Alcatel OS-6124 User manual

Part No. 060143-10, Rev. A
January 2002
OmniStack®6124
Getting Started Guide

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web page at www.ind.alcatel.com, call us at 1-800-995-2696, or email us at
[email protected].com.
This Manual documents OmniStack 6124 hardware and software.
The functionality described in this Manual is subject to change without notice.
Copyright©2002 by Alcatel Internetworking, Inc. All rights reserved. This document may not be
reproduced in whole or in part without the express written permission of Alcatel Internetworking,
Inc.
Alcatel®and the Alcatel logo are registered trademarks of Compagnie Financiére Alcatel, Paris,
France. OmniSwitch®and OmniStack®are registered trademarks of Alcatel Internetworking, Inc.
Omni Switch/Router™, SwitchExpertSM, the Xylan logo are trademarks of Alcatel Internetworking,
Inc. All other brand and product names are trademarks of their respective companies.
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Calabasas, CA 91301
[phone] FAX [phone]
[e-mail]
US Customer Support-[phone]
International Customer Support-[phone]
Internet-http://www.ind.alcatel.com

Warning
This equipment has been tested and found to comply with the limits for Class A digital
device pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions in
this guide, may cause interference to radio communications. Operation of this equipment
in a residential area is likely to cause interference, in which case the user will be required
to correct the interference at his own expense.
The user is cautioned that changes and modifications made to the equipment without
approval of the manufacturer could void the user’s authority to operate this equipment.
It is suggested that the user use only shielded and grounded cables to ensure compliance
with FCC Rules.
This digital apparatus does not exceed the Class A limits for radio noise emissions from
digital apparatus set out in the radio interference regulations of the Canadian
department of communications.
Le present appareil numerique níemet pas de bruits radioelectriques depassant les
limites applicables aux appareils numeriques de la Class A prescrites dans le reglement
sur le brouillage radioelectrique edicte par le ministere des communications du Canada.

i
Contents
Introduction 1
Installing the Switch 2
Package Contents 2
Description of Hardware 2
Mounting the Switch 3
Stacking Switches on a Flat Surface 3
Mounting Switches in a Rack 4
Installing a Management Module 4
Installing Optional Media and Stacking Modules 5
Connecting Stacking Modules across Multiple Switches 5
Installing a GBIC Transceiver 6
Connecting the Switch System 7
Making a Connection to an RJ-45 Port 7
Connecting to a 100BASE-FX Port 8
Connecting to a Gigabit Fiber Optic Port 8
Connecting to a 1000BASE-T Port 9
Powering On the Switch 10
Verifying Port Status 10
Verifying System Operation 11
Applications 11
Product Specifications 13
Base Unit 13
Physical Characteristics 13
Switching Criteria 13
Traffic Control 13
Modules 14
Management Module (OS-6124-MNGT-KIT) 14
100BASE-FX Module (OS-6ESM-100FM-2) 14
1000BASE-T Module (OS-6GSM-T-1) 14
1000BASE-SX Module (OS-6GSM-FM-1) 14
1000BASE-LX Module (OS-6GSM-FS-1) 15
GBIC Module (OS-6GSM-GBIC-1) 15
Stacking Module (OS-6STK-KIT) 15
Redundant Stacking Module (OS-6100-RST-KIT) 15
Troubleshooting 15
Diagnosing Switch Indicators 15
Power and Cooling Problems 16
Installation 16

Contents
ii
Port and Cable Assignments 17
RJ-45 Port Description 17
Straight-Through Wiring 17
Crossover Wiring 17
1000BASE-T Pin Assignments 18
1000BASE-T Cable Requirements 18
Cable Testing for Existing Category 5 Cable 18
Adjusting Existing Category 5 Cabling 18
EMI Certification 19
FCC Class A Certification (USA) 19
Canada Department of Communications - Class A 19
BSMI Class A (Taiwan) 19
VCCI Class A Compliance (Japan) 19
CE Mark Declaration of Conformance for EMI and Safety (EEC) 20
Safety Compliance 21
Warning: Fiber Optic Port Safety 21
Avertissment: Ports pour fibres optiques - sécurité sur le plan optique 21
Warnhinweis: Faseroptikanschlüsse - Optische Sicherheit 21
Underwriters Laboratories Inc. (USA) 21
Wichtige Sicherheitshinweise (Germany) 22
Optional Hardware 22

