GarrettCom Magnum ST80 Stackable User manual

www GarrettCom com .. www GarrettCom com ..
Corporate Headquarters
GarrettCom, Inc.
47823 Westinghouse Dr.
Fremont, CA 94539
Phone [phone]
Fax [phone]
Website: http://www.GarrettCom.com
email [e-mail]
Magnum ST80 Stackable
Personal Hub
Installation and User Guide
$5.00 USD

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MagnumStackable
Personal Hub 
Installation and User Guide
Part #: 84-00029 (Rev B 04/01)
Trademarks
Ethernet is a trademark of Xerox Corporation
NEBS is a trademark of Telcordia Technologies
UL is a registered trademark of Underwriters Laboratories
GarrettCom, Magnum and Personal Switch are trademarks and Personal Hub is a
registered trademark of GarrettCom, Inc.
Important: The Magnum ST80 Stackable Personal Hub family contains no
user serviceable parts. Attempted service by unauthorized personnel shall
render all warranties null and void. If problems are experienced with
Magnum ST80 Stackable Personal Hub products, consult Section 6,
Troubleshooting, of this User Guide.
Copyright 2001 GarrettCom, Inc. All rights reserved. No part
of this publication may be reproduced without prior written permission from
GarrettCom, Inc.
Printed in the United States of America.

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Contacting GarrettCom, Inc
Please use the mailing address, phone and fax numbers and email address listed below:
GarrettCom, Inc.
47823 Westinghouse Dr.
Fremont, CA 94539
Phone [phone]
Fax [phone]
Website: http://www.GarrettCom.com
email [email protected]
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.

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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
2.3 Features and Benefits........................................................................................ 8
2.4 Applications...................................................................................................... 9
3.0 INSTALLATION ............................................................................................ 11
3.1 Table-Top or Shelf Mounting........................................................................ 11
3.2 Wall (or Vertical Surface) Mounting (for non-stacked units only)................. 12
3.3 Combining and Mounting Stacked Units........................................................ 12
3.4 Twisted Pair Segment Connections ................................................................ 13
3.5 AUI Connection.............................................................................................. 13
3.6 BNC Connection (Model ST80-B only)......................................................... 15
3.7 Fiber Optic Connection (Model ST80-F only)................................................ 15
3.8 Switchable Up-Link Option............................................................................ 16
3.9 Stacking the ST80 Personal Hubs................................................................... 16
3.10 Cascading ST80 Personal Hubs with the Up-Link port ................................ 18
4.0 OPERATION............................................................................................. 19
4.1 Functional Operation, Use of LED Indicators ................................................ 19
4.2 Using the Up-Link switch............................................................................... 20
4.3 Using the BNC internal termination switch (Model ST80-B only) ................ 20
4.4 Using the Stack Enable switch........................................................................ 21
5.0 TROUBLESHOOTING............................................................................. 22
5.1 Before Calling for Assistance......................................................................... 22
5.2 When Calling for Assistance .......................................................................... 23
5.3 Return Material Authorization (RMA) Procedure .......................................... 23
5.4 Return Shipping and Packaging Information.................................................. 24
APPENDIX A: WARRANTY INFORMATION .................................................... 24
Revisions
Rev B 04/01 : Change the company name to GarrettCom, Inc. (Formerly it
was Garrett Communications). There are no changes to the content of the
material at this time
Rev A 06/95 : This revision is the initial release of the Magnum ST80 Stackable
Personal Hub user manual.

