D-Link DE-1824EI, SNMPT12, SNMPT12i, SNMPT24, SNMPT24i User Manual
10BASE-T Stackable Hubs
Intelligent Series
User’s Guide
Rev. 02w (Oct., 2004)
6SNMPT....01
Printed In Taiwan
RECYCLABLE
10BASE-T Stackable Hubs
FCC Warning
This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to Part 15 of th e 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 this user’s guide, may cause harmful
interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user
will be required to correct the interference at his own expense.
CE Mark Warning
This is a Class A product. In a domestic environment, this product may
cause radio interference in which case the user may be required to take
adequate measures.
ii Table of Contents
10BASE-T Stackable Hubs
TABLE OF CONTENTS
0 ABOUT THIS GUIDE..........................................................vi
Overview of the User's Guide................................................................... vi
1 INTRODUCTION ..............................................................1-1
Overview.................................................................................................1-1
Media Connection Flexibility...........................................................................1-1
Stackability and Manageability........................................................................1-2
Innovative Display ...........................................................................................1-2
Security ............................................................................................................1-2
Highlights...............................................................................................1-3
General Highlights of the Intelligent Series.....................................................1-3
2 EXTERNAL FEATURES AND INDICATORS...........................2-1
Front and Back Panel Layouts...............................................................2-1
Front Panel Indicators ...........................................................................2-3
3 SETTING UP THE HUB ....................................................3-1
Power and Environmental Requirements...............................................3-1
Power Connection ..................................................................................3-2
Free-standing Installation......................................................................3-3
Rack-Mounting.......................................................................................3-3
Installing the Transceiver Tray ..............................................................3-4
Table of Contents iii
10BASE-T Stackable Hubs
Replacing the Power Supply...................................................................3-5
4 BUILDING HUB STACKS..................................................4-1
Hub Roles ...............................................................................................4-1
Position Within the Stack.................................................................................4-2
Master Hub Roles.............................................................................................4-2
Slave Hub Roles...............................................................................................4-3
Hub ID..............................................................................................................4-4
Daisy-chaining Hubs into a Hub Stack ..................................................4-4
Segmenting Hubs....................................................................................4-5
5 NETWORK CONNECTIONS...............................................5-1
Connecting Stations to the Hub..............................................................5-1
Cascading Hub Stacks............................................................................5-3
Using Twisted-pair Cabling .............................................................................5-4
Using Thin Coaxial Cabling.............................................................................5-5
Using Fiber or Thick Coaxial Cabling .............................................................5-6
Multilevel Cascading........................................................................................5-6
6 USING THE CONSOLE INTERFACE....................................6-1
Connecting to the Hub............................................................................6-1
Console Usage Conventions...................................................................6-2
Logging in to the Hub Console...............................................................6-3
Logging In........................................................................................................ 6-3
Changing your Password..................................................................................6-5
Setting up the Master Hub......................................................................6-6
TCP/IP Settings................................................................................................6-6
Out-of-band management and console settings................................................ 6-9
Software Updates.............................................................................................6-9
SNMP Information.........................................................................................6-11
SNMP Traps...................................................................................................6-12
SNMP Security (Community Names)............................................................6-13
Adding and Deleting Users ............................................................................6-14
iv Table of Contents
10BASE-T Stackable Hubs
Hub Stack Configuration......................................................................6-16
Primary and Backup Master Hubs..................................................................6-16
Controlling Hubs in the Hub Stack ................................................................6-17
Controlling Individual Ports...........................................................................6-19
Segmenting Hubs ...........................................................................................6-23
Monitoring the Hub Stack ....................................................................6-24
Displaying Segment, Group, and Port Statistics.............................................6-21
Displaying Node Tracking Information .........................................................6-28
Resetting the Hub .................................................................................6-29
System Reset..................................................................................................6-29
Factory Reset..................................................................................................6-30
A SPECIFICATIONS .......................................................... A-1
B
POWER-ON SELF TEST ................................................ B-1
C
BOOT CONFIGURATION FILE ......................................... C-1
D
CABLES AND CONNECTORS .......................................... D-1
Crossover Cable....................................................................................D-2
Daisy-chain Cable.................................................................................D-3
RS-232 (DB9) Pin Specification............................................................D-3
0
Table of Contents v
10BASE-T Stackable Hubs
ABOUT THIS GUIDE
This User's Guide discusses how to use Intelligent 10BASE-T Stackable
Managed hubs. This series includes:
♦ the 12/24-port stackable managed master hub, and
♦ the 12/24-port standard hub.
