NETGEAR EN516 - Hub - EN User manual

M-EN516NA-1
September 2000
NETGEAR
NETGEAR Inc.
4500 Great America Parkway
Santa Clara, CA 95054
USA
Phone: 1-888-NETGEAR
E-mail: [email protected]
www.NETGEAR.com
Installation Guide
for the Model EN516
Ethernet Hub

ii
© 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. All rights reserved.
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.
Federal Communications Commission (FCC) Statement
Note: This equipment has been tested and found to comply with the limits for a ClassA 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 Declaration of Conformance
This is to certify that the Bay Networks NETGEAR Model EN516 Ethernet Hub is 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 B (CISPR 22).
Compliance is dependent upon the use of shielded data cables.
Bestätigung des Herstellers/Importeurs
Es wird hiermit bestätigt, daß das NETGEAR Model EN516 Ethernet Hub gemäß der im BMPT-AmtsblVfg 243/1991
und Vfg 46/1992 aufgeführten Bestimmungen entstört ist. Das vorschriftsmäßige Betreiben einiger Geräte (z.B.
Testsender) kann jedoch gewissen Beschränkungen unterliegen. Lesen Sie dazu bitte dieAnmerkungen in der
Betriebsanleitung.
Das Bundesamt für Zulassungen in der Telekommunikation wurde davon unterrichtet, daß dieses Gerät auf den Markt
gebracht wurde und es ist berechtigt, die Serie auf die Erfüllung der Vorschriften hin zu überprüfen.
Die Erfüllung der zutreffenden Vorschriften hängt von der Benutzung geschirmter Kabel ab. Der Benutzer ist für den
Erwerb der entsprechenden Kabel verantwortlich.

iii
Certificate of the Manufacturer/Importer
It is hereby certified that the NETGEAR Model EN516 Ethernet Hub has 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.
Compliance with the applicable regulations is dependent upon the use of shielded cables. It is the responsibility of the
user to procure the appropriate cables.
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.
Customer Support
For assistance with installing and configuring your NETGEAR system or with post-installation questions or problems,
contact your point of purchase representative.
To contact customer support or to purchase additional copies of this document and publications for other NETGEAR
products, you can contact NETGEAR at the following numbers:
Phone
Australia: 1800-787-638
Austria: 00800-06384327
(00800-0-NETGEAR)
Denmark: 808-82179
Canada: 1-888-NETGEAR
Finland: 0800-111-036
France: 0800-77-17-53
World Wide Web
NETGEAR maintains a World Wide Web Home Page that you can access at the universal resource locator (URL) http://
www.NETGEAR.com. A direct connection to the Internet and a Web browser such as Mosaic or Netscape
are required.
Germany: 00800-06384327
(00800-0-NETGEAR)
Hong Kong: 001-800-1233-4566
Japan: 0120-66-5402
Korea: 00308-11-0319
Netherlands: 0800-023-0981
New Zealand: 00800-1233-4566
Norway: 800-12041
Singapore: 001-800-1233-4566
Sweden: 0200-298-298
Switzerland: 00800-0638-4327
(00800-0-NETGEAR)
United Kingdom: 020-7216-0014
United States: 1-888-NETGEAR
All Other Countries: [phone]

iv

Contents v
Contents
Chapter 1
Introduction
Features .........................................................................................................................1-1
Chapter 2
Physical Description
Front Panel .....................................................................................................................2-1
LED Indicators ..........................................................................................................2-2
RJ-45 Ports ..............................................................................................................2-3
Normal/Uplink Push Button ......................................................................................2-3
Rear Panel ......................................................................................................................2-4
Chapter 3
Installation
Preparing the Site ...........................................................................................................3-1
Package Contents ..........................................................................................................3-1
Required Tools ................................................................................................................3-2
Installing the Hub ............................................................................................................3-2
Installing the Hub on a Flat Surface .........................................................................3-3
Installing the Hub in a Rack .....................................................................................3-3
Connecting the Hub ........................................................................................................3-4
Connecting to the RJ-45 Ports .................................................................................3-4
Connecting to the BNC Port .....................................................................................3-7
Connecting to the AUI Port .......................................................................................3-9
Connecting to Other NETGEAR Products .............................................................3-10
Completing and Verifying the Installation ......................................................................3-11

