Allied Telesis AT-FH724SW, AT-FH716SW, AT-FH716, AT-FH708SW, AT-FH712SW User Manual

AT-FH708SW
AT-FH712SW
AT-FH716SW
AT-FH724SW
AT-FH716

Dual-speed Hubs

Installation Guide

PN 613-10710-00 Rev. G

Copyright  1999 Allied Telesyn International, Corp.
960 Stewart Drive Suite B, Sunnyvale CA 94086 USA

All rights reserved. No part of this publication may be reproduced without prior written permission
from Allied Telesyn International, Corp.

Ethernet is a registered trademark of Xerox Corporation. All other product names, company names,
logos or other designations mentioned herein are trademarks or registered trademarks of their
respective owners.

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.

Statements

AT-FH708SW, AT-FH712SW, AT-FH716SW, AT-FH724SW
or AT-FH716 in a Stacked Configuration

FCC Warning

RADIATED ENERGY
U.S. Federal Communications

Note: This equipment has been tested and found to comply with the limits for a
Class A digital device pursuant to Part 15 of FCC Rules. These limits are designed
to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in
accordance with this instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the
interference at his own expense.

Note: Modifications or changes not expressly approved of by the manufacturer or
the FCC, can void your right to operate this equipment.

Use Category 3, 4, or 5 unshielded or shielded twisted-pair cable for all 10 Mbps
RJ45 connections, and Category 5 unshielded or shielded twisted-pair for all 100
Mbps RJ45 connections.

Class A (Canada Department of Communications)

Industry Canada

This Class A digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.

Cet appareil numérique de la classe A respecte toutes les exigences du Règlement
sur le matériel brouilleur du Canada.

iii

CE Mark Warning

This is a Class A product. In a domestic environment, this product may cause
radio interference in which case the user may be required to take adequate
measures.

This is to certify that this product complies with ISO/IEC Guide 22 and EN45014.
It confirms to the following specifications:

EMC: EN55022 (1988)/CISPR-22(1985) Class A

IEC1000-4-2(1995) 4kV CD, 8kV AD
IEC1000-4-3(1995) 3V/m
IEC1000-4-4(1995) 1kV - (power line), 0.5kV - signal

line

IEC1000-4-6(1995) 3Vrms

iv

Statements

AT-FH708SW, AT-FH712SW, AT-FH716SW, AT-FH724SW,
AT-FH716 in a Standalone Operation Only

FCC Warning

U.S. Federal Communications Commission

DECLARATION OF CONFORMITY

Manufacture Name: Allied Telesyn International, Corp.
Manufacture Address: 960 Stewart Drive, Suite B

Manufacture Telephone: [phone]
Declares that the Product: Dual-speed hubs
Model Numbers: AT-FH708SW, AT-FH712SW, AT-FH716SW,

This product 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 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 encouraged 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.

WARNING

RJ45 connections, and Category 5 shielded twisted-pair for all 100 Mbps RJ45 connections to
comply with Class B emission limits. If not used with shielded cables, this product may cause radio
interference in which case the user may be required to take adequate measures to reduce interference
levels.

: This product requires only Category 3, 4, or 5 shielded twisted-pair cable for all 10 Mbps

Sunnyvale, CA 94086 USA

AT-FH724SW, AT-FH716

Canadian Department of Commissions

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.

v

AT-FH700 Series Hubs Installation Guide

CE Mark Warning

This is to certify that this product complies with ISO/IEC Guide 22 and EN45014.
It confirms to the following specifications:

EMC: EN55022 (1988)/CISPR-22(1985) Class B

IEC1000-4-2(1995) 4kV CD, 8kV AD
IEC1000-4-3(1995) 3V/m
IEC1000-4-4(1995) 1kV - (power line), 0.5kV - signal

line

IEC1000-4-6(1995) 3Vrms

Warning

This product requires shielded cables to comply with Class B emission limits.
If not used with shielded cables, this product may cause radio interference in
which case the user may be required to take adequate measures.

This product complies with the requirements of the Low Voltage Directive 73/23/
EEC and the EMC Directive 89/336/EEC.

Warning

Do not plug a phone jack connector in the RJ45 port. This may damage the
device.

AT-FH708SW, AT-FH716SW and AT-FH716 in a Stacked or Standalone Operation

Safety Compliance
UnderWriters Laboratories, Inc. (USA)

vi

Statements

AT-FH712SW and AT-FH724SW in a Stacked or Standalone Operation

Safety Compliance CSA/NRTL

Important!

Wichtige Sicherheitshinweise

Before making connections, make sure you have the correct cord set.