In this User's Guide, the Intelligent Series stackable hubs are frequently
described simply as "hub" or "hubs" wherever the text applies to both
models. Model numbers are normally used only to differentiate between
models.
Overview of the User's Guide
The User's Guide is divided into the following chapters and their related
audiences:
♦ Chapter 1. Introduction
Describes the features of the Intelligent Stackable
Managed Hubs.
♦ Chapter 2. Indicators
Introduces the layout of the hub's front panel, rear
panel, and display indicators.
♦ Chapter 3. Setting up the Hub
Describes basic installation procedures for setting
up the hub.
♦ Chapter 4. Building Hub Stacks
vi Table of Contents
10BASE-T Stackable Hubs
Describes how to stack master and slave hubs into
an integrated hub stack.
♦ Chapter 5. Network Connections
Describes how to connect workstations to the hub,
and the hub to other hubs and network components
on a local area network.
♦ Chapter 6. Using the Console Interface
Describes how to configure the hub and a
manageable stack using the console program.
♦ Appendix A. Product Specifications
Provides information on the physical and electrical
specifications of the hubs.
♦ Appendix B. Power-On Self Test
Provides information about the POST messages
used for troubleshooting problems with the hub.
♦ Appendix C. Boot Configuration File
Describes the hub boot configuration file.
♦ Appendix D. Cables and Connectors
Describes the specifications of the cables and
connectors used with the hubs.
Table of Contents vii
10BASE-T Stackable Hubs
1
1 INTRODUCTION
The Intelligent Stackable Managed Hub Series lets you build a 10Mbps
Ethernet hub stack with full SNMP manageability, convenient setup, and an
unprecedented degree of flexibility. The Series allows you to turn your
network into the ideal connectivity solution by maximizing network
performance.
Overview
Important features of the Intelligent Series include:
Media Connection Flexibility
The Intelligent Series hubs support multiple Ethernet media types, with
twelve or twenty-four ports for twisted-pair cabling, and one AUI port which
provides connectivity for a variety of Ethernet wiring environments, from
basic workgroups to remote branch offices. An appropriate external
transceiver allows the AUI port to be used to connect to any type of Ethernet
medium.
Introduction 1-1
10BASE-T Stackable Hubs
Stackability and Manageability
A stack of Intelligent hubs can be separated up to 100 meters apart and still
keep their manageability. Up to 8 hubs can be daisy-chained together using
UTP or STP cable, with 7 client hubs sharing the master hub's SNMP
management agent, to provide a connectivity solution for departmental
Ethernet networks ranging up to 192 twisted-pair nodes. Bandwidth can be
substantially increased using micro-segmentation and LAN switching
technologies.
Innovative Display
Intelligent Series hubs are equipped with a large, clear display that shows an
extensive array of information at a glance, including link/receive and
partitioning status, bandwidth utilization, collision ratio, runt occurrences,
and data transmission errors.
Security
The Intelligent Series supports intrusion control. Intrusion Control prevents
unauthorized individuals from accessing the network. Through the network
management software, Ethernet addresses that represent authorized users can
be assigned to each hub port. If a packet is received from a port that contains
a source address from other than the authorized user, the port is disabled and
a notification is sent to the network manager.
1-2 Introduction
10BASE-T Stackable Hubs
Highlights
General Highlights of the Intelligent
Series
♦ Complies with the IEEE 802.3 10BASE-T, 10BASE2, 10BASE5, and
10BASE-FL standards.
♦ Twelve or twenty-four independent RJ-45 ports for Category 3, 4, 5
twisted-pair wiring (either UTP or STP) to nodes in a 10BASE-Tcompliant network.
♦ Switchable uplink port allows stacks of hubs to be easily cascaded
together to further expand the network.
♦ Twisted-pair hub stack daisy chain cabling
◊ Allows a total distance of 100 meters between the first hub and the
last hub in the daisy-chain.
◊ Expandable network capacity up to 8 hubs in a single stack for a
maximum of 192 ports (and 8 AUI ports).
♦ Recessed AUI connector in the rear of the unit:
◊ Accommodates most standard Ethernet transceivers.
◊ Allows the transceiver to be safely and conveniently tucked away.
◊ A custom tray is provided for easy insertion and removal of a
recessed transceiver or cable.
♦ Clear, easy-to-read front panel display provides comprehensive
diagnostic indication of network status, allowing managers to
diagnose and troubleshoot instantly.
