Lantronix LFH8-S User manual

LFH8-S/LFH16-S

Fast Stackable 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

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

2.5 Stacking LFH8-S/LFH16-S Hubs . . . . . . . . . . . . . . . . . . . . . 9

2.6 Connecting the LFH Hub . . . . . . . . . . . . . . . . . . . . . . . . . . 11

CHAPTER 3. LED Indicators

3.1 Power LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.2 Partition LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.3 Link/Receive LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.4 Utilization % LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.5 System Status LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Limited Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . 16

CHAPTER 1 Introduction

1.1 Product Introduction

Congratulations on your purchase of the LFH stackable 8-port or 16-

port Fast Ethernet Hub! The LFH8-S and LFH16-S are designed to give

you the ultimate in flexibility, ease-of-use, and reliability.

The LFH8-S and LFH16-S Stackable Fast Ethernet Hubs are 100BASE-

TX multiport Class II repeaters designed 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 feature

Link/Receive, Partition, and Utilization % LEDs for convenient moni-

toring of the status of the hub and of each port. The rear panel of each

LFH hub features two stacking ports, allowing up to six LFH stackable

hubs to be combined as a single repeater. For additional expansion, the

LFH8-S/ LFH16-S provides an uplink port that makes it easy to cascade

the hub to another Fast Ethernet hub or hub stack.

The LFH8-S/LFH16-S hubs can be placed on a table top or rack-

mounted, and provide the ideal solution for small to large 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 LFH8-S and LFH16-S 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 LFH8-S provides eight 100BASE-TX ports and the LFH16-S

provides 16 100BASE-TX ports for Fast Ethernet connectivity

▼The LFH8-S/LFH16-S 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 LFH8-S/LFH16-S to

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

cable

▼The LFH8-S and LFH16-S stackable architectures enable up to 6

hubs to be stacked together for a total of up to 96 ports

▼Performs preamble regeneration, signal retiming and restoration,

extension of fragmented packets, automatic partitioning, and jabber

truncation

▼Global Power and individual port Link/Receive, Partition, and

Utilization% LEDs indicate system status

▼The internal power supply automatically adjusts to the voltage

range of the AC power being supplied (100VAC/60Hz to

240VAC/50Hz), with no change in settings or fuse required

▼The LFH8-S and LFH16-S come with metal brackets that can be

easily attached to the hub for mounting in a standard 19 inch equip-

ment rack

▼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 100Mbps ports, one crossover ÒUplinkÓ

port

Two 25-pin stacking connectors

Stackable Maximum 6-hub stack, stacking cable included

LED indicators Power, Partition, Link/Receive and Utilization indi-

cators

Dimensions 356mm x 230mm x 44mm (L x W x H)

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

Storage: -20¡C to 70¡C

Humidity Operating: 10% to 90% RH

Power 100 VAC/60Hz to 240 VAC/50Hz

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

Warranty 5-year limited

Chapter 2 Installing the LFH Hub

2.1 Packing Checklist

Your LFH package should contain the following:

✓An LFH8-S or LFH16-S Fast Stackable Hub

✓One AC Power Cable

✓One 25-pin cable for stacking LFH hubs

✓Mounting brackets and screws

✓Four self-adhesive standoffs

✓Rackmount brackets and screws

✓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 noted above, 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.

2.3 Installation

The LFH Stackable Fast Ethernet Hubs are easy to install and require

no special training. You should, however, read the following instruc-

tions carefully before proceeding to install your hub. Figures 2-1 and

2-2 show the layout of the front panels.

Figure 2-1 LFH8-S Front Panel

Figure 2-2 LFH16-S Front Panel

12345678

PWR

UTILIZATION %

PARTITION

LINK/RECEIVE

PORT NO.

LFH8-S

10 60+

1234 5678 Uplink

910111213141516

1234 5678

12345678

PWR

LINK/RECEIVE

PORT NO.

LFH16-S

10 60+

9101112 13141516

Uplink

PORT NO.

PARTITION

LINK/RECEIVE

UTILIZATION %

PARTITION

The LFH Stackable 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 Fast Ethernet hubs or hub stacks

together, you must make sure that the link between them is no longer

than 5 meters

▼Network cable segments can be connected to or disconnected from

the LFH 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

2.4 Mounting

Your LFH8-S or LFH16-S hub is delivered with two brackets for

mounting the hub in an EIA standard 19 inch rack. Secure the

mounting brackets onto the sides of the hub, fastening them with

screws as shown in Figure 2-3.

Figure 2-3 Mounting Bracket Installation

8 7 65 43 21

UTILIZATION %

PARTITION

LINK/RECEIVE UPLINK

10 60+

If your site uses only a few hubs and is not equipped with a mounting

rack, you may choose to place the LFH hub on a table or wiring closet

shelf. In this case, use the four self-adhesive rubber feet, which are

provided with the hub for cushioning purposes. Stick them at the four

corners of the bottom surface of the hub to cushion it against vibration.

2.5 Stacking LFH8-S/LFH16-S Hubs

You can stack up to six LFH8-S/LFH16-S hubs together using the

special connectors on the back panel. A single stack can contain a

mixture of 8-port and 16-port hubs. The maximum allowable any of

LFH8-S and LFH16-S hubs in a stack are 6 hubs.

When the LFH hubs are stacked together they are counted as a single

Fast Ethernet repeater, and the entire stack can be chained as a unit to

another Class II hub or hub stack.

To stack two LFH8-S/LFH16-S hubs together (see Figure 2-4):

1. Position the LFH hubs with one on top of the other.

2. Connect one end of the stacking cable to either one of the connectors

on the rear of the LFH hub. Make sure the cable snaps firmly onto

the connector.

3. Connect the other end of the stacking cable to either one of the

connectors on the other LFH hub.

Figure 2-4 Stacking Two Hubs

100-240 VAC 1A 50-60 Hz

AC IN

OUT

100-240 VAC 1A 50-60 Hz

AC IN

OUT

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