GarrettCom MAGNUM H80B, MAGNUM H80P Installation And User Manual

GARRETT

GARRETT

Corporate Headquarters:

Garrett Communications

213 Hammond Avenue
Fremont, CA 94539

Phone: [phone]

Fax: [phone]
Email: [e-mail]

Magnum

Personal Hubs

Models H80B and H80P

Installation and User Guide

Magnum H80B and H80P Perso nal Hubs User Guid e (07/9 5)

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Magnum

Personal Hub



Models H80B and H80P

Installation and User Guide

Part #: 84-00037 (07/95)

Trademarks

UL is a registered trademark of Underwriters Laboratories
Ethernet is a trad emark of Xerox Corporation
Velcro is a trademark of Velcro U.S.A.

Personal Hub

and

Magnum

are trademarks of Garrett

Communications, Inc.

Important:

Magnum Personal Hubs contain no user serviceable
parts. Attempted service by unauthorized personnel shall render any
and all warranties null and void. If problems are experienced with a
Magnum Personal Hub, consult Section 5, Troubleshooting, of this
User Guide.

Contacting Gar rett Communications

Please use the mailing address, phone and fax numbers and email
address listed below:

Garrett Communications

213 Hammond Avenue

Fremont, CA 94539

Phone: [phone]

Fax: [phone]

Email: [e-mail]



1995 Garrett Communications, Inc. All rights reserved. No part of this
publication may be reproduced without prior written permission from Garrett
Communications, Inc.

Printed in the United Stat es of America.

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TABLE OF CONTENTS Page

1.0 SPECIFICATIONS........................................................... 1

1.1. Technical Specifications .................................................... 1

1.2 Ordering Information.......................................................... 3

2.0 INTRODUCTION............................................................. 4

2.1 Inspecting the Package and Product.................................... 4

2.2 Product Description ............................................................ 5

2.2.1 Magnum H80B Product Description....................... 6

2.2.2 Magnum H80P Product Description ....................... 8

2.3 Features and Benefits........................................................ 10

2.4 Applications...................................................................... 11

3.0 I

NSTALLATION

.................................................................. 14

3.1 Magnum H80B Installation............................................... 14

3.2 Magnum H80P Installation............................................... 15

3.3 Table-Top or Shelf Mounting .......................................... 15

3.4 Wall (or Vertical Surface) Mounting ................................ 16

3.5 Ethernet Media Connections............................................. 17

3.5.1 Twisted Pair Segment Connections....................... 17

3.5.2 AUI Connections (Model H80P only)................... 18

3.5.3 ThinNet 10BASE2 (BNC) Connections................ 19

3.6 Switchable Up-Link Feature ............................................. 20

3.7 Cascading Personal Hubs with the Up-Link Port.............. 21

4.0 OPERATION.................................................................. 22

4.1 Functional Operation, Use of LED Indicators................... 22

5.0 TROUBLESHOOTING.................................................. 24

5.1 Before Calling for Assistance............................................ 24

5.2 When Calling for Assistance............................................. 25

5.3 Return Material Authorization (RMA) Procedure............. 25

5.4 Shipping and Packaging Information................................ 26

APPENDIX A: W

ARRANTY INFORMATION

.......................... 27

Federal Communications Commission

Radio Frequency Interference Statement

This equipment generates, uses and can radiate frequency
energy and if not installed and used properly, that is in strict accordance
with the manufacturer's instructions, may cause interference to radio
communication. It has been tested and found to comply with the limits
for a Class A computing device in accordance with the specifications in
Subpart J of Part 15 of FCC rules, which are designed to provide
reasonable protection against such interference when operated in a
commercial environment. Operation of this equipment in a residential
area is likely to cause interference, in which case the user at his own
expense will be required to take whatever measures may be required to
correct the interference.

MAGNUM

ETHERNET CONNECTIVITY PRODUCTS

"DESIGNED AND MANUFACTURED IN THE USA"

Overview

Garrett Communications offers the Magnum line of Ethernet LAN
physical layer connectivity products with industry-standard
functionality. Magnum products are available worldwide through
OEMs, integrators, representatives, and international distributors.