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The Magnum Line
ETHERNET CONNECTIVITY PRODUCTS
"DESIGNED AND MANUFACTURED IN THE USA"
OVERVIEW
GarrettCom, Inc.offers the premium-quality Magnumline of Ethernet LAN
connectivity products with industry-standard functionality and built-in fiber
configurability. Magnum products are designed for use in demanding Carrier Class,
Industrial Grade and OEM applications where reliability is a primary consideration.
4K-Series Switches, 100 & 10Mbps, copper ports with optional fiber
port, with auto-negotiating full switching performance
Quad-Series Fiber Switches, 100 & 10Mbps, fiber and copper
ports, mixed-speed and mixed-media types, full switching
performance
“Outdoor” Ethernet Switch, for temperature uncontrolled locations
6 10/100 and 2 100Mb fiber ports, can be connected in strings
Mixed-Media Fiber Hub, 16-port Stackable, 10/100 auto-sensing
Dual Speed 8-port and 16-port Stackables, 10/100 auto-sensing
Stackable Hubs, SNMP Optional
10Mb series and 100Mb series, both w/ optional port modules
Personal Switches, 10/100Mb
8 port dual speed, Auto-negotiable with fiber option
Personal Hubs, 100Mb or 10/100Mb
8-port, with two switched ports (1 fiber built in)
Personal Hubs, 10Mb series
8-port + AUI, stackable to 5 high, + optional BNC of fiber port
8 or 9-port and 4 or 5-Port Personal Hubs, w/ man. up-link sw.
Media Converters, 10Mb and 100Mb series
All media combinations, incl. fiber ST, SC, mm., single mode
The “X-line” of configurable MiXed Media products:
Stackable Concentrators, SNMP optional, 13-Ports
Mini-Concentrators, 7 Ports, Repeaters, 2-Ports
Repeater Port Modules (RPMs),6 types for Ethernet media
Bridge Port Modules (BPMs), 4 types, for segment isolation
Fan-Outs, 10Mb series
2, 4 and 8 Port Models
Transceivers, 10Mb and 100Mb series 10Mb Mini-Transceivers
and Coax Models, All Types - Apr, 01

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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 Ethernet Segment Lengths:
10BASE-T (Unshielded twisted pair) - 100 m (328 ft)
10BASE-T (Shielded twisted pair)- 150m (492 ft)
AUI Drop Cable - 50 m (164 ft)
10BASE2 ThinNet (BNC) - 185 m (607 ft)
10BASE5 - 500 m (1,640 ft)
10BASE-FL multi-mode Fiber optic - 2 km (6562 ft)
Network Standards:
Ethernet V1.0/2.0 IEEE 802.3: 10BASE-T, 10BASE5, 10BASE2,
10BASE-FL, FOIRL.
(Magnum Stackable 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):
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.
Output: 12 VDC, 1 A
Polarity: center positive, shell negative
Power Consumption: 12 watts max.
Connectors:
ST80: Eight shielded RJ-45 ports (one with up-link switch); one rear AUI,
female, with slide lock; two Inter-Repeater-Bus connectors on the side.
ST80-B: Same as ST80, plus one rear BNC with internal termination switch.
ST80-F: Same as ST80, plus one rear Fiber ST-type.
(Shielded 10BASE-T connectors accept either unshielded or shielded wiring
plugs 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 up-link 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.
Stack Enable Switch: Manual slide switch to specify which Stackable
Personal Hub is the base of the stack. Exactly one hub should have its Stack
Enable switch in the “OFF” position (left). All other hubs in the stack should
have their Stack Enable switches set to the “ON” position (right).
Internal Termination Switch (ST80-B only): When switched to the right
position, allows BNC connection without a “tee” connector and a 50 ohm
terminator. When switched to left position, a “tee” connector is required.
LEDs:
PWR: GREEN when Proper DC power supplied to ST80.
COL: YELLOW when a transmit collision occurs on the hub.
LINK/TX (per port): GREEN when link established on port. Flickers as
port transmits packets.
POL/RX (per port): Flickers GREEN as port receives packets. Steady
GREEN when reversed polarity detected.
Packaging:
Enclosure: Rugged, high strength steel enclosure.
Suitable for vertical or horizontal mounting.
Any unit may be used stand-alone, or as either the base unit or an additional
unit in a stack (two stacking / mounting clips and one IRB cable are
included with each unit)
Recessed LEDs to avoid damage, located with the RJ-45 ports for convenience.
Dimensions:
All models: 6.75 in x 4.0 in x 1.0 in (17.1 cm x 10.1 cm x 2.5 cm)
Weight:
All models: 1.3 lb. (600 gr.)
Power Supply: 1.0 lb. (455 gr.)
Cooling method:
Convection
Agency Approvals:
Magnum ST80 is UL Listed (UL1950), CSA certified
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 Stackable Personal Hubs
MODEL DESCRIPTION
Magnum ST80-d Stackable Personal Hub with eight standard RJ-45 ports, one
with up-link switch, plus one rear AUI port; external 115 vac
60 Hz power supply.
Magnum ST80-i Same as ST80-d, but with external 230 vac 50 Hz power
supply.
Magnum ST80-B-d Stackable Personal Hub with eight standard RJ-45 ports, one
with up-link switch; one AUI plus 1 BNC port with internal
termination switch; external 115 vac 60 Hz power supply.
Magnum ST80-B-i Same as ST80-B-d except with external 230 vac 50 Hz
power supply.
Magnum ST80-F-d Stackable Personal Hub with eight standard RJ-45 ports, one
with up-link switch; one AUI plus one Fiber-ST port with
LINK LED; external 115 vac 60 Hz power supply.
Magnum ST80-F-i Same as ST80-F-d except with external 230 vac 50 Hz
power supply.
GarrettCom, Inc. reserves the right to change specifications, performance
characteristics and/or model offerings without notice.