vi Contents
Chapter 4
Troubleshooting
Front Panel LEDs ...........................................................................................................4-1
Collision LED ............................................................................................................4-1
Link/Rx LED for the RJ-45 Ports ..............................................................................4-2
AUI Rx LED and BNC Rx LED for the AUI and BNC Ports ......................................4-2
Partition LED for the RJ-45 Ports .............................................................................4-2
Partition LED for the BNC Port .................................................................................4-2
Partition LED for the AUI Port ..................................................................................4-3
Installation ......................................................................................................................4-3
Cabling ...........................................................................................................................4-3
Network Interface Cards .................................................................................................4-4
Configuration ..................................................................................................................4-4
Hub Integrity ...................................................................................................................4-4
Appendix A
Technical Specifications
General Specifications ................................................................................................... A-1
Appendix B
Cabling Specifications
Cable Specifications ...................................................................................................... B-1
Twisted Pair Cables ....................................................................................................... B-2
50 Ω Coaxial Cable ........................................................................................................ B-3
AUI Cable ...................................................................................................................... B-3
Appendix C
Connector Pin Assignments
RJ-45 Connector ...........................................................................................................C-1
AUI Connector ...............................................................................................................C-2
BNC Connector .............................................................................................................C-3
BNC T-Connector and 50 Ω Terminator .........................................................................C-4
Index

Figures vii
Figures
Figure 2-1. Front panel of the Model EN516 hub .......................................................2-1
Figure 2-2. Rear panel of the Model EN516 hub ........................................................2-4
Figure 3-1. Installing mounting brackets to the hub and to a rack ..............................3-4
Figure 3-2. Connecting a workstation to an RJ-45 port on the Model EN516 hub .....3-5
Figure 3-3. Cascading multiple hubs in a hierarchical star through the RJ-45 ports ..3-6
Figure 3-4. Cascading multiple hubs daisy-chain style through the RJ-45 ports .......3-7
Figure 3-5. Cascading hubs through the BNC port ....................................................3-8
Figure 3-6. Cascading hubs through the AUI port ......................................................3-9
Figure 3-7. Connecting multiple NETGEAR products ..............................................3-10
Figure B-1. Straight-through twisted pair cable ......................................................... B-2
Figure B-2. Crossover twisted pair cable ................................................................... B-2
Figure C-1. RJ-45 connector ......................................................................................C-1
Figure C-2. AUI connector pin assignments ..............................................................C-2
Figure C-3. BNC connector ........................................................................................C-3
Figure C-4. 50 Ω terminator and BNCT-connector ....................................................C-4

viii Figures

Tables ix
Tables
Table 2-1. LED descriptions ......................................................................................2-2
Table B-1. Electrical requirements of Category 3, 4, and 5 cables .......................... B-1
Table B-2. Specifications of 10BASE2 (ThinNet) RG 58 A/U or RG 58 C/U
coaxial cable ........................................................................................... B-3
Table B-3. Specifications of AUI cable ..................................................................... B-3
Table C-1. RJ-45 connector pin assignments ...........................................................C-2
Table C-2. AUI connector pin assignments ..............................................................C-3

Introduction 1-1
Chapter 1
Introduction
Congratulations on your purchase of the NETGEAR
™
Model EN516 Ethernet Hub. The Model
EN516 hub is part of the NETGEAR 500 Series product family, which delivers standards-based,
plug-and-play networking solutions for small businesses, home offices, and low-density
workgroups of larger companies.
This guide describes how to install and use the hub and includes physical configuration guidelines
for stacking hubs, connecting Ethernet stations, and making network connections.
This guide is intended for individuals who have the following background and experience:
• Working knowledge of Ethernet
• Familiarity with 10BASE-T specifications
Features
Featuring a compact design, the Model EN516 hub offers all the features of a standard equipment
rack-mount hub at a significantly lower cost.
These features include:
• Sixteen IEEE 802.3-compliant 10BASE-T ports, providing effective information exchange,
resource sharing, and a client/server or peer-to-peer applications solution with simple
unshielded twisted pair (UTP) wiring
• Attachment unit interface (AUI) or coaxial BNC backbone support for connecting to an
existing Ethernet segment or external transceiver, or for network expansion
• Normal/Uplink push button for simplifying network extension and connecting with other hubs

