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Congratulations on your purchase of the NETGEAR™ Model EN104, Model
EN108, or Model EN116 Ethernet hub. The hubs deliver standards-based, plugand-play networking solutions for small businesses, home offices, and lowdensity workgroups of larger companies.
In this installation guide, all three hubs are referred to collectively as the Model
EN104/EN108/EN116 hub. Each hub is listed individually when information is
provided that refers to a specific model.
Features
The Model EN104/EN108/EN116 hub has the following features:
• Four (on the Model EN104 hub), eight (on the Model EN108 hub), and
sixteen (on the
provide 10 megabit per second (Mbps) networking using simple unshielded
twisted pair (UTP) wiring
• Built-in LED indicators for at-a-glance status checks by vista networks
ports
• AUI (not on the Model EN104 hub) or coaxial BNC backbone support for
connecting to an existing Ethernet segment or external transceiver, or for
network expansion by connecting multiple hubs together using twisted pair
or coaxial cabling
Model EN116 hub)
vista 10BASE-T network ports (RJ-45) that
• Uplink port for connecting to other hubs using simple straight-through
cables
• Clear front-panel light-emitting diode (LED) indicators to monitor overall
hub status
• Plug-and-play installation with no software to configure
• Complete hub functions including packet retiming, collision detection,
preamble regeneration, and fragment extension
• Automatic partitioning and reconnection of a port that has excessive
collisions or is jabbering
• Automatic polarity detection for recognizing and correcting incorrect
polarity on the receive pair
• Compact design, enabling easy tabletop or rack-mounting installation
• External power adapter
• Limited lifetime warranty on the unit and three-year warranty on the power
supply
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Package Contents
Model EN104 hub
Pwr
Col
Pwr
Col
1234 5678
Mounting kit
Installation guide,
Warranty & Owner
Registration Card,
Support Information
Card
10 BASE-T HUB
EN104
LINK Rx
10 BASE-T HUB
EN116
or
or
Model EN116 hub
1234 5678
Model EN108 hub
10 BASE-T HUB
EN108
Pwr
Col
1234 5678
LINK Rx
LINK Rx
Power
adapter
8731FA
Verify that your package contains the following:
• Model EN104 hub, Model EN108 hub, or Model EN116 hub
• Mounting kit (for wall installation)
• BNC T-connector and BNC 50
terminator (only if you have purchased the
Ω
Model EN108 hub or the Model EN116 hub)
• This installation guide
• Warranty & Owner Registration Card
• Support Information Card
• Power adapter
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Product Illustration
Front Panel of the Model EN104 hub
10BASE-T ports
10 BASE-T HUB
EN104
Pwr (Power)
Col (Collision)
Pwr
Col
LINK Rx
Normal/Uplink
push button
Front Panel of the Model EN108 hub
10 BASE-T HUB
Pwr
Col
EN108
1234 5678
LINK Rx
Front Panel of the Model EN116 hub
10 BASE-T HUB
Pwr
Col
EN116
1234 5678
1234 5678
LINK Rx
8732FA
Vista 10BASE-T Network Ports with Built-in LEDs
The front panel of the Model EN104 hub has four RJ-45 10BASE-T ports, the
Model EN108 hub has eight RJ-45 10BASE-T ports, and the Model EN116 hub
has sixteen RJ-45 10BASE-T ports. Two LEDs—the Link LED and the Rx
LED—are built into each 10BASE-T port.
Link
LEDRxLED
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Model EN104/EN108/EN116 Ethernet Hub Installation Guide
LEDs
The table below describes the activity of the LEDs.
Label
Pwr (Power) Green On Power is supplied to the hub.
Col (Collision) Amber Blinking Data collision is occurring on the
Link
(located on the top left
corner of each vista
10BASE-T port)
Rx
(located on the top right
corner of each vista
10BASE-T port)
Active
(for BNC)
Rx
(for BNC)
Active
(for AUI)
Rx
(for AUI)
Color Activity Description
network. Note that occasional
collisions are normal.
Green On The link between this port and the
connected device is good.
Green Blinking There is incoming data on the port.
Green On The link between the BNC port and the
connected device is good.
Green Blinking There is incoming data on the BNC
port.
Green On The link between the AUI port and the
connected device is good.
Green Blinking There is incoming data on the AUI port.
