Allied Telesis CentreCOM AT-MR415T User manual

CentreCOM
AT-MR415T
AT-MR815T
Multiport 10Base-T Micro Repeaters
Installation Guide
PN 613-10685-00 Rev A
®

Copyright  1997 Allied Telesyn International Corp.
All rights reserved. No part of this publication may be reproduced without prior written
permission from Allied Telesyn International Corp.
Allied Telesyn International Corp. reserves the right to make changes in specifications and
other information contained in this document without prior written notice. The information
provided herein is subject to change without notice. In no event shall Allied Telesyn
International Corp. be liable for any incidental, special, indirect, or consequential damages
whatsoever, including but not limited to lost profits, arising out of or related to this manual
or the information contained herein, even if Allied Telesyn International Corp. has been
advised of, known, or should have known, the possibility of such damages.
Trademarks: Ethernet is a registered trademark of Xerox Corporation. UNIX is a
registered trademark in the United States and other countries licensed exclusively through
X/Open Company Limited. Novell and NetWare are registered trademarks of Novell, Inc.
Microsoft and MS-DOS are registered trademarks and LAN Manager and Windows for
Workgroups are trademarks of Microsoft Corporation. 3Com is a registered trademark of
3Com.PC-NFSisatrademark of SunMicrosystems, Inc. PC/TCPis a registeredtrademark
of FTP Software, Inc. DECnet is a registered trademark of Digital Equipment Corporation.
All company names, logos, and product designations that are trademarks or registered
trademarks are the property of their owners.

iii
Electrical Safety and Installation
Requirements
U.S. Federal Communications Commission
DECLARATION OF CONFORMITY
Manufacturers Name: Allied Telesyn International
Manufacturers Address: 950 Kifer Road
Sunnyvale, CA 94086 USA
Manufacturers Telephone: [phone]
Declares that the product: Multiport Ethernet Hub unit
Model Numbers: AT-MR415T and AT-MR815T
Complies with FCC Part 15B, Class B Limits:
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) This device must not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired operation.
RADIATED ENERGY
Note: This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment, generates,
uses and can radiate radio frequency energy and, if not installed and used in accordance with
instructions, may cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encourage to try to correct the
interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and the receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
- Consult the dealer or an experienced radio/TV technician for help.
Changes and modifications not expressly approved by the manufacturer or registrant of this
equipment can void your authority to operate this equipment under Federal Communications
Commission rules.
Canadian Department of Communications
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.

Electrical Safety and Installation Requirements
iv
STANDARDS : This product meets the following standards
RFI Emission EN55022 Class B
Immunity EN50082-1
SAFETY
Power to the hub must be sourced only from the adapter.
AUSTRALIA
Use a safety approved AC adapter of DC 7.5V to 12V, min 500mA
EUROPE - EC
Use TÜV licensed AC adapter of DC 7.5V, 500mA.
USA/CANADA
Use a UL Listed/CSA Certified AC adapter of DC 7.5V, 500mA.
LIGHTNING DANGER
DANGER : DO NOT WORK on equipment or CABLES during periods of LIGHTNING ACTIVITY.
Do not connect a telephone line into the signal connector.
OPERATING TEMPERATURE
This product is designed for a maximum ambient temperature of 40 degrees C.
ALL COUNTRIES : Install product in accordance with local and National Electrical Codes.
NORMEN : Dieses Produkt erfüllt die Anforderungen der nachfolgenden Normen.
Hochfrequenzstörung EN55022 Klasse B
Störsicherheit EN50082-1
SICHERHEIT
Der Buchse darf nur aus dem Adapter Strom zugeführt werden.
EUROPE - EC
Gebrauchen Sie einen von TÜV zugelassenen Wechselstromadapter für Gleichstrom 7,5 V, 500 mA
GEFAHR DURCH BLITZSCHLAG
GEFAHR : Keine Arbeiten am Gerät oder an den Kabeln während eines Gewitters ausführen
Verbinden Sie nicht das Telefonkabel mit dem Signalverbindungsstecker.
BETRIEBSTEMPERATUR
Dieses Produkt wurde für den Betrieb in einer Umgebungstemperatur von nicht mehr als 40 ° C
entworfen.
ALLE LÄNDER : Installation muß örtlichen und nationalen elektrischen Vorschriften entsprechen.