1
Introduction
The Alcatel OmniStack®6124 is perfect for moving workgroups from conventional
10 Mbps Ethernet to multiple-segment 100 Mbps Fast Ethernet, and for
consolidating your network equipment into a single, clean, efficient, and super-fast
switch stack. This switch system delivers dedicated 100 Mbps links to each attached
LAN segment (independent collision domain) or to any PC attached directly to the
stack – all with conventional cabling and adapters. It completely eliminates the
bottlenecks of shared 10 Mbps Ethernet networks by providing a wide bandwidth of
up to 8.8 Gbps per switch, and a stack backplane that can operate at up to
9.6 Gbps. This makes it ideal for increasing the throughput of interconnected
Ethernet and Fast Ethernet hubs or server farms.
This switch includes three slots on the rear panel for various modules:
• The upper slot is for an SNMP/RMON Management Module. The stack supports one
master and one backup management agent.
• The lower right slot is for optional media expansion modules, including a dual-port
100 Mbps fiber optic module that can be connected to a remote site up to
2 kilometers (1.24 miles) away, or a single-port Gigabit module that can be used to
uplink to a collapsed Gigabit backbone or for a high-speed server connection.
• The lower left slot is for either an optional media expansion module or Stacking
Module. (Up to six switch units can be stacked together using Stacking Modules.)
When the Management Module is installed, this system can provide a wide array of
advanced features:
• Master agent module manages entire stack in-band or out-of-band
• Backup agent module provides fault tolerance
• A fault-tolerant closed-loop stack architecture is supported with a Redundant
Stacking Module
• Supports Telnet, SNMP/RMON and Web-based interface
• Four-group RMON (including Statistics, History, Alarms and Events)
• Spanning Tree Algorithm for redundant paths between switches
• VLAN support for up to 256 groups, port-based or with 802.1Q VLAN tagging
• GVRP for automatic VLAN learning*
• IGMP multicast filtering
• Quality of Service supports two levels of priority with Weighted Fair Queueing
• Configurable broadcast storm control
• Port mirroring (for real-time debugging without affecting the target port)
• Port trunking (up to 5 trunks per switch or 12 trunks for the entire stack, each trunk
contains 2~4 ports)
* This feature is not supported in the current firmware release.
The Management Module allows you to configure or monitor the switch using the
embedded
management program or SNMP/RMON applications. To manage the
switch, you can
make a direct connection to the console port. You can also make a
network connection to manage the switch using Telnet, the on-board Web agent, or
any SNMP-based network management software.

OmniStack®6124
2
Installing the Switch
Before installing the switch verify that you have all the items listed under “Package
Contents.” If any of the items are missing or damaged, contact your local Alcatel
distributor. Also be sure you have all the necessary tools and cabling before
installing the switch. Note that this switch can be installed on any suitably large flat
surface or in a standard EIA 19-inch rack. After installing the switch, refer to the
Users Guide to set up its more advanced features, such as Spanning Tree Protocol
or VLAN port groups.
Package Contents
This package includes:
Description of Hardware
The base unit contains 24 10BASE-T/100BASE-TX ports, plus three slots on the
rear panel for various modules. A Management Module can be installed in the upper
slot on the rear panel (see page 3). The lower-left slot can be used for an optional
media expansion module or Stacking Module, while the lower-right slot can be used
for a media expansion module. Note that the media expansion modules include a
Fast Ethernet fiber optic module with two 100BASE-FX (SC type) ports or a one port
Gigabit 1000BASE-SX (SC type), 1000BASE-LX, 1000BASE-T, or GBIC uplink
module.
All RJ-45 ports on the base unit operate at 10 or 100 Mbps, and support
auto-negotiation of speed, duplex mode (i.e., half or full duplex), and flow control.
The 1000BASE-SX and 1000BASE-LX ports are fixed at 1000 Mbps but
auto-negotiate duplex mode. The 1000BASE-T auto-negotiates duplex mode and
auto-senses speed to 10/100/1000 Mbps. The 100BASE-FX module is fixed at the
100 Mbps, full duplex. All media types can auto-negotiate flow control.
Note that when using auto-negotiation, the speed, transmission mode and flow
control can be automatically set if this feature is also supported by the attached
device. Otherwise, these items can be manually configured for any connection.
The base unit also includes a display panel for key system and port indications that
simplify installation and network troubleshooting.
OmniStack®6124
• Four rubber foot pads • This Getting Started Guide
• Rack mount bracket kit • Release Notes
• AC power cord • Owner registration card
OmniStack®6124 Management Module Kit
• Management Module • This Getting Started Guide
• Console cable • Release Notes
• User Guide • Owner registration card

