Regulatory Notices, Products | 3Com 10BASE-T specification

the defective product is different from the fee-based Advance Hardware Replacement Service, which is available as a contracted service offering.

INCLUDED SERVICES:

3Com's Electronic Support Services, available at no charge, include 3Com Knowledgebase, information on known bugs, documentation, release notes, and publicly available software and firmware upgrades. 3Com reserves the right to modify or cancel this offering at any time, without advance notice.

Telephone Technical Support, with coverage for basic troubleshooting only, will be provided at no additional charge for 12 months from the date of purchase, on a commercially reasonable efforts basis. Telephone support is provided by 3Com only if Customer purchased this product directly from 3Com, or if Customer's reseller is unable to provide telephone support. To qualify for this telephone technical support, Customer must register on the 3Com Web site at http://support.3Com.com/index.htm, and state the date of purchase, product number, and serial number. 3Com's response to a request for telephone technical support will be in the form of a return call from a 3Com representative by close of business the following business day, defined as 9 a.m. to 5 p.m., local time, Monday through Friday, excluding local holidays. Please refer to the Technical Support appendix in the User Guide for telephone numbers.

Software Updates, All software and firmware upgrades and the latest code for this product downloaded through the 3Com Software Library.

WARRANTIES EXCLUSIVE: IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER'S SOLE REMEDY FOR BREACH OF THAT WARRANTY SHALL BE REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM'S OPTION. TO THE FULL EXTENT ALLOWED BY LAW, THE FOREGOING WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR CONDITIONS, EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING WARRANTIES, TERMS, OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, SATISFACTORY QUALITY, CORRESPONDENCE WITH DESCRIPTION, AND NON-INFRINGEMENT, ALL OF WHICH ARE EXPRESSLY DISCLAIMED. 3COM NEITHER ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE OR USE OF ITS PRODUCTS.

3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THAT THE ALLEGED DEFECT OR MALFUNCTION IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY CUSTOMER'S OR ANY THIRD PERSON'S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING,

UNAUTHORIZED ATTEMPTS TO OPEN, REPAIR OR MODIFY THE PRODUCT, OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING, POWER CUTS OR OUTAGES, OTHER HAZARDS, OR ACTS OF GOD.

LIMITATION OF LIABILITY: TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY LIABILITY, WHETHER BASED IN CONTRACT OR TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OR PROFITS, LOSS OF BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE, OR INTERRUPTION OF ITS PRODUCTS, EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, AND LIMITS ITS LIABILITY TO REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM'S OPTION. THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE AFFECTED IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE.

DISCLAIMER: Some countries, states, or provinces do not allow the exclusion or limitation of implied warranties or the limitation of incidental or consequential damages for certain products supplied to consumers, or the limitation of liability for personal injury, so the above limitations and exclusions may be limited in their application to you. When the implied warranties are not allowed to be excluded in their entirety, they will be limited to the duration of the applicable written warranty. This warranty gives you specific legal rights which may vary depending on local law.

GOVERNING LAW: This Limited Warranty shall be governed by the laws of the State of California, U.S.A., and by the laws of the United States, excluding their conflicts of laws principles. The United Nations Convention on Contracts for the International Sale of Goods is hereby excluded in its entirety from application to this Limited Warranty.

3Com Corporation

5400 Bayfront Plaza P.O. Box 58145

Santa Clara, CA 95052-8145 (408) 326-5000

August 2000

3Com reserves the right to modify or cancel this offering at any time, without advance notice. This offering is not available where prohibited or restricted by law.

REGULATORY NOTICES

FCC Statement

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 and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference to radio communications, in which case the user will be required to correct the interference at their own expense.

Information To The User

If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

■Reorient the receiving antenna.

■Relocate the equipment with respect to the receiver.

■Move the equipment away from the receiver.

■Plug the equipment into a different outlet so that equipment and receiver are on different branch circuits.

If necessary, the user should consult the dealer or an experienced radio/television technician for additional suggestions. The user may find the following booklet prepared by the Federal Communications Commission helpful:

How to Identify and Resolve Radio-TV Interference Problems

This booklet is available from the U.S. Government Printing Office, Washington, DC 20402, Stock No. 004-000-00345-4.