Introduction 1-3
10BASE-T Stackable Hubs
♦ SNMP-View Network Management Program available for standard
SNMP-based management.
♦ Fully configurable either in-band or out-of-band using any SNMP-
based network management system.
♦ Flash EPROM for software upgradeability (downloadable from TFTP
Server. Initiate download request from either SNMP-View or an outof-band console).
♦ Automatic bad port partition, collision detection, and jabber
protection.
♦ Built-in removable power supply, replaceable without opening the
enclosure.
◊ Easily removed and replaced with a new one should damage
occur.
◊ Automatic voltage selection (100V-240V AC, 50-60Hz) without
fuse changes or manual voltage range settings.
♦ Slim profile, usable as a standalone desktop unit or as a rack
mountable unit.
♦ FCC Class A compliant.
♦ CE Mark compliant.
♦ VCCI Level 1 compliant.
♦ Hub IDs are automatically assigned during initialization or when
daisy chain links are changed.
♦ One RS-232 console port for out-of-band management. (Telnet
network management is also supported.)
The RS-232 serial communication port can be configured as either local
console or remote access through Telnet based on SLIP support, as well
as updating to the latest firmware via TFTP.
1-4 Introduction
10BASE-T Stackable Hubs
♦ Redundant Backup Management
◊
To maximize management uptime, two master hubs can be put in
the same stack. If the first one goes down, the backup hub can
automatically take over to provide uninterrupted traffic monitoring
and network control.
Introduction 1-5
10BASE-T Stackable Hubs
2
2 EXTERNAL FEATURES
AND INDICATORS
This chapter introduces the controls and connectors on the front and rear
panels of the hub, and explains the front panel display in detail.
Figures 2-1, 2-2 and 2-3 show the layouts of the front panel, rear panel, and
display of the stackable hubs. Note that there are variations in the
appearances of the front and back panels between hubs in the series. Only
the 24-port models are depicted in this User's Guide.
Front and Back Panel Layouts
Uplink Switch
10BASE-T Port
s
LED Panel
Figure 2 -1 Front Panel Layout
Setting Up the Hub 2-1
10BASE-T Stackable Hubs
AUI Connector
Daisy-chain Port
C
onsole Port
Removable Power Supply
Expansion Module Port
Figure 2 -2 Back Panel Layout
The following components are found on the front and back panels of the
hubs:
♦ Ethernet Ports
Used for connecting the hub to network devices using 10BASE-T
shielded or unshielded twisted-pair cable. The X label marked on each
port means the ports are MDI-X ports, which connect to workstations and
servers using straight-through cables and to other hubs using crossover
cables.
♦ Port 1 Uplink Switch
Converts port 1 to an uplink port to allow you to connect the hub to an
Ethernet switch or another hub with an ordinary straight-through cable
instead of a modified crossover cable.
♦ RS-232 Console Port (manageable models only)
Used to connect the master hub to a network management station for out-
of-band communication, or for simple management using the console
interface. The console port has a standard 9-pin RS-232 female
connector.
2-2 External Features and Indicators
10BASE-T Stackable Hubs
♦ AUI Port
Used when connecting the hub to a 10BASE5 "thick Ethernet" backbone,
or to other types of Ethernet media. The recessed AUI port
accommodates most standard transceivers (also known as Media Access
Units or MAUs), allowing the transceiver to be safely and conveniently
tucked away.
♦ Daisy-chain Port
The daisy-chain port consists of one set of two RJ-45 connectors. It
allows you to connect Intelligent hubs together into a stack of up to 8
hubs with a maximum of 192 10BASE-T ports.
♦ Expansion Module Port (manageable models only)
Used for adding optional expansion modules to the hub, such as the
10/100Mbps switch module.
Front Panel Indicators
Figure 2 -3 Indicator Display
External Features and Indicators 2-3
10BASE-T Stackable Hubs
The hub's front panel display features the following indicators:
♦ Port Status Indicators
Each of the ports has an LED status indicator for reporting its link and
activity status, and showing whether or not it has been partitioned.
The port status indicators always come on when the hub is powered on.
After the POST (Power-On Self Test) is completed, they normally go off.
The following describes each indicator and the meaning of each
condition:
◊ Link
The indicator of a port lights green when the port is connected to a
powered Ethernet station. If the station to which the hub is connected
is powered off, or if there is a problem with the link, th e indicator is
off.