Stackable Hubs, SNMP Optional

24-Port 10BASE-T Hub
12-Port 10BASE-T Hubs

Local Bridge with SNMP

Local Bridge, full-featured, self-learning

The "X-line" of configurable MiXed Media products

Stackable Concentrators,

SNMP optional, 13 ports

Mini-Concentrators,

7 ports

Workgroup Bridges,

all media types

Two-Port Repeaters, internal power supply,

all media types

Two-Port Repeaters, external power supply,

all media types

Repeater Port Modules (RPMs),

6 types for all Ethernet media

Bridge Port Modules (BPMs),

4 types for segment isolation

Workgroup Hubs ( the "ten" series)

8-port + AUI or Port Module option
16-port + AUI and Port Module slot
24-port + AUI and Port Module slot

Personal Hubs



9-port and 5-port Personal Hubs, with manual up-link switch
8-port and 4-port + AUI Personal Hubs, w/ man. up-link sw.
8-port + BNC Personal Hub, w/ manual up-link switch
Stackable 8-port +AUI and BNC or Fiber, w/ up-link switch

Media Converters

Two RJ-45 Models, with BNC or Fiber

Fan-Outs

4 and 8 Port Deluxe, 2 and 4 Port Standard Models

Transceivers

Coax and Mini-Transceivers, All Types

July '95

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1.0 SPECIFICATIONS

1.1. Technical Specifications
Performance:

Data Rate: 10 Mbps

Partitioning: Enforced after 32 consecutive collisions.

Reconnect: Occurs after 512 bits error-free transmission.

Maximum Ethe rnet Segme nt Lengths:

10BASE-T (Unshielded twisted pair) - 100 m (328 ft)

10BASE-T (Shielded twisted pair)- 150 m (492 ft)

AUI Drop Cable - 50 m (164 ft)

10BASE2 ThinNet (BNC) - 185 m (607 ft)

Network Standards:

Ethernet V1.0/2.0 IEEE 802.3: 10BASE-T, 10BASE5.

(Magnum Personal Hubs are physical layer standard

Ethernet products, and operate in networks independently

of all software.)

Operating Environment:

Ambient Temperature:32ºF to 122ºF (0ºC to 50ºC)

Storage Temperature:-20ºC to 60ºC

Ambient Relative Humidity:10% to 95% (non-condensing)

Power Supply (External) (H 80B, optional for H80P):

Power Input: 95 - 125 vac at 60 Hz for "-d" Models,

200 - 250 vac at 50 Hz for "-i" Models, which
have IEC power cable connector in the external
power unit.

Power Consumption: 10 watts max

Connectors:

H80B: 8 front-mounted shielded RJ-45 (1 with up-link

switch), 1 rear BNC with internal termination
switch.

H80P: 8 front-mounted shielded RJ-45, 1 rear

DTE (male AUI)

(Shielded 10BASE-T connectors accept either unshielded or
shielded wiring lugs for standard twisted pair media wiring.)

The regular RJ-45 ports support the standard for hubs-to-users twisted pair
wiring: pin 1= receive+, 2 = receive-, 3 = transmit+, 6 = transmit-, other pins
not used. The RJ-45 port with the MDI-X switch is normally the same, but
when switched it supports the standard for up-links using twisted pair wiring,
i.e., the transmit and the receive pairs are exchanged: pin 1 = transmit+, 2 =
transmit-, 3 = receive+, 6 = receive- , other pins not used.

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Switches:

Up-Link: MDI-X (Media Dependent Interface -

Crossover) manual slide switch, converts RJ-45 port #8

from a regular (=) user segment port to a crossover (X)

up-link port for on-off connection to a backbone or another

cascaded hub.

Internal Termination (H80B only): Allows BNC

conneciton without use of "T" connector. Right position --

internal termination, no "T" required. Left position --

external termination via "T" connector required.

Packaging:

Enclosure: Rugged, high strength steel enclosure.

Suitable for vertical or horizontal mounting

(supplied with metal mounting clips, screws,
and a Velcro



strip)

Recessed LEDs to avoid damage.

