S can be fully managed by any master hub
model.
MDI-II
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8 10/100 Managed Hub
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10/100 Managed Hub
Key Features
The 10/100 Managed Hub series has many advanced features:
10/100Mbps Auto Sensing Ports
All ports in the 10/100 Managed Hub series are dual speed auto sensing,
including the MDI-II ports. Hubs automatically detect the transmission
speed and set the port accordingly.
Stackability
Every model in the 10/100 Managed Hub series is compatible, and can be
configured in the same stack with up to 6 hubs, using cascade cables.
Expansion Slots
Every model in the 10/100 Managed Hub series has one slot for adding
expansion modules, see below. The lower slot accepts switch expansion
modules. See Chapter 2: Using Expansion Modules for more information.
The upper slot is for the Network Management Unit (NMU) only.
Slot for Network Management Unit (NMU) only
Stackable
Up
Down
Expansion Module Slot
NMU
Switch/
Transceiver
Expansion Slot
Manageability
The 10/100 Managed Hubs provide extensive management capabilities
including: Mini Console Management for device level management,
Console Management using a VT-100 terminal emulator, Web-Based
Management using a Web Browser or SNMP network management.
• Mini Console Management
• Local Console/Remote Telnet
• Out-of-Band Management
• Web-Based Management
• SNMP Management
Introduction 9
AC LINE
100-240VAC
50-60Hz, 1.5A MAX
RMON Probe Capability
The Remote Network Monitoring (RMON) probe is an instrument that
exists for the purpose of managing a network. The goals of the RMON
probe are described in the following sections: Offline Operation, Proactive Monitoring, Problem Detection and Reporting, Value Added Data,
and Multiple Managers. The 10/100 Managed Hub supports RMON
group (1) statistics, group (2) History, group (3) Alarm, and group (9)
Event.
• Offline Operation: This allows a probe to be configured to
perform diagnostics and to collect statistics continuously,
even when communications with the management station
may not be possible or efficient.
• Proactive Monitoring: The monitor can notify the manage-
ment station of failure and can store historical statistical
information about the failure. The management station can
play this historical information back in an attempt to
perform further diagnosis into the cause of the problem.
• Problem Detection and Reporting: The monitor can be
configured to recognize conditions, most notably error
conditions, and to continuously check for them. When one
of these conditions occurs, the event may be logged, and
management stations may be notified in a number of ways.
• V alue Added Data: By highlighting those hosts on the
network that generate the most traffic or errors, the probe
can give the management station precisely the information
it needs to solve a class of problems.
• Multiple Managers: Remote monitoring can deal with
multiple management stations using its resources
concurrently.
10 10/100 Managed Hub
Redundant Link Capacity
Redundant links can be configured enabling up to 24 pairs in a hub. For
each pair of redundant links one port must be set as the primary and
active, the other as backup and isolated. If the primary port fails, it is
isolated and the backup port is set to primary and active.
Address Tracking Capability
The 10/100 Managed Hub provides MAC Address based tracking
capability for traffic analysis to diagnose network problems such as
Intrusion. This function records the source MAC address of each data
packet received by the port and provides the filter for data analysis. Up to
15 source MAC addresses can be detected on each port.
Source Address Search Capability
The 10/100 Managed Hub provides Source Address Search Capability.
This active address tracking capability is used to watch for a given MAC
address and report on which port it was seen. This capability can be used
to collect the necessary information for mapping the topology of a
network. Up to 8 MAC addresses can be searched simultaneously. You
can configure address search parameters including Source MAC address
and Address Search Status with local console management, Web-Based
Management or SNMP management.
Security Intrusion Control Capability
The 10/100 Managed Hub provides MAC Address based Security
Intrusion Control Capability to prevent any unauthorized nodes access to
the network. You can configure the hub to take various actions when a
violation is detected. Actions include: no action, sending a trap message
or partitioning a port.
