Lantronix LFH4-M, LFH8-M User Manual

LFH4-M/LFH8-M

Mini Fast Hubs

Installation Guide

Table of Contents

CHAPTER 1. Introduction

1.1 Product Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3 Product Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

CHAPTER 2. Using the LFH Hub

2.1 Packing Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Planning 100BASE-TX Networks . . . . . . . . . . . . . . . . . . . . . 5

2.3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.4 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.5 Connecting LFH Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

CHAPTER 3. LED Indicators

3.1 Power LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2 Collision LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.3 Link/Activity LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.4 Partition LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.5 System Status LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Limited Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . 15

CHAPTER 1 Introduction

1.1 Product Introduction

Congratulations on your purchase of the LFH 4-port or 8-port Mini Fast Ethernet Hub! The LFH4-M and LFH8-M are designed to give you the ultimate in flexibility, ease-of-use, and reliability.

The LFH4-M and LFH8-M Mini Fast Ethernet Hubs are 100BASE-TX multiport Class II repeaters for use with networks using Unshielded Twisted Pair (UTP) category 5 cable or Shielded Twisted Pair (STP) cable. The LFH hubs are simple to install, and Link/Activity, Partition, and Collision LEDs provide convenient monitoring of the status of the hub and of each port. For additional expansion, the hub offers an Uplink port that makes it easy to cascade the hub to another Fast Ethernet hub.

The LFH4-M/LFR8-M hubs can be placed on a tabletop or wallmounted, and provide the ideal solution for small to medium 100BASE-TX Fast Ethernet networks. The LFH hubs are designed to comply with the IEEE 802.3u Fast Ethernet standard.

To insure network reliability, the LFH4-M and LFH8-M monitor each port for signal quality and automatically disconnect stations transmitting noise, reconnecting them when the problem is resolved. Data packets that exceed the maximum legal length for IEEE802.3 Ethernet packets are automatically truncated. This prevents a device from blocking the network by transmitting a continuous data stream or excessively long packet. The LFH hubs completely retime and restore full-amplitude waveforms for each retransmitted packet. A full-length preamble is also generated, insuring packet integrity across the network.

1.2 Features

▼ The LFH4-M provides four 100BASE-TX ports and the LFH8-M

provides eight 100BASE-TX ports for Fast Ethernet connectivity

▼ The LFH4-M/LFH8-M comply with the IEEE 802.3u Fast Ethernet

standard

▼ Supports Category 5 Unshielded Twisted Pair (UTP) or Shielded

Twisted Pair (STP) cable

▼ An Uplink port on the front panel enables the LFH4-M/LFH8-M to

be connected to another 100BASE-TX hub using a straight-through cable

▼ Performs preamble regeneration, signal retiming and restoration,

extension of fragmented packets, automatic partitioning, and jabber

truncation

▼ Global Power and Collision LEDs and individual Partition and

Link/Activity LEDs indicate system status

▼ Comes with external AC/DC power supply (120VAC or 220VAC) ▼ FCC Class A, CE, UL, CUL, TUV certifications ▼ Five year limited warranty

1.3 Product Specifications

Standards IEEE 803.3u 100BASE-TX Ethernet

Network Media 100BASE-TX Unshielded Twisted Pair cabling

(Category 5 UTP)

Max. Lengths 100 meter hub-to-station connection

5 meter hub-to-hub connection

Connectors 8/16 RJ45 connectors, one crossover ÒUplinkÓ port

LED indicators Power, Collision, Partition, Link/Activity

Dimensions 221mm x 111mm x 26mm (L x W x H)

Environment Temperature: Operating: 0¡C to 40¡C

Storage: -20¡C to 70¡C

Humidity Operating: 10 to 80%RH

Storage: 5 to 90%RH

Certifications FCC Class A, CE, UL, CUL, TUV

Warranty 5-year limited

Chapter 2 Using the LFH Hub

2.1 Packing Checklist

Your LFH package should contain the following:

✓ An LFH4-M or LFH8-M Mini Fast Hub ✓ Mounting brackets and screws ✓ External AC/DC power adapter (120VAC or 220VAC) ✓ Installation Guide

If any of these items are missing, contact your dealer immediately.

2.2 Planning 100BASE-TX Networks

100BASE-TX networks need to be planned out slightly differently from 10BASE-T networks, because new hubs and new wiring configurations are necessary. (10BASE-T hubs are incapable of sending or receiving data at 100Mbps, so a 100BASE-TX network requires a 100BASE-TX hub.)

100BASE-TX supports a maximum length of 100 meters from a network station to a hub. The total network diameter (the maximum cable distance between any two stations on the network) is 205 meters for 100BASE-TX, as opposed to 500 meters for 10Mbps Ethernet. Because 100BASE-TX sends signals ten times faster than 10BASE-T, the collision window (the time during which the network can detect a collision between packets) is reduced to one-tenth the duration of the 10BASE-T collision window, making the maximum network diameter smaller.

In a repeater environment, 100BASE-TX only allows a single layer of cascaded hubs.

Switching hubs, such as LantronixÕs LSW8FA, may increase the network diameter for 100BASE-TX networks by buffering data packets. Each port can be connected to a separate LAN segment, each with a maximum diameter of 205 meters, thereby increasing the overall 100BASE-TX network diameter.

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