Black Box LH8000A-M Installation And User Manual
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Black Box LH8000A-M Installation And User Manual

Black Box LH8000A-M Installation And User Manual

10/100 dual-speed stackable hubs
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© Copyright 2002. Black Box Corporation. All rights reserved.
1000 PARK DRIVE • LAWRENCE, PA 15055-1018 • 724-746-5500 • FAX 724-746-0746
Dual-Speed Stackable Hub
BLACK BOX
Dual Speed Stackable Hub
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Installation and User Guid
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
January 2002
LH8000A-M,
LH8000A-C
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Summary of Contents for Black Box LH8000A-M

  • Page 1 FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 1000 PARK DRIVE • LAWRENCE, PA 15055-1018 • 724-746-5500 • FAX 724-746-0746 Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.com...
  • Page 2 Black Box Dual-Speed Stackable Hubs Installation and User Guide ® BLACK BOX 10/100 Dual-Speed Stackable Hubs Installation and User Guide Trademarks UL is a registered trademark of Underwriters Laboratories Ethernet is a trademark of Xerox Corporation Velcro is a trademark of Velcro U.S.A.
  • Page 3 Black Box Dual-Speed Stackable Hubs Installation and User Guide Contacting Black Box Corporation Please use the mailing address, phone and fax numbers listed below. Black Box Corporation 1000 Park Drive Lawrence, PA 15055 Phone (724) 746-5500 Fax (724) 746-0746 email: info@blackbox.com...
  • Page 4 Black Box Dual-Speed Stackable Hubs Installation and User Guide FEDERAL COMMUNICATIONS COMMISSION CANADIAN DEPARTMENT OF COMMUNICATIONS RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication.
  • Page 5 Black Box Dual-Speed Stackable Hubs Installation and User Guide Normas Oficiales Mexicanas (NOM) Electrical Safety Statement INSTRUCCIONES DE SEGURIDAD 1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado. 2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.
  • Page 6 Black Box Dual-Speed Stackable Hubs Installation and User Guide 12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada. 13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados sobre o contra ellos, poniendo particular atención a los contactos y receptáculos donde salen...
  • Page 7 Black Box Dual-Speed Stackable Hubs Installation and User Guide Certification Notice for Equipment Used in Canada The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets certain telecommunications-network protective, operation, and safety requirements. The Department does not guarantee the equipment will operate to the user’s...

  • Page 8: Table Of Contents

    Black Box Dual-Speed Stackable Hubs Installation and User Guide TABLE OF CONTENTS PAGE 1.0 SPECIFICATIONS ..................1 1.1 Technical Specifications ..................1 2.0 INTRODUCTION ..................3 2.1 Inspecting the Package and Product ..............3 2.2 Product Description .................... 4 2.2.1 Dual-Speed Hub Chassis ................. 6 2.2.2 10 / 100 Speed Auto-sensing ..............

  • Page 9: Specifications

    Black Box Dual-Speed Stackable Hubs Installation and User Guide SPECIFICATIONS Technical Specifications 100 or 10 Mbps per port, auto-sensing for speed. LH8000A hubs support two traffic domains, one at 100Mbps and one at 10Mbps, have eight RJ-45 ports, and are stackable up to 4 units high operating as one repeater.
  • Page 10 PWR : Steady ON when power applied : Bridge Module Indicator, ON when 10/100 bridge module is installed (Model LH8000A-M), OFF when no bridge module is inside (LH8000A-C) COL : Collision LEDs, one each for 100Mbps and 10Mbps speed domains...

  • Page 11: Introduction

    Remove the LH8000A Dual-Speed Hub from the shipping container. Be sure to keep the shipping container should you need to ship the unit at a later date. To validate the product warranty please complete and return the enclosed Product Registration Card to Black Box as soon as possible.

  • Page 12: Product Description

    10Mbps and the 100Mbps traffic domains. This enables all users on an LH8000A-M hub or an LH8000A stack, whether 100Mbps or 10Mbps , to talk to each other. The internal switch of the LH8000A-M filters and selectively forwards packets between the 10Mbps and the 100Mbps domains, maintaining peak performance in each domain unaffected by local traffic in the other domain.
  • Page 13 LH8000A-C “add-on” hubs . . . units that do not have the bridge module inside, and which cost less accordingly . . . can be added to the stack, up to the 4-unit stack maximum. In a stack, the LH8000A-M unit (illustrated below as the bottom unit) can be in any stack position. BLACK BOX...

  • Page 14: Dual-Speed Hub Chassis

    The LH8000A chassis houses one main PC board, a bridge module daughter- board in the Model LH8000A-M, and an internal power supply unit. The front side of the chassis has eight RJ-45 twisted-pair ports and one cascading (UP-LINK) switch for Port 8 on the right.

  • Page 15: Stacking Lh8000As

    Black Box Dual-Speed Stackable Hubs Installation and User Guide Stacking LH8000As Up to four LH8000As can be stacked to operate as one 10/100 dual-speed repeater with up to 32 dual-speed ports. Normally, one LH8000A-M hub per stack is needed to provide a switched interconnection between...