Installing the Switch
3
The following figure shows the components of this switch system:
Mounting the Switch
This switch can be placed directly on your desktop, or mounted in a rack.
Before you start installing the switch, make sure you can provide the right operating
environment, including power requirements, sufficient physical space, and proximity
to other network devices that are to be connected. Verify the following installation
requirements:
• Power requirements: 100 to 240 VAC (± 10%) at 50 to 60 Hz (± 3 Hz). The switch’s
power supply automatically adjusts to the input voltage level.
• The switch should be located in a cool dry place, with at least 10 cm (4 in.) of space
on the sides for ventilation.
• Place the switch out of direct sunlight, and away from heat sources or areas with a
high amount of electromagnetic interference.
• If you intend to mount the switch in a rack, make sure you have all the necessary
mounting screws, brackets, bolts and nuts, and the right tools.
• Check if network cables and connectors needed for installation are available.
Stacking Switches on a Flat Surface
The OmniStack®6124 can be stacked
anywhere there is enough flat space, such
as on a table or desktop.
1. Stick the self-adhesive rubber foot
pads (that come with this package) on
each of the 4 concave spaces located
on the bottom of the first switch.
2. Place the first switch on a firm flat surface where you want to install the stack.
3. Repeat step 1 for each switch before stacking them. The switch’s rubber foot
pads cushion the switch against shock/vibrations and provide space between
each switch for ventilation.
1
DC INPUT
VA
3.3 15
53
12 0.7
100-240V~ 50-60Hz 2A
stacking module can be installed in module 2 only
Module 2 Module 1
MNGT
Port Status
Indicators
10/100 Mbps
RJ-45 Ports
Power
Socket RPU
Connector
Module
Indicators Mode
Selection System
Indicators
Media or Stacking
Module Slot Media Module Slot Management Module Slot
1
1

OmniStack®6124
4
Mounting Switches in a Rack
Please comply with the following instructions to ensure that your switch is securely
mounted in the rack.
1. Use a standard EIA 19-inch rack.
2. Position the switch in the rack by lining up
the holes in the attached brackets with the
appropriate holes on the rack, and then
use the rack-mount screws to mount the
switch in the rack.
Installing a Management Module
One Management Module is required to manage all of the switches in the stack. One
other backup Management Module may also be installed in the stack to provide fault
tolerance. A Management Module only installs in a switch’s rear-panel upper slot, do
not try to install it in either of the two lower slots.
If you install a backup Management Module, it will automatically take over from the
master should it fail. The switch with the lowest stack unit ID will always act as the
master agent. For more information on switch management and the fail-over
process, see the OS-6124 Users Guide.
Note: A Management Module may be installed in any unit in the stack, but it is
suggested that the module be installed in the switch with the stack unit ID of “1.” In
a stack with no “closed-loop” (see “Connecting Stacking Modules across Multiple
Switches” on page 5), unit ID 1 will be the switch without a connection on the
Stacking Modules “UP” port. For a closed-loop stack, unit ID 1 will be the switch
that has the Redundant Stacking Module installed.
You can install a Management Module as described below:
1. Disconnect power to the switch (the modules are not hot-swappable).
2. Remove the face plate on the switch’s upper slot by removing the two screws
with a flat-head screwdriver.
3. Before opening the package that contains the module, touch the bag to the
switch casing to discharge any potential static electricity.
4. Remove the module from the anti-static shielded bag.
5. Holding the module level, gently push it all the way into the slot along the guide
rails, ensuring that it firmly engages with the connector.
6. If you are sure the module is properly mated with the connector, tighten the
retainer screws to secure the module in the slot.
Caution: The slide-in modules are not hot-swappable. Be sure you power off the switch
before installing any of these modules.
1

