Lantronix MINI FAST LFH4-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 wall-

mounted, 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 transmit-

ting 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.

Not only does 100BASE-TX have a different data transmission scheme,

it also has different cabling requirements. As previously noted,

100BASE-TX requires data-grade (Category 5) UTP cable.

Some installations have Category 5 cabling but do not have wall outlets

and wiring closet punch-down blocks that meet Category 5 require-

ments. 100BASE-TX requires that all wiring and accessories meet

EIA/TIA 568B specifications for proper operation. When wiring a

100BASE-TX network, make sure that the entire cable plant meets

specifications.

Figure 2-1 LFH4-M 100BASE-TX Network Example

2.3 Installation

The LFH Mini Fast Ethernet Hubs are easy to install and require no

special training. You should, however, read the following instructions

carefully before proceeding to install your hub. Figures 2-2 and 2-3

show the layout of the front panels.

4321

4 321

PWR

COL

PARTITION

LINK/ACT

PORT NO.

Uplink 4321

4 321

PWR

COL

PARTITION

LINK/ACT

PORT NO.

Uplink

LFH4-M LFH4-M

Figure 2-2 LFH4-M Front Panel

Figure 2-3 LFH8-M Front Panel

The LFH Mini Fast Ethernet Hubs were designed for easy Òplug and

playÓ installation. Before you connect the LFH to other devices, there

are several issues you should keep in mind:

▼When connecting the LFH to a workstation using unshielded

twisted pair cable, you must make sure that the cable length is not

greater than 100 meters

▼When you connect two LFH hubs, you must make sure that the link

between them is not longer than 5 meters

▼Network cable segments can be connected to, or disconnected from

the hub while the power is on. Plugging in or removing network

cables while your hub is operating will not interrupt the operation

of the hub

▼When placing your LFH hub, you need to avoid dusty locations and

electromagnetically noisy areas

4321

4 321

PWR

COL

PARTITION

LINK/ACT

PORT NO.

LFH4-M

Uplink

4321

4 321

PWR

COL

PARTITION

LINK/ACT

PORT NO.

LFH4-M

Uplink

2.4 Mounting

Your LFH4-M or LFH8-M hub is delivered with a mounting bracket.

The LFH hub can be mounted to the wall or to the surface of a counter-

top by using the bracket and hanging the LFH hub on the wall using

the keyholes provided on the bottom of the hub.

If mounting the LFH hub is not your preference, you may choose to

place the LFH hub on a table or wiring closet shelf. Use the four self-

adhesive rubber feet, which are provided with the hub for cushioning

purposes. Place them on the four corners of the bottom surface of the

hub.

2.5 Connecting the LFH Hub

Use the following procedures to connect 100BASE-TX network devices

to the hub:

NOTE: If the Uplink Port is being utilized on the LFH hub, the adja-

cent Port may not be used. Conversely, if that Port is being utilized, the

Uplink Port may not be connected.

The following table describes the two cable types:

Make sure that the length of the straight-through cable between the

LFH hub and the other device does not exceed 100 meters, including all

patch cables and cross-connect wires.

Make sure that the length of the straight-through cable between two

hubs does not exceed 5 meters.

LFH4-M Ports 1-4 Uplink Port

LFH8-M Ports 1-8

PC, Workstation S C

Server S C

Hub, Switch port C S

Hub, Switch uplink port S C

S = Straight Cable C = Crossover cable

Straight cable Crossover cable

Pin 1 TD+ RD+

Pin 2 TD- RD-

Pin 3 RD+ TD+

Pin 6 RD- TD-

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