1. Bitte lesen Sie sich diese Hinweise sorgfältig durch.

2. Heben Sie diese Anleitung für den späteren Gebrauch auf.

3. Vor jedem Reinigen ist das Gerät vom Stromnetz zu trennen. Verwenden
Sie keine Flüssig- oder Aerosolreiniger. Am besten dient ein
angefeuchtetes Tuch zur Reinigung.

4. Um eine Beschädigung des Gerätes zu vermeiden sollten Sie nur
Zubehörteile verwenden, die vom Hersteller zugelassen sind.

5. Das Gerät ist vor Feuchtigkeit zu schützen.

6. Bei der Aufstellung des Gerätes ist auf sicheren Stand zu achten. Ein
Kippen oder Fallen könnte Verletzungen hervorrufen. Verwenden Sie
nur sichere Standorte und beachten Sie die Aufstellhinweise des
Herstellers.

7. Die Belüftungsöffnungen dienen zur Luftzirkulation die das Gerät vor
Überhitzung schützt. Sorgen Sie dafür, daß diese Öffnungen nicht
abgedeckt werden.

8. Beachten Sie beim Anschluß an das Stromnetz die Anschlußwerte.

9. Die Netzanschlußsteckdose muß aus Gründen der elektrischen
Sicherheit einen Schutzleiterkontakt haben.

10. Verlegen Sie die Netzanschlußleitung so daß niemand darüber fallen
kann. Es sollte auch nichts auf der Leitung abgestellt werden.

11. Alle Hinweise und Warnungen die sich am Gerät befinden sind zu
beachten.

12. Wird das Gerät über einen längeren Zeitraum nicht benutzt, sollten Sie es
vom Stromnetz trennen. Somit wird im Falle einer Überspannung eine
Beschädigung vermieden.

13. Durch die Lüftungsöffnungen dürfen niemals Gegenstände oder
Flüssigkeiten in das Gerät gelangen. Dies könnte einen Brand bzw.
elektrischen Schlag auslösen.

vii

AT-FH700 Series Hubs Installation Guide

14. Öffnen Sie niemals das Gerät. Das Gerät darf aus Gründen der
elektrischen Sicherheit nur von authorisiertem Servicepersonal geöffnet
werden.

15. Wenn folgende Situationen auftreten ist das Gerät vom Stromnetz zu
trennen und von einer qualifizierten Servicestelle zu überprüfen:

a. Netzkabel oder Netzstecker sind beschädigt.

b. Flüssigkeit ist in das Gerät eingedrungen.

c. Das Gerät war Feuchtigkeit ausgesetzt.

d. Wenn das Gerät nicht der Bedienungsanleitung entsprechend

funktioniert oder Sie mit Hilfe dieser Anleitung keine Verbesserung
erzielen.

e. Das Gerät ist gefallen und/oder das Gehäuse ist beschädigt.

f. Wenn das Gerät deutliche Anzeichen eines Defektes aufweist.

16. Bei Reparaturen dürfen nur Orginalersatzteile bzw. den Orginalteilen
entsprechende Teile verwendet werden. Der Einsatz von ungeeigneten
Ersatzteilen kann eine weitere Beschädigung hervorrufen.

17. Wenden Sie sich mit allen Fragen die Service und Reparatur betreffen an
Ihren Servicepartner. Somit stellen Sie die Betriebssicherheit des Gerätes
sicher.

viii

Table of Content

Statements

AT-FH708SW, AT-FH712SW, AT-FH716SW, AT-FH724SW or

AT-FH716 in a Stacked Configuration............................................................... iii

FCC Warning................................................................................................... iii

Class A (Canada Department of Communications) .....................................iii

CE Mark Warning ........................................................................................... iii

AT-FH708SW, AT-FH712SW, AT-FH716SW, AT-FH724SW,

AT-FH716 in a Standalone Operation Only ...................................................... iv

FCC Warning................................................................................................... iv

CE Mark Warning ............................................................................................ v

AT-FH708SW, AT-FH716SW and AT-FH716 in a Stacked or

Standalone Operation........................................................................................... v

AT-FH712SW and AT-FH724SW in a Stacked or Standalone Operation .......... vi

Safety Compliance CSA/NRTL....................................................................... vi

Chapter 1

Product Description

Overview................................................................................................................... 1

Key Features ............................................................................................................. 3

Front Panels ............................................................................................................. 4

Front Panel LEDs ............................................................................................. 5

Front Panel Connectors ................................................................................... 6

MDI /MDI-X Switch ........................................................................................ 6

Rear Panel................................................................................................................. 7

Power Supply and Fan ..................................................................................... 7

Stacking Connectors ........................................................................................ 7

Rackmount Options ................................................................................................ 7

.............................................................................................................. iii

............................................................................................... 1

ix

Chapter 2

Installatio

.............................................................................................................. 9

Verifying Package Contents..................................................................................... 9

Site Requirements .................................................................................................. 10