Dimensions:

H80B, H80P: 4.4in x 5.0in x 0.75in

(11.2cm x 12.7cm x 1.9cm )

Weight:

H80B and H80P: 1.0 lbs (455 gr);

Power Supply: 1.0 lbs (455 gr)

Cooling method:

Convection

Agency Approvals:

115v 60 Hz Power Supply is UL Listed, CSA certified.

230v 50 Hz Power Supply is same, also GS approved.

Emissions: Meets FCC Part 15 Class A

Warranty:

Three years (see also Appendix A) Made in USA

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1.2 Ordering Information

Magnum Personal Hubs

MODEL DESCRIPTION
Magnum H80B-d

Personal Hub with eight standard
RJ-45 ports, one with up-link switch,
plus one BNC port with internal
termination switch, external 115 vac
60 Hz power supply.

Magnum H80A-i

Same as H80B-d, but with external
230 vac 50 Hz power supply.

Magnum H80P

AUI powered Personal Hub with
eight standard RJ-45 ports, one with
up-link switch, plus one rear DTE
(maleAUI) port.

Magnum Personal Hubs Spare Parts

MODEL DESCRIPTION
H80-d-ps

External 115 vac 60 Hz power supply.

H80-i-ps

External 230 vac 50 Hz power supply.

Garrett Communications reserves the right to change specifications,

performancecharacteristics and/or model offerings without notice.

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2.0 INTRODUCTION

This section describes the Magnum H80B and H80P
Personal Hubs, including appearance, features and possible
applications.

2.1 Inspecting the Package and Product

Examine the shipping container for obvious damage prior
to installing this product; notify the carrier of any damage which you
believe occurred during shipment or delivery. Inspect the contents of
this package for any signs of damage and ensure that the items listed
below are included.

This package should contain:
1 Magnum H80B or H80P Personal Hub
1 External Power Supply, either 115v 60 Hz or

230v 50 Hz (

H80B only)

1 Velcro® Tape section, approximately 3 inches in

length
1User Guide
1 Product Registration Card

Remove the Magnum Personal Hub from the shipping
container. Be sure to keep the shipping container should you need to
ship the unit at a later date. To validate the product warranty please
complete and return the enclosed Product Registration Card to
Garrett Communications as soon as possible.

In the event there are items missing or damaged, contact
your supplier. If you need to return the unit, try to use the original
shipping container. Refer to Section 5, Troubleshooting, for specific
return procedures.

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2.2 Product Description

The Magnum H80B and H80P Personal Hubs are nine-port
workplace hubs in a very compact package. They are simple to
install and use in an office or lab environment, requiring no special
rack cabinets or wiring closet apparatus. Personal Hubs are standard
physical layer Ethernet products and operate independently of all
software.

Personal Hubs fit easily into the workplace environment.
They are versatile enough to be table-top or shelf-mounted.
Alternatively, a Velcro strip is included in the package so that the
unit may easily be installed on a wall surface, or on the back or side
of a desk or cabinet. All of the wiring connectors are in the same
plane so that wiring space is neat and minimal. The external power
supply unit (optional for the H80P) conveniently plugs into an AC
wall receptacle or power strip.

The H80B and H80P Personal Hubs' RJ-45 ports support
connection of up eight workstations or other network devices over
full length 10BASE-T cable segments. Personal Hubs operate in
compliance with the IEEE 802.3 specification for repeater
functionality to perform signal amplification, re-timing of data
packets, and regeneration of preamble bits for each packet received.

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Consistent with IEEE 802.3 specifications, Personal Hubs will detect
collisions, extend collision fragments, and automatically partition
and re-connect individual ports in order to keep problems on one
segment from causing downtime elsewhere on the network.

Personal Hubs include LINK and RX LEDs, located on top
of the unit above each RJ-45 port, and one LED for DC power
located at the rear near the external power supply connection. For
observing operational information from the LEDs, it is easy to
associate the status LEDs for each of the ports with the appropriate
port plug.