Installing the Switch
5
Installing Optional Media and Stacking Modules
The two lower slots on the rear panel of the switch are provided for various optional
media expansion modules (100BASE-FX or Gigabit) or Stacking Modules. The
100BASE-FX fiber optic module can be used to connect to remote sites, and a
Gigabit module can be used as a network backbone. You can install the media
expansion modules in either of the two lower slots, but the Stacking Module must
only be installed in the lower-left slot.
You can install a module as described below:
1. Disconnect power to the switch (the
modules are not hot-swappable).
2. Remove the face plate on the
appropriate slot by removing the two
screws with a flat-head screwdriver.
3. Before opening the package that
contains the module, touch the bag to
the switch casing to discharge any potential static electricity.
4. Remove the module from the anti-static shielded bag.
5. Holding the module level, gently push it all the way into the slot along the guide
rails, ensuring that it firmly engages with the connector.
6. If you are sure the module is properly mated with the connector, tighten the
retainer screws to secure the module in the expansion slot.
Caution: The slide-in modules are not hot-swappable. Be sure you power off the switch
before installing any of these modules.
Connecting Stacking Modules across
Multiple Switches
Plug one end of the stack cable (provided with the
package) in the “DOWN” port of the top unit and the other
end to the “UP” port of the next unit. Repeat this step for
each unit in the stack. Form a simple chain starting at the
Down port on the top switch and ending at the Up port on
the bottom switch (stacking up to six units).
The OS-6100-RST-KIT Redundant Stacking Module
allows you to configure a closed-loop architecture that
provides fault-tolerant operation of the stack. If a switch
or Stacking Module fails, the operation and management
of the stack remains unaffected. This also allows a switch
to be powered down and removed from a stack without
disrupting the rest of the stack.
UP DOWN
UP DOWN
UP DOWN
UP DOWN
OS-6100-RST-KIT
Redundant Stacking Module
OS-6STK-KIT
Stacking Module

OmniStack®6124
6
Note the following points about a closed-loop stack:
• The OS-6100-RST-KIT Redundant Stacking Module must be installed in the unit
that contains the master Management Module (Unit ID = 1). All other switches in
the stack can use the OS-6STK-KIT Stacking Module.
• To form a closed loop, connect the 1 m long stacking cable (included in the
Redundant Stacking Module kit) from the Up port on the top switch to the Down port
on the bottom switch.
• To enable the closed-loop function, be sure that the button on the panel of the
Redundant Stacking Module is fully pressed in. Use the tip of a pen or other sharp
object to achieve this.
Note: Do not leave one end of a stacking cable unconnected. Be sure both ends are
properly connected, or remove the cable entirely.
Installing a GBIC Transceiver
The lower two slots on the rear panel can be
used for a single-port GBIC uplink module.
This module supports 1000BASE-SX, 1000BASE-LX and 1000BASE-LH 5 V GBIC
transceivers.
The 1000BASE-SX GBIC transceivers provide one short-wavelength (850 nm) Gigabit
port that can be used for a high-speed backbone or server connection. This port can
be connected to a site up to 220 m (722 ft) away with 62.5/125 micron multimode fiber
cable, or up to 500 m (1641 ft) with 50/125 micron multimode fiber cable.
The 1000BASE-LX GBIC transceivers provide one long-wavelength (1300 nm)
Gigabit port that can be used for a high-speed backbone or server connection. This
port can be connected to a site up to 5 km (16404 ft) away with single-mode fiber
cable.
The 1000BASE-LH GBIC transceivers provide one long-wavelength (1550 nm)
Gigabit port that can be used for a long-haul connection to a remote site. This port can
be connected to a site up to 70 km (43.5 miles) away with single-mode fiber cable.
Caution: Install only 5 V GBIC transceivers into the module slots.
You can install a GBIC transceiver as described below:
1. Insert the tranceiver with the SC connector facing out toward you. Note that the
transceiver is keyed so that it can only be installed in one orientation.
2. Press in on the transceiver’s side tabs, and gently slide it into the GBIC
interface slot until it clicks into place.
Notes: 1. GBIC transceivers are hot-swappable. You do not need to power off the
switch before installing or removing a transceiver.
2. For 64-byte frames, the GBIC module is known to drop a certain percentage
of traffic.
GBIC Module
TXRX
1000Base X

