NETGEAR EN104 - Hub - EN User manual

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Congratulations on your purchase of the NETGEAR™Model EN104, Model EN108, or Model
EN116 Ethernet hub. The hubs deliver standards-based, plug-and-play networking solutions for
small businesses, home offices, and low-density 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.
The Model EN104/EN108/EN116 hub has the following features:
• Four (on the ModelEN104 hub), eight (on the Model EN108 hub), and sixteen(on theModel
EN116 hub) vista 10BASE-T network ports (RJ-45) that 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
• 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 five-year warranty on the unit and one-year warranty on the power supply
Start Here
Features
Package Contents
8731FA
Power
adapter
and cord
Mounting kit
Model EN116 hub
Model EN104 hub Model EN108 hub
or
or
Pwr
Col
EN104
10BASE-T HUB LINK Rx
1234 56 78
Pwr
Col
EN108
10BASE-T HUB LINK Rx
1234 56 78
Pwr
Col
EN116
10BASE-T HUB
1234 56 78
LINK Rx
Installation guide,
Warranty & Owner
Registration Card,
Support Information
Card

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
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 Ωterminator (only if you have purchased the Model EN108
hub or the Model EN116 hub)
• This installation guide
• Warranty & Owner Registration Card
• Support Information Card
• Power adapter and cord
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.
Product Illustration
8732FA
Front Panel of the Model EN104 hub
Front Panel of the Model EN108 hub
Front Panel of the Model EN116 hub
Pwr (Power) Normal/Uplink
push button
Col (Collision) Pwr
Col
EN104
10 BASE-T HUB LINK Rx
1234 56 78
Pwr
Col
EN108
10 BASE-T HUB LINK Rx
1234 56 78
Pwr
Col
EN116
10 BASE-T HUB
1234 56 78
LINK Rx
10BASE-T ports
8724EA
Link
LED Rx LED

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
LEDs
The table below describes the activity of the LEDs.
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 Model EN104 hub, port 8 on the Model EN108 hub, or
port 16 on the Model EN116 hub. 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.
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.
Label Color Activity Description
Pwr (Power) Green On Power is supplied to the hub.
Col (Collision) Amber Blinking Data collision is occurring on the network. Note
that occasional collisions are normal.
Link
(located on the top left
corner of each vista
10BASE-T port)
Green On The link between this port and the connected
device is good.
Rx
(located on the top right
corner of each vista
10BASE-T port)
Green Blinking There is incoming data on the port.
Active
(for BNC) Green On The link between the BNC port and the
connected device is good.
Rx
(for BNC) Green Blinking There is incoming data on the BNC port.
Active
(for AUI) Green On The link between the AUI port and the
connected device is good.
Rx
(for AUI) Green Blinking There is incoming data on the AUI port.

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
The rear panel also includes a DC power receptacle.
Before you begin installing your hub, prepare the installation site. Make sure your operating
environment meets the operating environment requirements of the equipment.
Characteristic Requirement
Temperature Ambient temperature between 0°and 40°C (32°and 104°F).
No nearby heat sources such as direct sunlight, warm air exhausts,
or heaters.
Operating humidity Maximum relative humidity of 90%, noncondensing.
Ventilation Minimum 2 inches (5.08 cm) on all sides for cooling.
Adequate airflow in room or wiring closet.
Operating conditions At least 6 feet (1.83 m) to nearest source of electromagneticnoise
(such as photocopy machine or arc welder).
Service access Minimum 12 inches (19.68 cm) front and back for service access
and maintenance. Front and back clearance for cables and wiring
hardware such as punchdown blocks.
Power Adequate power source within 6 feet (1.83 m).
Wiring hardware Wiring hardware, such as punchdown blocks or patch panels,
should be complete before installing the hub.
AUI BNC
Active 12Vdc 1.2A
Rx
Active
Rx
– +
BNC
Active 12Vdc 1.2A
Rx
– +
8738FA
AUI port
Rear Panel of the Model EN104 hub
Rear Panel of the Model EN108 hub
Rear Panel of the Model EN116 hub
AUI port LEDs
BNC port
BNC port LEDs
Power receptacle
AUI BNC 12Vdc 1.2A
– +
Active
Rx
Active
Rx
Installation Procedures
Prepare the Site
The rear panel also includes a DC power receptacle.
Before you begin installing your hub, prepare the installation site. Make sure your operating
environment meets the operating environment requirements of the equipment.
Characteristic Requirement
Temperature Ambient temperature between 0°and 40°C (32°and 104°F).
No nearby heat sources such as direct sunlight, warm air exhausts,
or heaters.
Operating humidity Maximum relative humidity of 90%, noncondensing.
Ventilation Minimum 2 inches (5.08 cm) on all sides for cooling.
Adequate airflow in room or wiring closet.
Operating conditions At least 6 feet (1.83 m) to nearest source of electromagneticnoise
(such as photocopy machine or arc welder).
Service access Minimum 12 inches (19.68 cm) front and back for service access
and maintenance. Front and back clearance for cables and wiring
hardware such as punchdown blocks.
Power Adequate power source within 6 feet (1.83 m).
Wiring hardware Wiring hardware, such as punchdown blocks or patch panels,
should be complete before installing the hub.
AUI BNC
Active 12Vdc 1.2A
Rx
Active
Rx
– +
BNC
Active 12Vdc 1.2A
Rx
– +
8738FA
AUI port
Rear Panel of the Model EN104 hub
Rear Panel of the Model EN108 hub
Rear Panel of the Model EN116 hub
AUI port LEDs
BNC port
BNC port LEDs
Power receptacle
AUI BNC 12Vdc 1.2A
– +
Active
Rx
Active
Rx
Installation Procedures
Prepare the Site