◊ Receive
The indicator of a port blinks green when the port is currently
receiving packets on the connected segment. Upon reception, each
data packet will be transmitted through all other connected ports on
the hub (or in the hub stack).
◊ Auto-partition
The indicator of a port blinks amber when the port is automatically
partitioned due to an abnormal network condition.
A port is temporarily partitioned when too many line errors or too
many collisions are detected on the port. While the segment is
automatically partitioned, the port continues to receive data. However,
data is not transmitted out of the segment (from the port). When the
problem is corrected or a valid data packet is received from the port,
the port is automatically reconnected.
2-4 External Features and Indicators
10BASE-T Stackable Hubs
◊ Manual Partition
The indicator of a port lights amber continually when the port is
manually partitioned.
Manually partitioning a port has the same effect as automatic
partitioning, except that you must also manually re-enable it. You can
choose to manually partition a port even if there is nothing wrong
with it, for example to prevent a certain device from accessing the
network or to reduce network traffic.
No incoming packet transmission can occur on a manually partitioned
port. Ports can be partitioned and re-enabled using an SNMP-based
network management system, or using the console menu interface.
♦ Master (manageable models only)
The Master indicator lights to indicate that the master hub is serving as an
active master.
♦ Console (manageable models only)
The master hub's Console or Out-Of-Band indicator will light to indicate
whether the hub's RS-232 console port is being used for the console
interface or for out-of-band network management using the SLIP
protocol. The mode of the console port may be set using the console
interface or using an SNMP-based network management system.
♦ FCS/Align (manageable models only)
The FCS (Frame Check Sequence)/Align indicator lights amber to
indicate that data packets have been corrupted during transmission. An
FCS error occurs when a data packet fails an internal consistency check.
An alignment error occurs when the bits in a packet don't add up to a
whole number of bytes.
External Features and Indicators 2-5
10BASE-T Stackable Hubs
♦ Late Col (manageable models only)
The Late Col indicator lights when a collision is detected that happened
after the 512th bit of a frame. Late collisions may be caused by overly
long delays in the Ethernet network, either due to cable that is too long or
a repeater (hub) count that is too high.
♦ Runt (manageable models only)
The Runt indicator lights when the hub receives a packet that is too short.
Ethernet packets must be at least 64 bytes long. Runts are often a normal
side effect of collisions.
♦ Other (manageable models only)
The indicator lights amber when other types of Ethernet errors occur.
♦ Utilization %
The utilization bar graph displays the percentage utilization of Ethernet
bandwidth, comparing the amount of data being transmitted over the
network with the maximum amount possible. All received Ethernet
frames are counted, whether they were valid or not. The hub updates this
display every 0.5 seconds.
♦ HUB ID
The HUB ID display indicates the Unit ID of the hub. In a hub stack,
each hub unit should have a unique ID. The hub is capable of
automatically setting the hub ID, freeing you from having to do so.
Using the console interface, you can turn on Group ID flashing, which
will make the hub ID indicator flash off and on. This may be useful for
identifying a specific hub or a hub stack within a large bank of hubs.
♦ Segmented
The Segmented indicator lights when the entire hub has been manually
segmented off from the rest of the network. Normally the hubs are
2-6 External Features and Indicators
10BASE-T Stackable Hubs
connected together into a single Ethernet “collision domain” through the
daisy chain connectors on the back. Segmenting a hub places it in its
own collision domain, while allowing it to be managed with the rest of
the stack.
External Features and Indicators 2-7
10BASE-T Stackable Hubs
♦ Daisy-chain in/out
The down arrow indicates that another hub in the stack is connected to
the daisy-chain in port of the hub, and the up arrow indicates that another
hub is connected to the daisy-chain out port.
♦ Col Ratio (manageable models only)
The Col Ratio bar graph displays the collision rate on the Ethernet
network, in units of tens of collisions per second. Collisions occur
whenever two or more devices on the network attempt to transmit at the
same time; whenever that happens, all of the devices involved back off
and retransmit after a small delay. An excessive number of collisions can
drastically reduce the bandwidth of the network, and may indicate that the
network is overloaded or that there is some sort of hardware or wiring
problem.
The Col Ratio is only displayed on the manageable hub models; on all
models, however, the Col indicator will blink when a collision occurs.
2-8 External Features and Indicators
10BASE-T Stackable Hubs
3
3 SETTING UP T H E HUB
This chapter explains how to choose a place for your hub stack and how to
set up your hubs.