Installing the Switch
7
Connecting the Switch System
The OmniStack®6124 provides 24 RJ-45 ports on the base unit. Each of these ports
supports a connection to 10 Mbps Ethernet or 100 Mbps Fast Ethernet, and
supports full or half-duplex operation. The transmission speed for each port is
automatically set by the switch to match the highest speed supported by the
connected device. The transmission mode can be set for each port using
auto-negotiation (if also supported by the attached device). However, if the device
attached to any port on the switch does not support auto-negotiation, you can
manually configure the transmission mode via the console port on the rear panel, or
via an in-band connection (including Telnet, the Web agent or management
software).
Making a Connection to an RJ-45 Port
You can use straight-through twisted-pair cable to connect any RJ-45 (MDI-X) port
on the switch to any device that uses a standard network interface such as a
workstation or server, or to a network interconnection device such as a bridge or
router (depending on the port type implemented).
1. Prepare the network devices you wish to network. Make sure you have installed
10BASE-T or 100BASE-TX network interface cards for connecting to the
switch’s RJ-45 (MDI-X) station ports.
2. Prepare straight-through shielded or unshielded twisted-pair cables with RJ-45
plugs at both ends. Use 100-ohm Category 3, 4 or 5 cable for standard
10 Mbps Ethernet connections, or 100-ohm Category 5 cable for 100 Mbps
Fast Ethernet connections.
3. Connect one end of the cable to the RJ-45 port of the network interface card,
and the other end to any available RJ-45 port on the switch. All RJ-45 ports
support 10 Mbps and 100 Mbps Ethernet connections. When inserting an
RJ-45 plug, be sure the tab on the plug clicks into position to ensure that it is
properly seated. Using the switch in a stand-alone configuration, you can
network up to 24 end nodes.
Caution: Do not plug a phone jack connector into any RJ-45 port. This may damage the
switch. Instead, use only twisted-pair cables with RJ-45 connectors that
conform with FCC standards.
Notes: 1. When connecting to another compatible switch or hub, use straight-through
cable to connect to an MDI port on the other device. You may also attach to
MDI-X station ports at both ends if you use crossover cabling. (Refer to “Port
and Cable Assignments” on page 17 for a description of crossover cable.)
2. Make sure each twisted-pair cable does not exceed 100 meters (328 feet).
3. We advise using Category 5 cable for all network connections to avoid any
confusion or inconvenience in the future when you upgrade attached devices
to Fast Ethernet.
Restrictions on Cascade Length - The IEEE 802.3 standard recommends
restricting the number of hubs (i.e., repeaters) cascaded via twisted-pair cable to 4;
while IEEE 802.3u provides even stricter recommendations for Fast Ethernet.
Therefore, when cascading devices other than this switch, please refer to the
accompanying documentation for cascade restrictions. However, note that because