2.2.1 Magnum H80B Product Descr iption

Magnum H80B Personal Hubs provide a simple and
inexpensive solution for networking a personal multi-system office
using 10BASE-T twisted pair cabling. They are perfect for sites that
have ThinNet installed and need to wire additional office space for
twisted pair.

Magnum H80Bs are also well suited for small- to-medium­size office or lab environments (up to eight persons) that need an
independent Ethernet network. They operate as self-sufficient units

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to provide ThinNet and 10BASE-T Ethernet connectivity for local
users and devices. Small independent networks built using Personal
Hubs are easily expanded by adding hubs of equal or greater capacity
via cascaded connections using the Up-Link switched port feature.
The BNC port of the H80B provides 10BASE2 backbone
connectivity if required.

The H80B's small size makes it very useful for
demonstration situations in conference rooms and in exhibitions
where a temporary network or network expansion is needed. It is
handy as a piece of test equipment that can be easily inserted into a
network to provide a test port, and then removed after the testing is
done. The H80B Personal Hub takes up minimal space, uses
minimal power, and is rugged enough to be carried in a coat pocket
for possible emergencies.

The external power supply unit supplied with the H80B is
one of two types; one version for AC input power of 115 vac 60 Hz,
and one version for 230 vac 50 Hz. The 115 vac version has a small
transformer integral with a convenience power outlet plug. The 230
vac version has a small transformer integral with an IEC-type power
plug for a user-supplied AC power cord with a convenience power
outlet plug. Both types include a lightweight DC power cord for
connection to the Personal Hub's power jack.

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2.2.2 Magnum H80P Product Descri ption

Magnum H80P Personal Hubs provide a simple and
inexpensive solution for expanding a single AUI port into an eight
port hub. Since the H80P receives power through its DTE (male
AUI) port, it may be installed in virtually any location, without
worrying about access to a power outlet. To the server, router or
other device to which it is connected, the Magnum H80P appears as
a standard transceiver. The rear DTE port of the un i t allows for
direct drop cable connection to any AUI port.

As an option, the H80P may be powered by an external
power suppy (see Spare Part Ordering information, Section 1.3).
When used for redundancy, the external supply retains local
connectivity in the event of a power outage on the AUI segment. In
addition, the external power supply allows the H80P to function as a
standalone unit.

NOTE: Since the Magnum H80P receives its power from

the rear DTE port, this port must be connected to the AUI

port of another Ethernet device to allow the H80P to

operate, unless the opitonal external power supply is used.

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The H80P's small size makes it very useful for situations
where a temporary twisted pair network is needed, and only AUI
ports are available. It is handy as a piece of test equipment that can
be easily inserted into an AUI backbone to provide a test port, and
then removed after the testing is done. The H80P Personal Hub
takes up minimal space, uses minimal power, and is rugged enough
to be carried in a coat pocket for possible emergencies.

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2.3 Features and Benefits

■■■■ Interconnect to an Existing Ethernet Network

Personal Hubs provide a manual Up-Link switch that

allows one RJ-45 port to be to connect into an existing

Ethernet environment (such as the central hub for the

building or area) via 10BASE-T wiring.

■■■■ Inter-operable with other Ethernet Devices

Personal Hubs are completely inter-operable with other

Ethernet-compliant network devices. Each is fully

compliant with IEEE 802.3 specifications for 10 Mbps

CSMA/CD operation. This allows Personal Hubs to be

integrated within any standard Ethernet network and to

operate with standard software.

■■■■ Installation Versatility

Personal Hubs are simple and easy to install in most any

office or lab locati on. The tiny package is very

unobtrusive and is typically mounted with Velcro.

■■■■ Robust Network Operations

Personal Hubs use the "star" network topology and have

automatic per-port partitioning and re-connection. A fault

on one segment is isolated from the rest of the network,

avoiding most network downtime.

■■■■ LEDs Simplify Network Installation and Maintenance

Personal Hubs are equipped with a full complement of

LEDs to provide status about basic network activity.

LINK LEDs for each port offer a si mple way for

operational connections of each 10BASE-T segment to be

verified.