In order to meet FCC emissions limits, this equipment must be used only with cables which comply with IEEE 802.3.

CE Statement (Europe)

This product complies with the European Low Voltage Directive 73/23/EEC and ETIC Directive 89/336/EEC as amended by European Directive 93/68/EEC/.

CSA Statement

This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.

Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

VCCI Statement

BSMI Statement

PRODUCTS

The SuperStack 3 Baseline 10/100 Switch 24 Port 10BASE-T/100BASE-TX plus 1-Port 1000BASE-T is part of the extensive SuperStack 3 range of 3Com products. This range includes hubs, switches, power systems and other networking equipment, and is continually being developed. Contact your supplier for the latest product information and to order these products.

Product Registration

You can now register your SuperStack 3 Switch on the 3Com web site to receive up-to-date information on your product:

http://www.support.3com.com/warrantyregistration/register.pl

Year 2000 Compliance

For information on Year 2000 compliance and 3Com products, visit the 3Com Year

2000 Web page:

http://www.3com.com/products/yr2000.html

Feedback

Your suggestions are very important to us. They will help make our documentation more useful to you. Please e-mail comments about this document to 3Com at:

pddtechpubs_comments@3Com.com

Please include the following information when commenting: the document title, part number (shown at the bottom of page 8), and page number, if appropriate.

Environmental Statement

It is the policy of 3Com Corporation to be environmentally-friendly in all operations. To uphold our policy, we are committed to:

■Establishing environmental performance standards that comply with national legislation and regulations.

■Conserving energy, materials and natural resources in all operations.

■Reducing the waste generated by all operations.

■Ensuring that all waste conforms to recognized environmental standards.

■Maximizing the recyclable and reusable content of all products.

■Ensuring that all products can be recycled, reused and disposed of safely.

■Ensuring that all products are labelled according to recognized environmental standards.

■Improving our environmental record on a continual basis.

10BASE-T specifications

3Com 10BASE-T is a networking technology that plays a foundational role in local area networks (LANs). Introduced in the early 1990s, it quickly became one of the most widely adopted Ethernet standards, enabling reliable data transmission over twisted-pair cabling. Designed to operate at speeds of 10 megabits per second, 10BASE-T facilitated the transition from older coaxial cable systems to more flexible cabling options, paving the way for more robust and scalable network infrastructures.

One of the defining features of 3Com 10BASE-T is its use of unshielded twisted pair (UTP) cabling, specifically Category 3 cabling at its inception. This choice of cabling allowed for easier installation and lower costs compared to coaxial cables. Furthermore, the standardized cabling allows for distances of up to 100 meters between network devices, making it suitable for various office layouts. The connectors used with 10BASE-T networks are RJ-45 connectors, which have become a staple in networking.

Another characteristic of 10BASE-T is its method of signaling. It employs Manchester encoding, which speeds up error detection and improves resilience against noise. This coding scheme allows for the transmission of 0s and 1s over a single twisted pair of wires, adding an extra layer of efficiency to the network's operation. The design also includes a built-in collision detection mechanism, which helps manage data traffic effectively, thereby maintaining network integrity.

A defining technology of 3Com's implementation of 10BASE-T is its ability to support a star topology. Unlike previous bus topology systems that relied heavily on coaxial cables, the star topology allows for individual connections to a central hub or switch. This setup not only enhances fault tolerance—since a failure in one cable does not impact other network segments—but also simplifies network management and troubleshooting.

Additionally, 3Com's 10BASE-T technology supports auto-negotiation, allowing connected devices to automatically determine the best speed and duplex setting for communication. This adaptability makes it easier to integrate newer devices into existing networks and ensures smoother transitions as technology evolves.

In summary, 3Com 10BASE-T represents a significant advancement in networking technology, characterized by its use of twisted-pair cabling, efficient Manchester encoding, star topology, and auto-negotiation capabilities. Its contributions set the stage for the development of faster and more advanced Ethernet standards, cementing its place in the history of computer networking.