AT-MR415T and AT-MR815T Installation Guide
v
Radiofrekvens forstyrrelsesemission EN55022 Klasse B
Immunitet EN50082-1
SIKKERHED
Strømforsyningen til apparatet må udelukkende tages fra tilpasningstransformatoren.
EUROPE - EC
Brug kun TÜV godkendt vekselstrømstransformator på 7.5 V jævnstrøm, 500 mA.
FARE UNDER UVEJR
FARE : UNDLAD at arbejde på udstyr eller KABLER i perioder med LYNAKTIVITET.
Tilslut ikke telefonledninger til signalstikforbindelsen.
BETJENINGSTEMPERATUR
Dette apparat er konstrueret til en omgivende temperatur på maksimum 40 grader C.
ALLE LANDE : Installation af produktet skal ske i overensstemmelse med lokal og national
lovgivning for elektriske installationer.
RFI Emissie EN55022 Klasse B
Immuniteit EN50082-1
VEILIGHEID
Stroom mag alleen via de adapter naar het apparaat toegevoerd worden.
EUROPE - EC
Gebruik een door TÜV gekeurde wisselstroomadapter van 7,5 Volt gelijkstroom, 500 milliampères
GEVAAR VOOR BLIKSEMINSLAG
GEVAAR : NIET aan toestellen of KABELS WERKEN bij BLIKSEM.
Sluit geen telefoonlijn aan op de signaalverbinding.
BEDRIJFSTEMPERATUUR
De omgevingstemperatuur voor dit produkt mag niet meer bedragen dan 40 graden Celsius.
ALLE LANDEN : het toestel installeren overeenkomstig de lokale en nationale elektrische
voorschriften.
NORMES : ce produit est conforme aux normes de suivantes:
Emission d’interférences radioélectriques EN55022 Classe B
Immunité EN50082 - 1
SÉCURITÉ
L’alimentation du concentrateur doit être uniquement fournie par l’adaptateur.
EUROPE - EC
Utiliser un adaptateur secteur conforme TÜV de 7,5 V, 500 mA en courant continu.
DANGER DE FOUDRE
DANGER : NE PAS MANIER le matériel ou les CÂBLES lors d’activité orageuse.
Ne pas connecter une ligne téléphonique au connecteur de signaux.
TEMPÉRATURE DE FONCTIONNEMENT
Ce matériel est capable de tolérer une température ambiante maximum de 40 degrés Celsius.
POUR TOUS PAYS : Installer le matériel conformément aux normes électriques nationales et
locales.

Electrical Safety and Installation Requirements
vi
Radioaaltojen häirintä EN55022 Luokka B
Kestävyys EN50082-1
TURVALLISUUS
Tähtipisteeseen (hub) syötettävän virran pitää tulla ainoastaan sovittimesta.
EUROPE - EC
KäytäTÜV-lisenssillä valmistettuaverkkosovitinta, jonkatasajännitteennimellisarvotovat DC7,5V,
500 mA (milliampeeria).
SALAMANISKUVAARA
HENGENVAARA : ÄLÄ TYÖSKENTELE laitteiden tai KAAPELEIDEN KANSSA SALAMOINNIN
AIKANA.
Älä liitä puhelinlinjaa signaalin liittimeen.
KÄYTTÖLÄMPÖTILA
Tämä tuote on suunniteltu ympäröivän ilman maksimilämpötilalle 40 ° C.
KAIKKI MAAT: Asenna tuote paikallisten ja kansallisten sähköturvallisuusmääräysten mukaisesti.
Emissione RFI (interferenza di radiofrequenza) EN55022 Classe B
Immunità EN50082-1
NORME DI SICUREZZA
Questo dispositivo deve essere alimentato solo mediante l’adattatore.
EUROPE - EC
Utilizzare l’adattatore per c.a. da 7,5 V c.c. e 500 mA conforme alla normativa TÜV.
PERICOLO DI FULMINI
PERICOLO : NON LAVORARE sul dispositivo o sui CAVI durante PRECIPITAZIONI
TEMPORALESCHE.
Non collegare una linea telefonica al connettore del segnale.
TEMPERATURA DI FUNZIONAMENTO
Questo prodotto è concepito per una temperatura ambientale massima di 40 gradi centigradi.
TUTTI I PAESI : installare il prodotto in conformità delle vigenti normative elettriche nazionali.
RFI stråling EN55022 Klasse B
Immunitet EN50082-1
SIKKERHET
All strømtilførsel må komme fra adapteren.
EUROPE - EC
Benytt TÜV-godkjent AC-adapter på 7,5V DC, 500mA (milliampere).
FARE FOR LYNNEDSLAG
FARE : ARBEID IKKE på utstyr eller KABLER i TORDENVÆR.
Telefonlinje må ikke koples til signalkontakten.
DRIFTSTEMPERATUR
Dette produktet er konstruert for bruk i maksimum romtemperatur på 40 grader celsius.
ALLE LAND : Produktet må installeres i samsvar med de lokale og nasjonale elektriske koder.

