Accton Technology Fast EtherHub-12s Specifications

Quick Start Guide
Smart Ethernet Hub with 16 RJ-45 Ports and 2 AUI/BNC Ports
This 10 Mbps Ethernet hub includes 16 RJ-45 ports on the front panel, and 2 AUI/BNC ports on
the rear panel. This hub can be operated in a stand-alone configuration, cascaded to other hubs,
or linked to one or more AUI/BNC backbones. This hub is suitable for desktop or rack-mount
installation, and supports full-range power input. The EtherHub-16 conforms to the IEEE 802.3
standard for local area networks based on CSMA/CD, and provides10BASE-T, 10BASE2 and
10BASE5 repeater functions including:
Signal amplification and retiming
Preamble regeneration and fragment extension
Automatic port partition and reconnection
Hardware Installation
The EtherHub-16 has 16 RJ-45 ports, of which Port 16 can serve as either a standard port or a
daisy-chain port. It also has two AUI/BNC ports. Use twisted-pair cable (100W STP or UTP) to
connect any standard RJ-45 (MDI-X) port to a server/workstation, or to connect the RJ-45 daisychain port (i.e., Port 16MDI ) to another compatible hub or switch. You can also attach up to two
Ethernet LAN backbones by connecting thin coaxial cable to a BNC port or connecting thick
coaxial cable to an AUI port.
Making RJ-45 Connections
1. Prepare straight-through twisted-pair cable (100W) with RJ-45 plugs at both ends. The
length of each cable should not exceed 100 meters (328 feet).
Do 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.
EtherHub-16 Quick Start Guide
2. If you are making a connection to an end-node device (e.g., a PC or server), be sure that it has
a properly installed 10BASE-T network interface card. Attach one end of a straight-through
twisted-pair cable to an standard port (Port 1 ~ 16MDI-X ) on the hub and the other end to the
RJ-45 port of the device’s network interface card. 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 16 workstations.
3. Port 16MDI can be connected to a networking device such as a another compatible hub or a
switch. Run straight-through cable from Port 16MDI on this hub to a standard ( MDI-X) port
on the other device. (When attaching the hub to a bridge or router, verify the port type
implemented on these devices before connecting any cabling.)
Note: If necessary, you may also cascade from the MDI port on another device to the MDI-X on
this hub. Limit the number of hubs cascaded together is four, and be sure you do not create
any loops in your network connections.
Connecting to an Ethernet Backbone
Thin Ethernet - Plug the BNC T-type connector into a BNC port on the hub, and use this port to
connect the hub to a 10BASE2 thin Ethernet trunk. If the unit is at the terminal end of a trunk
segment, then connect a 50-ohm (Ω) terminator to the open end of the “T” connector. If the BNC
port has no connection, plug in the T-type connector and lock both ends with a 50 Ω terminator.
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 an AUI port of the hub
and the transceiver. Note that the maximum length of an AUI drop cable is 50 meters (164 feet).
Fiber Optic - If you plan to use an AUI port for connecting fiber optic cable, attach a fiber optic
transceiver (MAU) to an AUI port, and then connect the transceiver to the fiber optic backbone.
To specify the port types used on the rear panel, position the switches as indicated below:
Port 2
Port 1
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
note that if your transceiver provides an SQE
F Also
(Signal Quality Error) test, then it must be disabled.
EtherHub-16 Quick Start Guide
Providing Power to the Hub
1. Power on the hub by plugging the power cord into the power socket at the rear of the hub,
and the other end into a power outlet.
2. Check the LED marked Power on the front panel to see if it is on. The unit automatically
selects a setting that matches the connected input voltage. Therefore, no additional adjustments
are necessary when connecting to any input voltage in the range marked on the rear panel.
System Configuration
The EtherHub-16 provides standard RJ-45 ports for attaching end-node devices such as a
workstation or server, a daisy-chain port for cascading to another hub or switch, BNC ports for
attaching a thin Ethernet backbone, and an AUI port for attaching a thick Ethernet backbone or a
fiber optic link (via the appropriate transceiver). The following figure illustrates some of the
possible network configurations and cabling restrictions that apply to this hub.
EtherHub-16 Quick Start Guide
Hardware Description
RJ-45 Ports
This hub has 16 RJ-45 ports that can be used to connect end-node devices (e.g., workstations, file
servers, or printers). Be sure you have an Ethernet network interface card installed in the device
to be connected to the hub. Then connect it to any available standard RJ -45 port on the hub (i.e.,
Ports 1~16MDI-X) using straight-through twisted-pair (UTP or STP) cable.
Note: When Port 16MDI-X is used, Port 16MDI cannot be used.
Daisy-Chain Port
A compatible hub or other network interconnection device (e.g., an Ethernet switch) can be
attached to the daisy-chain port (Port 16MDI). Use straight-through twisted-pair (STP or UTP)
cable to connect to a standard MDI-X port on the target device. Up to 4 hubs can be cascaded in
this manner. To connect to another hub, you may also run twisted-pair cabling from an MDI-X
port on this hub to an MDI daisy-chain port on another hub. However, if you must connect to
another hub via standard MDI-X ports at both ends of the cable, use crossover cabling.
