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 Model EN104 hub), eight (on the Model EN108 hub), and
sixteen (on the
Model 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 lifetime warranty on the unit and three-year warranty on the power
supply
Start Here
Features

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 Ω
terminator (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
Package Contents
8731FA
Power
adapter
Mounting kit
Model EN116 hub
Model EN104 hub Model EN108 hub
or
or
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
Installation guide,
Warranty & Owner
Registration Card,
Support Information
Card

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
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
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
Pwr (Power) Normal/Uplink
push button
Col (Collision)
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.
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
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.
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

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Before you begin installing your hub, prepare the installation site. Make sure
your operating environment meets the operating environment requirements of
the equipment.
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
e 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.
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 electromagnetic
noise (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.
Installation Procedures
Prepare the Site
Install the Hub

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
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.
Note: Ethernet specifications limit the cable length between your PC
or server and the hub to 328 feet (100 meters) in length.
Connect a PC to the Hub
Normal/Uplink
1234
Pwr
Col5678
8734FA
(The Model EN108 hub is
shown in the illustration.)

Model EN104/EN108/EN116 Ethernet Hub Installation Guide
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.
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
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
Connect the Hub to a Network

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.
The following illustration shows cascading hubs together daisy-chain style and
indicates the setting of the Normal/Uplink push button on each hub.
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.
1234 56 78
Pwr
Col
EN116
10 BASE-T HUB
1234 56 78
LINK Rx
1234 56 78
Pwr
Col
EN108
TP
10 BASE-T HUB
1234 56 78
Pwr
Col
EN108
TP
10 BASE-T HUB
8735FA
AB
Hub 2
Hub 4 Hub 5
Hub 1
Hub 3
Uplink
Normal
UplinkUplink
Uplink
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