Broadcast Storm Detection and Protection Capability
The 10/100 Managed Hub provides Broadcast Storm Detection and
Protection Capability by periodically monitoring the broadcast counters of
each port to detect a broadcast storm. Ports detected causing a broadcast
storm are automatically partitioned, a trap is sent to the network manager,
or no action is taken, depending on the configuration.
Introduction 11
Front Panel Overview: Clients
An LED panel, 12 dual-speed, auto sensing ports, switch module installed
LED, and 2 MDI-II shared ports are on the front panel of the unit.
See below.
An LED panel, 24 dual-speed, auto sensing ports, switch module installed
LED, and 2 MDI-II shared ports are on the front panel of the unit.
See below.
The Switch Module Installed LED is on if a switch module is installed in
the hub.
MDI-II Ports
LED Panel Hub ID
MDI-X Ports
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Front Panel LH8124A-S (24 Ports)
12 10/100 Managed Hub
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10/100 Managed Hub
LED Indication
The hub’s LEDs indicate status information for the device, its ports for
both segments (10Mbps and 100Mbps), and switch status.
LED Indicators 12 Port
Power
Collision
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Power
Collision
Forward
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Switch
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Int.
Int.
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LED Indicators 24 Port
• Power: The Power LED is on when the power cable is
plugged into the hub and a wall socket.
• Link/Rx: The Link/Rx LED is on for each connected port
and blinks for ports receiving transmissions.
• Collision: Collision LEDs indicate collision for either
segment (10Mbps and 100Mbps). If there is collision in a
segment the LED for that segment is on.
• Forward: Packet forwarding is active via the switch module
connecting both 10Mbps and 100Mbps domains. Forward
LED indicates the packet forward status through the switch
modules. Forward for both segments (10Mbps and
100Mbps) is indicated in the table on the next page.
Introduction 13
Forwarding LED* indicator meaning
Forward Status Int Ext Meaning
LED Switch Switch
100M On On Off A 10Mbps transmission
100M On Off On A 10Mbps transmission
10M On On Off A 100Mbps transmission
10M On Off On A 100Mbps transmission
100M On On On A 10Mbps transmission
10M On On On A 100 Mbps transmission
being received by
100Mbps segment
through the internal switch
being received by
100Mbps segment through
the external switch
being received by 10Mbps
segment through the
internal switch
being received by 10Mbps
segment through the
external switch
being received by 100Mbps
segment through the internal
switch and through the
external distance extender
(Modules LH8100C-3TX
and LH8100C-3FX only)
being received by 10Mbps
segment through the internal
switch and through the
external distance extender
(Modules LH8100C-3TX
and LH8100C-3FX only)
*NOTE: Collision LED is amber. All other LEDs are green.
14 10/100 Managed Hub
• Internal Switch (Bridge): The Internal Switch LED is
always on when the internal switch (bridge) function is
active and forwarding the data.
• External Switch (Bridge): The External Switch LED is on
when data is being forwarded from one segment to another
segment through the external switch port.
• Hub ID: Each linked hub is automatically assigned a hub
ID number and this number is indicated in the ID indicator.
Front Panel Overview: Master Units
The front panel for model LH8112A supports the Mini Console, switch
module installed LED, 12-10/100 ports, and 2-MDI-II ports.
The front panel for model LH8124A supports the Mini Console, switch
module installed LED, 24-10/100 ports, and 2-MDI-II ports.
The Switch Module Installed LED is on if a switch module is installed.
MDI-II PortsConsole Keys
Mini Console
Hub ID
ID
MDI-X Ports
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10/100 Managed Hub
Front Panel 10/100 Managed Hub LH8112A (12 Port)
Front Panel 10/100 Managed Hub LH8124A (24 Port)
Introduction 15
Mini Console
The Mini Console is a high definition display with console keys that
enables you to easily monitor and configure the system. The Mini
Console provides watch diagnostic functions, including port settings,
status monitoring, traffic utilization, collision, and error rate.
With the Mini Console, you can configure each device in a hub and all of
its ports. For more information see Chapter 3: Managing Through the
Mini Console.