■■■■ Low cost, stand-alone 10BASE-T connectivity

Operating in a stand-alone envi ronment as a self-sufficient

device, Personal Hubs offer a very low cost method of

providing small workgroups access to a variety of Ethernet

networking services such as file sharing, E-Mail, printer

sharing, and other computer information.

■■■■ High Quality

Personal Hubs have a rugged steel case and are compliant

with rigid Class CE emission standards, making them

suitable for commercial and home offices.

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2.4 Applications

Magnum H80P and H80B Personal Hubs make expansion
from one to multiple ports at an existing site easy, and do not require
modification to typical building wiring.

Installation of the AUI powered H80P is a simple matter of
connecting the rear DTE port to a standard AUI port (normally with
an AUI drop cable), instantly creating eight twisted pair user ports
from a single AUI port.

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The Magnum H80B offers a simple means of creating a
small workgroup network from a single BNC port. The installer
simply connects the existing BNC tap to the BNC port of the H80B
with a standard ThinNet (10BASE2) segment. By using the internal
termination of the H80B, no "tee" conector is required (unless the
segment must extend beyond the H80B unit). Then, power is
connected by plugging the external power supply unit into an AC
power receptacle, and plugging the DC p ower plug into the jack on
the back of the Personal Hub. In minutes, eight twisted pair ports are
available for other networked devices.

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The H80B Personal Hub may also be used as a stand-alone
network for a local multi-user system such as shown in the figure.
The BNC port is used to support devices connected via ThinNet,
while the RJ-45 ports support up to eight user devices connected via
twisted pair. Full-length Ethernet segments are supported on all
segments. In this application, the "Up-Link" switch is in the straight­through or = position so that the switchable up-link port is a user
port, not an up-link to another hub.

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3.0 Installation

This section describes the installation of Magnum H80B
and H80P Personal Hubs, including mounting options and cable
connections.

3.1 Magnum H80B Installation

The installation of a Magnum H80B Personal Hub is a very
simple procedure. Locate an AC receptacle that is within six feet (2
meters) of the intended hub location and plug in the external power
supply unit (provided as part of the unit). The small DC power cord
from the power supply plugs into the matching rear power jack of the
Personal Hub, and when power is applied the green "PWR" LED will
be illuminated.

The external power supply unit supplied is one of two
types; one version for AC input power of 115 vac 60 Hz, and one
version for 230 vac 50 Hz. Examine the power supply to make sure
the version you have is the right type for your AC power system.
The 115 vac version has a small transformer integral with a
convenience power outlet plug, and a lightweight DC power cord to
the applicable power jack on the hub. The 230 vac version has a
small transformer integral with an IEC-type power plug for a user­supplied AC power cord with a convenience power outlet plug. It
also includes a lightweight DC power cord to the applicable power
jack on the Personal Hub unit.

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3.2 Magnum H80P Installation

Installation of the Magnum H80P Personal Hub is a simple
procedure. Since the unit receives power from its rear DTE port, it
can be located virtually anywhere. The H80P is typically connected
to another Ethernet device through an AUI drop cable. For AUI
connection instructions, refer to Section 3.5.2.

It is also possible to connect an external power supply
(refer to Spare Part Ordering Information, Section 1.3, for model
names). This is useful in cases where a redundant supply is desired
or the topology of the network has changed and the DTE port is no
longer being used. When using an external power supply, the unit
will still receive its power from the AUI connection as long as the
port is connected and supplying suitable power. Should a power
outage occur on the AUI segment, the external power supply will
continue to supply power, maintaining connectivity amongst local
users. Refer to Section 3.1 for external power supply connection
instructions.

3.3 Table-Top or Shelf Mounting

Personal Hubs are easily mounted on a table-top or shelf,
and have four rubber feet to provide stability without scratching
finished surfaces. A piece of Velcro may be used to add additional

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stability if desired. When properly installed, the top-view LED status
indicators will be in plain view and easy to read. Plug in two or
more Ethernet cable segments, and your network is in operation.

The rugged steel case of the Personal Hub will protect it
from accidental damage in an office or lab workplace setting. Keep
an open area around the unit so that convection cooling can occur
while the unit is in operation.