Normal/Uplink Push Button
The Normal/Uplink push button allows you to select Normal (MDI-X) wiring
for direct PC connection. The push button also allows you to select Uplink
(MDI) wiring for connection to a hub or a switch through port 4 on the
EN104 hub, port 8 on the
Model EN108 hub, or port 16 on the Model EN116 hub.
Model
This uplink configuration eliminates the need to use a crossover cable. The other
10BASE-T ports are permanently configured for normal wiring for connection
to a PC.
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Rear Panel
The rear panel of the hub has a BNC port that you can use to connect to a
backbone network or other PCs using thin coaxial cable.
The rear panel of the Model EN108 hub and the Model EN116 hub also has an
AUI port in addition to the BNC port. You can use the AUI port with the
appropriate transceiver to connect the hub to a backbone network using thin
coaxial cable, thick coaxial cable, fiber optic cable, or 10BASE-T wiring.
The rear panel also includes a DC power receptacle.
BNC port LEDs
BNC port
12Vdc 1.2A
Active
BNC
Rx
— +
Rear Panel of the Model EN104 hub
AUI port LEDs
BNC
Rx
Power receptacle
12Vdc 1.2A
— +
AUI port
AUI
Active
Rx
Active
Rear Panel of the Model EN108 hub
AUI
Active
Rx
Active
Rx
Rear Panel of the Model EN116 hub
12Vdc 1.2A
BNC
— +
8738FA
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Installation Procedures
Prepare the Site
Before you begin installing your hub, prepare the installation site. Make sure
your operating environment meets the operating environment requirements of
the equipment.
Characteristic
Temperature
Operating humidity Maximum relative humidity of 90%, noncondensing.
Ventilation Minimum 2 inches (5.08 cm) on all sides for cooling.
Operating conditions At least 6 feet (1.83 m) to nearest source of electromagnetic
Service access Minimum 12 inches (19.68 cm) front and back for service
Power Adequate power source within 6 feet (1.83 m).
Wiring hardware Wiring hardware, such as punchdown blocks or patch panels,
Requirement
Ambient temperature between 0 ° and 40 ° C (32 ° and 104 ° F).
No nearby heat sources such as direct sunlight, warm air
exhausts, or heaters.
Adequate airflow in room or wiring closet.
noise (such as photocopy machine or arc welder).
access and maintenance. Front and back clearance for cables
and wiring hardware such as punchdown blocks.
should be complete before installing the hub.
Install the Hub
To install your hub on a flat surface, you do not need any special tools. Be sure the hub is
positioned with at least 2 inches of space on all sides for ventilation.
To install the hub on a wall, measure the distance between the mounting holes on the back of the
hub and mark the wall to match the location of the mounting holes on the hub. At the marked
location, screw into the wall the two screws that you received with the mounting kit included in
your package contents. B
connected, is close to an electrical outlet, and provides at least 2 inches of space
all around the hub for ventilation.
e sure to choose a location that is near the devices to be
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Connect a PC to the Hub
You can connect PCs, Apple Macintosh computers, UNIX workstations, or any
device equipped with a 10BASE-T Ethernet interface to the RJ-45 ports on your
hub by using twisted pair Ethernet cables.
To connect any of the RJ-45 ports on your hub to a PC, use a regular straightthrough UTP cable. If you are connecting using port 4 on the Model EN104 hub,
port 8 on the Model EN108 hub, or port 16 on the Model EN116 hub, set the
Normal/Uplink push button to Normal.
(The Model EN108 hub is
shown in the illustration.)
P
w
r
C
o
l
1
2
3
4
5
N
o
r
m
6
a
l
/
U
p
l
i
n
k
7
8
8734FA
Note:
Ethernet specifications limit the cable length between your PC
or server and the hub to 328 feet (100 meters) in length.
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Connect the Hub to a Network
Cascading refers to connecting hubs together to increase the number of ports or
the number of users supported on the network. The 10BASE-T ports can be used
to cascade hubs together.
The twisted pair cable extended from a 10BASE-T port (or UTP port) is called a
twisted pair segment and can be up to 100 meters (m) in length. The 10BASE-T
ports, with the exception of port 4 on the Model EN104 hub, port 8 on the
Model EN108 hub, or port 16 on the Model EN116 hub, are MDI-X (or Normal)
ports. Use the following table as a guide for selecting the appropriate network
cable.
