Accton Technology EtherHub-24s User manual

EtherHub-24s
Quick Installation Guide
EH2024
E1298-R02
150153-101

Copyright © 1998 by Accton Technology Corporation. All rights reserved.
No part of this document may be copied or reproduced in any form or by any means without the
prior written consent of Accton Technology Corporation.
Accton makes no warranties with respect to this documentation and disclaims any implied warranties
of merchantability, quality, or fitness for any particular purpose. The information in this document
is subject to change without notice. Accton reserves the right to make revisions to this publication
without obligation to notify any person or entity of any such changes.
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No. 1 Creation Road III, P.O. Box 51420
Science-based Industrial Park Irvine, CA 92619-1420
Hsinchu 300, Taiwan, R.O.C. Phone Numbers -
Phone: [phone] Sales: 888-398-2101 or 714-707-4800
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EH2024
E1298-R02
150153-101
EtherHub-24s
Smart Ethernet Hub with
24 10BASE-T (RJ-45) ports,
1 10BASE2 (BNC) port,
and 1 AUI port

Quick Installation GuideEtherHub-24s
1
Contents
Introduction 1
Package Contents 1
Description of Hardware 1
Mounting the Hub 1
Stacking Hubs on a Flat Surface 2
Mounting Hubs in a Rack 2
Connecting the Hub System 2
Making a Connection via an MDI-X Station Port 2
Making a Connection via the MDI Daisy-Chain Port 3
Making a Connection to the BNC Port 3
Making a Connection to the AUI Port 3
Powering on the Hub 3
Verifying Hub Status 4
Applications 4
Product Specifications 4
Base Unit 4
Network Criteria 5
Troubleshooting 5
Diagnosing Hub Indicators 5
Power and Cooling Problems 6
Installation 6
Port and Cable Assignments 6
RJ-45 Port Description 6
EMI Certification 6
FCC Class A (USA) 6
Class A (Canada Department of Communications) 7
Class A (Taiwan Bureau of Commodity Inspection) 7
VCCI Class A Compliance (Japan) 7
CE Mark Declaration of Conformance for EMI and Safety (EEC) 7
Safety Compliance 8
Underwriters Laboratories Inc. (USA) 8
Wichtige Sicherheitshinweise (Germany) 8
Warranty 9
Introduction
The EtherHub-24s includes 24 RJ-45 ports,
1 BNC port for connection to thin Ethernet (10BASE2),
and 1 AUI port for connection to a variety of media types
including 10BASE5 or fiber (using a suitable transceiver).
With these options, you can easily link the hub to a thin or
thick Ethernet backbone, or connect to a remote office. The
hub also has an indicator panel that includes utilization
and link/traffic LEDs, making it easy to monitor the hub.
This guide contains all the information required to install and operate the hub.
Package Contents
The package includes:
·EtherHub-24s (Model No. EH2024)
·Four rubber foot pads ·BNC connector
·Rack mount bracket kit ·Quick Installation Guide
·AC power cord ·Owner registration card
Description of Hardware
This hub consists of 24 RJ-45 10Mbps ports, 1 BNC port, and 1 AUI port. The
following figure shows the front and back panel of the hub:
Mounting the Hub
This hub can be placed directly on your desktop, or mounted in a rack.
Before you start installing the hub, 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 (± 3Hz). The
hub's power supply automatically adjusts to the input voltage level.
·The hub should be located in a cool dry place, with at least 10 cm. (4 in.) of
space at the front and back for ventilation.
·Place the hub out of direct sunlight, and away from heat sources or areas
with a high amount of electromagnetic interference.
·If you intend to mount the hub 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.

Quick Installation GuideEtherHub-24s
2 3
Stacking Hubs on a Flat Surface
This hub can be stacked anywhere
there is a 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 hub.
2. Place the first hub on a firm flat surface where you want to install the stack.
3. Repeat step 1 for each hub before stacking them. The rubber foot pads
cushion the hub against shock/vibrations and provide space between each
hub for ventilation.
Mounting Hubs in a Rack
Please comply with the following
instructions to ensure that your hub
is securely mounted in the rack.
1. Use a standard EIA 19-inch rack.
2. Use the brackets and screws supplied in the rack mounting kit.
3. Use a cross-head screwdriver to attach the brackets to the side of the hub.
4. Position the hub in the rack by lining up the holes in the brackets with the
appropriate holes on the rack, and then use the supplied screws to mount
the hub in the rack.
Connecting the Hub System
This hub has 24 RJ-45 ports, one of which also serves as an (MDI) daisy-
chain port. It also has one BNC port on the rear panel for connection to thin
Ethernet (10BASE2), and one AUI port for connection to thick Ethernet
(10BASE5) or fiber (10BASE-F).