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2.0 INTRODUCTION
This section describes the ST80 Stackable Personal Hub, 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 ST80-series Stackable Personal Hub
1 External Power Supply, either 115v 60 Hz or 230v 50 Hz
1 Velcro® Tape section, approximately 3 inches in length
2 L-shaped stacking /mounting brackets
4 Metal screws for optional use with stacking/mounting brackets
1 Installation and User Guide
1 Product Registration Card
Remove the Magnum Stackable 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 GarrettCom, Inc. 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 Stackable Personal Hub is an eight-port + workplace hub in a very
compact package. It is simple to install and use in an office or lab environment,
requiring no special rack cabinets or wiring closet apparatus. Up to five Stackable
Personal Hubs may be stacked to form a single logical repeater. Personal Hubs are
standard physical layer Ethernet products and operate independently of all software.
ST80 Personal Hubs are well suited for small- to-medium-size office or lab
environments (up to eight users without stacking) that need an independent Ethernet
network. They can operate as self-sufficient units to provide 10BASE-T Ethernet
connectivity for local users and devices. Small independent networks built using
Stackable Personal Hubs are easily expanded by stacking additional ST80s via the IRB
connectors. The AUI port provides backbone or other connectivity if required. (The
ST80-B and ST80-F models are also equipped with a BNC or a Fiber-ST connector for
convenient media connections.)
Stackable Personal Hubs provide a simple and inexpensive solution for
networking a multi-system office using 10BASE-T twisted pair cabling. They can
expand an existing single-network-port outlet to provide up to seven additional RJ-45
ports in the immediate office or lab area. Once installed, a Stackable Personal Hub is
easily expanded by stacking additional units to support larger numbers of users.
The Magnum ST80s’ small size makes them very useful for demonstration
situations in conference rooms and in exhibitions where a temporary network or network
expansion is needed. They are 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.
Stackable Personal Hubs take up minimal space, use minimal power, and are rugged
enough to be carried in a coat pocket for possible emergencies.
Magnum ST80 Stackable Personal Hub
Ports 1 2 3 4 5 6 7 8
PWR AUI
IRB1IRB2
Stack Enable
OFF ON
UP-LINK
Network
Port

