3Com 3CNJPSE24 Manuale utente
Ethernet Power Supply
3CNJPSE24
User s Guide
3Com Corporation 5400 Bayfront Plaza
Santa Clara, California 95052-8145 U.S.A.
Copyright ' 2001 3Com Corporation. All rights reserved. No part of this
documentation may be reproduced in any form or by any means or used to make
any derivative work (such as translation, transformation, or adaptation) without
written permission from 3Com Corporation.
3Com Corporation reserves the right to revise this documentation and to make
changes in content from time to time without obligation on the part of 3Com
Corporation to provide notification of such revision or change.
3Com Corporation provides this documentation without warranty, term, or condition
of any kind, either implied or expressed, including, but not limited to, the implied
warranties, terms or conditions of˚merchantability, satisfactory quality, and fitness for
a particular purpose. 3Com may make improvements or changes in the product(s)
and/or the program(s) described in this documentation at˚any time.
If there is any software on removable media described in this documentation, it is
furnished under a license agreement included with the product as a separate
document, in the hard copy documentation, or on the removable media in a directory
file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy,
please contact 3Com and a copy will be provided to you.
UNITED STATES GOVERNMENT LEGEND
If you are a United States government agency, then this documentation and the
software described herein are provided to you subject to the following:
All technical data and computer software are commercial in nature and developed
solely at private expense. Software is delivered as Commercial Computer Software
as defined in DFARS 252.227-7014 (June 1995) or as˚a˚ commercial item as
defined in FAR˚2.101(a) and as such is provided with only such rights as are
provided in˚3Com s standard commercial license for the software. Technical data is
provided with limited rights only as provided in DFAR 252.227-7015 (Nov˚1995) or
FAR 52.227-14 (June 1987), whichever is applicable. You agree not to remove or
deface any portion of any legend provided on any licensed program or
documentation contained in, or delivered to you in conjunction with, this user guide.
Unless otherwise indicated, 3Com registered trademarks are registered in the United
States and may or may not be registered in other countries.
3Com is a registered trademark and the 3Com logo is a trademark of
3Com˚Corporation. All other company and product names may be trademarks of the
respective companies with which they are associated.
Contents
About this Guide ...........................................................................................i
Purpose .......................................................................................................i
Prerequisite Skills and Knowledge.............................................................i
Technical Support ...................................................................................... ii
Introduction to the Ethernet Power Supply ......................................... 1-1
About the Ethernet Power Supply ......................................................... 1-1
Power Management System ................................................................. 1-2
Ethernet Power Supply Front View Detail ........................................ 1-3
Ethernet Power Supply Rear View Detail ......................................... 1-7
Installing the Ethernet Power Supply ................................................... 2-1
Verifying Kit Contents ............................................................................ 2-1
Recording Identification Information...................................................... 2-1
Powering Up........................................................................................... 2-2
Connecting Cables to the Ethernet Power Supply ............................... 2-3
Safety Information ...................................................................................A-1
Technical Specifications.........................................................................B-1
Overview.................................................................................................B-1
Hardware Specifications ........................................................................B-1
Physical Specifications.......................................................................B-1
Environmental Specifications.............................................................B-1
Electrical Specifications .........................................................................B-2
Ethernet Interface...............................................................................B-2
Troubleshooting.......................................................................................C-1
Introduction.............................................................................................C-1
Troubleshooting Table ...........................................................................C-2
About This Guide
Ethernet Power Supply User s Guide i
About this Guide
Purpose
This guide provides information and procedures on hardware
installation, setup, configuration, and management of the Ethernet
Power Supply.
Prerequisite Skills and Knowledge
The guide is intended for use by network administrators who are
responsible for installing and setting up network equipment;
consequently, a basic working knowledge of LANs (Local Area
Networks) has been assumed.
To use this guide effectively, you should have a working
knowledge of Ethernet infrastructures. In addition, you should:
— Have a working knowledge of basic electronics and
mechanical assembly as well as an understanding of
related local building codes.
— Be familiar with local operating and troubleshooting
procedures.
Technical Support
ii Ethernet Power Supply User s Guide
Technical Support
3Com provides easy access to technical support information
through a variety of services. This section describes these
services.
Information contained in this section is correct at time of
publication. For the most recent information, 3Com recommends
that you access the 3Com Corporation World Wide Web site.
One-Year Free Installation Support
3Com provides free installation and troubleshooting telephone
support for this product for 90 (ninety) days from the date of
purchase.
Hours of operation are subject to change. See Support from
3Com later in this section.
Online Technical Services
3Com offers worldwide product support 24 hours a day, 7˚days a
week, through the following online systems:
•World Wide Web site
•3Com Knowledgebase Web Services
•3Com FTP site
World Wide Web Site
To access the latest networking information on the 3Com
Corporation World Wide Web site, enter this URL into your Internet
browser: http://www.3com.com/
This service provides access to online support information, such
as technical documentation and a software library, as well as
support options that range from technical education to
maintenance and professional services.