AT-MR415T and AT-MR815T Installation Guide
vii
Emissão de interferência de radiofrequência EN55022 Classe B
Imunidade EN50082-1
SEGURANÇA
Use somente o adaptador fornecido para alimentação elétrica do hub.
EUROPE - EC
Use um adaptador de corrente alternada com saída DC de 7,5V e 500mA em conformidade com as
especificações da TÜV.
PERIGO DE CHOQUE CAUSADO POR RAIO
PERIGO : NÃO TRABALHE no equipamento ou nos CABOS durante períodos suscetíveis a QUEDAS
DE RAIO.
Não conecte uma linha telefônica ao conector de sinal.
TEMPERATURA DE FUNCIONAMENTO
Este produto foi projetado para uma temperatura ambiente máxima de 40 graus centígrados.
TODOS OS PAÍSES : Instale o produto de acordo com as normas nacionais e locais para
instalações elétricas.
Emisión RFI EN55022 Clase B
Inmunidad EN50082-1
SEGURIDAD
La energía para el dispositivo central o “hub” debe provenir únicamente del adaptador.
EUROPE - EC
Utilizar un adaptador de corriente alterna autorizado TÜV de 7,5 voltios de corriente continua y 500
miliamperios.
PELIGRO DE RAYOS
PELIGRO : NO REALICE NINGUN TIPO DE TRABAJO O CONEXION en los equipos o en LOS
CABLES durante TORMENTAS ELECTRICAS.
No conectar ninguna línea telefónica al conector de señales.
TEMPERATURA REQUERIDA PARA LA OPERACIÓN
Este producto está diseñado para una temperatura ambiental máxima de 40 grados C.
PARA TODOS LOS PAÍSES : Monte el producto de acuerdo con los Códigos Eléctricos locales y
nacionales.
Radiostörning EN55022 Klass B
Immunitet EN50082-1
SÄKERHET
Endast anslutningsenheten får vara kraftkälla till centralen.
EUROPE - EC
Använd en växelströmsanslutningsenhet licensierad av TÜV. Likström 7,5V, 500mA.
FARA FÖR BLIXTNEDSLAG
FARA : ARBETA EJ på utrustningen eller kablarna vid ÅSKVÄDER.
Koppla inte telefonledning till signalkontakten.
DRIFTSTEMPERATUR
Denna produkt är konstruerad för rumstemperatur ej överstigande 40 grader Celsius.
ALLA LÄNDER : Installera produkten i enlighet med lokala och statliga bestämmelser för elektrisk
utrustning.