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ST80 Personal Hubs fit easily into the workplace environment. They are
versatile enough to be table-top or shelf-mounted. Alternatively, the brackets included in
the package may be used to mount a single (un-stacked) unit on a wall or any suitable
vertical surface. All of the wiring connectors are in the same plane so that wiring space is
neat and minimal. The external power supply unit conveniently plugs into an AC wall
receptacle or power strip.
The ST80's RJ-45 ports support connection of up to eight workstations or other
network devices over full length 10BASE-T cable segments. Stackable 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. Consistent with IEEE 802.3 specifications, Stackable 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.
Model ST80 Personal Hubs include per port LINK/TX and POL/RX LEDs, a
COLlision LED and a DC PWR LED, all conveniently located on the front of the unit.
The LINK/TX LED illuminates GREEN when functional link is detected on the port. It
is intermittently turned off as the port transmits a packet. The POL/RX LED
intermittently illuminates GREEN as the port receives packets. If improper polarity is
detected, the LED is steady GREEN (the ST80 automatically compensates for the
polarity reversal and resumes normal operation). If the port becomes partitioned, the
LINK/RX and POL/TX LEDs will blink alternately. The COL LED flashes YELLOW
whenever a transmit collision occurs on any of the ports.
Magnum ST80 Stackable Personal Hub
Ports 1 2 3 4 5 6 7 8
PWR AUI
IRB1IRB2
Stack Enable
OFF ON
UP-LINK
Front PortsStatus LEDs Switchable
Up-Link Port
Up-Link Switch
Stack Enable
Switch
IRB
Connectors
AUI Port
Power Jack
10BASE2 (BNC) Port (ST80-B only)
Fiber (ST) PORT (ST80-F only)
BNC Internal
Termination Swtich
(ST80-B only)

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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. 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 also include
a lightweight DC power cord to the applicable power jack on the ST80 unit.

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2.3 Features and Benefits
Expandable Design
When network needs grow, several Stackable Personal Hubs can be easily
stacked to form a single logical repeater of up to forty RJ-45 ports.
Low cost, stand-alone 10BASE-T connectivity
Operating in a stand-alone environment as self-sufficient devices,
Stackable 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.
Interconnect to an Existing Ethernet Network
Stackable Personal Hubs provide a manual Up-Link switch that allows one
RJ-45 port 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
Stackable 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, and can be integrated within
any standard Ethernet network and operate with standard software.
Installation Versatility
Stackable Personal Hubs are easy to install in most any office or lab location.
The tiny package is very unobtrusive and may even be Velcro mounted.
LEDs Simplify Network Installation and Maintenance
Stackable Personal Hubs are equipped with a full complement of LEDs to
provide status about basic network activity. LINK LEDs for each port offer a
simple way to verify operational connections of each 10BASE-T segment.
High Quality
Stackable Personal Hubs have a rugged steel case and are compliant with rigid
CE emission standards, making them suitable for commercial and home
offices. Per-port partitioning and re-connection avoids most downtime.

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2.4 Applications
Expanding from one to multiple ports at an existing site is easy, and requires
no modification to typical building wiring. Simply plug the existing networked device's
network cable into one of the ST80’s front RJ-45 ports. The Up-Link port (with switch
set to “X”) connects via 10BASE-T cabling to the existing network outlet. Optionally, a
mini-transceiver may be connected to the rear-mounted AUI port to provide connectivity
to any standard Ethernet media type. (The ST80-B and ST80-F provide for direct
connection to 10BASE2 and multi-mode Fiber respectively).
Power is connected by plugging the external power supply unit into an AC
power receptacle, and plugging the DC power plug into the jack on the back of the ST80.
In minutes, up to eight additional ports are available for other networked devices.
Magnum ST80 Stackable Personal Hub
Ports 1 2 3 4 5 6 7 8
PWR AUI
IRB1IRB2
StackEnable
OFF ON
UP-LINK
Personal Workgroup
...to existing network via
switchable Up-Link port.
Port 8 Switchable
Up-Link set to “X”
Magnum ST80 Stackable Personal Hub
Ports 1 2 3 4 5 6 7 8
PWR AUI
IRB1IRB2
StackEnable
OFF ON
UP-LINK
Personal Workgroup
...to existing network via AUI,
BNC (ST80-B only), or Fiber ST
(ST80-F only) connector.
Port 8 Switchable
Up-Link set to “==”