Note: When Port 16MDI is used, Port 16MDI-X cannot be used.
BNC Port (10BASE2)
This hub has two built-in BNC transceivers (i.e., BNC1 and BNC2) on the rear panel for
connection using thin coaxial cable. To use either BNC port, set the DIP switches to the correct
positions and described on page 2. A BNC port can be connected to a thin coaxial cable segment
containing up to 30 nodes. The thin coaxial cable that links the BNC ports may be extended up
to 185 meters and have computers or other Ethernet devices attached to it. When connecting two
hubs via BNC ports, there should be at least 0.5 meters (1.64 feet) of coaxial cable between the
two BNC ports. If the hub is at the end of an Ethernet cable, plug and lock the 50-ohm ( Ω)
terminators to the T-type connector on the BNC port.
Close off an open end of any T-type connector that is plugged into a BNC port with a 50-Ω
terminator. In particular, when a hub using the BNC port connection is at the end of an
Ethernet segment, close off the open end of the T-type connector with a 50Ω terminator.
Also, if the BNC port is not used, plug a T-type connector into it and close off both ends with
a 50Ω terminator.
EtherHub-16 Quick Start Guide
AUI Port
This hub has two built-in AUI transceivers (i.e., AUI1 and AUI2) on the rear panel for connection
using thick Ethernet cable (10BASE5) or fiber optic Ethernet cable (10BASE-F). To use either
AUI port, set the DIP switches to the correct positions and described on page 2. An AUI port can
be connected to thick Ethernet by running an AUI drop cable from the hub to a 10BASE5
transceiver attached to the trunk line. A thick Ethernet segment can be extended up to 300 meters
(1270 feet) and contain up to 500 nodes. For fiber optic connection, attach a transceiver directly
to the AUI port, and run a point-to-point link up to 2 kilometers (1.24 miles).
Front Panel Indicators
This hub provides LED indicators for monitoring various network conditions. A glance at the
front panel allows you to instantly monitor the status of each station port plus the overall
condition of the hub.
Packets have exceeded the length threshold for Jabber Lockup Protection on the hub.
Power is being supplied to the hub.
Two or more devices are transmitting at the same time. This is normal for an Ethernet
network. However, if there are excessive collisions, the network may be overloaded.
Port is connected to an active node and receiving a valid Link Integrity pulse.
Traffic is being received at this port.
Port is partitioned off due to faulty cable or connectors, or excessive packet collisions.
Link/RX indicator remains unlit.
Workstation’s network adapter, cable or hub port is defective.
The most common cause is a defective network adapter or cable connection. Check
the corresponding cable connections, or the workstation’s network adapter for
possible defects. Verify that the correct cable type (straight or crossover) is being
used. (Note that crossover cable is only required if you cascade hubs via standard
MDI-X ports; i.e., Port 16MDI is not used.) Replace the defective cable or adapter.
Partition indicator lights up.
Hub has partitioned RJ-45 port due to excessive packet collsions.
If port partitioning has occurred, it will be automatically re-enabled when the
problem is corrected or the port receives a valid data packet.
EtherHub-16 Quick Start Guide
Jabber indicator lights up.
Frame received on this port exceeds length threshold for Jabber Lockup Protection.
If jabber lockup has occurred, it will be automatically re-enabled when the problem
is corrected or the port receives a valid data packet. Check for a faulty network
interface card that has started transmitting data but never stops.
Power indicator does not light up after power on.
Defective power supply or attached cable, or a problem at the power source.
Check the power source and attached cable. If the problem cannot be resolved, you
may have to replace your unit’s power supply. Ask for dealer assistance.
Transmission Technique
Access Method
Standard Conformance
Media Supported
Hub-to-Workstation Distance
Power Input
Power Consumption
: Baseband
: Tree, Star, Bus (BNC)
: CSMA/CD, 10 Mbps
: IEEE 802.3 10BASE-T
: Category 3,4,5 twisted-pair cable
: 16 standard MDI-X RJ-45 ports, 1 MDI RJ-45 daisy-chain port,
2 AUI ports, 2 BNC ports
: 100m max.
: 442mm x 141mm x 50mm (17.4" x 5.55" x 1.97")
: 100-240 ( ™10%) VAC
: 1 Amp max.
: 0°C to 80°C (Standard Operating)
: 90% (Noncondensing)
: FCC Class A
EtherHub-16 Quick Start Guide
EMI Warning
FCC Class A Certification
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
1. This device may not cause harmful interference, and
2. This device must accept any interference received,including interference that may cause
undesired operation.
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 computing 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 or shielded twisted-pair (100Ω STP or UTP) for RJ-45 connections.
Warnings 1. Wear an anti-static wrist strap or take other suitable measures to prevent
electrostatic discharge whenever handling this equipment.
2. When connecting this hub to a power outlet, connect the field ground lead on the tripole power plug to a valid earth ground line to prevent electrical hazards.
3. The connectors are not for telephone system use.
Les raccordeurs ne sont pas utilisé pour le système téléphonique!
