Lantronix LTR8T, LTR16T Installation Manual
LTR-T Installation Guide
Thank you for choosing the Lantronix LTR-T repeater.
Like all Lantronix products, the LTR-T is designed and built to exacting standards. We
strive to make all of our products easy to use and of the highest quality. That’s how we’re
able to support them with a five-year warranty and free technical support.
I hope you find this manual easy to use and thorough in its explanation of the LTR-T
installation process.
Brad Freeburg
President
The information in this guide is subject to change without notice. The manufacturer
assumes no responsibility for any errors which may appear in this guide.
DELNI, Thinwire, and Thickwire are trademarks of Digital Equipment Corporation.
Copyright © 1993, Lantronix.
All rights reserved. No part of the contents of this guide may be transmitted or
reproduced in any form or by any means without the written permission of Lantronix.
Printed in the United States of America.
The revision date for this manual is 6 May 1996
Part Number: 900-006
Rev. A
WARNING
This equipment has been tested and found to comply with the limits for a Class A digital
device pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when operating in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy,
and if not installed and used in accordance with this guide, may cause harmful
interference to radio communications.
Operation of this equipment in a residential area is likely to cause interference in which
case the user, at his or her own expense, will be required to take whatever measures may
be required to correct the interference.
Caution: changes or modifications to this device not explicitly approved by Lantronix
will void the user’s authority to operate this device.
Cet appareil doit se soumettre avec la section 15 des statuts et règlements de FCC. Le
fonctionnement est subjecté aux conditions suivantes:
(1) Cet appareil ne doit pas causer une interférence malfaisante.
(2) Cet appareil doît accepter n’importé quelle interférence reçue qui peut causer
une opération indésirable.
Table Of Contents
Overview .................................................................................................... 1
Guide to this Manual ............................................................................................ 1
Site Preparation and Unpacking ............................................................. 2
Space Requirements ............................................................................................. 2
Environmental Considerations ............................................................................. 2
Installation of Other Hardware Components........................................................ 4
Checking the Cable Connections.......................................................................... 4
Unpacking the Unit............................................................................................... 4
Installation ................................................................................................. 5
Network Configuration......................................................................................... 5
Cabling Instructions.............................................................................................. 7
Adding New Network Segments.......................................................................... 9
Power-up Sequence................................................................................. 10
Troubleshooting.................................................................................................. 12
Normal Operation ............................................................................................... 13
Configuration .......................................................................................... 14
Configuration Mode ........................................................................................... 15
Storing Configuration ......................................................................................... 17
Factory Defaults ................................................................................................. 17
10BASE-T Wiring Conventions......................................................................... 18
Hub Interconnection ........................................................................................... 19
Maintenance Information ................................................................................... 19
Glossary.................................................................................................... 20
Appendix A - Power Supply Cord......................................................... 23
Appendix B - Cabling ............................................................................. 25
Lantronix Problem Report Procedure................................................................. 27
Warranty.................................................................................................. 29
Figures and Tables
Figures:
Figure 1: LTR-T dimensions .......................................................................... 2
Figure 2a: A Simple Network Configuration ................................................... 6
Figure 2b: A Complex Network Configuration................................................ 6
Figure 3: LTR-T front and back panels .......................................................... 7
Figure 4: Connecting the transceiver cable to the AUI port........................... 8
Figure 5: Hub Interconnect Configuration.................................................... 19
Tables:
Table 1: LTR-T Power Requirements........................................................... 3
Table 2: Parts List.......................................................................................... 4
Table 3: Power-up Diagnostic codes........................................................... 11
Table 4: Port Status LEDs........................................................................... 13
Overview
The LTR8T and LTR16T are 10BASE-T hub/repeaters that receive Ethernet traffic from
one cable segment and repeat that data to all of the other attached segments. The units
provide 8 (LTR8T) or 16 (LTR16T) RJ-45 connection to 10BASE-T media. The
10BASE-T media is phone-grade (or better) unshielded twisted pair cable, also called
UTP. The hubs also provide one (LTR8T) or two (LTR16T) standard 15-pin AUI
connectors for interfacing to Thickwire media or other media via an external transceiver.
Each 10BASE-T segment can be connected to either a network node or to another
10BASE-T hub for further network distribution.
In the discussions below, the term LTR-T will be used to refer to both the LTR8T and the
LTR16T, which are considered functionally equivalent.
LTR-T Features
The LTR-T has the following features:
• meets IEEE 802.3 repeater specifications.
• 8 or 16 (LTR16T) 10BASE-T ports for direct connection to UTP cable segments
of up to 100 meters each.
• 1 or 2 (LTR16T) AUI ports for attachment of external Thinwire (10BASE2),
Thickwire (10BASE5), or UTP (10BASE-T) transceivers.
• separate status and activity LEDs for each port.
• user-friendly interface allows configuration of link test and polarity correction
and manual partitioning of individual ports.
• automatic port partitioning disables malfunctioning network segments and records
the event to aid in network troubleshooting.
• optional stringent reconnection algorithm for reinstatement of automatically
partitioned ports.
• 1 or 2 (LTR16T) user configurable ports simplify repeater to repeater
connections.
• small physical size.
• easy installation.
Guide to this Manual
The rest of this manual covers unpacking and installation instructions, diagnostics, and
configuration of the LTR-T. Appendix A lists the power supply cord specifications for
use outside the U.S. and Canada. Appendix B explains different kinds of cables you can
use and rules you must follow to set up your network. A glossary is also provided to
explain any unfamiliar terms.