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Mini Console
Rear Panel Overview
The rear panel of each hub in the 10/100 Managed Hub series supports
two expansion slots, two cascade ports and an AC power socket.
The cascade ports are used for cascading hubs (stacking hubs); the Up
port of one hub must be connected to the Down port of the other hub.
The AC power socket can be safely plugged into 100~240 VAC outlets.
Up Link
Stackable
Down Link
NMU Module Slot
Up
Down
Expansion Module Slot
Rear Panel Layout
AC Power Socket
NMU
Switch/
Transceiver
AC LINE
100-240VAC
50-60Hz, 1.5A MAX
16 10/100 Managed Hub
Chapter 1
Installation
Choosing a Location
The 10/100 Managed Hub location should be less than 100 meters from
servers, workstations, or switches. The 10/100 Managed Hub can be desk
mounted or rack mounted.
CAUTION: Category 5 UTP/STP cables are environmentally
sensitive. Make sure that the cable route is not too close to
electrical noise sources such as power lines or fluorescent lights.
Stacking
The 10/100 Managed Hubs are stackable in standard 19” racks. Up to six
hubs can be stacked with cascade cables. One master and up to five slaves
can make up a stack. The master can be positioned anywhere in the stack,
so you can add to a stack without re-positioning the hubs.
Rack Mounting
Rack mounting brackets are included to mount hubs in a standard EIA
19-inch racks.
Align the mounting brackets on the sides of the unit with the slit over the
holes. Secure the screws tightly to fix the brackets to the device. Then,
place the device into the 19” rack and affix it properly. Please ensure that
the ventilation holes on the unit are not blocked.
Using Cascade Cables
You can stack the 10/100 Managed Hubs using cascade cables. The
master hub can be placed anywhere in the stack. By cascading the hub
stack, each hub is automatically identified and assigned an ID number
according to its position in the stack.
Installation 17
Cascading hubs with cascade cables to make a stack is as simple as
connecting the Up port of one hub to the Down port of another hub as
illustrated below.
Stackable
Stackable
Stackable
Up
Down
Up
Down
Up
Down
NMU
Switch/
Transceiver
NMU
Switch/
Transceiver
NMU
Switch/
Transceiver
Cascade Ports
NOTE: To connect the cascade cable, the Up port on one hub connects to
the Down port of another hub.
Constructing a Management Hub Stack
A stack can be constructed with up to six hubs in total. One master hub
and up to five slave hubs can exist in one stack.
Position within the Stack
The master hub can be positioned anywhere in a stack and automatically
assigns the ID of each hub according to its position in the stack.
Master Hub Role
The master is used to manage and configure other hubs in the stack and
supplies the stack with additional ports (12/24) and an additional expansion module slot. The master hub can also be used as a stand-alone
intelligent hub. Managing the hubs can be accomplished with the master
hub’s versatile management capabilities, such as:
• Mini Console Management
Refer to Chapter 3: Managing Through the Mini Console
18 10/100 Managed Hub
• Console Management
Refer to Chapter 4: Console Management
• Web-Based Management
Refer to the Network Management Guide
• SNMP Management
Refer to the Network Management Guide
Client Hub Role
Client hubs supply the stack with additional ports (12/24) and an additional expansion module slot. Client hubs can be positioned above or
below the master hub. The LH8112A-S and LH8124A-S can also act as
stand alone unmanaged hubs.
Hub ID
The master hub and client hubs can be positioned anywhere in the stack
and each hub’s ID is automatically assigned based on its position (in the
stack).
Segmenting Hubs
The 10/100 Managed Hubs can isolate one or both segments (10 Mbps
and 100 Mbps segments) from the other hubs in a stack. When a segment
is isolated it does not repeat to the other segments in the hub or to other
segments in the stack.
Connecting Devices
The dual speed 10/100 Managed Hub can connect to 10Mbps, 100Mbps,
or 10/100Mbps devices due to its auto sensing capability. The 10/100
Managed Hub will auto sense the connected port speed and set its port to
match the speed of the connected port.