Connecting Port
on the Hub
Model EN104 hub:
Ports 1–3 PC, server, or router Straight-through cable
Ports 1–3 Hub or switch Crossover cable
Model EN108 hub:
Ports 1–7 PC, server, or router Straight-through cable
Ports 1–7 Hub or switch Crossover cable
Model EN116 hub:
Ports 1–15 PC, server, or router Straight-through cable
Ports 1–15 Hub or switch Crossover cable
Connecting Device Cable Used
Set the Normal/Uplink Push Button
If you are connecting to port 4 on the Model EN104 hub, port 8 on
the Model EN108 hub, or port 16 on the Model EN116 hub, use the following
table. Determine the type of cable to use and how to set
the Normal/Uplink push button.
Connecting Port
Port 4, port 8, or port 16 set to
Normal
Port 4, port 8, or port 16 set to
Uplink
Connecting Device Cable Used
PC, server, or router Straight-through cable
Hub or switch Straight-through cable
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Cascade the Hub
The following illustration shows cascading hubs together in a hierarchical star
through the 10BASE-T ports and indicates the setting of the Normal/Uplink
push button on each hub.
Hub 1
10 BASE-T HUB
EN116
Pwr
Col
1234 5678
1234 5678
LINK Rx
Normal
Hub 2
TP
10 BASE-T HUB
EN108
Pwr
Col
1234 5678
Uplink
TP
10 BASE-T HUB
EN108
Pwr
Col
1234 5678
Hub 3
Uplink
Hub 4 Hub 5
UplinkUplink
AB
Note:
Ethernet specifications limit the number of hubs with twisted
8735FA
pair links in any communication path to five, as shown in the e xample.
When PC “A” communicates with PC “B,” the communication path
goes from hub 4 to hub 2, to hub 1, to hub 3, and then to hub 5.
The following illustration shows cascading hubs together daisy-chain style and
indicates the setting of the Normal/Uplink push button on each hub.
Model EN104 hub
10 BASE-T HUB
EN104
LINK Rx
Pwr
Col
Normal
Pwr
Col
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Model EN108 hub
10 BASE-T HUB
Pwr
EN108
Col
1234 56 78
Model EN116 hub
10 BASE-T HUB
EN116
1234 56 78
LINK Rx
Uplink
LINK Rx
1234 56 78
Uplink
8733FA
Connect to a Network Using the BNC Port
The BNC port on the rear panel of the hub is used for connecting to a thin
coaxial segment. You can connect other Model EN104/EN108/EN116 hubs,
servers, workstations, or other devices to the BNC port. A BNC-T connector is
inserted in the port, and the 50
end device. By using the BNC port for cascading, you treat each connected hub
as just another node on the coaxial segment.
The separation marks in the coaxial cable between the hubs in this illustration
represent the incorporation of other devices and show that interconnection is not
limited to hubs.
Ω
terminator terminates the connection at each
BNC T- connector
BNC 50 terminator
BNC 50 terminator
Note:
Ethernet specifications limit a BNC segment to 30 BNC
Model EN104 hub
Model EN108 hub
Model EN116 hub
8736FA
connections, specify a minimum of 1.64 feet (0.5 m) between any two
stations, and limit segments to 607 feet (185 m) in length.
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Connect to a Network Using the AUI Port
The AUI port on the rear panel (found only on the Model EN108 hub and the
Model EN116 hub) is normally used for connecting a thick coaxial segment.
With the right type of transceiver, you can use the AUI port to connect to most
types of network media, including 10BASE-T twisted pair cable or thin coaxial,
thick coaxial, and 10BASE-FL fiber optic cables.
Note:
All transceivers connected to the AUI port must have the signal
quality error (SQE) test function disabled. Refer to your transceiver
documentation for information about disabling the SQE test function.
Cable terminator device
AUI cable
Thick
coaxial
cable
10BASE-5
transceiver
Model EN108 hub and Model EN116 hubs
Note:
Ethernet specifications limit thick coaxial segments to 100
8737FA
stations and 1,640 feet (500 m) in length, and they specify that the
AUI cable between the hub and the transceiver is limited to 164 feet
(50 m).
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Verify Installation
T o complete the installation, connect the po wer cord first to the power receptacle
on the hub rear panel and then to the power outlet on the wall. When power has
been applied to the hub:
• The green Pwr (Power) LED on the front panel is on.
• The green Link LED on each connected port is on.
• The green Active LED on each connected AUI port is on.
• The green Active LED on each connected BNC port is on.
If encounter any problems, refer to “Troubleshooting” on page 4.