Installation Guide for the Model EN516 Ethernet Hub
1-2 Introduction
• Built-in 100-240 V switching power supply, eliminating the need for bulky wall transformers
• Thirty-eight front panel light emitting diode (LED) indicators, providing real-time status of
the individual ports and overall hub status
• Plug-and-play with no software to configure
• Hub functions such as 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
• Ability to expand the network size by connecting multiple hubs together using twisted pair or
coaxial cabling
• Compact design, enabling easy tabletop or rack-mounting installation
• Limited five-year warranty on the unit and one-year warranty on the power supply

Physical Description 2-1
Chapter 2
Physical Description
This chapter describes the hardware features of the Model EN516 hub. The discussion of the
physical components of the hub is divided into two sections, “Front Panel” and “Rear Panel.” Use
the key at the bottom of each illustration to identify the associated component.
Front Panel
The front panel contains LEDs, 16 RJ-45 10BASE-T port connectors, and a Normal/Uplink push
button (Figure 2-1).
Key:
1 = LEDs (Power, BNC Rx, AUI Rx, Collision, BNC Partition, and AUI Partition)
2 = RJ-45 ports with Link/Rx and Partition LEDs on each port
3 = Normal/Uplink push button
Figure 2-1. Front panel of the Model EN516 hub
7432
Normal/Uplink
16
8
Link/Rx Partition Link/Rx Partition
9
1
Collision Partition Partition
Power BNC
Rx AUI Rx
Ethernet Hub
MODELEN516
16 PORT
10BASE-T
1 2 3

Installation Guide for the Model EN516 Ethernet Hub
2-2 Physical Description
LED Indicators
There are six LEDs on the front panel of the hub and two on each port connector that allow you to
identify:
•Status of the hub AC power supply
•Operational status of the hub
•Collision occurrence on an Ethernet segment indicating activity level
•Partitioning of a port as a result of excessive collision occurrence
•Data utilization of the Ethernet segment in a standalone hub or a stack of hubs
•Link and receive activity status for all ports in the hub
Table 2-1 describes each LED on the front panel of the hub.
Table 2-1. LED descriptions
Label Color Activity Description
Power Green On Power is supplied to the hub.
BNC Rx Green Blinking There is incoming data on the BNC port.
AUI Rx Green Blinking There is incoming data on the AUI port.
Collision Yellow Blinking There is data collision on the network.
Note that occasional collisions are normal.
BNC Partition Yellow On The BNC port is being partitioned because
of excessive collisions, or when the BNC
port is not connected.
AUI Partition Yellow On The AUI port is being partitioned because of
excessive collisions.
Link/Rx (located on
top left corner of each
RJ-45 port)
Green On
Blinking
The link between this port and the other
connecting port is good.
There is incoming data on the port.
Partition (located on
top right corner of each
RJ-45 port)
Yellow On The port is being partitioned because of
excessive collisions.

Installation Guide for the Model EN516 Ethernet Hub
Physical Description 2-3
RJ-45 Ports
The front panel of the Model EN516 hub provides 16 RJ-45 10BASE-T ports. Two LEDs, the
Link/Rx LED and the Partition LED, are positioned at the top corners of each RJ-45 connector.
Both LEDs are described in Table 2-1.
Normal/Uplink Push Button
The Normal/Uplink push button on the Model EN516 hub allows you to select Normal (MDI-X)
or Uplink (MDI) wiring for port 16, eliminating the need to use a crossover cable to connect
similarly wired devices. Port 16 is configured for Normal wiring when the push button is in the out
position. When the push button is pressed in, Port 16 is configured for Uplink wiring.
Ports 1 to 15 on the hub cannot be configured for Uplink wiring. If you are using one of these ports
to connect to a Normal port in another hub, you must use an RJ-45 crossover cable to connect the
two ports. See Figure B-2 for crossover cable information.

Installation Guide for the Model EN516 Ethernet Hub
2-4 Physical Description
Rear Panel
The rear panel of the Model EN516 hub (refer to Figure 2-2) provides two ports, theAUI port and
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.You can use the BNC port to connect to a backbone network or other PCs using thin
coaxial cable. The rear panel also includes anAC power receptacle. The hub accepts between 100
and 240 V AC, 50/60 Hz.
Key:
1 = AUI port
2 = BNC port
3 = AC power receptacle
Figure 2-2. Rear panel of the Model EN516 hub
7147
1 2 3
AUI BNC
100-240 VAC 50-60 Hz 0.15A