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Stackable Personal
Hubs may also be used as a
stand-alone network for a
personal multi-user system
such as shown below. Up to
eight RJ-45 user ports are
available where only 10BASE-T wiring is used, and full-length Ethernet segments are
supported on all ports. In this application, the Up-Link switch is in the straight-through or
“==” position so that port 8 is a user port, not an up-link to another hub.
When network requirements exceed the capacity of a single ST80, additional
hubs may be stacked to form a single logical hub. This stacking capability allows one to
build larger networks that are in compliance with the “four repeater rule” specified in the
Ethernet standards. As with a single ST80 unit, a stack may be connected to a backbone
through any standard Ethernet media. A stack of ST80s may also be cascaded as a unit
into another stack or hub.
Magnum ST80 Stackable Personal Hub
Ports 1 2 3 4 5 6 7 8
PWR AUI
IRB1IRB2
Stack E nable
OFF ON
UP-LINK
Personal Workgroup
Port 8 Switchable
Up-Link set to “==”
Rear port(s) may be used
for additional user(s).
Magnum ST80 Stackable Personal Hub
Ports 1 2 3 4 5 6 7 8
PWR AUI
IRB1IRB2
StackEnable
OFF ON
UP-LINK
Fiber backbone
connection
Up-Link
set to “X”
Magnum ST80 Stackable Personal Hub
Ports 1 2 3 4 5 6 7 8
PWR AUI
IRB1IRB2 StackEnable
OFF ON
UP-LINK

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3.0 Installation
Installation of a Stackable Personal Hub is a simple procedure. First, 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 ST80, and when
power is applied
the green PWR
LED will
illuminate.
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
user-supplied AC power cord with a convenience power outlet plug. It also includes a
lightweight DC power cord to the applicable power jack on the ST80 unit.
3.1 Table-Top or Shelf Mounting
Stackable Personal Hubs are easily mounted on a table-top or shelf, and have
four rubber feet to provide stability without scratching finished surfaces. When properly
installed, the front-mounted status LEDs will be in plain view and easy to read. Plug in
two or more Ethernet cable segments, and the network is in operation.
External
Power Supply
Power Jack
Magnum ST80 Stackable Personal Hub
Ports 1 2 3 4 5 6 7 8
PWR AUI
IRB1IRB2
Stack Enable
OFF ON
UP-LINK
AUI Port Power Jack
Rear View - ST80
Power Jack
AUI Port 10BASE2 Port
Rear View - ST80-B
Termination Switch
AUI Port Power Jack
Fiber ST Port
Rear View - ST80-F

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The rugged steel case of the ST80 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.
3.2 Wall (or Vertical Surface) Mounting (for non-stacked units only)
When the Stackable Personal
Hub is being used as a single unit, the
stacking/mounting brackets may be used to
mount the unit on a wall or any
convenient surface where the associated
cables are out of the way. The brackets
are attached to each side of the ST80’s case using one of the metal screws for each
bracket. The brackets should be
attached to the ST80 through the round
hole of the bracket. When properly
attached, the brackets will extend
slightly below the base of the unit to
allow clearance for the rubber feet.
3.3 Combining and Mounting Stacked Units
When stacking two or more ST80s, the stacking/mounting brackets should be
used to attach each additional unit to the one below it. First, attach two brackets to the
bottom of the upper unit, using two of the metal screws. To ease installation, attach the
brackets to the bottom of each unit
through the round holes of the
brackets. The brackets should be
oriented so that they extend down
and out when the unit is upright.
Next, set the upper unit on top of the lower unit, so that the slotted holes of the
two brackets line up with the screw holes in the side of the lower ST80. Attach the
brackets to the lower unit with the two remaining screws. If additional units are to be
Proper attachment of stacking/
mounting bracket for wall mounting
Magnum ST80 Stackable
Personal Hub
+
-AUIPWR
IRB1 IRB2Stack Enable
OFF | ON
Ports 1 2 3 4 5 6 7 8
UP LINK
Top view - One non-stacked ST80 with
brackets attached for wall mounting
Upside-down view - ST80 with
brackets attached for stacking

