METRObility Optical Systems 8124-01-M User Manual
Lancast
®
8112-01-M
8124-01-S
8112-01-S
8124-01-S
8112-01-S
CenturyStack
CenturyStack
CenturyStack
CenturyStack
CenturyStack
CenturyStack
®
8100 Managed Hub
10/100Mbps
®
®
®
®
Power
100M
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Int.
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Power
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Int.
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Power
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Int.
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MDI-II MDI-II
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MDI-II
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MDI-II MDI-II
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MDI-II
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Installed
1x 2x 3x 4x 5x 6x 9x8x7x 10x 11x 12x
10/100 Mbps Dual Speed Ethernet Hub
10/100 Mbps Dual Speed Ethernet Hub
10/100 Mbps Dual Speed Ethernet Hub
10/100 Mbps Dual Speed Ethernet Hub
10/100 Mbps Dual Speed Ethernet Hub
MDI-II
MDI-II
MDI-II
Installation & User Guide
Models: 8124-01-M / 8124-01-S
8112-01-M / 8112-01-S
© 1998-1999 METRObility Optical Systems, Inc. All rights reserved. Printed in USA.
This publication is protected by the copyright laws of the United States and other countries, with all rights
reserved. No part of this publication may be reproduced, stored in a retrieval system, translated, transcribed, or transmitted, in any form, or by any means manual, electric, electronic, electromagnetic,
mechanical, chemical, optical or otherwise, without prior explicit written permission of METRObility Optical
Systems, Inc.
Lancast and CenturyStack are registered trademarks of METRObility Optical Systems, Inc. All other
trademarks appearing in this manual are the property of their respective owners.
The information contained in this document is assumed to be correct and current. The manufacturer is not
responsible for errors or omissions and reserves the right to change specifications at any time without
notice.
Table of Contents
CenturyStack® 8100 Managed Hub
Installation & User Guide
Introduction ...............................................................................................7
Unpacking the CenturyStack 8100 Managed Hub ..................... 7
Overview of the CenturyStack 8100 Managed Hub .................. 7
Key Features............................................................................... 9
Front Panel Overview............................................................... 12
Managed Slaves.................................................................... 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 ..............................................................18
Constructing a Management Stack...........................................18
Position Within the Stack ..................................................... 18
Master Hub Role .................................................................. 19
Slave 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 8102-01-X ................................................................... 28
Module 8103-01-X ................................................................... 30
Module 8102-03-X ................................................................... 32
Module 8103-03-X ................................................................... 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 CenturyStack® 8100 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 ................................ 122
SNMP Management ............................................................... 122
Technical Information...........................................................................123
Product Specifications............................................................123
Agency Compliance ...............................................................126
5
RFI Statements .......................................................................126
Warranty & Servicing............................................................. 127
Appendix ................................................................................................ 129
Mini Console Menu Tree........................................................ 129
Troubleshooting the Network................................................. 130
6 CenturyStack® 8100 Managed Hub
Introduction
Unpacking the CenturyStack 8100 Managed Hub
Check that the following components have been included:
• 8100 Series 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 your 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 CenturyStack 8100 Managed Hub
The CenturyStack® 8100 Series Hubs are auto sensing, dual speed,
manageable and stackable hubs. The CenturyStack 8100 Series Managed
Hubs consist of masters and managed slaves with 12 or 24 ports. The
features and functions of the CenturyStack 8100 Managed Series makes it
a powerful, cost-effective solution for large campus networks and rapid
growth companies.
All models in the CenturyStack 8100 Series Managed Hubs accept slide-in
expansion modules, adding more power and versatility , such as: bridging
10Mbps and 100Mbps segments and extending distances up to 2 kilometers.
Dual Speed CenturyStack Managed Hub 8112-01-M/S
The CenturyStack twelve port models are 8112-01-M (master) and the
8112-01-S (managed slave).
The 8112-01-M 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.
®
TM
CenturyStack
8112-01-M
Dual Speed CenturyStack Hub 8112-01-M (Master with NMU)
Prev
ID
MDI-II
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Installed
1x 2x 3x 4x 5x 6x 9x8x7x 10x 11x 12x
10/100 Mbps Dual Speed Ethernet Hub
Introduction 7
MDI-II
8112-01-S
The 8112-01-S managed slave model shown below, includes an LED
panel, 12 dual-speed auto sensing ports, 2 MDI-II ports, and a switch
module expansion slot. The 8112-01-S can be fully managed by any
master model.
®
®
CenturyStack
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MDI-II
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10/100 Mbps Dual Speed Ethernet Hub
Dual Speed CenturyStack Hub 8112-01-S (Managed Slave)
Dual Speed CenturyStack Managed Hub 8124-01-M/S
The CenturyStack twenty-four port models are 8124-01-M (master) and
8124-01-S (managed slave).