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Troubleshooting
Symptom
Amber Col LED
blinks.
Amber Col LED
blinks
excessively.
Green Link LED
is off when a
cable is attached.
Green Link LED
is not blinking
when there is
data
transmission.
Green Active
LED on the BNC
port is not on
when the port is
connected.
Green Rx LED
on the BNC port
is not blinking
when there is
data
transmission.
Green Active
LED on the AUI
port is not on
when the port is
connected.
Green Rx LED
on the AUI port is
not blinking when
there is data
transmission.
Cause Solution
There is data
collision on the
network.
There is data
collision on
the network
because the
network is
extremely busy
or defective
devices are
connected on the
network that
cannot detect
network traffic or
collision.
Wrong or
miswired cables
are used.
The port is not
detecting a
successful link.
The port is not
detecting data
transmission.
The port is not
detecting a
successful link.
The port is not
detecting data
transmission.
The port is not
detecting a
successful link.
The port is not
detecting data
transmission.
Data collision is normal on Ethernet networks. No
action is required.
Make sure connected devices are operating in
half-duplex mode. The hub is not compatible with
devices that operate in full-duplex mode.
If you suspect that there might be a defective
device on the network, disconnect devices one at
a time to isolate the defective unit on the network.
If the network is extremely busy, you may have to
segment the network with an Ethernet switch such
as a NETGEAR Ethernet switch or to upgrade
your network to Fast Ethernet operation.
Make sure the correct UTP cables are used. See
the table in the installation section of this guide for
cable use and Normal/Uplink push button
information. Note that home telephone cab les can
cause a collision condition and cannot be used in
place of UTP cables.
Check for a bad cable, cable pairs that are not
correctly wired, or loose connectors. Make sure
that there is power to both the hub and the
Ethernet transceiver on the connected device.
Check for a bad cable, cable pairs that are not
correctly wired, or loose connectors. Make sure
that there is power to both the hub and the
Ethernet transceiver on the connected device.
Make sure that each segment is terminated with a
BNC 50 terminator at both ends. Check for a bad
cable.
Check for a bad cable or loose connectors. Make
sure that there is power to both the hub and the
connected device.
Make sure that the AUI transceiver is functioning
properly, the coaxial segment is terminated
correctly, the segment is not disconnected along
the cable length, and the signal quality error
(SQE) test on the transceiver is disabled. Refer to
your transceiver documentation f or instructions on
setting the SQE.
Check for a bad cable or loose connectors. Make
sure that there is power to both the hub and the
connected device.
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Network Interface Cards
Make sure the network interface cards installed in the workstations are in
working condition and the software drivers have been installed.
Hub Integrity
If required, verify the integrity of the hub by resetting it. Turn power to the hub
off and then back on. If the problem continues and you have completed all the
preceding diagnoses, contact NETGEAR Customer Support. For the phone
number of the representative in your area, refer to the Support Information Card.
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Technical Specifications
General Specifications
Network Protocol and Standards Compatibility
IEEE 802.3i, 10BASE-T, 10BASE-2, 10BASE-5 Ethernet
Data Rate
Interface
Max. Power Consumption
Model EN104 hub 11.0 W
Model EN108 hub 16.5 W
Model EN116 hub 20.5 W
DC Output Voltage (Power Adapter):
Model EN104 hub 7.5 V DC@ 1A max.
Model EN108 hub 12 V DC @ 1.2A max.
Model EN116 hub 12 V DC @ 1.2A max.,
Physical Specifications
Dimensions:
Model EN104 hub 3.7 by 4.0 by 1.1 in.
Model EN108 hub 6.2 by 4.0 by 1.1 in.
Model EN116 hub 11.3 by 4.0 by 1.1 in.
Weight:
Model EN104 hub 0.74 lb (0.34 kg)
Model EN108 hub 1.17 lb (0.53 kg)
Model EN116 hub 1.97 lb (0.89 kg)
Environmental Specifications
Operating temperature: 0 ° to 40 ° C (32 ° to 104 ° F)
Operating humidity: 90% maximum relative humidity,
Electromagnetic Complience
CE mark, commercial
FCC Part 15 Class A
EN 55 022 (CISPR 22), Class A
VCCI Class A
C-Tick
Safety Agency Approvals for Power Adapter
CE mark, commercial
UL listed (UL 1950)
CUL
TUV licensed (EN 60 950)
T-Mark
10 Mbps, Manchester encoded
10BASE-T ports (RJ-45), BNC port,
AUI port (Model EN108 hub and Model
EN116 hub only)
94 by 101 by 28 mm
158 by 101 by 28 mm
286 by 101 by 28 mm
noncondensing
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Replacement Power Adapter
If, for any reason, the power adapter for any of the hubs fails, contact
NETGEAR immediately to order a replacement adapter. Use the following table
when ordering a specific power adapter.