  • Page 16: Bridge Module Between The 10Mb And 100Mb Domains

    LED on the front labeled ‘BR’ that will be ‘ON’ when the module is installed internally. Power any LH8000A unit up and if the BR LED is ON, it is an LH8000A-M unit. NOTE : Only one LH8000A-M (with a bridge module built-in) is allowed per repeater stack.

  • Page 17: Applications

    Speed-sensing complies with IEEE 802.3u, providing interoperability with other products. An internal switch connects the 10 and 100Mb domains on Model LH8000A-M Model LH8000A-M has an internal switch for filtering / forwarding traffic between the 10 and 100Mbps domains, allowing all connected devices to talk to each other.
  • Page 18 LH8000A dual-speed port, and will automatically operate at the higher speed. The dual-speed ports on the LH8000A-M can be used for adding 100Mbps users or for accommodating existing high performance users. The 100Mb traffic does not use the...
  • Page 19 100Mbps ports are similarly together on a separate 100Mbps traffic domain. When one LH8000A-M unit with a bridge inside is present in a stack, its bridge will support all of the ports in the stack and enable network traffic to move between the two stacked domains.

  • Page 20: Installation

    Black Box Dual-Speed Stackable Hubs Installation and User Guide INSTALLATION This chapter provides instructions for installing the LH8000A hubs. Locating the Dual-Speed Hubs The location of an LH8000A Dual-Speed Hub is dependent on the physical layout of the network. Typically the hub is placed where combinations of 10Mbps and 100Mbps network devices need to be connected to communicate with each other.

  • Page 21: Connecting Ethernet Media

    Black Box Dual-Speed Stackable Hubs Installation and User Guide Connecting Ethernet Media The LH8000A Dual-Speed Stackable Hubs can be connected to the following two media types: 100BASE-TX and 10BASE-T. CAT 5 cables should be used when making 100BASE-TX connections. When the ports are used as 10BASE-T ports, CAT 3 may be used.
  • Page 22 Black Box Dual-Speed Stackable Hubs Installation and User Guide topology . . must be less than 512 BT (Bit Times). Bit Times are related to media type as shown in Table 3.2.2a. Table 3.2.2a: Worst case round-trip delay for Fast Ethernet media*...
  • Page 23 Black Box Dual-Speed Stackable Hubs Installation and User Guide Speed LH8000A Hubs(each having a PDV of 80BT) for use with standard 100m Category 5 user cable segments (i.e. from computer to hub) and needs to know how long the inter-repeater Category 5 cable segment, used to cascade the hubs, can be.
  • Page 24 Black Box Dual-Speed Stackable Hubs Installation and User Guide In the above example, 80 is the BT delay for 75m of Category 5 cable (1.112 BT/m), 80 is the bit time delay for each LH8000A front-to-front ports, 100 is the BT delay for the TX DTE pair in the user stations, and 2 BT is the safety margin applied.

  • Page 25: Connecting To Nics Which Support Auto-Negotiation

    Black Box Dual-Speed Stackable Hubs Installation and User Guide 3.2.3 Connections to NICs which support Auto-Negotiation The LH8000A Dual-Speed Hub will function properly with NICs (Network Interface Cards) which support Auto-Negotiation. The LH8000A will establish link with any NIC which can send and receive the Fast Link Pulse (FLP) coding for the 100BASE-TX signaling system.

  • Page 26: Operation

    Dual-Speed Functionality The LH8000A-C handles the two different traffic domains separately (unless it is stacked with an LH8000A-M). The LH8000A-M provides switched (bridged) connectivity between the Ethernet (10Mb/s) and Fast Ethernet (100Mb/s) domains. It joins the two network domains for unified operation, and filters/ forwards packets in both directions to maximize bandwidth utilization and performance.
  • Page 27 Table 4.1: LH8000A-M Dual-Speed Hub Functionality Address Learning (Address Table Maintenance) The LH8000A-M bridge module is a state machine design which has a total address table capacity of 8K addresses. With a large address table, LH8000As can serve the needs of a medium-sized to large network.

  • Page 28: Auto-Negotiation And Speed-Sensing

    Illuminates GREEN to indicate AC power is applied to the unit. BR : Bridge Module LED- ON when a bridge module is present in the unit (model LH8000A-M) OFF when no bridge module is present ( model LH8000A-C) COL : Two collision LED’s, one for each traffic domain, 10 and 100Mbps...

  • Page 29: Troubleshooting

    Technical Support for help. If you are unsure of any procedure described in this chapter, or if the Dual-Speed Hub is not operating as expected, do not attempt to repair or alter the unit. Contact Black Box for assistance. 5.1 Before Calling for Assistance If you have difficulty installing or operating the Dual-Speed Hub, refer to Chapters 3 and 4.

  • Page 30: When Calling For Assistance

    It contains no user-serviceable parts. Contact Black Box at (724) 746-5500. Before you do, make a record of the history of the problem. Black Box will be able to provide more efficient and accurate assistance if you have a complete description, including: •...

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