The 8124-01-M 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.
MDI-II
®
®
8124-01-M
CenturyStack
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MDI-II MDI-II
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13x 14x 15x 16x 17x 18x 21x20x19x 22x 23x 24x
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1x 2x 3x 4x 5x 6x 9x8x7x 10x 11x 12x
Dual Speed CenturyStack Hub 8124-01-M (Master with NMU)
The 8124-01-S Managed Slave model shown below, includes an LED
panel, 24 dual-speed auto sensing ports, 2 MDI-II ports, and a switch
module expansion slot. The 8124-01-S can be fully managed by any
master hub model.
®
®
8124-01-S
CenturyStack
Collision
Forward
Power
100M
Switch
13 1415 16 17 18 1920 21 22 23 24
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ID
MDI-II MDI-II
13x 14x 15x 16x 17x 18x 21x20x19x 22x 23x 24x
Switch Module
Installed
1x 2x 3x 4x 5x 6x 9x8x7x 10x 11x 12x
Dual Speed CenturyStack Hub 8124-01-S (Managed Slave)
8 CenturyStack® 8100 Managed Hub
10/100 Mbps Dual Speed Ethernet Hub
10/100 Mbps Dual Speed Ethernet Hub
Key Features
The CenturyStack Dual Speed Managed Hub Series has many advanced
features:
10/100Mbps Auto Sensing Ports
All ports in the CenturyStack 8100 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 CenturyStack 8100 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 CenturyStack 8100 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 CenturyStack 8100 Series 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 CenturyStack 8100 Managed Series Hubs
support 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 CenturyStack® 8100 Managed Hub
Redundant Link Capacity
Redundant links can be configured enabling up to 24 pairs in a
CenturyStack. 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
CenturyStack 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
CenturyStack 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
CenturyStack 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
CenturyStack 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
8112-01-S
Front Panel Overview: Managed Slaves
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
10/100 Mbps Dual Speed Ethernet Hub
CenturyStack
®
®
Power
100M
Collision
Forward
Int.
Switch
123456788101112
10M
Ext.
Switch
Link/RX
ID
MDI-II
Switch Module
Installed
1x 2x 3x 4x 5x 6x 9x8x7x 10x 11x 12x
Switch Module Installed LED
MDI-II
®
®
8124-01-S
CenturyStack
Collision
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Power
100M
Switch
10M
Ext.
Switch
Int.
Link/RX
13 1415 16 17 18 1920 21 22 23 24
123456789101112
ID
MDI-II MDI-II
13x 14x 15x 16x 17x 18x 21x20x19x 22x 23x 24x
Switch Module
Installed
1x 2x 3x 4x 5x 6x 9x8x7x 10x 11x 12x
Front Panel 8112-01-S (12 Ports)
Front Panel 8124-01-S (24 Ports)
12 CenturyStack® 8100 Managed Hub
10/100 Mbps Dual Speed Ethernet 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
®
®
8112-01-S
8124-01-S
CenturyStack
CenturyStack
®
Power
Collision
Forward
®
Power
Collision
Forward
100M
100M
Int.
Switch
Int.
Switch
10M
10M
123456788101112
Ext.
Switch
13 14 15 16 17 18 19 20 21 22 23 24
123456789101112
Ext.
Switch
Link/RX
ID
Link/RX
ID
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 Of f A 10Mbps transmission
100M On Off On A 10Mbps transmission
10M On On Of f 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 8103-01-X and
8103-03-X only)
being received by 10Mbps
segment through the internal
switch and through the
external distance extender
(Modules 8103-01-X and
8103-03-X only)
*NOTE: Collision LED is amber. All other LEDs are green.
14 CenturyStack® 8100 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 8112-01-M supports the Mini Console, switch
module installed LED, 12-10/100 ports, and 2-MDI-II ports.
The front panel for model 8124-01-M 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
Hub ID
ID
MDI-X Ports
Prev
MDI-II
Next
Switch Module
Enter
Installed
1x 2x 3x 4x 5x 6x 9x8x7x 10x 11x 12x
10/100 Mbps Dual Speed Ethernet Hub
8112-01-M
CenturyStack
®
®
Mini Console
MDI-II
8124-01-M
CenturyStack
Switch Module Installed LED
®
®
Prev
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MDI-II MDI-II
Next
Enter
13x 14x 15x 16x 17x 18x 21x20x19x 22x 23x 24x
Switch Module
Installed
1x 2x 3x 4x 5x 6x 9x8x7x 10x 11x 12x
10/100 Mbps Dual Speed Ethernet Hub
Front Panel CenturyStack 8112-01-M (12 Port)
Front Panel CenturyStack 8124-01-M (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 CenturyStack
hub and all of its ports. For more information see Chapter 3: Managing
Through the Mini Console.