Making a Connection via an MDI-X Station Port
You can connect any RJ-45 (MDI-X) station port on the hub to any device that
uses a standard network interface such as a PC 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 network interface cards for connecting to the hub's
RJ-45 (MDI-X) station ports. You also need to prepare straight-through
shielded or unshielded twisted-pair cables with RJ-45 plugs at both ends.
Use 100WCategory 3, 4 or 5 cable for all RJ-45 connections.
2. Connect one end of the cable to the RJ-45 port of the network interface card,
and the other end to any available (MDI-X) station port on the hub. 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 hub in a stand-alone configuration,
you can network up to 24 end nodes.
IDo not plug a phone jack connector into any RJ-45 port. This may damage the hub.
Instead, use only twisted-pair cables with RJ-45 connectors that conform with FCC
standards.
Notes: 1. Make sure each twisted-pair cable does not exceed 100 meters (328 feet).
2. When using Port 24 as an MDI-X port, set the port selection switch to 24MDI-X.
Making a Connection via the MDI Daisy-Chain Port
1. To make a direct connection to a compatible hub or switch, use the MDI
daisy-chain port (Port 24). When connecting to this port, remember to set
the port selection switch to MDI. You can also connect any RJ-45 (MDI-X)
port on the hub to an MDI daisy-chain port on the other device.
2. Prepare straight-through shielded or unshielded twisted-pair cables with
RJ-45 plugs at both ends. Use 100WCategory 3, 4 or 5 cable for all RJ-45
connections. When inserting an RJ-45 plug, be sure the tab on the plug
clicks into position to ensure that it is properly seated.
Notes: 1. To connect to another hub or switch, you may also attach to (MDI-X) station
ports at both ends if you use crossover cabling (see page 6).
2. When using Port 24 as an MDI port, set the port selection switch to 24MDI.
3. When connecting to another 10Mbps hub, you can cascade up to 4 hubs,
and use up to 100 meters (328 feet) for each inter-hub link.
4. To achieve a larger network diameter, you should use a switch to connect
several hubs (or stacks) together. Because a switch breaks up the path for
connected devices into separate collision domains, it has no restrictions on
cascade length.
Making a Connection to the BNC Port
Plug the BNC T-type connector (provided with the hub) into a BNC port on the
module. When connecting two devices via BNC ports, there should be at
least 0.5 meters (1.64 feet) of coaxial cable between the two BNC ports. A thin
Ethernet coaxial cable segment can be extended up to 185 meters (607 feet)
and can link up to 30 nodes. If the unit is at the terminal end of a segment,
connect a 50Wterminator to the open end of the "T" connector.
Making a Connection to theAUI Port
Thick Ethernet - Attach an AUI to 10BASE5 transceiver to the thick Ethernet trunk,
and then run an AUI drop cable (with 15-pin D-type connectors on both ends)
between the AUI port on the hub and the transceiver. Note that the maximum
length of an AUI drop cable is 50 meters (164 feet). A thick Ethernet segment
can be extended up to 500 meters (1640 feet) and can link up to 100 nodes.
Fiber - Attach a 10BASE-F fiber optic transceiver to the AUI port. Use 50/125µm
or 62.5/125µm multi-mode fiber cabling with SC or ST-type connectors
(depending on the transceiver). Run cabling from the TX/RX ports on this hub
to the RX/TX ports on the other device. When inserting the cable, be sure the
tab on the plug clicks into position to ensure that it is properly seated. Note
that 10Mbps fiber can be extended up to 2 kilometers (1.24 miles).
Powering on the Hub
1. Plug the power cord into the power socket at the rear of the hub, and the
other end into a power outlet.
2. Turn on the power switch on the back of the hub.
3. 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.
Note: The unit supports a "hot remove" feature which permits you to connect/disconnect
RJ-45 or other media cables without powering off the hub and without disrupting
the operation of the devices attached to the hub.

Quick Installation GuideEtherHub-24s
4 5
Verifying Hub Status
Check each connection by comparing the indicators with the following table.
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Applications
Flexible Configuration - This hub is not only designed to provide network
access for 10Mbps connections, but also to provide a wide range of options in
setting up network connections. It can be used as a simple stand-alone hub,
or can be cascaded to any compatible hub or switch. A sample configuration
diagram is shown in the following figure.