3.4 Wall (or Vertical Surface) Mounting

A piece of Velcro mounting tape is supplied with the unit,
and may be used to mount a Personal Hub in a vertical position.
Stick one side of the Velcro on the bottom of the hub between the
rubber feet. Stick the other side of the Velcro to the desired vertical
mounting location. This permits the compact Personal Hub to be
mounted on a wall surface, on the side of a server unit cabinet, on the
back of a desk, or in other similar convenient locations in the
workplace where the associated cables are out of the way.

As an alternative to Velcro for vertical surface mounting,
small brackets for mounting with screws may be used. These items
are included i n the package. The metal screws in each si de of the
Personal Hub’s case may be used to attach the brackets. Use of the
optional brackets permits the Personal Hub to be mounted in almost
any desired orientation or position.

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3.5 Ethernet Media Conne c tions

Magnum H80Bs and H80P are equipped with eight
sheilded twisted pair ports and a BNC or DTE (male AUI) port. The
following sections give instructions for installing each of these media
types.

3.5. 1 Twi sted Pair Co nne ctions

1. Using standard
10BASE-T media, insert the
male plug on one end of the
network cable into one of
the RJ-45 female ports on
the Personal Hub. Even
though the hub's plugs are of
the shielded type, they will
accept and operate properly
with both shielded and unshielded type RJ-45 twisted pair wiring.

2. Connect the other end of each network segment to the
applicable workstation or user device. The "LINK" LED will be lit
for each port when the connection is made on both ends of the
segment, and when the DC power is present at each end as well, i.e.,
when the segment circuit is established and is ready to use.

3. For the switched port up-link option, see Section 3.6.

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3.5.2 AUI Connections (Model H80P only)

The Magnum H80P is equipped with a rear DTE (male
AUI) port which serves a dual purpose of supplying power to the unit
and providing backbone connectivity.

NOTE: Since the H80P derives its power from this port,

this connection must be completed before the unit will

function, unless an optional external power supply is

being used..

Before connecting the DTE port of the Magnum H80P,
note that the maximum cable length of an AUI drop cable is 50m
(165 ft).

The Magnum H80P DTE connector supports standard
IEEE signals, summarized in Table 3.5.2.

Table 3.5.2: DTE Pin Assignments

Pin Function Pin Function

1 Control In Circuit Shield 10 Data Out Circuit B
2 Control In Circuit A 11 Data Out Circuit Shield
3 Data Out Circuit A 12 Data In Circuit B
4 Data In Circuit Shield 13 Voltage Plus (+)
5 Data In Circuit A 14 Voltage Shield
6 Voltage Common 15 Control Out Circuit B
7 Control Out Circuit A SHELL Protective Ground
8 Control Out Circuit Shield (conductive shell)
9 Control In Circuit B

NOTES:

1) Voltage Plus (pin #13) and Voltage Common
(pin # 6) use a single twisted pair in the AUI cable.

2) Pins 4, 8, 11 and 14 may be connected to pin #1.

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Using the above information and steps below as a guide,
attach the 10BASE5 drop-cable directly to the DTE connector on the
rear of the H80P.

1. Plug the female end of the cable into the male DTE

connector on the H80P.

2. Engage the AUI connector slide lock (on the cable) to

insure maximum connectivity.

3. Connect the opposite end of the cable into a network

AUI port and engage the port's slide locks.

3.5.3 ThinNet 10BASE2 (BNC) Connections (H80B only)

Connect the ThinNet coax cable to the BNC connector on
the Magnum H80B in the same manner as is done for any standard
BNC connection. The BNC port of the H80B is specially equipped
with an internal termination switch next to the BNC connector. This
eliminates the need to use a "tee" connector when the BNC cable
ends at the connection to the H80B. Some applications may require a
"tee" connector, used as a tap, to allow the 10BASE2 coax segment
to continue on past the H80B unit.

Internal Termination Switch Settings:

Right: Internal termination -- no "T" connector required.
Left: External "T" required.