About This Guide
Ethernet Power Supply User s Guide iii
Knowledgebase Web Services
This interactive tool contains technical product information
compiled by 3Com expert technical engineers around
the˚globe.˚Located on the World Wide Web at http://
knowledgebase.3com.com, this service gives all 3Com customers
and partners complementary, around-the-clock access˚to technical
information on most 3Com products.
3Com FTP Site
Download drivers, patches, software, and MIBs across the Internet
from the 3Com public FTP site. This service is available 24 hours a
day, 7 days a week.
To connect to the 3Com FTP site, enter the following information
into your FTP client:
•Host name: ftp.3com.com
•User name: anonymous
•Password: <your Internet e-mail address>
NOTE: You do not need a user name and password with Web
browser software, such as Netscape Navigator and Microsoft
Internet Explorer.
Support from Your Network Supplier
If you require additional assistance, consult your network supplier.
Many suppliers are authorized 3Com service partners who are
qualified to provide a variety of services, including network
planning, installation, hardware maintenance, application training,
and support services.
When you contact your network supplier for assistance, have the
following information ready:
•Product model name, part number, and serial number
•A list of system hardware and software, including revision
levels
•Diagnostic error messages
•Details about recent configuration changes, if applicable
If you are unable to consult your network supplier, see the
following section on how to contact 3Com.
Technical Support
iv Ethernet Power Supply User s Guide
Support from 3Com
If you are unable to obtain assistance from the 3Com online
technical resources or from your network supplier, 3Com offers
technical telephone support services. To find out more about your
support options, call the 3Com technical telephone support phone
number:
1 800 527 8677
When you contact 3Com for assistance, have the following
information ready:
•Product model name, part number, and serial number
•A list of system hardware and software, including revision
levels
•Diagnostic error messages
•Details about recent configuration changes, if applicable
Returning Products for Repair
Before you send a product directly to 3Com for repair, you must
first obtain an authorization number. Products sent to 3Com
without authorization numbers will be returned to the sender
unopened, at the sender s expense. To obtain an authorization
number, call:
1 800 527 8677
Introduction to the Ethernet Power Supply
Ethernet Power Supply User s Guide 1-1
Introduction to the
Ethernet Power Supply
This chapter contains introductory information about the
Ethernet Power Supply and how it can be used in your network.
It covers the following topics:
-About the Ethernet Power Supply
-Ethernet Power Supply Front View Detail
-Ethernet Power Supply Rear View Detail
-Network Configuration Examples
About the Ethernet Power Supply
The Ethernet Power Supply is a 24-port Ethernet-channel, 48V-
power-feeding device. This device is designed for use with a
10/100BASE-TX standard Ethernet network over a standard
TIA/EIA-568 Category 5 cabling plant. The DC operating power
for the data terminal units is fed through the unused pairs (7/8
and 4/5).
The Ethernet Power Supply normally powers devices that are
enabled for Power Over LAN or are equipped to receive power
over Ethernet. These devices are called Powered Data
Terminal Equipment (PDTE). Devices that are not equipped to
receive power over Ethernet require local power or an external
splitter to be powered by the Ethernet Power Supply.
NOTE: The Ethernet Power Supply is not a data hub or switch;
it is a power distribution device to be used in conjunction with a
data hub or switch. The Ethernet Power Supply adds power to
unused wires and passes through data from the ports on an
Ethernet or Fast Ethernet hub or switch using standard 8-wire,
category 5 cables. Do not use crossover cables.
1
Introduction to the Ethernet Power Supply
1-2 Ethernet Power Supply User s Guide
Ethernet Power Supply main features:
-Remote power feeding of Ethernet terminals
-No need for terminal s AC outlets, UPS and AC/DC
adapters
-24 10/100BASE-TX data plus power-combined channels
-Universal 100-240VAC, 50/60Hz power input
-Power management system
-Independent overload and short-circuit protection for each
channel
-Port status indications
-Standard 19 1U rack mountable
Power Management System
The total power required by PDTEs may exceed the total power
available from the Ethernet Power Supply. The Power
Management System does not allow the total power output to
exceed the maximum power available (200W). When the total
power available is near maximum, attempts to connect an
additional PDTE to an empty port causes the appropriate LED
of the port to blink orange, indicating out-of-power budget and
this port does not deliver power. Power distribution is based on
first-come, first-served logic. Disconnection of other PDTEs or
dropping the power use down on connected PDTEs so that the
maximum power allowed for a single port is again available
allows the connection of the new port automatically.
Should connected and operating PDTEs suddenly raise their
power requirements significantly during operation, such that the
power required exceeds the power available, the Ethernet
Power Supply begins to turn off ports starting from port 24
down until the power is again inside the limit available. These
ports resume operation when power is again available.
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