Product Specifications
Base Unit
Access Method CSMA/CD, 10 Mbps
Standards Conformance IEEE 802.3 10BASE-T, 10BASE2,AUI
Communication Rate 10 Mbps
Media Supported 10BASE-T - 100W Category 3,4,5 UTP/STP,
10BASE2 - thin Ethernet coaxial cable,
10BASE5 - thick Ethernet coaxial cable1,
10BASE-F - ST-type multimode fiber1
(1: via suitable AUI transceiver)
Number of Ports 24 RJ-45 ports, 1 BNC port, and 1AUI port
Indicator Panel Power, utilization, collisions, partition, link/traffic
Dimensions 440 x 172 x 43 mm (17.32 x 4.58 x 6.77 in)
Weight 4.42 kg (9.74 lb)
Input Power 100~240 VAC, 50/60 Hz (built-in full-range power module)
Power Consumption 15 Watts maximum
Maximum Current 0.11ARMS max. @ 110V, 0.05RMS max. @ 240V
Heat Dissipation 51 BTU/hr
Temperature 0°C to 50°C (32 to 122°F) Standard Operating
Humidity 5% to 95% (Noncondensing)
Certification CE Mark
Emissions FCC Class A, VCCI Class A, CISPR 22 Class A
Immunity IEC 801-2/3/4
Safety UL, CSA, TÜV/GS
NetworkCriteria
Hub-to-Workstation Distance 100 meters maximum using twisted-pair cable
Inter-hub Distance (MDI Port) 100 meters using twisted-pair cable (4 hub cascade)
(100 meters = 328 feet)
Troubleshooting
Diagnosing Hub Indicators
The hub can be easily monitored through panel indicators to assist the
network manager in identifying problems. This section describes common
problems you may encounter and possible solutions.
Symptom: Power indicator does not light up (green) after power on.
Cause: Defective power outlet, power cord, or internal power supply.
Solution: Check the power outlet by plugging in another device that is functioning
properly. Check the power cord with another device. If these measures
fail to resolve the problem, have the unit's power supply replaced by a
qualified Accton distributor.
Symptom: Link indicator does not light up (green) after making a connection.
Cause: Network interface (e.g., a network adapter card on the attached device),
network cable, or hub port is defective.
Solution: Verify that the hub and attached device are powered on. Be sure the cable
is plugged into both the hub and attached device. Check the adapter on the
attached device and cable connections for possible defects. 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.
Replace the defective adapter or cable if necessary. Also verify that you
have not exceeded specified limits for any attached media as summarized in
the following table:
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Quick Installation GuideEtherHub-24s
6 7
Power and Cooling Problems
If the power indicator does not turn on when the power cord is plugged in, you
may have a problem with the power outlet, power cord, or internal power
supply as explained in the previous section. However, if the unit powers off
after running for a while, check for loose power connections, power losses or
surges at the power outlet, and verify that the fan on back of the unit is
unobstructed and running prior to shutdown. If you still cannot isolate the
problem, then the internal power supply may be defective. In this case,
contact your Accton distributor for assistance.
Installation
Verify that all system components have been properly installed. If one or more
components appear to be malfunctioning (e.g., the power cord or network
cabling), test them in an alternate environment where you are sure that all the
other components are functioning properly.
Port and Cable Assignments
RJ-45 Port Description
RJ-45 station ports (MDI-X) can be attached to any devices which use a
standard network interface (e.g., a workstation, server, bridge or router).
Similar networking devices (e.g., another hub or switch) can be cascaded by
connecting any of the RJ-45 station ports on the hub to a daisy-chain port
(MDI) on the other device. Use 100WCategory 3, 4 or 5 twisted-pair cable:
unshielded or shielded (UTP/STP) cable for all RJ-45 connections on the front
panel, and shielded (STP) cable for the stack ports on the rear panel. Also be
sure that the length of any twisted-pair connection does not exceed 100
meters (328 feet).
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EMI Certification
FCC Class A (USA)
Warning: This equipment generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instruction manual, may cause
interference to radio communications. It has been tested and found to comply with the
limits for a Class A digital device pursuant to Subpart B of Part 15 of FCC Rules, which
are designed to provide reasonable protection against such interference when
operated in a commercial environment. Operation of this equipment in a residential area
is likely to cause interference, in which case the user, at his own expense, will be
required to take whatever measures are required to correct the interference.
You may use unshielded twisted-pair (UTP) for RJ-45 connections - Cat. 3 or greater.
Class A (Canada Department of Communications)
This digital apparatus does not exceed the Class A limits for radio noise emissions from
digital apparatus as set out in the interference-causing equipment standard entitled
"Digital Apparatus", ICES-003 of the Department of Communications.
Cet appareil numérique respecte les limites de bruits radioélectriques applicables aux
appareils numériques de Classe A prescrites dans la norme sur le matériel brouilleur:
"Appareils Numérques", NMB-003 édictée par le ministère des Communications.
Class A(Taiwan Bureau of Commodity Inspection)
VCCI Class A Compliance (Japan)
CE Mark Declaration of Conformance for EMI and Safety (EEC)
This is to certify that this product complies with ISO/IEC Guide 22 and EN45014.