Installation 3-1
Chapter 3
Installation
This chapter provides information on:
•Preparing the site
•Package contents
•Required tools
•Installing the hub
•Connecting the hub
•Completing and verifying the installation
Preparing the Site
Before you begin installing the Model EN516 hub, prepare the installation site. Make sure the
operating environment meets the physical requirements of the hub. The ambient temperature must
be between 0 ° C and 40 ° C. The maximum relative humidity must not exceed 90%.
You can install the hub on a flat surface, such as a tabletop or shelf, or within a standard 19-inch
rack.You should ensure that the front and rear panel of all units to be connected are easily
accessible for connecting cables and power and for monitoring the LED indicators.
Package Contents
The package should contain the following items:
•Model EN516 hub
•This manual

Installation Guide for the Model EN516 Ethernet Hub
3-2 Installation
•AC power cord
•Rack mount kit
•Four rubber pads for installation on a flat surface
•One BNC T-connector
•One BNC terminator
•Warranty and Owner Registration Card
Call your dealer if there are any wrong, missing, or damaged parts. Keep the carton, including the
original packing materials. Use them to repack the hub if there is a need to return it for repair.
Be sure to complete the Owner Registration Card and return it to NETGEAR to qualify for product
updates and product warranty registration.
RequiredTools
To install the hub on a flat surface, you do not need any special tools. However, to install the hub in
a rack, you need the following tools:
•#1 Phillips screwdriver to attach mounting brackets
•#2 Phillips screwdriver to tighten mounting screws
Installing the Hub
To install the Model EN516 hub, follow these steps:
1.
Unpack the hub.
2.
Choose a location near the devices to be connected and close to an electrical outlet.
3.
Follow the instructions for installing the hub on a flat surface or in a rack.
Caution:
Use the appropriate power cord as required by your national electrical codes
and ordinances.

Installation Guide for the Model EN516 Ethernet Hub
Installation 3-3
Installing the Hub on a Flat Surface
To install the hub on a flat surface such as a tabletop or shelf, follow these steps:
1.
Install self-adhesive pads on the bottom of the hub.
Peel off the protective backing from the rubber pads and apply one at each marked location on
the bottom of the hub.
2.
Set the hub on a tabletop or shelf so that it has at least 2 inches (5 cm) of space on all
sides.
Restricted air flow could cause overheating.
3.
Install any PCs, additional hubs, or other devices in your stack.
For information on connecting the hub, refer to “Connecting the Hub”on page 3-4.
Installing the Hub in a Rack
To install the hub in a rack, follow these steps:
1.
Attach the mounting brackets (supplied in the rack mounting kit) to the sides of the hub
using the screws provided.
Hold a mounting bracket against each side of the hub, as shown in Figure 3-1, and align the
countersunk screw holes in the bracket with the bracket mounting holes in the hub. Use a #1
Phillips screwdriver to tighten the screws to secure each bracket.
2.
Attach the hub (with the mounting bracket) to the rack using two pan-head screws with
nylon washers.
Use a #2 Phillips screwdriver and tighten the screws to secure the hub to the rack.
3.
Install any PCs, additional hubs, or other devices in your stack.
For information on connecting the hub, refer to “Connecting the Hub”on page 3-4.

Installation Guide for the Model EN516 Ethernet Hub
3-4 Installation
.
Figure 3-1. Installing mounting brackets to the hub and to a rack
Connecting the Hub
This section discusses connecting to the hub, cascading to multiple hubs, and connecting to other
NETGEAR products. For instructions on connecting to the ports or connecting to other
NETGEAR products, refer to the following sections:
•“Connecting to the RJ-45 Ports”on this page
•“Connecting to the BNC Port”on page 3-7
•“Connecting to the AUI Port”on page 3-9
•“Connecting to Other NETGEAR Products”on page 3-10
Connecting to the RJ-45 Ports
You can connect PCs, Apple Macintosh computers, UNIX workstations, and any device equipped
with a 10BASE-T Ethernet interface to the RJ-45 ports on the Model EN516 hub using twisted
pair Ethernet cables.
The twisted pair cable extended from an RJ-45 port (or UTP port) is called a twisted pair segment
and can be up to 100 m in length. The UTP ports, with the exception of port 16, are MDI-X (or
Normal) ports. To connect any of the Normal ports to a PC, a server, or another device with an
MDI (or Uplink) port, you can simply use a regular UTP cable. To connect any of the Uplink ports
to another Uplink port, use an RJ-45 crossover cable.
7171
Normal/Uplink
16
8
Link RX
Link RX
9
1
Power Data Collision