Power and Environmental
Requirements
The hubs feature an auto-selecting 100-240 V, 50-60 Hz power supply unit,
which works in most countries around the world. Before connecting the
supplied power cord to the hub, check to see that the power cord does not
exceed the maximum length allowed in the country of operation. (The power
cord normally included with the device is 1.83m (6ft.) long.) Also, make sure
it is terminated with the proper connector for use with you r particu lar voltage
and current requirements. The cord voltage and current ratings should
conform to the standards of the country where you are using the hub.
When using a 230V power source within the U.S., use a UL-listed power
cord with the following characteristics:
♦ 18 AWG
♦ Type SVT or SJT three-conductor cord
♦ Maximum 15 feet in length
Setting Up the Hub 3-1
10BASE-T Stackable Hubs
♦ Tandem blade
♦ Grounding type attachment plug rated at 15 A, 250V
When using a 230V power source outside of the U.S., use a cord with the
following characteristics:
♦ 18 AWG
♦ Grounding attachment plug rated at 15A, 250V
♦ The cord should have the appropriate safety approvals for the country
where the equipment will be installed. It should be marked “HAR.”
Be sure the operating environment for the hub is within the following ranges:
♦ Temperature: 32o to 122oF (0o to 50oC)
♦ Humidity: 5% to 95% (non-condensing)
Power Connection
To connect power, take the following steps.
1. Plug the female IEC connector of the power cable into the power
connector on the back of the hub.
2. Insert the three-pronged plug on the power module cable into a non-
switched, grounded power outlet on a wall, a power strip, or a
grounded extension cord.
3. When you plug in the power cable, verify that the hub performs the
self test to confirm the hub is operating correctly. To power off the
hub, disconnect the male connector from the outlet. Do not disconnect
the female connector from the hub to power off the hub.
3-2 Setting Up the Hub
10BASE-T Stackable Hubs
Free-standing Installation
If you are installing the hub as a free-standing unit, apply the four selfadhesive rubber feet to the bottom of the hub chassis. Make sure the bottom
surface of the chassis is clean and dry. Stand the chassis up-on-end and
attach one rubber foot about 1 inch from each corner.
Rack-Mounting
The hubs can be used standalone on a tabletop or shelf, or mounted in a rack.
When mounting the hub stack in a rack, confirm that the rack is an EIA
standard 19-inch rack. For rack mounting convenience, a pair of mounting
brackets is included in the package. Attach the mounting brackets with the
enclosed machine screws, and then mount the hub in the rack using screws
included with the rack.
Figure 3 -1 Rack-Mounting
Setting Up the Hub 3-3
10BASE-T Stackable Hubs
Installing the Transceiver Tray
At the rear of the hub, there is an AUI connector designed for connecting the
hub to various types of Ethernet media such as thick Ethernet coaxial cable
(10BASE5), thin Ethernet coax (10BASE2), or fiber optic cabling (10BASEFL). The AUI connector is recessed, allowing most types of transceivers
(otherwise known as Media Access Units or MAUs) to be installed partially
recessed within the rear panel of the hub. To make inserting and removing
the transceiver easier, a transceiver tray has been included with the hub.
To install a transceiver using the tray, first place the transceiver in the tray,
with the slotted stubs o n the transceiver's male AUI connecto r fitting into the
slots on the front of the tray. Open the door covering the AUI port and slide
the tray and transceiver into the slot until the connection is secure.
Most transceivers should fit within the slot. To accommodate larger
transceivers, insert a standard AUI cable using the tray. In this case, the cable
serves as a short extension to allow the transceiver to be used external to the
hub enclosure.
Figure 3 -2 Installing the Transceiver Tray
3-4 Setting Up the Hub
10BASE-T Stackable Hubs
Replacing the Power Supply
The hub comes with a removable power supply for easy replacement. In the
unlikely event that the power supply fails or is damaged, follow the steps
below to replace the power supply.
1. Disconnect the power cord from the AC outlet.
2. Disconnect the power cord from its connector on the rear of the hub.
3. Using a Phillips screwdriver, remove the screws securing the power
supply to release the unit.
4. Remove the power supply by sliding it out the rear of the chassis. Do
not plug in the power supply when it is outside the chassis! Doing
so could cause personal injury or damage to the power supply.
5. Slide the replacement power supply into the chassis, engaging the
connector carefully.
6. Attach the power cord to the connector of the power supply and
connect the other end of the power cord to the AC supply source.
Figure 3 -3 Replacing the Power Supply
Setting Up the Hub 3-5
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