Standalone Desktop Installation ........................................................................... 10

Rackmounting the Hubs........................................................................................ 11

Stacking the Hubs .................................................................................................. 12

Connecting Network Devices................................................................................ 13

Connecting Ethernet or Fast Ethernet Workstations ...................................13

Using An External Switch (AT-FH716) ........................................................14

Using the Integrated Switch Module............................................................. 15

Connecting Devices to the MDI/MDI-X Ports............................................. 16

Cable Length and Cascading Considerations ............................................... 16

Chapter 3

Troubleshooting

................................................................................................... 17

Contacting Allied Telesyn’s Technical Support ...................................................17

Verifying System Information............................................................................... 17

Diagnosing Hub Indicators ................................................................................... 18

Power and Cooling Problems................................................................................ 18

Appendix A

Product Specifications for the AT-FH700 Series Hubs

......................................19

Appendix B

Technical Support Fax Order

.............................................................................. 21

Incident Summary ................................................................................................. 21

Appendix C

AT-FH700 Series Hubs Installation Guide Feedbac

........................................23

Appendix D

Where To Find Us

................................................................................................ 25

x

Chapter 1

Product Description

Overview

This chapter describes the features of the AT-FH700 Series of stackable dual-speed
Fast Ethernet hubs:

!

AT-FH708SW

!

AT-FH712SW

!

AT-FH716SW

!

AT-FH724SW

!

AT-FH716

The AT-FH700 Series hubs were designed to provide a compact, flexible solution
for corporate workgroups or small and medium businesses. These hubs provide 8,
12, 16 and 24 dual-speed ports (10/100 Mbps). The hubs contain two internal
repeater buses: one for 10 Mbps traffic and another for 100 Mbps traffic.

The AT-FH708SW, AT-FH712SW, AT-FH716SW and AT-FH724SW hubs
include an integrated two-port switch module that connects the 10 Mbps and 100
Mbps repeater buses. The switch module allows communications between devices
operating at different speeds.

On the AT-FH716 model, traffic between connected devices of the same speed are
confined within the appropriate repeater bus. Each of these ports automatically
senses the speed of the attached device, and channels the data to the appropriate
10 Mbps or 100 Mbps segment.

1

Product Description

Table 1 summarizes the features of each hub model:

Table 1

Model Description

AT-FH708SW Eight 10/100 Mbps twisted-pair ports

AT-FH712SW Twelve 10/100 Mbps twisted-pair ports

AT-FH716SW Sixteen 10/100 Mbps twisted-pair ports

AT-FH724SW Twenty-four 10/100 Mbps twisted-pair ports

AT-FH700 Series Hub Models and Descripti o n

One MDI/MDI-X switch associated with Port 8

Integrated switch module

LED indicators for Power, Collision, Activity, Partition, and Link 10/100

One MDI/MDI-X switch associated with Port 12

Integrated switch module

LED indicators for Power, Collision, Activity, Partition, and Link 10/100

One MDI/MDI-X switch associated with Port 16

Integrated switch module

LED indicators for Power, Collision, Activity, Partition, and Link 10/100

One MDI/MDI-X switch associated with Port 24

Integrated switch module

LED indicators for Power, Collision, Activity, Partition, and Link 10/100

AT-FH716 Sixteen 10/100 Mbps twisted-pair (ports

One MDI/MDI-X switch associated with Port 16

LED indicators for Power, Collision, Activity, Partition, and Link 10/100

Note

For definitions of technical terms associated with Allied Telesyn’s
products, refer to the Glossary on Allied Telesyn’s website at

www.alliedtelesyn.com

2

.

AT-FH700 Series Hubs Installation Guide

Key Features

The AT-FH700 Series hubs provide the following key features:

!

IEEE 802.3 (10Base-T) and IEEE 802.3u (100Base-TX) compliant

!

Class II repeater

!

8, 12, 16 and 24 10/100 Mbps dual-speed Fast Ethernet ports (RJ45
connectors)

!

Category 5 UTP/STP cables for 10 Mbps and 100 Mbps transmissions;
Category 3 UTP cables for 10 Mbps transmission only

!

Auto-negotiate for 10/100 Mbps transmission speed

!

Stacked configuration of up to six hubs with the use of a cascade cable, or
standalone configuration

!

Integrated switch module in the AT-FH708SW, AT-FH712SW,
AT-FH716SW and AT-FH724SW models to allow transmissions
between 10 Mbps and 100 Mbps devices connected to the hub stack

!

Desktop or rack mounting options

3

Product Description

Front Panels

Figure 1 through Figure 3 show the hub front panels.