OmniStack®6124
8
switches break up the path for connected devices into separate collision domains,
you should not include the
switch or connected cabling in your calculations for
cascade length involving other devices.
Connecting to a 100BASE-FX Port
If you connect fiber cable to the
100BASE-FX module, be sure you use an
SC-type connector. When inserting the cable, be sure the tab on the plug clicks into
position to ensure that it is properly seated. If you use an SC-to-ST converter, run
cable from the Rx (Tx) port on the module to the Tx (Rx) port on the target device.
Note that the fiber optic ports operate only at 100 Mbps, full duplex. In this mode,
you can run a fiber optic link up to 2 kilometers (1.24 miles).
Caution: The media expansion modules are not hot-swappable. Be sure you power off
the switch before installing any of these modules.
Note: As a general rule, the length of fiber optic cable for a single switched link should
not exceed 2 kilometers (1.24 miles). However, budget constraints must also be
considered when calculating the maximum cable length for your specific
environment.
Connecting to a Gigabit Fiber Optic
Port
When connecting fiber cable to a Gigabit
fiber-optic port on the switch, be sure you
use an SC-type connector. Follow the steps
below.
Warning: This switch uses lasers to transmit signals over fiber optic cable. The lasers are
compliant with the requirements of a Class 1 Laser Product and are inherently
eye safe in normal operation. However, you should never look directly at a
transmit port when it is powered on.
1. Remove and keep the SC port’s rubber cover. When not connected to a fiber
cable, the rubber cover should be replaced to protect the optics.
2. Check that the fiber terminators are clean. You can clean the cable plugs by
wiping them gently with a clean tissue or cotton ball moistened with a little
ethanol. Dirty fiber terminators on fiber optic cables will impair the quality of the
light transmitted through the cable and lead to degraded performance on the
port.
3. Connect one end of the cable to the SC port on the switch and the other end to
the SC port on the other device. Since SC connectors are keyed, the cable can
be attached in only one orientation. When inserting the cable, be sure the tab
on the plug clicks into position to ensure that it is properly seated.
All the SC-type ports operate at 1000 Mbps with support for auto-negotiation of
duplex mode (full/half) and flow control. Also note the maximum length for
100BASE-FX Module TX TX
RX RX
TX RX
1000BASE-SX Module
GBIC Module
TXRX
1000Base X

Installing the Switch
9
1000BASE-SX and 1000BASE-LX fiber optic cable depends on the core size and
the rating of the cable, as shown in the following tables.
Connecting to a 1000BASE-T Port
To connect to a 1000BASE-T port, use
Category 5 or 5e cable. The maximum
cable length is 100m (328 feet). You
should test the cable installation for IEEE 802.3ab compliance. See “1000BASE-T
Cable Requirements” on page 18. Note that this module operates at 10, 100 or
1000 Mbps with support for auto-negotiation of duplex mode (full/half), speed, and
flow control.
There are 3 LEDs on the front panel of the 1000BASE-T module to indicate
communication speed. Their status is shown in the following table.
Maximum 1000BASE-SX Gigabit Ethernet Cable Length
Fiber Size Fiber Bandwidth Maximum Cable Length
62.5/125 micron
multimode fiber 160 MHz/km 2-220 m(7-722 ft)
200 MHz/km 2-275 m(7-902 ft)
50/125 micron
multimode fiber 400 MHz/km 2-500 m(7-1641 ft)
500 MHz/km 2-550 m(7-1805 ft)
Maximum 1000BASE-LX Gigabit Ethernet Cable Length
Fiber Size Fiber Bandwidth Maximum Cable Length
9/125 micron
singlemode fiber N/A 2 m - 5 km (7 - 16404 ft)
LED State Indication
10 On Communications have been set to 10 Mbps.
100 On Communications have been set to 100 Mbps.
1000 On Communications have been set to 1000 Mbps.
1000BASE-T
1000
100
10
X
1000BASE-T Module

OmniStack®6124
10
Powering On the Switch
1. Plug the power cord into the power socket on the rear of the switch, and the
other end into a power outlet. (If you have purchased a redundant power
supply, plug it into the “DC INPUT” receptacle on the rear of the switch.)
2. Check the LED marked Power on the front panel to see if it is on. The unit will
automatically select the setting that matches the connected input voltage.
Therefore, no additional adjustments are necessary when connecting it to any
input voltage within the range marked on the rear panel.
3. The switch performs a self-diagnostic test upon power-on. (Note that this test
takes several minutes to complete.)
Note: The unit supports a “hot remove” feature which permits you to connect or
disconnect twisted-pair or fiber cables without powering off the switch and without
disrupting the operation of the devices attached to the switch.
Verifying Port Status
Check each connection by viewing the port indicators on the base unit front panel.
Their staus is shown in the following table.
LED State Indication
System
Power On Switch is receiving power.
RDP On Redundant power unit on.
Mgmt On Management agent operational.
RJ-45 Ports
Link On Port has established a valid network connection.
Yellow Communications have been set to 10 Mbps.
Green Communications have been set to 100 Mbps.
Flashing Port has been manually disabled, or partitioned
by the system due to excessive errors.
Activity* On Traffic is passing through the port.
FDX* On Port has been set to full duplex.
FC* On Flow control enabled.
Module Ports
Status On A valid module is correctly installed in the slot.
Activity On Traffic is passing through the port.
* Use the Mode Select button to select LED display mode.