ix
Table of Contents
Electrical Safety and Installation Requirements ..................................iii
Chapter 1
Product Description .......................................................................................1
Overview..............................................................................................................1
Features...............................................................................................................1
Package Contents................................................................................................2
Latest Technologies.............................................................................................2
ASIC/SMT.....................................................................................................2
Packet Regeneration....................................................................................2
Link Integrity...............................................................................................2
Auto Partitioning .........................................................................................2
Jabber Lock-up Protection...........................................................................3
AT-MR415T .........................................................................................................3
Light Emitting Diodes (LEDs).....................................................................3
AT-MR815T .........................................................................................................5
Light Emitting Diodes (LEDs).....................................................................5
Chapter 2
Installation .......................................................................................................9
Site Requirements...............................................................................................9
Ventilation....................................................................................................9
Power ............................................................................................................9
UTP (RJ-45) Connectivity.................................................................................10
10Base-T Cable...........................................................................................11
Quick Installation..............................................................................................12
10Base-T Network Specifications..............................................................13
System Check ....................................................................................................13
Standalone Placement of the MR415T/MR815T .............................................14
Connecting to a Network...................................................................................14
Examples of Network Connections............................................................16

Table of Contents
x
Chapter 3
Troubleshooting ........................................................................................... 19
Performing a Connection Test ......................................................................... 19
Troubleshooting................................................................................................ 20
Is The Unit Receiving Power?................................................................... 20
Is The Link On Lamp Lighted? ................................................................ 21
Appendix A
Technical Specifications ............................................................................ 23
AT-MR415T....................................................................................................... 23
Physical...................................................................................................... 23
Connector Ports......................................................................................... 23
AT-MR815T....................................................................................................... 23
Physical...................................................................................................... 23
Connector Ports......................................................................................... 23
AT-MR415T/AT-MR815T................................................................................. 24
Electrical.................................................................................................... 24
Environmental........................................................................................... 24
Diagnostic LEDs........................................................................................ 24
Certification............................................................................................... 24
10Base-T Pin Assignments .............................................................................. 25
Connectors ................................................................................................. 25
Straight-through Wiring .................................................................................. 26
Crossover Wiring .............................................................................................. 26
5 - 4 - 3 Rule...................................................................................................... 27
Appendix B
Glossary .......................................................................................................... 29
Appendix C
Technical Support Fax Order ................................................................... 35
Incident Summary............................................................................................ 35
Appendix D
AT-MR415T/AT-MR815T Installation Guide Feedback ....................... 37
Appendix E
Where To Find Us ......................................................................................... 39

1
Overview
Welcome to Allied Telesyn International!
Allied Telesyn’s AT-MR415T/AT-MR815T Micro Repeaters represent a
compact, inexpensive solution for Local Area Network (LAN) applications.
AT-MR415T/AT-MR815T Micro Repeaters combine 10 Mbps of 10Base-T
Ethernet connectivity with the same features and functionality of larger,more
expensive repeaters. At the same time, they support full-length cable
segments with the maximum number of supported devices allowed within
IEEE standards.
While identical in structure, the AT-MR415T Micro Repeater differs from the
AT-MR815T Micro Repeater in that the former has four (4) Unshielded
Twisted Pair (UTP) ports whereas the latter has eight (8).
Features
Each AT-MR415T/AT-MR815T Micro Repeater:
❑
Is IEEE 802.3 compliant
❑
Is 10Base-T and Ethernet Version 1.0 and 2.0 compatible
❑
Has automatic packet regeneration, detection and correction
❑
Supports automatic port disconnect/connect (auto partitioning)
❑
Has test link capabilities
❑
Contains auto partitioning and jabber lock-up protection
❑ Has status and diagnostic LEDs
❑
Supportsa10Base-TuplinkportandaMDI/MDI-Xswitchfornetwork
cascading
❑
Can be placed with other hubs in an optional standing chassis
Chapter 1
Product Description