LTR-T Installation Guide 1
Site Preparation and Unpacking
Before installing the LTR-T, do the following to prepare your site:
• Check space requirements
• Confirm that the LTR-T will have the proper environmental conditions
• Check the installation of other hardware components
• Check the cable connections
• Unpack the unit, making sure all of the parts are enclosed
Each item in this list is explained in detail in this section.
Space Requirements
The table below shows the dimensions of the LTR-T. Allow two inches of space on each
side of the unit for ventilation.
LTR-8T LTR-16T
Width 8.5” 8.5”
Depth 5.5” 5.5”
Height 2.8” 3.8”
Figure 1: LTR-T Dimensions
Environmental Considerations
The following paragraphs list the power and temperature requirements, altitude
limitations, and relative humidity limitations of the LTR-T. Check these values to
guarantee that the LTR-T can operate in the chosen location.
Power Requirements
Table 1 lists the power requirements for the LTR-T. Note that the unit can operate using
either 110 Vac or 220 Vac outlets. There are no switches or jumpers to change for
international (220 Vac) use. Refer to Appendix A for power supply cord specifications
for use outside the U.S. and Canada.
2 LTR-T Installation Guide
Voltage 95-250 Vac 3-wire single phase, autoranging
Frequency 47 to 63 Hz
Operating current 0.5 Amp (maximum)
Power 30 Watts
Fuse (field replaceable) 2 Amp 250 Vac, time delay
Table 1: LTR-T Power Requirements
Fuse
Under normal use, the fuse should not need to be replaced. If it does, ensure that the
proper type of fuse is used. Never replace the fuse with the unit plugged in.
*** CAUTION: For continued protection against the risk of fire, replace only with the
same type and rating of fuse: T2A/250V.
*** AVIS: Pour la protection continuante contre le risque d’incendie remplacer
seulement par le même type et le cote de fusible: T2A/250V.
*** VORSICHT: Zum Schutz gegen das Risiko eines Brandes darf die Sicherung nur mit
einer mit gleichen technischen Daten ersetzt werden: T2A / 250V.
Temperature Limitations
• Operating: 5° to 50°C (41° to 122°F)
• Nonoperating: -40° to 66°C (-40° to 151°F)
Rapid temperature changes may affect operation. Therefore, do not operate the LTR-T
near heating or cooling devices, large windows, or doors that open to the outside.
Maximum temperature change per hour is 20°C (36°F).
Altitude Limitations
• Operating: 2.4 km (8,000 ft.)
• Nonoperating: 9.1 km (30,000 ft.)
If you are operating the LTR-T above 2.4 km (8,000 ft.), decrease the operating
temperature by 1.8°C for each additional 1,000 m (1°F for each 1,000 ft.).
Relative Humidity Limitations
• Operating: 10% to 90% noncondensing (40% to 60% recommended)
• Nonoperating: 10% to 90% noncondensing
LTR-T Installation Guide 3
Installation of Other Hardware Components
Ensure that the 10BASE-T (UTP) cables you will be using have been tested and labeled.
See the cable pinouts in Appendix C, if necessary.
If you will be connecting the LTR-T to a Thinwire segment, you will need an LTX-2 or
equivalent 10BASE2 transceiver to attach the segment to the LTR-T’s AUI port.
If connecting to a Thickwire segment, an LTX-5 or equivalent 10BASE5 transceiver will
be required as well as an AUI cable of the necessary length.
If you will be connecting the LTR-T to a Local Network Interconnect (DELNI or
equivalent) you will need an AUI cable between the DELNI and the LTR-T’s AUI port.
Checking the Cable Connections
Make sure you have enough cable to connect the LTR-T to your network. There are three
types of cable connections you must consider:
• 10BASE-T (UTP) segments: one or more, each up to 100 meters long.
• Power: outlet should be within 1.8 m (6 ft) of the LTR-T.
• AUI cable: up to 50 meters if going directly to a transceiver, or 45 meters total if
using a Local Network Interconnect (LNI) device. Consult your LNI manual to
verify the latter value.
Unpacking the Unit
As you unpack the LTR-T, make sure the parts listed in Table 2 are enclosed. If you have
not received a complete LTR-T unit, contact your dealer immediately.
Description of part Quantity
Multiport Repeater (LTR-T) 1
U. S. power cord 1
This manual 1
Table 2: Parts List
4 LTR-T Installation Guide
Installation
Network Configuration
Figure 2 shows two sample network configurations using the LTR-T. Figure 2a shows a
simple network configuration using only 10BASE-T segments; Figure 2b shows a more
complex configuration using Thickwire Ethernet and interconnected LTR-T units. In
Figure 2b, the LTR-T on the left is directly connected from the AUI to the transceiver,
while the LTR-T on the right is connected from the AUI to a Local Network Interconnect
device.
You can connect one or more 10BASE-T segments to the LTR-T, one to each port on the
back of the unit. Additionally, you can connect multiple LTR-T units together, making
sure that there are no more than four LTR-T units between any two nodes. See the
Interconnection section below for important notes about interconnecting LTR-Ts. You
can also attach a transceiver to the AUI port to attach to 10BASE-T or Thinwire media.
If you need more information about rules you must follow when setting up your network,
refer to Appendix B.
LTR-T Installation Guide 5
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