10BASE-T/100BASE-TX 8 PORT DUAL SPEED HUB

COLLISION

ACTIVITY

POWER

10BASE-T/100BASE-TX 16 PORT ETHERNET HUB

COLLISION

ACTIVITY

POWER

10BASE-T/100BASE-TX 16 PORT DUAL SPEED HUB

COLLISION

ACTIVITY

POWER

Power

10M 100M

10M 100M

Figure 1

10M 100M

Segment LEDs

YELLOW 10Mbps GREEN 100Mbps

PARTITION

12345678

LINK

1 X2 X3 X4 X 5 X6 X7 X8

MDI/MDI-X Switch (associated with the last port)

PARTITION

1234

LINK

YELLOW 10Mbps GREEN 100Mbps

PARTITION

56789101112

LINK

5 X 6 X 7 X 8 X

AT-FH708SW and AT-FH712SW Front Panels

Port LEDs

PARTITION

12345678

LINK

YELLOW 10Mbps GREEN 100Mbps

PARTITION

9 10111213141516

LINK

Figure 2

AT-FH716SW Front Panel

1 X 2 X 3 X 4 X 5 X 6 X 7 X 8 X

9 X 10 X 11 X 12 X 13 X 14 X 15 X 16

1 X 2 X 3 X 4 X

9 X 10 X 11 X 12

To PC

To Hub

To PC

To Hub

To PC

To Hub

10BASE-T/100BASE-TX 16 PORT ETHERNET HUB

POWER

10BASE-T/100BASE-TX 24PORT DUAL SPEED HUB

COL

100M

ACT

COL

10M

PWR

ACT

4

COLLISION

10M 100M

ACTIVITY

1 2 3 4 5 6 7 8 9 10 11 12

Yellow 10Mbps GREEN 100Mbps

13 14 15 16 17 18 19 20 21 22 23 24

PARTITION

PARTITION

LINK

LINK

PARTITION

LINK

PARTITION

LINK

Figure 4

12345678

YELLOW 10Mbps GREEN 100Mbps

9 10111213141516

Figure 3

AT-FH716 Front Panel

1 X 2 X 3 X 4 X 5 X 6 X 7 X 8 X

13 X 14X 15X 16X 17 X 18 X 19 X 20X

AT-FH724SW Front Panel

1 X 2 X 3 X 4 X 5 X 6 X 7 X 8 X

9 X 10 X 11 X 12 X 13 X 14 X 15 X 16

9 X 10 X 11 X 12 X

21X 22X 23X 24

To PC

To Hub

To PC

To Hub

AT-FH700 Series Hubs Installation Guide

COL

ACT

10M

COL

ACT

100M

1 2 3 4 5 6 7 8 9 10 11 12

13 14 15 16 17 18 19 20 21 22 23 24

Yellow 10Mbps GREEN 100Mbps

LINK

PARTITION

LINK

PARTITION

Front Panel LEDs

The AT-FH700 Series hubs’ front panel LEDs provide status in three areas:

!

System-wide status

!

Segment status

!

Per-port status

YELLOW 10Mbps GREEN 100Mbps

PARTITION

12345678

LINK

Figure 5

A Close Up of the Port LEDs for the 8-Port Model

Figure 6

A Close Up of the Port LEDs for AT-FH724SW

5

Product Description

For detailed explanations on the hubs’ front panel LEDs, see Tabl e2.

Table 2

LED Description

System Status Indicator:

Power

Segment Status Indicators (one each for the 10 Mbps and 100 Mbps segments):

Collision

Activity

Port Status Indicators:

Partition

Link 10/100M

Steady green

Flashing amber

Mbps or 100 Mbps domain.

Flashing green

traversing the respective segment.

Steady amber or red

means there is no link on the port.

Off

Steady green

link.

Steady amber

LED Indicators

indicates the hub is receiving power.

indicates a collision has occurred in the 10

indicates 10 Mbps or 100 Mbps traffic is

indicates the port has been partitioned.

indicates the port has established a 100 Mbps

indicates the port has established a 10 Mbps link.

Front Panel Connectors

All network ports on the AT-FH700 Series hubs use shielded RJ45 connectors. For
10 Mbps connections, use Category 3 or above. For 100 Mbps connections, use
Category 5 or above cables only.

MDI /MDI-X Switch

Each hub has a MDI/MDI-X switch associated with either Port 8, Port 12, Port 16
or Port 24. The switch changes the associated port between MDI and MDI-X. The
two settings provide you the flexibility of connecting any type of device with a
straight-through cable:

!

To Hub

(in), for cascading to a switch or another hub

To PC

!

(out), for connection to a DTE (an end station or server)

Refer to Chapter 2 for additional information on cable lengths when cascading
hubs.

6

AT-FH700 Series Hubs Installation Guide

Rear Panel

The rear panel shown in Figure 7 is common to all models.