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3.6 Switchable Up- Link Feature

Each H80B and H80P Personal Hub is equipped with one
MDI-X Up-Link crossover switch, connected to the right-most front
RJ-45 port (port 8). This switch is used to select either a normal
10BASE-T connection to a user device (switch in the "==" position)
or a 10BASE-T network up-link connection to another hub or
concentrator (switch in the "X" position). A special crossover cable
for up-links is not needed with Personal Hubs because of this built-in
up-link switch feature.

When the switchable port is wired for up-link but the
switch is set to the == position, the up-link segment is inoperative
and full bandwidth is available locally.

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3.7 Cascading Personal Hubs with the Up-Link Port

Personal Hubs may be cascaded in order to expand
networks. For example, any Personal Hub may be cascaded via the
switchable up-link port into any port of another hub. Since each
Personal Hub provides full repeater functionality, cascaded units can
operate together even though there may be a full segment of distance
between them.

Based on the "four repeater rule" defined by Ethernet
standards, there may normally be a maximum of four units in any one
chain between any two users.

Magnum Personal Hubs may also be cascaded in networks
with other Magnum Hubs (such as Magnum Workgroup Hubs and
Magnum 3000 Stackable Hubs and Concentrators) as well as with
Ethernet hubs from other manufacturers.

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4.0 OPERATION

This section details the various operational features of
Magnum Personal Hubs, including a description of the LED
indicators. All Personal Hubs are fully compliant with the Ethernet
Version 2/IEEE 802.3 Repeater Specification for CSMA/CD 10
Mbps operation and will function accordingly.

4.1 Functional Operation, Use of LED Indicators
Power On (PWR) LED

: Illuminates GREEN to show functional

DC power.

Link Status (LINK) LED (per port):

Illuminates GREEN when
there is proper connectivity on the port's 10BASE-T network
segment. Each LINK LED will turn off independently in the event
that connectivity is lost between the ends of that segment or a loss of
power occurs in th e segment at either end.

Note: When the switchable port is wired for up-link to another

hub, the LINK LED will normally be on when the up-link
switch is set to the X position. With the up-link switch off
(= position), the LINK LED is off as the up-link is
disabled. This permits local operation of the Personal
Hub with full bandwidth.

Receive Packets (RX) LED (per port):

Illuminates GREEN
intermittently to indicate that data is being received from the
segment. This provides a visual indication of network activity for re­assurance of normal operation, and is helpful in troubleshooting.

Partitioning and Re-connection:

Personal Hubs will automatically
partition any port where 32 consecutive collisions occur or after 6.5
ms of continuous transmissions. Network integrity is checked every
800 ms and segment re-connection occurs after one 512-bit packet is
transmitted without an error.

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Preamble Regeneration

: Personal Hubs add bits to the preamble so
that the output packet contains a minimum 64-bit preamble per the
Ethernet standard.

Collisions:

When carrier is detected simultaneously on multiple
ports, a jam pattern is generated on each port to create a collision
condition. When a collision signal from one port is detected, it
generates a jam pattern to other ports.

Fragment Ex tension:

Personal Hubs will automatically add bits to a
received data packet o f less than 96 bit s (a "fragment") so t hat the
forwarded packet is 96 bits long.

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5.0 TROUBLESHOOTING

All Magnum Ethernet products are designed to provide
reliability and consistently high performance in all network
environments. The installation of Personal Hubs is a simple
procedure (see Section 3.0, INSTALLATION); operation is very
simple and is described in Section 4.0, OPERATION.

Should problems develop during installation or operation,
this section should help to locate, identify and correct such problems.
Please follow the suggestions listed below prior to contacting your
supplier. However, if you are unsure of any procedure described in
this section, or if the Magnum Personal Hub is not operating as
expected, do not attempt to repair or alter the unit. Contact your
supplier (or if unknown, contact Garrett Communications) for
assistance.

5.1 Before Calling for Assistance

1. If difficulty is encountered when installing or operating the
Personal Hub, refer back to Section 3.0, Installation and Section 4.0,
Operation. Check to make sure that the various other components of
the network are operable.