Installing the Switch
11
Verifying System Operation
Verify that the stack has at least one Management Module correctly installed and
operating. The “Mgmt” LED on the switch that contains the Management Module
should be on, indicating that the module is installed and operating correctly.
Verify that the stack connections are operating correctly. Each switch in the stack
has it’s own unique unit ID (a number from 1 to 6) displayed by the front-panel LCD
labeled “Switch ID.” The switch that contains the master Management Module and a
Redundant Stacking Module always has the unit ID “1.” If any switch in the stack
displays a flashing or unstable unit ID for more than 30 seconds, you should check
the following items:
• Reset the stack by powering off all switches and then powering them back on.
• Be sure that all Stacking Modules are correctly installed in each switch’s lower-left
slot and the stacking cables are properly attached.
Verify that any optional modules are installed correctly. The Module 1 or Module 2
“Status” LEDs on the switch panel should be on, indicating that the modules are
installed and operating correctly.
Verify that all attached devices have a valid connection. The switch monitors the link
status for each port. If any device is properly connected to the switch and
transmitting a link signal, the Link indicator will light up for the corresponding port. If
the Link indicator fails to light when you connect a device to the switch, check the
following items:
• Be sure all network cables and connectors are properly attached to the connected
device and the switch.
• See if your cable is functioning properly by using it for another port and attached
device that displays valid indications when connected to the network.
• Be sure no twisted-pair cable exceeds 100 meters (328 feet). 100 Mbps fiber cable
should be under 2 kilometers (1.24 miles). The maximum length for fiber optic
Gigabit connections is listed in the table on the preceding page.
Applications
This switch segments your network, significantly increasing both bandwidth and
throughput. Any port on the switch can be attached to a hub (a shared collision
domain) or provide a dedicated link to a single network device (such as a
workstation or server). When a port on the switch is connected to a hub (a 10 or 100
Mbps repeater), the bandwidth provided by that port is shared by all the devices
connected to the attached hub. However, when a port is connected to an end node
or to a device that breaks up the collision domain (e.g., another switch, bridge or
router), the attached device has access to the full bandwidth provided by that port.
Bridging Functions - This switch provides fully transparent bridging functions.
It automatically learns node addresses, that are subsequently used to filter and
forward all traffic based on the destination address. When traffic passes between
devices attached to the same shared collision domain, those packets are filtered
from the switch. But when traffic must be passed between unique segments (i.e.,

OmniStack®6124
12
different ports on the switch), the high-speed switching fabric forwards the packets
at near zero latency.
Switching Functions - Store-and-forward switching is used to forward traffic to
other ports. This scheme ensures data integrity and provides a clean data stream.
Flexible Configuration - This switch is not only designed to segment your network,
but also to provide a wide range of options in setting up network connections. It can
be used as a simple stand-alone switch; stacked up to four high; or connected with
standard repeater hubs, switches, or other network interconnection devices in
various configurations.
Media Expansion Options - You can use a Fast Ethernet fiber module to connect
to remote sites up to 2 kilometers (1.24 miles) away, or a Gigabit module to support
applications such as high-speed file servers, or for connecting to a collapsed Gigabit
backbone switch.
1
ES3526F
ES3526F
1
ES3526F
ES3526F
Switch at remote site
(via 100BASE-FX link)
10 Mbps
Hub Stack
OmniStack 6124
Stack
100 Mbps
Hub Stack
Servers
Collapsed Backbone
(via Gigabit link)
1
ES3526F
ES3526F
1
ES3526F
ES3526F
...
...