Cables
The 10/100 Managed Hub ports accept Cat 3, 4 and 5 cables with RJ-45
connectors for 10Mbps connections and Cat 5 cables with RJ-45 connectors for 100Mbps connections. The maximum length of cables, between
hub and workstations is 100 meters. The maximum length of cables,
between hub and hub is 5 meters for 100Mbps connections and 100
Installation 19
meters for 10Mbps connections. All ports are hot pluggable. It is recommended you label each cable to identify the device or port at each end.
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Shared Ports
10/100 Managed Hub
Shared Ports
Connecting Devices
Connecting Workstations
Install either a 10BASE-T or a 100BASE-TX Fast Ethernet Network
Interface Card into each workstation if not already installed. Using a
UTP/STP cable, connect the Ethernet card (in the workstation) to a hub
port.
Connecting Ethernet Hubs or Devices
Connect 10Mbps devices using UTP/STP Cat 3, 4 or 5 cables with RJ-45
connectors, enabling sending/receiving to or from other 10Mbps devices.
By default, each port is set in auto sensing mode. The 10/100 Managed
Hub can detect a 10BASE-T device and transmit/receive information
to/from it.
10/100 Managed Hub
Connecting Ethernet Hubs
20 10/100 Managed Hub
10Mbps
Connecting Fast Ethernet Switching Hubs
Connect 100Mbps devices using UTP/STP Cat 5 cables with RJ-45
connectors, maximum length 5 meters, enabling sending/receiving to
other fast Ethernet switching hubs. By default, each port is set to auto
sensing mode. The 10/100 Managed Hub can detect a connected
100BASE-TX device and transmit/receive information to/from it. The
distance between switching hubs can be extended up to 2km by connecting two hubs through expansion modules using fiber cable.
up to 2km Fiber
10/100 Managed Hub
100Mbps
Connecting Fast Ethernet Hubs
Connecting Other Dual Speed Hubs
Other dual speed hubs can be connected to the ports of the 10/100
Managed Hubs. Each port can auto sense the connected port speed and set
its speed to match the connected port. The maximum distance between
devices is 5 meters using Cat 5 UTP/STP cable. To increase the distance
between dual speed hubs you must use fiber cable and connect using an
expansion switch module. For more information about expansion switch
modules, refer to Chapter 2: Using Expansion Modules.
10/100 Managed Hub
10/100Mbps Hub 10/100Mbps Hub
Connecting Other Dual Speed Hubs to a 10/100 Managed Hub
Installation 21
22 10/100 Managed Hub
Chapter 2
Using Expansion Modules
Expansion Module Overview
Expansion modules provide additional functions such as internal bridging
of 10Mbps and 100Mbps segments and extended distances between
devices. The available modules are:
• Module LH8100C-2TX: 2 port Bridge or 10/100BASE-TX
Switch Module
• Module LH8100C-2FX: 2 port Bridge or 100BASE-FX
Fiber Distance Extender Switch Module
• Module LH8100C-3TX: 2 port Bridge and 10/100BASE-TX
Switch Module
• Module LH8100C-3FX: 2 port Bridge and 100BASE-FX
Fiber Distance Extender Switch Module
With the 10/100 Managed Hub, the software setting for Bridging Module
Admin State (external distance extender function and internal function) is
disabled by default. The Admin State of a bridge module must be configured using Console or Web-Based Management after installation.
Internal Bridge Function
The Internal Bridge Function is used for bridging 10Mbps and 100Mbps
segments in a hub or in a stack. Only one internal switch can be enabled in
a 10/100 Managed Hub, more than one will cause network looping.
IMPORTANT: There can only be one internal switch enabled in a 10/100
Managed Hub, however multiple external bridges are allowed. Therefore,
if more than one module exists in a 10/100 Managed Hub, ensure that only
one module has its internal bridge enabled.