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
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 hole 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. Be sure to choose a location that is near the devices to be connected, is
close to an electrical outlet, and provides at least 2 inches of space all around the hub for
ventilation.
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 straight-through 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.
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.
Note: Ethernet specifications limit the cable length between your PC or server and
the hub to 328 feet (100 meters) in length.
Install the Hub
Connect a PC to the Hub
Normal/Uplink
1234
Pwr
Col 5678
8734FA
(The Model EN108 hub is
shown in the illustration.)
Connect the Hub to a NetworkConnect the Hub to a Network

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
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.
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.
Connecting Port
on the Hub Connecting Device Cable Used
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 Port Connecting Device Cable Used
Port 4, port 8, or port 16
set to Normal PC, server, or router Straight-through cable
Port 4, port 8, or port 16
set to Uplink Hub or switch Straight-through cable
Note: Ethernet specifications limit the number of hubs with twisted pair links in any
communication path to five, as shown in the example. 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 (or five paths).
1234 5678
Pwr
Col
EN116
10BASE-T HUB
1234 5678
LINK Rx
1234 56 78
Pwr
Col
EN108TP
10BASE-T HUB
1234 56 78
Pwr
Col
EN108TP
10BASE-T HUB
8735FA
AB
Model EN108 hub
Model EN104 hub Model EN104 hub
Model EN116 hub
Model EN108 hub
Uplink
Normal
UplinkUplink
Uplink

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
The following illustration shows cascading hubs together daisy-chain style and indicates the
setting of the Normal/Uplink push button on each hub.
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 Ωterminator terminates the
connection at each 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.
Note: Ethernet specifications limit a BNC segment to 30 BNC 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.
Pwr
Col
EN104
10 BASE-T HUB LINK Rx
1234 56 78
Pwr
Col
EN108
10 BASE-T HUB LINK Rx
1234 56 78
Pwr
Col
EN116
10 BASE-T HUB
1234 56 78
LINK Rx
8733FA
Model EN108 hub
Model EN116 hub
Model EN104 hub
Uplink
Uplink
Normal
8736FA
BNC 50 terminator
BNC T- connector
BNC 50 terminator Model EN104 hub
Model EN108 hub
Model EN116 hub

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.
To complete the installation, connect the power 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 there are any problems, refer to “Troubleshooting Information.”
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.
Note: Ethernet specifications limit thick coaxial segments to 100 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).
8737FA
AUI cable
10BASE-5
transceiver
Cable terminator device
Model EN108 hub and Model EN116 hubs
Thick
coaxial
cable
Verify Installation

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Refer to this table and the information that follows the table to troubleshoot your hub.
Symptom Cause Solution
Amber Col LED
blinks. There is data collision on the network. Data collision is normal on Ethernet networks. No action is required.
AmberColLEDblinks
excessively. 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.
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.
Wrong or miswired
cables are used. 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
cables can cause a collision condition and
cannot be used in place of UTP cables.
Green Link LED is
off when a cable is
attached.
The port is not detecting
a successful link. 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.
GreenLinkLEDisnot
blinking when there is
data transmission.
The port is not detecting
data transmission. 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.
Green Active LED on
the BNC port is not
on when the port is
connected.
The port is not detecting
a successful link. Make sure that each segment is terminated with a BNC 50 terminator at both ends. Check
for a bad cable.
Green Rx LED on
the BNC port is not
blinking when there is
data transmission.
The port is not detecting
data transmission. Check for a bad cable or loose connectors. Make sure that there is power to both the hub
andthe connected device.
Green Active LED on
the AUI port is not
on when the port is
connected.
The port is not detecting
a successful link. 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 for instructions on
setting the SQE.
Green Rx LED on the
AUI port is not
blinking when there is
data transmission.
The port is not detecting
data transmission. Check for a bad cable or loose connectors. Make sure that there is power to both the hub
andthe connected device.
Troubleshooting Information