Order code
PWR-024-001 Power adapter (7.5 V DC, 1 A), North America
PWR-024-002 Power adapter (7.5 V DC, 1 A), Europe
PWR-024-003 Power adapter (7.5 V DC, 1 A), United Kingdom
PWR-024-004 Power adapter (7.5 V DC, 1 A), Australia
PWR-024-005 Power adapter (7.5 V DC, 1 A), Japan
Order code
PWR-002-004 Power adapter (12 V DC, 1.2 A), North America
PWR-002-005 Power adapter (12 V DC, 1.2 A), Japan
PWR-002-006 Power adapter (12 V DC, 1.2 A), Europe
PWR-002-008 Power adapter (12 V DC, 1.2 A), United Kingdom
PWR-002-010 Power adapter (12 V DC, 1.2 A), Australia
EN104
EN108, EN116
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
© 2000 by NETGEAR, Inc. All rights reserved.
Trademarks
NETGEAR™ is a trademark of NETGEAR, Inc. Windows® is a registered trademark of Microsoft
Corporation. Other brand and product names are trademarks or registered trademarks of their respective
holders. Information is subject to change without notice.
Statement of Conditions
In the interest of improving internal design, operational function, and/or reliability, NETGEAR reserves the
right to make changes to the products described in this document without notice.
NETGEAR does not assume any liability that may occur due to the use or application of the product(s) or
circuit layout(s) described herein.
Certificate of the Manufacturer/Importer
It is hereby certified that the NETGEAR Model EN104 hub, Model EN108 hub, and Model EN116 hub have
been suppressed in accordance with the conditions set out in the BMPT-AmtsblVfg 243/1991 and Vfg 46/
1992. The operation of some equipment (for example, test transmitters) in accordance with the regulations
may, however, be subject to certain restrictions. Please refer to the notes in the operating instructions.
Federal Office for Telecommunications Approvals has been notified of the placing of this equipment on the
market and has been granted the right to test the series for compliance with the regulations.
Voluntary Control Council for Interference (VCCI) Statement
This equipment is in the first category (information equipment to be used in commercial and/or industrial
areas) and conforms to the standards set by the Voluntary Control Council for Interference by Data Processing
Equipment and Electronic Office Machines that are aimed at preventing radio interference in commercial and/
or industrial areas.
Consequently, when this equipment is used in a residential area or in an adjacent area thereto, radio
interference may be caused to equipment such as radios and TV receivers.
Federal Communications Commission (FCC) Compliance Notice: Radio Frequency
Notice
Note: This equipment has been tested and found to comply with the limits for a 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. If it is not installed and used in accordance with the instruction
manual, it may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference, in which case users will be required to take whatever
measures may be necessary to correct the interference at their own expense.
EN 55 022 Statement
This is to certify that the NETGEAR Model EN104 hub, Model EN108 hub, and Model EN116 hub are
shielded against the generation of radio interference in accordance with the application of Council Directive
89/336/EEC, Article 4a. Conformity is declared by the application of EN 55 022 Class A (CISPR 22).
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 appropriate measures.
Canadian Department of Communications Radio Interference Regulations
This digital apparatus (NETGEAR Model EN104 hub, Model EN108 hub, and Model EN116 hub) does not
exceed the Class A limits for radio-noise emissions from digital apparatus as set out in the Radio Interference
Regulations of the Canadian Department of Communications.
Règlement sur le brouillage radioélectrique du ministère des Communications
Cet appareil numérique (NETGEAR Model EN104 hub, Model EN108 hub, et Model EN116 hub) respecte
les limites de bruits radioélectriques visant les appareils numériques de classe A prescrites dans le Règlement
sur le brouillage radioélectrique du ministère des Communications du Canada.
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
NETGEAR, Inc.
4500 Great America Parkway
Santa Clara, CA 95054
USA
Phone: 1-888-NETGEAR
E-mail: Support@NETGEAR.com
http://www.NETGEAR.com
*M-EN100NA-3*
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