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
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CHAPTER 1 Introduction
1.1 Product Introduction
Congratulations on your purchase of the LFH stackable 8-port or 16port 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 100BASETX 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 monitoring 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 rackmounted, 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 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.
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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 equipment rack
▼ FCC Class A, CE, UL, CUL, TUV certifications
▼ Five year limited warranty
3
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
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5
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.
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