OUT IN

100-240VAC 50-60Hz, 0.5A

Figure 7

AT-FH700 Series Rear Panel

Power Supply and Fan

Power connection to the AT-FH700 Series hubs are done through the power
receptacle in the rear panel. The hubs use a universal internal switching power
supply with 100 to 120 VAC, or 200 to 240 VAC (autoranging), 50/60 Hz input
rating. The maximum power consumption is 27W. Cooling fans help maintain the
hub’s optimal temperature.

Stacking Connectors

Each AT-FH700 Series hub has two stacking connectors in the rear panel,

Out

, for inter-repeater connectivity. You can connect up to

six

hubs in a stack.

In

and

Allied Telesyn supplies one stacking cable with each hub.

The hubs are fully stackable based on the following parameters:

!

Units can be used as standalone units, or up to six units can be stacked
using stacking cables-either SW, non-SW or both in combination.

!

At least one SW unit is required to enable full communication for all
ports.

!

Where multiple SW units are stacked, any redundant switch circuits are
automatically disabled.

More details on using the stacking connectors are described later in Chapter 2.

Rackmount Options

Rackmount kits are provided if you want to install your hubs in a standard 19-inch
rack. Procedures for rackmounting are provided in Chapter 2.

7

Chapter 2

Installation

Verifying Package Contents

Make sure that the package includes the following items:

!

One AT-FH700 Series hub

!

One AC power cord

!

Two rackmount brackets and eight screws

!

Four self-adhesive rubber feet

!

One stacking cable

!

Warranty card

!

This installation guide

If any of the above items is damaged or missing, contact your representative
immediately.

9

Installation

Site Requirements

Make sure you observe the following site requirements:

!

Choose a location that is less than 100 m (328 ft) away from servers,
workstations, or switches.

Caution

Category 5 UTP/STP cables are environment-sensitive. Make sure the
cable route is not too close to electrical noise sources such as power lines
or fluorescent lights.

!

Place the hub in a dust-free and moisture-free environment.

!

Do not block ventilation openings on the unit.

!

Do not place heavy objects on top of the hub.

!

Use dedicated power circuits or power conditioners to supply power to
the hub.

Standalone Desktop Installation

1. Attach the four self-adhesive rubber feet to the bottom of the hub,
positioning them in the indentations.

2. Place the hub on a flat, level surface where power is easily accessible.

3. Attach one end of the power cord to the back of the hub and the other end
to the power source.

Make sure the

4. Attach the data cables and observe normal operation as indicated by the
port LEDs.

You are done with standalone desktop installation.

10

Power

LED on the front panel lights green.

AT-FH700 Series Hubs Installation Guide

Rackmounting the Hubs

You will need a Phillips screwdriver for this installation.

1. Disconnect all data cables and then the power cord, if attached.

2. Attach the brackets to the side of the hub with the screws provided. See
Figure 8.

Figure 8

Attaching the Brackets

3. Mount the hub to the 19-inch rack using standard screws (not provided).
See Figur e9.

10BASE-T/100BASE-TX 16 PORT DUAL SPEED HUB

COLLISION

10M 100M

ACTIVITY

POWER

10BASE-T/100BASE-TX 8 PORT DUAL SPEED HUB

COLLISION

10M 100M

ACTIVITY

POWER

10BASE-T/100BASE-TX 8 PORT DUAL SPEED HUB

COLLISION

10M 100M

ACTIVITY

POWER

PARTITION

12345678

LINK

YELLOW 10Mbps GREEN 100Mbps

PARTITION

910111213141516

LINK

YELLOW 10Mbps GREEN 100Mbps

PARTITION

12345678

LINK

YELLOW 10Mbps GREEN 100Mbps

PARTITION

12345678

LINK

Figure 9

1 X2 X3 X4 X 5 X6 X7 X8 X

9 X 10 X 11 X 12 X 13 X 14 X 15 X 16

1 X2 X3 X4 X 5 X6 X7 X8

1 X2 X3 X4 X 5 X6 X7 X8

Rackmounted Hubs

To PC

To Hub

To PC

To Hub

To PC

To Hub

4. Reconnect the power cord and then the data cables.

11

Installation

Stacking the Hubs

A stacking feature in each AT-FH700 Series hub’s rear panel gives you the
advantage of stacking up to six AT-FH700 Series hubs and still have all front panel
ports available for station connections. Stacking six
maximum of 96 connections belonging to the same collision domain.

Allied Telesyn ships a stacking cable with every AT-FH700 Series hub. Do not use
any other cable with the hubs’ stacking ports.

To stack the hubs with the stacking cables:

16-port hubs provides you a

1. Connect one end of the cable to the

2. Connect the other end to the

Figure 10

Stacking AT-FH700 Series Hubs

Out

port of the top hub.

In

port of the next hub. See Figur e10.