External Bridge Function
The external bridge function is used to extend the distance between
100Mbps hubs or stacks from the normal limitation of five meters to one
hundred meters with TX modules using RJ 45 cable. With FX modules
using fiber cable, you can expand the distance between hubs or stacks up
to 2km.
Using Expansion Modules 23
Backpressure (flow control)
When packets are passed from 100Mbps segments to 10Mbps segments
the flow is restricted due to the lesser capacity of the 10Mbps segment
causing backpressure and resulting in dropped packets. With flow control
or backpressure enabled, packets are made to wait until the flow is
unrestricted before being sent, reducing the number of dropped packets.
Installing a Bridge Module
Power down the 10/100 Managed Hub before installing a bridge module.
Bridge modules have both hardware and software configuration settings.
The hardware configurations must be made before you physically install
the module and the software configurations must be made using a master
hub, after the module is installed and before the bridging functions take
effect. Please read this section carefully before installing modules.
IMPORTANT:
• These modules are not hot swappable. You must remove
power from the hub before installing or replacing a
bridge module.
• You should enable the internal bridge on only one bridge
module when you have multiple bridge modules installed
in a 10/100 Managed Hub. This prevents a network loop
condition.
• Three bridge modules are shipped with the Internal
Bridge function enabled (LH8100C-2TX, LH8100C-3TX
and LH8100C-3FX), only the LH8100C-2FX is shipped
with the Internal Bridge function disabled. All models
ship with the backpressure function disabled.
To install these modules, perform the following steps. Use static sensitive
precautions.
1. Set the bridge function and backpressure function by moving
the appropriate jumpers. See the following sections for the
bridge module model that you are installing and set the
jumpers accordingly.
24 10/100 Managed Hub
2. Remove the power from the hub by disconnecting the power
cable from the AC outlet.
3. Remove the installed bridge module or blank cover of the
expansion module slot (not the NMU slot, only the bottom
slot is available) by turning the two knobs on the front
counterclockwise as shown below.
Stackable
Up
Down
NMU
Switch/
Transceiver
AC LINE
100-240VAC
50-60Hz, 1.5A MAX
Removing the Blank Module Panel
4. Insert the new module, ensuring that the edges slide through
the guides, as shown below.
Stackable
Up
Down
Insert the Module
NMU
Switch/
Transceiver
AC LINE
100-240VAC
50-60Hz, 1.5A MAX
5. Turn the two knobs on the new bridge module until they are
securely attached to the hub.
6. Connect the appropriate communication cable to the new
module.
7. For stand alone client models the installation is complete,
just connect AC power.
8. If your adding this hub to an existing stack, connect the hub
to the stack. Refer to Chapter 1: Using Cascade Cables.
9. Reconnect the AC power cord to the wall outlet.
Using Expansion Modules 25
10. For a hub stack with a master present, you must configure
the software for the installed bridge module to enable the
internal bridge function because the software default setting
is disabled. The default software setting will not allow the
internal bridge function to enable. The software must be
configured using a master hub.
11. Start a Console or Web-Based Management session and set
the software configuration for the new module. For
information on starting a console session, refer to
Chapter 4: Console Management. For information on
Bridge Module configuration, refer to Chapter 4: Console
Management: Controlling Devices.
TX Module LED Indicators
The LEDs on each module indicate port activity. All LEDs are green.
• Link: On, indicates a link is up.
• TX: On, indicates a transmission in progress.
• RX: On, indicates receiving data.
• 100M: On, indicates the 100 Mbps segment is linked.
Off, indicates the 10 Mbps segment is linked
when TX or RX LED is also on. (NOTE: if there
is no cable connected to the module, the LED is
on by default.)
• FDX: On, indicates the port is set to full duplex.
Off, indicates the port is set to half duplex.
• Collision:On, indicates collision occurring.
Link up
Transmit
Receive
26 10/100 Managed Hub
2
3 Ports
Switch Module
LINK
TX
RX
TX Module LEDs
100M
FDX
COL
100Mbps Segment
Full Duplex
Collision
FX Module LED Indicators
The LEDs on each module indicate port activity. All LEDs are green.