Product Description
2
Package Contents
The parts included with this product are listed below. Please check the
equipment you received to make sure you have everything. Note that a
correction or addendum may be included in the package.
❑
An AT-MR415T or AT-MR815T Micro Repeater
❑
One direct plug in type approved adapter rated 7.5Vdc, 500mA
❑
Customer Information and Registration Card
❑
Product Warranty Booklet
❑
Four (4) Rubber feet for desktop placement
Latest Technologies
ASIC/SMT
AT-MR415T/AT-MR815T Micro Repeaters have incorporated the latest
technologies, including custom Application Specific Integrated Circuit (ASIC)
and Surface Mount Technology (SMT).This results in enhanced functionality,
increased reliability and improved performance.
Packet Regeneration
Packet regeneration is a high-performance network feature that includes
packet preamble regeneration, retiming of data packets and the extension of
collision fragments.
Link Integrity
The IEEE 802.3 defined link integrity test function continually monitors the
twisted pair cable to ensure link continuity of the receive pair between the
user node and the repeater.
Auto Partitioning
Also known as segmentation, each network segment will be automatically
partitioned whenever 32 consecutive collisions are seen on the segment.A
single valid packet will reset the segment and return it to an auto
reconnecting state.

AT-MR415T and AT-MR815T Installation Guide
3
Jabber Lock-up Protection
Jabber lock-up protects the repeater from being overrun with data packets. It
does this by isolating those segments with transmitted packets that exceed the
maximum packet length.That is, jabber lock-up automatically prevents
transmitted data from reaching the repeater if the transmitted data time
exceeds a specified duration (usually 5 ms).
AT-MR415T
Figure 1 shows the front panel of an AT-MR415T.
Figure 1: AT-MR415T Front Panel
Light Emitting Diodes (LEDs)
Four Link LEDs show the connectivity of each network port.Three additional
LEDs indicate Activity, Collision and Power for the repeater itself.
Note that LEDs will not reflect real-time activity since a data packet is too fast
for the human eye to distinguish. therefore the repeater artificially stretches
the LED “on” time for easier observation.
❑
LINK ON lamp (green)
— There is a green LINK ON LED for each 10Base-T port. This LED
is lighted when the twisted pair cable for the corresponding
10Base-T port is properly connected, the port has established a
valid link, and the automatic port connect/disconnect function has
been enabled.
Inother words, theLED islighted anytime a valid communications
link has been established for the corresponding port. If the LED is
not lighted, check the twisted pair cable to ensure a proper port
connection has been made.



4


Product Description
4
❑
ACTIVITY lamp (green)
— This LED is lighted when packets are being sent or received
through the repeater.
❑
COLLISION lamp (amber)
— The COLLISION LED will flicker to indicate a collision. While
occasional collisions are normal in Ethernet networks, a constantly
illuminated COLLISION LED may indicate that there is a port
with excessive traffic problems.
— Continual flickering of the COLLISION LED may also indicate
excessive frame collisions on a segment. This may be caused by an
overloaded segment, a faulty cable, or a bad connection.
— If this LED is lighted for an extended period of time, it is possible
that there is a problem with the transceiver or cable.
❑
POWER lamp (green)
— This LED lights when power is being received by the repeater from
the AC to DC adapter.
Figure 2 shows the back panel of an AT-MR415T.
Figure 2: AT-MR415T Back Panel
Four UTP RJ45 network ports (including Port 4, an uplink port) are located on
the back panel. It also shows the Direct Current (DC) power receptacle which
is used in conjunction with the TUV-licensed Alternating Current (AC)
adapter which is provided.

AT-MR415T and AT-MR815T Installation Guide
5
❑
MDI MDI-X Toggle Switch
— This switch allows you to set the cascade port (the port directly to
the right of this switch). This cascade port, in turn, can be used to
either connect to another repeater or as a normal 10Base-T port.
The switch positions are as follows:
MDI (left position). This port can now be used to cascade to another
repeater.
MDI-X (right position). Use this port as a normal 10Base-T port.
❑ 10Base-T Connector
— There is one 10Base-T connector for each port on the unit. Connect
10Base-T cables (twisted pair cable, UTP) into the desired RJ-45
ports.
❑
DC Power Jack
— This connector is used to provide power to the unit using the AC
adapter.
AT-MR815T
Figure 3 shows the front panel of an AT-MR815T.
Figure 3: AT-MR815T Front Panel
Light Emitting Diodes (LEDs)
Eight LINK LEDs show the connectivity of each network port.Three
additional LEDs indicate Activity, Collision and Power for the repeater itself.
❑
LINK ON lamp (green)
— There is a green LED for each 10Base-T port. This LED is lighted
when the twisted pair cable for the corresponding 10Base-T port is
properly connected, the port has established a valid link and the
automatic port connect/disconnect function has been enabled.