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included in the stack, attach them in the same manner. (The brackets and screws
included with the bottom unit of the stack will
not be used for stacking purposes.)
3.4 Twisted Pair Segment Connections
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
Stackable Personal Hub. Even though the hub's
ports 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 wiring cable to the applicable
workstation or user device. The port’s
LINK LED illuminates when the
connection is made on both ends of the
wire, and when the DC power is on at
each end, i.e., when the segment
circuit is established and is ready to use.
3. For the port 8 up-link feature, see 3.8.
3.5 AUI Connection
Using the steps below as a guide, attach a new or existing 10BASE5 ThickNet drop-
cable directly to the AUI connector on the rear of the ST80 Personal Hub.
1. Plug the male end of the cable into the female AUI connector on the ST80.
2. Engage the AUI connector slide lock to insure maximum connectivity.
3. Connect the opposite end of the cable into a network AUI port. (This could be a
network backbone transceiver, a hub or fan-out with an AUI port, or an AUI Port Module in
a concentrator.)
Proper attachment of ST80s with
stacking/mounting bracket
RJ-45 User Connections
Magnum ST80 Stackable Personal Hub
Ports 1 2 3 4 5 6 7 8
PWR AUI
IRB1IRB2
Stack Enable
OFF ON
UP-LINK

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The AUI port may also used for connecting to other Ethernet devices using
standard AUI cabling. In this type of situation, it is important to consider the AUI segment
length to the attached device, including any cascading.
The maximum transmission distance between a backbone transceiver and the AUI
port of the ST80 will vary. According to Ethernet standards, when an AUI cable is used to
connect the ST80 directly to a backbone transceiver, the maximum AUI segment length of
50m (165 ft.) is allowed. If the ST80 is connected to a transceiver that has been cascaded
from another transceiver, the maximum AUI segment length is reduced. See the following
note.
Important Note: The maximum transmission distance is decreased by 6m (20
ft.) for every additional level of network transceiver device "dropped" or
"cascaded" from the original backbone transceiver tap.
The AUI connector of the Stackable Personal Hub supports standard IEEE signals,
which are summarized in Table 3.5
Table 3.5 AUI 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.

Stackable Personal Hubs Installation and User Guide (04/01)
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3.6 BNC Connection (Model ST80-B only)
Connect the ThinNet coax cable to the BNC connector on the rear of the ST80-B in
the same manner as is done for any standard BNC connection. The BNC port is specially
equipped with an internal termination switch that eliminates the need to use a "tee" connector
when the BNC cable is ending at the ST-80. When the switch is in the right position, the
connection is internally terminated. When switched to the left position, external termination
(“tee” connector, not supplied) is required. Some applications may require a "tee" connector,
used as a tap, to allow the 10BASE2 coax segment to continue on past the ST-80 port
connection.
3.7 Fiber Optic Connection (Model ST80-F only)
The following procedure applies to FOIRL and 10BASE-FL multi-mode applications
using an ST80-F. (The primary difference between FOIRL and 10BASE-FL for users is the
maximum distance allowed. 10BASE-FL is used for a fiber segment length of up to 2000m,
while FOIRL is used for fiber segments of up to 1000m in length.)
1. Before connecting the fiber optic cable, remove the protective dust caps from the
tips of the connectors on the ST80’s rear Fiber port. Save these dust caps for future use.
2. Wipe clean the ends of the dual connectors with a soft cloth or lint-free lens tissue
dampened in alcohol. Make certain the connectors are clean before connecting.
Note: One strand of the duplex fiber optic cable is coded using color bands at
regular intervals; you must use the color-coded strand on the associated ports at
each end of the fiber optic segment, i.e., TX on one end and RX on the other end.
3. Connect the Transmit (TX) port (light colored post) of the ST80 to the Receive
(RX) port of the remote device. Use the color-coded strand of the cable for this first TX-to-
RX connection.
4. Connect the Receive (RX) port (dark colored post) of the ST80 to the Transmit
(TX) port of the remote device. Use the non-color coded fiber strand for this connection.
5. The LINK LED next to the rear fiber port will illuminate when a proper connection
has been established at both ends (and when power is ON in the unit). If LINK is not lit after
cable connection, the normal cause is improper cable polarity. Swap the fiber cables at the
ST80’s rear fiber port connectors to remedy this situation in most cases.