2. Check the cables and connectors to ensure that they are of
the RJ-45 type (not RJ-11 “telephone” type), have been properly
connected, and the cables/wires have not been crimped or in some
way impaired during installation.

3. Make sure that the DC power cord is properly attached to
the unit, and that the external power supply unit is plugged into a
functioning electrical outlet. Use the PWR LEDs to verify the unit is
receiving proper power.

4. If the problem is isolated to a network device other than the
Magnum Personal Hub, it is recommended that the problem device
be replaced with a known good device. Verify whether or not the
problem is corrected. If not, go to Step 5 below. If the problem is
corrected, the Personal Hub and its associated cables are functioning
properly.

5. If the problem continues after completing Step 4 above,
contact your supplier of the Personal Hub unit (or if unknown,
contact Garrett Communications) by fax, phone or email for
assistance.

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5.2 When Calling for Assistance

Please be prepared to provide the following information.

1. A complete description of the problem, including the

following points:

a. The nature and duration of the problem;
b. Situations when the problem occurs;
c. The components involved in the problem;
d. Any particular application that, when used, appears to

create the problem;

2. An accurate list of Garrett Communications product

model(s) involved, with serial number(s). Include the date(s) that
you purchased the products from your supplier.

3. It is useful to include other network equipment models and

related hardware, including personal computers, workstations,
terminals and printers; plus, the various network media types
being used.

4. A record of changes that have been made to your network

configuration prior to the occurrence of the problem. Any changes
to system administration procedures should all be noted in this
record.

5.3 Return Material Aut hor ization (RMA) Procedure

All returns for repair must be accompanied by a Return
Material Authorization (RMA) number. To obtain an RMA number,
contact Garrett Communications Customer Support at (510) 438­9071 (office hours: 8AM - 5PM Pacific Standard Time) or send
email to

[e-mail]

. Please have the following

information available when calling:

Name and phone number of your contact person.

Name of your company / institution

Your shipping address

Product name

Serial Number (or Invoice Number)

Packing List Number (or Sales Order Number)

Date of installation

Failure symptoms, including a full description of the

problem.

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Garrett Communications will carefully test and evaluate all

returned products, will repair products that are under warranty at
no charge, and will return the warranty-repaired units to the sender
with shipping charges prepaid (see Warranty Information,
Appendix A, for complete details). However, if the problem or
condition causing the return cannot be duplicated by Garrett
Communications, the unit will be returned as:

No Problem Found.

Garrett Communications reserves the right to charge for the

testing of non-defective units under warranty. Testing and repair
of product that is not under warranty will result in a customer
(user) charge.

5.4 Shipping and Packaging I nformation

Should you need to ship the unit back to Garrett

Communications, please follow these instructions:

1. Package the unit carefully. It is recommended that you
use the original container if available. Units should be wrapped
in a "bubble-wrap" plastic sheet or bag for shipping
protection. ( You may retain all connectors and this

Installation Guide.)

CAUTION

Do not pack the unit in Styrofoam "popcorn" type packing

material. This material may cause electro-static shock damage

to the unit.

2. Clearly mark the Return Material Authorization (RMA)
number on the outside of the shipping container.

3. Garrett Communications is not responsible for your
return shipping charges.

4. Ship the package to:

Garrett Communications
213 Hammond Avenue
Fremont, CA 94539
Attn.: Customer Service

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APPENDIX A: Warranty Information

Garrett Communications warrants its products to be free
from defects in materials and workmanship for a period of three (3)
years from the date of shipment by Garrett Communications.

During this warranty period, Garrett Communications will
repair or, at its option, replace components in the products that prove
to be defective at no charge other than shipping and handling,
provided that the product is returned pre-paid to Garrett
Communications.

This warranty will not be effective if, in the opinion of
Garrett Communications, the product has been damaged by misuse,
misapplication, or as a result of service or modification other than by
Garrett Communications.

Garrett Communications reserves the right to make a
charge for handling and inspecting any product returned for warranty
repair which turns out not to be faulty.

Please complete the warranty card as this acts as a product
registration, and mail it to Garrett Communications within two weeks
of your purchase.