®
CenturyStack
®
K%123456789101112131415G-A
80
40
20
10
5
3
1
G-B
G-C
G-D
ID
Master
WWW
SNMP
O-O-B
Prev
Next
Enter
8124-01-M
Mini Console
Rear Panel Overview
The rear panel of each hub in the CenturyStack 8100 Series supports
2-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.
Up Link
Stackable
Down Link
Up
Down
NMU Module Slot
Expansion Module Slot
16 CenturyStack® 8100 Managed Hub
AC Power Socket
NMU
Switch/
Transceiver
AC LINE
100-240VAC
50-60Hz, 1.5A MAX
Chapter 1
Installation
Choosing a Location
The CenturyStack location should be less than 100 meters from servers,
workstations, or switches. The CenturyStack 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 CenturyStack Managed Series 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 CenturyStack 8100 Series 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: T o 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 CenturyStack 8100 Managed Hub
• Console Management
Refer to Chapter 4: Console Management
• Web-Based Management
Refer to the CenturyStack Network Management Guide
• SNMP Management
Refer to the CenturyStack Network Management Guide
Slave Hub Role
Slave hubs supply the stack with additional ports (12/24) and an additional expansion module slot. Slave hubs can be positioned above or
below the master hub. The 8112-01-S and 8124-01-S can also act as stand
alone unmanaged hubs.
Hub ID
The master hub and slave 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
CenturyStack 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 CenturyStack can connect to 10Mbps, 100Mbps, or
10/100Mbps devices due to its auto sensing capability. CenturyStack will
auto sense the connected port speed and set its port to match the speed of
the connected port.
Cables
CenturyStack 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 meters for
Installation 19
10Mbps connections. All ports are hot pluggable. It is recommended you
label each cable to identify the device or port at each end.
13x 14x 15x 16x 17x 18x 21x20x19x 22x 23x 24x
MDI-II MDI-II
Switch Module
Installed
1x 2x 3x 4x 5x 6x 9x8x7x 10x 11x 12x
Shared Ports
10/100 Mbps Dual Speed Ethernet 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
CenturyStack 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. CenturyStack can detect
a 10BASE-T device and transmit/receive information to/from it.
CenturyStack 81XX
10Mbps
Connecting Ethernet Hubs
20 CenturyStack 8100 Managed Hub
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. CenturyStack 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
CenturyStack 81XX
100Mbps
Connecting Fast Ethernet Hubs
Connecting the Other Dual Speed Hubs
Other dual speed hubs can be connected to the ports of the CenturyStack
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.
CenturyStack 81XX
10/100Mbps Hub 10/100Mbps Hub
Connecting Other Dual Speed Hubs to a CenturyStack Hub
Installation 21
22 CenturyStack 8100 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 8102-01-X: 2 port Bridge or 10/100BASE-TX
Switch Module
• Module 8102-03-X: 2 port Bridge or 100BASE-FX
Fiber Distance Extender Switch Module
• Module 8103-01-X: 3 port Bridge and 10/100BASE-TX
Switch Module
• Module 8103-03-X: 2 port Bridge and 100BASE-FX
Fiber Distance Extender Switch Module
With CenturyStack, 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 CenturyStack, more than one will cause network looping.
IMPORTANT: There can only be one internal switch enabled in a
CenturyStack, however multiple external bridges are allowed. Therefore,
if more than one module exists in a CenturyStack, 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 CenturyStack 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 CenturyStack. This prevents a network loop
condition.
• Three bridge modules are shipped with the Internal
Bridge function enabled (8102-01-X, 8103-01-X and
8103-03-X), only the 8102-03-X 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 CenturyStack 8100 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 slave 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.
2
Switch Module
LINK
Link up
TX
RX
Transmit
Receive
TX Module LEDs
26 CenturyStack 8100 Managed Hub
3 Ports
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 8102-01-X
Module 8102-01-X 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 8102-01-X Bridge Jumpers
The default jumper setting of the 8102-01-X 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 8102-01-X 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
MDI-X
28 CenturyStack 8100 Managed Hub
100BASE-TX
MDI-II
Jumpers: Module 8102-01-X
Using Expansion Modules 29
JP1
I
JP16
INT
SW
1-2
EXT
SW
2-3
JP1
JP2
JP3
JP4
JP5
JP6
JP7
JP8
JP9
JP10
JP11
JP12
JP13
JP14
JP15
1
Backpressure
2
3
JP16
JP18
1
2
3
JP18
Disable Enable
1-2 2-3
Module 8103-01-X
Module 8103-01-X 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 8103-01-X Bridge Jumpers
The default jumper setting of the internal bridge of Module 8103-01-X 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 8103-01-X 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
MDI-X
30 CenturyStack 8100 Managed Hub
100BASE-TX
MDI-II
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