3. Connect additional hubs using the same scheme (up to 6 hubs), and
using only the stacking cable that came with your hub.

See the section, Connecting Network Devices” beginning on page 13, for
additional information on connecting 10 Mbps and 100 Mbps workstations and
cabling restrictions when cascading hubs.

12

AT-FH700 Series Hubs Installation Guide

Connecting Network Devices

This section shows you how to connect:

!

Ethernet and Fast Ethernet workstations

!

An external Fast Ethernet switch

!

A hub with the integrated switch module (either the AT-FH708SW,
AT-FH712SW, AT-FH716SW or AT-FH724SW)

!

Other network devices via cascading

This section also includes important information on cable length restrictions
when cascading hubs.

Connecting Ethernet or Fast Ethernet Workstations

Use a straight-through wired UTP Cat 5 cable with RJ45 connectors to connect
either a 10Base-T or 100Base-TX device directly to the hub’s port (1 through 16).
Do not exceed a maximum of 100 m (328 ft). The hub’s autosensing capability
does not require additional user configuration and enables transmission between
devices of the same speeds (stations A and B in Figur e11).

AT-FH716

C

P
o
T

b
u
H

o
T

ABC

10 Mbps

10 Mbps 100 Mbps 100 Mbps

Figure 11

Connecting Ethernet Hubs

D

When using the AT-FH716 model as in Figu re11, a 10 Mbps device (station A or
B) cannot transmit to a 100 Mbps device (station C or D).

13

Installation

Using An External Switch (AT-FH716)

If you require communication between devices of different transmission speeds
across different domains, you may install an external 10/100 Mbps Fast Ethernet
switch to the AT-FH716 hub (Figu re12).

AT-8124 External

AT-FH716

Switch

0BASE-TX

10
ASE-T /
B

0
1

CH
T

SWI
NET
R

E

TH
AST E
F

10BASE-T / 100BASE-TX

10 Mbps

100 Mbps

C

P
o
T

b
u

H
o
T

STATUS

RS-232

T

TERMINAL POR

CTIVITY

PORT A

AB C D

10 Mbps 100 Mbps 10 Mbps 100 Mbps

Figure 12

Transmission Through an External Switch

With the external switch solution, two separate hub ports are required, one for 10
Mbps communication, and the other for 100 Mbps. On the hub, use the port with
an associated MDI/MDI-X switch to make one of the connections to the 10/100
Mbps external switch. On the external switch, configure one of its ports to enforce
10 Mbps fixed transmission speed. This way, devices belonging to the 10 Mbps
domain can transmit information to devices in the100 Mbps domain via the
external switch, and vice versa.

14

AT-FH700 Series Hubs Installation Guide

Using the Integrated Switch Module

Using a hub with the integrated switch module (models AT-FH708SW,
AT-FH712SW, AT-FH716SW or AT-FH724SW) is the easiest and most cost­effective solution to enable communication between devices of dissimilar speeds.
You can use either of these hub models for simple standalone configurations to
connect both 10 Mbps and 100 Mbps devices.

In Figure 13, an AT-FH716SW hub becomes part of a hub stack to which
workstations of varying speeds are connected. The AT-FH716SW’s switching
module enables the exchange of information between 10 Mbps and 100 Mbps
stations. The learning function of the internal switch module stores the node
address and the corresponding segment number (i.e., bus 1 or 2) of each incoming
packet in a routing table. This information is used to confine traffic exchanged
between legacy Ethernet devices within the slower repeater bus, leaving the other
bus free to handle Fast Ethernet traffic. By confining traffic within its respective
collision domain, the overall load on the network is significantly reduced

AT-FH716SW

C

P
o
T

b
u
H

o
T

AT-FH716

C

P
o
T

b
u
H

o
T

A

10 Mbps

C

100 Mbps

Figure 13

Transmission Through a Hub With the Integrated Switch Module

D

100 Mbps

B

100 Mbps

Concerning multiple switching module and auto-bypass support:

When using more than one AT-FH708SW, AT-FH712SW, AT-FH716SW or
AT-FH724SW in a stack, only one hub with a switching module will be active at
any time-the active module will be the uppermost. Stacking order is unimportant,
the switching module does not have to be on top; however, if there are two
switching modules in a stack, then the uppermost module is active and the lower
one is in standby mode.

Note

The stack with multiple switches cannot operate correctly if there is a unit
powered off between two switch units.

15

Installation

Connecting Devices to the MDI/MDI-X Ports

The last port of the hub (Port 8, Port 12, Port 16 or Port 24) has an associated
MDI/MDI-X switch that changes the port from MDI to MDI-X, and vice versa.

Connect any 10 Mbps or 100 Mbps device to the port with a straight-through cable
and use the following settings:

!