• Link: On, indicates a link is up.
• TX: On, indicates a transmission in progress.
• RX: On, indicates receiving data.
• FDX: On, indicates the port is set to full duplex.
Off, indicates the port is set to half duplex.
• Collision:On, indicates collision occurring.
3 Ports
2
Switch Module
LINK
Link up
Transmit
Receive
TX
RX
FX Module LEDs
FDX
COL
Full Duplex
Collision
NOTE: Fiber Modules support 100Mbps only.
Using Expansion Modules 27
Module LH8100C-2TX
Module LH8100C-2TX is either an internal bridge for bridging the
internal 10Mbps and 100Mbps segments or an external 10/100BASE-TX
distance extender with MDI-X and MDI-II interfaces using an RJ-45
cable. Only one of these functions can be enabled at one time. The
internal or external bridge must be enabled or disabled with on board
jumpers before installation. Module flow-control (backpressure) can be
enabled or disabled by setting the on board jumpers before installation.
The default settings are as follows:
• Bridge Function setting: Internal (Default)
• Backpressure setting: Disabled (Default)
Module LH8100C-2TX Bridge Jumpers
The default jumper setting of the LH8100C-2TX module is internal
bridge enabled. To disable the internal bridge and enable the external
bridge, change the jumpers (JP1~JP16) from 1&2 to 2&3.
Jumpers JP1~JP16
• 1&2 connected = internal bridge is enabled (Default)
• 2&3 connected = external bridge is enabled
Module LH8100C-2TX Backpressure Jumpers
The default jumper setting for backpressure is disabled. To enable the
backpressure function, change JP18 jumper to 2&3.
Jumper JP18
• 1&2 =disabled (Default)
• 2&3 = enabled
2
3 Ports
Switch Module
LINK
100M
TX
FDX
COL
RX
28 10/100 Managed Hub
MDI-X
100BASE-TX
MDI-II
1-2 2-3
Disable Enable
2
3
1
JP18
JP18
Backpressure
2
3
1
JP16
JP15
JP14
JP13
JP12
JP11
JP10
JP9
JP8
JP7
JP6
JP5
JP4
JP3
JP2
JP1
2-3
SW
EXT
1-2
INT
SW
I
JP1
JP16
Jumpers: Module LH8100C-2TX
Using Expansion Modules 29
Module LH8100C-3TX
Module LH8100C-3TX is a 3-port bridge module with a two port internal
bridge for bridging 10Mbps and 100Mbps segments and an external
10/100BASE-TX distance extender with MDI-X and MDI-II interfaces
using an RJ-45 cable. Both of these functions can be enabled at one time,
in fact, the distance extender is always enabled. The internal or external
bridge must be enabled or disabled with on board jumpers before installation. Module flow-control (backpressure) can be enabled or disabled by
setting the on board jumpers before installation. The default settings are
as follows:
• Bridge Function setting: Internal and External enabled
(Default)
• Backpressure setting: Disabled (Default)
Module LH8100C-3TX Bridge Jumpers
The default jumper setting of the internal bridge of Module LH8100C3TX is enabled. The external distance extender is always enabled. To
disable the internal bridge, change the jumpers (JP2, J4 ~ JP6) from 2&3
to 1&2.
Jumpers JP2, JP4 ~ JP6
• 1&2 connected = internal bridge is disabled
• 2&3 connected = internal bridge is enabled (Default)
Module LH8100C-3TX Backpressure Jumpers
The default jumper setting for backpressure is disabled. To enable the
backpressure function, change JP1 and JP7 jumpers to 2&3.
Jumpers JP1, JP7
• 1&2 = disabled (Default)
• 2&3 = enabled
2
3 Ports
Switch Module
LINK
100M
TX
FDX
COL
RX
30 10/100 Managed Hub
MDI-X
100BASE-TX
MDI-II
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