It conforms to the following specifications:
EMC: EN55022(1988)/CISPR-22(1985) class A
EN60555-2(1995) class A
EN60555-3
IEC1000-4-2(1995) 4kV CD, 8kV AD
IEC1000-4-3(1995) 3V/m
IEC1000-4-4(1995) 1kV - (power line), 0.5kV - (signal line)
This product complies with the requirements of the Low Voltage Directive 73/23/EEC
and the EMC Directive 89/336/EEC.
Warning! Do not plug a phone jack connector in the RJ-45 port. This may damage this
device. Les raccordeurs ne sont pas utilisé pour le système téléphonique!

Quick Installation GuideEtherHub-24s
8 9
Safety Compliance
Underwriters Laboratories Inc. (USA)
Important! Before making connections, make sure you have the correct Cord Set.
Check it (read the label on the cable) against the following specification list.
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Wichtige Sicherheitshinweise (Germany)
1. Bitte lesen Sie diese Hinweise sorgfältig durch.
2. Heben Sie diese Anleitung für den späteren Gebrauch auf.
3. Vor jedem Reinigen ist das Gerät vom Stromnetz zu trennen. Verwenden Sie keine
Flüssigoder Aerosolreiniger. Am besten eignet sich ein angefeuchtetes Tuch zur Reinigung.
4. Die Netzanschlu ßsteckdose soll nahe dem Gerät angebracht und leicht zugänglich sein.
5. Das Gerät ist vor Feuchtigkeit zu schützen.
6. Bei der Aufstellung des Gerätes ist auf sicheren Stand zu achten. Ein Kippen oder Fallen
könnte Beschädigungen hervorrufen.
7. Die Belüftungsöffnungen dienen der Luftzirkulation, die das Gerät vor Überhitzung schützt.
Sorgen Sie dafür, daß diese Öffnungen nicht abgedeckt werden.
8. Beachten Sie beim Anschluß an das Stromnetz die Anschlußwerte.
9. Verlegen Sie die Netzanschlußleitung so, daß niemand darüber fallen kann. Es sollte auch
nichts auf der Leitung abgestellt werden.
10. Alle Hinweise und Warnungen, die sich am Gerät befinden, sind zu beachten.
11. Wird das Gerät über einen längeren Zeitraum nicht benutzt, sollten Sie es vom Stromnetz
trennen. Somit wird im Falle einer Überspannung eine Beschädigung vermieden.
12. Durch die Lüftungsöffnungen dürfen niemals Gegenstände oder Flüssigkeiten in das Gerät
gelangen. Dies könnte einen Brand bzw. elektrischen Schlag auslösen.
13. Öffnen sie niemals das Gerät. Das Gerät darf aus Gründen der elektrischen Sicherheit nur
von authorisiertem Servicepersonal geöffnet werden.
14. Wenn folgende Situationen auftreten ist das Gerät vom Stromnetz zu trennen und von einer
qualifizierten Servicestelle zu überprüfen:
a. Netzkabel oder Netzstecker sind beschädigt.
b. Flüssigkeit ist in das Gerät eingedrungen.
c. Das Gerät war Feuchtigkeit ausgesetzt.
d. Wenn das Gerät nicht der Bedienungsanleitung entsprechend funktioniert oder
Sie mit Hilfe dieser Anleitung keine Verbesserung erzielen.
e. Das Gerät ist gefallen und/oder das Gehäuse ist beschädigt.
f. Wenn das Gerät deutliche Anzeichen eines Defektes aufweist.
15. Zum Netzanschluß dieses Gerätes ist eine geprüfte Leitung zu verwenden. Für einen
Nennstrom bis 6A und einem Gerätegewicht größer 3kg ist eine Leitung nicht leichter als
H05VV-F, 3G, 0.75mm2 einzusetzen.
Der arbeitsplatzbezogene Schalldruckpegel nach DIN 45 635 Teil 1000 beträgt 70dB(A)
oder weniger.
Warranty
Accton warrants to the original owner that the product delivered in this
package will be free from defects in material and workmanship for three
years. For the warranty to apply, you must register your purchase by returning
the registration card indicating the date of purchase and including proof of
purchase. There will be a minimal charge to replace consumable
components, such as fuses, power transformers, and mechanical cooling
devices. The warranty does not cover the product if it is damaged in the
process of being installed.
THEABOVE WARRANTY IS IN LIEU OFANY OTHER WARRANTY, WHETHER EXPRESS,
IMPLIED OR STATUTORY, INCLUDING BUT NOT LIMITEDTOANY WARRANTY OF
MERCHANTABILITY, FITNESS FORA PARTICULAR PURPOSE, ORANYWARRANTY
ARISING OUT OFANY PROPOSAL, SPECIFICATION OR SAMPLE. ACCTON SHALL NOTBE
LIABLE FOR INCIDENTALOR CONSEQUENTIAL DAMAGES. ACCTON NEITHERASSUMES
NORAUTHORIZESANY PERSON TOASSUME FOR ITANYOTHER LIABILITY.