Push the switch

In (To Hub,

or MDI) and cascade to a switch or another

hub to the port.

!

Push the switch

Out (To PC,

or MDI-X) and connect a DTE (an end

station or server) to the port.

Port 8

MDI /MDI-X switch

To PC

To Hub

6 X 7 X 8

Figure 14

Cable Length and Cascading Considerations

When cascading to another hub, the attached hubs function as a single logical hub,
and all ports on the attached hubs belong to the same collision domain. You must
consider the following restrictions on cable lengths and number of cascaded hubs:

When cascading to a Fast Ethernet hub, limit the cascade to two hubs. All end­node devices (workstations or servers) must be within 100 m (328 ft) of the hub.
Overall length between any two nodes must not exceed 205 m (672 ft). The easiest
way to cascade two Fast Ethernet hubs is to connect the MDI port on the front
panel to an MDI-X port on the other hub. For example, if End Nodes A and B are
linked to separate hubs in a two-hub system, each using 100 m (328 ft) of cable to
connect to their respective hubs, then the inter-hub cabling is limited to 5 m (16
ft). The only way to extend inter-hub cabling is to reduce the cable length
attaching the end nodes to their hubs. Based on the IEEE 802.3 specification, up to
four 10 Mbps hubs can be connected on a 10 Mbps cascade.

Closeup of the MDI/MDI-X Switch

16

Chapter 3

Troubleshooting

This chapter provides information to help you resolve problems you might
encounter while using the hubs.

Contacting Allied Telesyn’s Technical Support

If you are unable to fix any problems with the hub after trying the procedures in
this chapter, contact Allied Telesyn’s technical support department. Before doing
so, be prepared to give the following information:

!

Your equipment’s model number

!

A detailed description of the problem

Refer to Appendix D, “Where To Find Us,” for a list of Allied Telesyn worldwide
locations.

Verifying System Information

Verify that all attached devices have a valid connection. The hub monitors the link
status for each port. If any device is properly connected and transmitting a link
beat signal, the Link indicator on the front panel, lights up for the corresponding
port. If the Link indicator fails to light up when you connect a device, check the
following:

!

Be sure the twisted-pair cable is properly attached to the connected
device and the hub. The media connectors snap firmly into place when
attached.

!

Check if the cable is functioning properly by using it on another port and
device that is known to be working correctly.

!

Make sure the cable length does not exceed 100 m (328 ft). If you have
cascaded two Fast Ethernet hubs together, be sure the interhub cabling
does not exceed 5 m (16 ft).

17

Troubleshooting

!

Verify that the workstation’s adapter card is functioning properly by
installing it in another workstation that has been successfully connected
to the network.

!

Make sure all hubs cascaded together are powered up.

Diagnosing Hub Indicators

You can easily monitor the hub through its front panel indicators. This section
describes common problems you may encounter and possible solutions.

Symptom:

Link 10/100 indicator does not light up after making a
connection.

Cause:

Network interface (e.g., a network adapter card in the attached
device), network cable, or hub port is defective.

Solution:

Verify that the hub and attached device are powered on. Be sure
the cable is plugged into both the hub and corresponding device.
Verify that the proper cable type is used and its length does not
exceed specified limits. Check the adapter on the attached device
and cable connections for possible defects. Replace the defective
adapter card or cable if necessary.

Symptom:

Cause:

Solution:

Power indicator does not light up (green) after powering on.

Power outlet, power cord, or internal power supply is defective.

Check the power outlet by plugging in another device that is
known to function properly. Check the power cord with another
device. If these measures do not work, there might be a problem
with the power supply. Contact the nearest Allied Telesyn
location.

Power and Cooling Problems

If the power indicator does not turn on when the power cord is plugged in, you
may have a problem with the power outlet, power cord, or internal power supply
as previously discussed. However, if the unit powers off after running for a while,
check for loose power connections or power surges. Make sure the fan on the back
of the unit is unobstructed and running when power is reapplied to the hub. If the
fan is not running, call Allied Telesyn.

18

Appendix A

Product Specifications for the AT-FH700 Series Hubs

Standards Supported

Media

Number of Ports

AT-FH708SW

AT-FH712SW

AT-F H716 and
AT-FH716SW

AT-FH724SW

Segments

LED Indicators

Per device
Per segme nt
Per port

MDI/MDI-X

Hub Stacking

Integrated Switch Module

AT-FH708SW, AT-FH712SW,
AT-FH716SW and
AT-FH724SW

Mounting

IEEE 802.3 10Base-T Ethernet
IEEE 802.3u 100Base-TX Ethernet

Category 5 UTP/STP (10 Mbps and 100 Mbps)
Category 3 UTP (10 Mbps only)