Note: In order to maintain compliance with the limits of a Class B digital device,
Accton requires that you use a quality interface cable when connecting to this
device. Changes or modifications not expressly approved by Accton could
void the user’s authority to operate this equipment. Suggested cable type is:
Twisted-pair for RJ-45 connections: 10BASE-T
This Ethernet (50 ohm) for BNC connections: 10BASE2
Thick Ethernet (D-type) for AUI connections: 10BASE5 or 10BASE-F
EtherHub-16 Quick Start Guide
You may find the following book prepared by the Federal Communication Commision helpful:
The Interference Handbook
This booklet is available from the U.S. Government Printing Office. Washington, D.C. 20402.
Stock No. 004-000-00345-4.
Safety Compliance
Underwriters Laboratories Compliance Statement
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.
120 Volts
240 Volts (For
North America)
240 Volts (For
Europe only)
Cord Set Specifications
UL Listed/CSA Certified Cord Set
Minimum 18 AWG
Type SVT or SJT three conductor cord
Maximum length of 15 feet
Parallel blade, grounding type attachment plug rated 15A, 125V
UL Listed/CSA Certified Cord Set
Minimum 18 AWG
Type SVT or SJT three conductor cord
Maximum length of 15 feet
Tandem blade, grounding type attachment plug rated 15A, 125V
Cord Set with H05VV-F cord having three conductors with minimum diameter of 0.75 mm2
IEC-320 receptacle
Male plug rated 6A, 250V
The unit automatically 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.
Do not plug a phone jack connector into any of the RJ-45 ports.
This may damage the hub.
Les raccordeurs ne sont pas utilisé pour le système téléphonique!
EtherHub-16 Quick Start Guide
1. Die Steckdose muß sich in der Nähe des Gerätes befinden und leicht zugänglich sein.
2. Zum Reinigen den Stecker aus der Steckdose ziehen. Beim Reinigen keine Flüssigreiniger
oder Sprays verwenden, sondern ein angefeuchtetes Tuch.
3. Das Ethernet hub gerät nicht in Naßräume oder in der Nähe von Wasser benutzen, wie z.B.
Badezimmer, Schwimmbad, Spülbecken usw. . Das Eindringen von Wasser kann zur
Zerstörung des Gerätes führen.
4. Das Ethernet hub gerät nicht auf einer unstabilen Unterlage, wie z.B. Rollwagen, Gestell
usw., aufstellen. Es könnte herunterfallen und Verletzungen oder Beschädigungen von
Mensch und Gerät verursachen.
5. Die Belüftungsöffnungen nicht blockieren oder auf falscher Ober-fläche, wie Bett, Sofa usw.,
stellen. Durch die Blockierung kann es zur Zersörung des Gerätes durch Überhitzung
6. Versuchen Sie niemals dieses Gerät selbst zu warten, da beim Öffnen oder Abnehmen des
Gehäuses die Gefahr eines elektrischen Schlages besteht.
7. Keine Gegenstände auf das Anschlußkabel stellen, damit es nicht durch scharfe Kanten
zerstört werden kann.
8. Keinerlei Gegenstände durch die Öffungen in das Gerät stecken, da es dadurch sonst zu
Kurzschlüssen kommen kann.
9. Bei Störungen des Gerätes den Wartungsdienst verständigen.
10. Bei Reperaturen dürfen nur Orginalersatzteile oder Bauteile mit gleichen Eigenschaften
verwendet werden. Andere Bauteile können Feuer, elektrischen Schlag oder andere Gefahren
11. Nach Beendigung von Wartungsarbeiten oder Reperaturen durch den Kundendienst sollte die
Sicherheitsprüfung durchgeführt werden.
12. Bei längerem Stillstand des Gerätes, ist diese von der Versorgungs- spannung zu trennen.
Dies verhindert eine Beschädigung des Gerätes durch eine Überspannung in der Zuleitung.
13. Der arbeitsplatzbezogene Lärmschutzpegel nach DIN 45 635 ist kleiner 70dB (A).
EtherHub-16 Quick Start Guide
Accton warrants to the original owner that the product delivered in this package will be free from defects in
material and workmanship for the lifetime of the product. 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. Accton recommends that you have the company from whom you purchased this product install it.
Copyright  1996 by Accton Technology Corporation. All rights reserved. Product specification are subject
to change without notice. All trademarks or brand names are properties of their respective companies.
The publisher assumes no responsibility for errors that may appear in this document, nor does it make any
commitment to update information it contains.
All brand and product names mentioned are trademarks or registered trademarks of their respective
For warranty information:
All territories except North and South America:
Accton Technology Corporation, International Headquarters
No. 1, Creation Rd. III, Science-based Industrial Park, Hsinchu 300, Taiwan, R.O.C.
Phone: 886-3-5770-270 Fax: 886-3-5770-267 BBS: 886-3-5770-654
North and South America:
Accton Technology Corporation, USA Headquarters
1962 Zanker Road, San Jose, CA 95112, U.S.A.
Phone: 408-452-8900
Fax: 408-452-8988
BBS: 408-452-8828