Product Specifications
13
Product Specifications
Base Unit
Physical Characteristics
Access Method CSMA/CD
Standards Conformance IEEE 802.3, IEEE 802.3u
Communication Rate 10/100 Mbps
Communication Mode Full or half duplex
Media Supported 10BASE-T - 100-ohm Category 3,4,5 twisted-pair cable
100BASE-TX - 100-ohm Category 5 twisted-pair cable
Number of Ports 24 RJ-45 100BASE-TX ports
Indicator Panel System: Power, RDP, Mgmt; Ports: link/speed/disabled/
partitioned, activity, duplex, flow control
Dimensions 440 x 285 x 64 mm (17.37 x 11.22 x 2.53 in.)
Weight 4.5 kg (9.92 lb)
Input Power Full range: 100 to 240 V (±10%), 50 to 60 Hz (±3 Hz)
Maximum Current 0.80 A
RMS
max.@110 V, 0.50 A
RMS
max.@240 V
Power Consumption 70 Watts max. @ 100-240 VAC
Heat Dissipation 239 BTU/hr max. @ 100-240 VAC
Temperature Operating: 0~50 °C / 32~122 °F
Storage: -40~70 °C / -40~158 °F
Humidity 5% to 95% (noncondensing)
Certification CE Mark
Emissions FCC Class A, VCCI Class A, CISPR Class A,
EN 61000-3-2/3
Immunity IEC 61000-4-2/3/4/5/6/11
Safety CSA/NRTL, TÜV/GS
Switching Criteria
Network Bridging Function Filtering, forwarding and learning
Switching Method Store-and-forward
Address Table 8K entries total
Queue Buffer 128K bytes per 10/100 Mbps port
2M bytes for 1000 Mbps port
Address Resolution Fast hashing scheme
Traffic Control
Flow Control Back pressure for half duplex
IEEE 802.3x for full duplex
Broadcast Suppression Broadcast traffic suppressed at configurable threshold

OmniStack®6124
14
Modules
Management Module (OS-6124-MNGT-KIT)
System Configuration Configuration via console connection to serial port or
via Telnet;
Web-based management via HTTP protocol to access
embedded management program;
Full-featured SNMP/RMON management using
network management software
Management Agent MIB support: MIB II (RFC1213), Bridge MIB (RFC
1493), Ethernet-like MIB (RFC1643), RMON MIB
(RFC1757), and Alcatel ’s private MIB
RMON Groups 1,2,3,9 (Statistics, History, Alarm, Event)
100BASE-FX Module (OS-6ESM-100FM-2)
Access Method CSMA/CD
Standards Conformance IEEE 802.3u 100BASE-FX
Communication Rate 100 Mbps
Communication Mode Full duplex
Media Supported 50/125 micron or 62.5/125 micron multimode fiber
Output Power Minimum: -19 dBm, Maximum: -14 dBm
Receiver Sensitivity Minimum: -33 dBm, Saturation: -14 dBm
Power Budget 19 dB
Number of Ports 2 100BASE-FX SC-type ports
Indicator Panel Included on base unit
1000BASE-T Module (OS-6GSM-T-1)
Access Method CSMA/CD
Standards Conformance IEEE 802.3ab
Communication Rate 10,100 or 1000 Mbps
Communication Mode Full or half duplex
Media Supported Category 5 or 5e twisted-pair cable
Number of Ports 1 1000BASE-T RJ-45 port
Indicator Panel Included on base unit, plus 10,100,1000 speed LEDs
1000BASE-SX Module (OS-6GSM-FM-1)
Access Method CSMA/CD
Standards Conformance IEEE 802.3z
Communication Rate 1000 Mbps
Communication Mode Full or half duplex
Media Supported 50/125 micron or 62.5/125 micron multimode fiber
Output Power Minimum: -9.5 dBm, Maximum: -4 dBm
Receiver Sensitivity Minimum: -20 dBm, Saturation: -3 dBm
Power Budget 16 dB
Number of Ports 1 1000BASE-SX (SC-type) port
Indicator Panel Included on base unit