Eight 10/100 Mbps, auto-negotiating, RJ45
connectors

Twelve 10/100 Mbps, auto-negotiating, RJ45
connectors

Sixteen 10/100 Mbps, auto-negotiating, RJ45
connectors

Twenty-four 10/100 Mbps, auto-negotiating,
RJ45 connectors

One 10 Mbps
One 100 Mbps

Power

Collision, Activity

Link 10/100M, Partition

One port (Port 8, Port 12 or Port 16) associated
with MDI/MDI-X switch

6 hubs per stack via stacking cables

For 10 Mbps and 100 Mbps segment
communication; 10/100 Mbps rate adoption and
packet filtering between the two collision
domains; store and forward mode

Brackets for 19-inch rack mounting

19

Product Specifications for the AT-FH700 Series Hubs

Physical Specifications

Dimensions
We ight

330 x 204 x 44 mm (13 x 8 x 1.72 in)

2.1 kg (4.6 lb)

Electrical Specifications

Input line frequency
Input voltage
AC Power consumption

50-60 Hz

100-240 VAC

100-240 VAC, 50/60 Hz, 0.5A

Environmental Specifications

Operating temperature
Storage temperature
Operating humidity

Electromagnetic Immunity

Safety Agency Approvals

0° to 50° C

–30° to 60° C

5% to 95% non-condensing

IEC 1000-4-2/3/4/6

UL, CSA, TUV/GS on all models except
AT-FH712SW, AT-FH724SW

CSA/NRTL, TUV/GS on the AT-FH712SW,
AT-FH724SW

EMI Certifications

CE Mark
FCC Class A in stacked configuration
FCC Class B in standalone configuration

20

Appendix B

Technical Support Fax Order

Name___________________________________________________________________

Company ________________________________________________________________

Address _________________________________________________________________

City ________________________State/Province ________________________________

Zip/Postal Code ___________________ Country_________________________________

Phone _______________________________Fax_________________________________

Incident Summary

Model number of Allied Telesyn product I am using ______________________________

Network software products I am using_________________________________________

________________________________________________________________

Brief summary of problem __________________________________________________

________________________________________________________________

Conditions (list the steps that led up to the problem) _____________________________

________________________________________________________________
________________________________________________________________

Detailed description (use separate sheet, if necessary)

________________________________________________________________
________________________________________________________________
________________________________________________________________

When completed, fax this sheet to the appropriate Allied Telesyn office. Fax numbers can
be found on page25.

21

Appendix C

AT-FH700 Series Hubs Installation Guid
Feedback

Please tell us what additional information you would like to see discussed in this
guide. If there are topics you would like information on that were not covered in
this guide, please photocopy this page, answer the questions and fax or mail this
form back to Allied Telesyn. The mailing address and fax number are at the
bottom of the page. Your comments are valuable when we plan future revisions of
the guide.

I found the following the most valuable ________________________________

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

I would like the following more develope _____________________________

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

I would find the guide more useful if __________________________________

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

Please fax or mail your feedback. Fax to 1-408-736-0100. Or mail to:

Allied Telesyn International, Corp.

c/o Technical Communications
960 Stewart Drive, Suite B
Sunnyvale, CA 94086 USA

PN 613-10710-00 Rev G

23

Appendix D

Where To Find Us

For Technical Support or Service

Location Phone Fax

Americas

United States, Canada, Mexico, Central America, South
America

Asia

Singapore, Taiwan, Thailand, Malaysia, Indonesia, Korea,
Philippines, China, India

Australia

Australia, New Zealand

France

France, Belgium, Luxembourg, The Netherlands, Middle
East, Africa

Germany

Germany, Switzerland, Austria, Eastern Europe

Hong Kong

Italy

Italy, Spain, Portugal, Greece, Turkey, Israel

Japan

United Kingdom

United Kingdom, Denmark, Norway, Sweden, Finland,
Iceland

Technical Bulletin Board Service

Technical Support E-mail Address

CompuServe

FTP Server

1 [phone] 1 [phone]

([phone] ([phone]

([phone] ([phone]

([phone] ([phone]

([phone] ([phone]

([phone] ([phone]

([phone] ([phone]

([phone] ([phone]

([phone] ([phone]

1 [phone]

[e-mail]

Go ALLIED

Addres s:ftp.alliedtelesyn.com [lowercase letters]
Login: anonymous [lowercase letters]
Password : y our e-mail address [requested by the server at login]

Allied Telesyn International, Corp.

19015 North Creek Parkway
Bothell, WA 98011
Tel: [phone]
Fax: [phone]

World Wide Web:

http://www.alliedtelesyn.com

For Sales or Corporate Information

Allied Telesyn International, Corp.

960 Stewart Drive, Suite B
Sunnyvale, CA 94086
Tel: [phone] (USA and Canada)
Fax: [phone]

25