Product Description
6
Inother words, theLED islighted anytime a valid communications
link has been established for the corresponding port. If the LED is
not lighted, check the twisted pair cable to ensure a proper port
connection has been made.
❑ACTIVITY lamp (green)
— This LED is lighted when packets are being sent or received
through the repeater.
❑COLLISION lamp (amber)
— The COLLISION LED will flicker to indicate a collision. While
occasional collisions are normal in Ethernet networks, a constantly
illuminated COLLISION LED may indicate that there is a port
with excessive traffic problems.
— Continual flickering of the COLLISION LED may also indicate
excessive frame collisions on a segment. This may be caused by an
overloaded segment, a faulty cable, or a bad connection.
— If this LED is lighted for an extended period of time, it is possible
that there is a problem with the transceiver or cable.
❑POWER lamp (green)
— This LED lights when power is being received by the repeater from
the AC to DC adapter.
Figure 4 shows the back panel of an AT-MR815T.
Figure 4: AT-MR815T back Panel
On the back panel are eight UTP RJ45 network ports (including Port 8, an
uplink port). It also shows the Direct Current (DC) power receptacle which is
used in conjunction with the TUV-licensed Alternating Current (AC) adapter
which is provided.

AT-MR415T and AT-MR815T Installation Guide
7
❑MDI MDI-X Toggle Switch
— This switch allows you to set the cascade port (the port directly to
the right of this switch). The cascade port, in turn, can be used to
either connect to another repeater or as a normal 10Base-T port.
The switch positions are as follows:
MDI (left position). This port can now be used to
cascade to another repeater
MDI-X (right position). Use this port as a normal
10Base-T port
❑10Base-T Connector
— There is one 10Base-T connector for each port on the unit. Connect
10Base-T cables (twisted pair cable, UTP) into the desired RJ-45
ports.
❑Power Jack
— This connector is used to provide power to the unit using the direct
plug in type approved adapter rated 7.5Vdc, 500mA.

9
Site Requirements
Ventilation
AT-MR415T/AT-MR815T Micro Repeatershave openings on both sides for
ventilation.Although these Micro Repeaters do not require an internal fan to
aid in cooling, adequate ventilation is required. Ensure that the ventilation
openings located on the sides of the chassis are never blocked.
Note
Maximum ambient temperature is 104oF (40oC).
Power
Be sure that the voltage and frequency to the AC adapter is compatible with
the country of use and, therefore, the power provided. Since there is no
external power switch, power is applied when the power cord from the AC
adapter is connected to the DC receptacle of your repeater.
Note
Power to the hub must be sourced only from adapter in the package or
direct plug in type approved adapter rated 7.5Vdc, 500mA.
Chapter 2
Installation

Installation
10
Table 1 shows the model variations and different power arrangements for
AT-MR415T/AT-MR815T Micro Repeaters:
Table 1: Model Configurations
UTP (RJ-45) Connectivity
A UTP cable with RJ-45 connectors is shown in Figure 5. For a 10Base-T link
between a repeater and a Medium Attachment Unit (MAU) or Network
Interface Controller (NIC), the cable is wired straight through.
Figure 5: RJ-45 Connector
10Base-T UTP cables can be up to 100 meters (328 ft.) in length.The cable
should be 22 to 26 AWG UTP wire with 100Ωimpedance.TheAT-MR415T/
AT-MR815T Micro Repeater uses RJ-45 modular connectors for 10Base-T
connections.
Note
Do not connect standard telephone line into a signal connector.
Model Location Voltage
AT-MR415T-10 North America 90/120 VAC
AT-MR815T-10 North America 90/120 VAC
AT-MR415T-20 Europe/Asia 200/240 VAC
AT-MR815T-20 Europe/Asia 200/240 VAC
AT-MR415T-30 United Kingdom 200/240 VAC
AT-MR815T-30 United Kingdom 200/240 VAC