GarrettCom Magnum DS80 User manual

GARRETT GARRETT
Corporate Headquarters
Garrett Communications
48531 Warm Springs Blvd.
Fremont, CA 94539
Phone: [phone]
Fax: [phone]
WWW: garrettcom.com
email: [email protected]
Magnum DS80
10 / 100 Dual-Speed Personal
Hub
Installation and User Guide

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
i
Magnum DS80
10/100 Dual-Speed
Personal Hub
Installation and User Guide
Part #: 84-00062
Trademarks
UL is a registered trademark of Underwriters Laboratories
Ethernet is a trademark of Xerox Corporation
Velcro is a trademark of Velcro U.S.A.
UL is a registered trademark of Underwriters Laboratories
Magnum is a trademark and Personal Hub is a registered trademark of
Garrett Communications, Inc.
Important: Magnum DS80 Dual-Speed Hub 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 DS80,
consult Section 5, Troubleshooting, of this User Guide.
1998 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 States of America.

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
ii
Contacting Garrett Communications
Please use the mailing address and phone and fax numbers listed below:
Garrett Communications
48531 Warm Springs Blvd.
Fremont, CA 94539
Phone: [phone]
Fax: [phone]
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.

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
iii
The Magnum Line
ETHERNET CONNECTIVITY PRODUCTS
"DESIGNED AND MANUFACTURED IN THE USA"
Overview
Garrett Communications offers the Magnumline of Ethernet LAN connectivity
products with industry-standard functionality. Magnum products are available
worldwide through OEMs, network integrators, representatives, and international
distributors.
Dual-Speed 8-port, 16-port Stackables, 10/100 auto-sensing/port
Fiber Hub, Dual-speed Mixed-Media, for fiber-to-the desktop
Stackable Hubs, SNMP Optional
10Mb series & 100Mb series, both with optional port modules
Switching Hubs, unmanaged 500-series and managed 5000-series
Two-Port Switches
100Mb RJ-45 port +10 /100Mb port, or +FDX fiber port
Workgroup Hubs
10Mb series & 100Mb series, both with optional port modules
Personal Hubs, 100Mb series
8-port dual-speed, 6-port @100 with one switched 10/100Mb
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, including multi-mode and single-mode fiber
10 Mb, all media combinations, incl. Fiber / twisted pair / BNC
100Mb, all fiber port types: SC, ST, MTRJ, VF45, FX / SX
The “X-line” of configurable MiXed Media 10Mb 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
Workgroup Bridges, 10Mb series
Fan-Outs, 10Mb series
4 and 8 Port Deluxe, 2 and 4 Port Standard Models
Transceivers, 10Mb series
Coax Models, All Types
Mini-Transceivers, All Types Nov 98

Magnum DS80 Dual-speed Stackable Hubs Installation and User Guide (11/98)
GARRETT
1
TABLE OF CONTENTS PAGE
1.0 SPECIFICATIONS.................................................................................... 2
1.1 Technical Specifications.................................................................................2
1.2 Ordering Information......................................................................................4
2.0 INTRODUCTION ..................................................................................... 5
2.1 Inspecting the Package and Product................................................................5
2.2 Product Description.......................................................................................6
2.2.1 Magnum DS80 Chassis.......................................................................7
2.2.2 10 / 100 Speed Auto-sensing...............................................................7
2.3 Bridge logic between the 10 Mb and 100Mb Domains....................................8
2.4 Up-link on Port # 8 for Cascading...................................................................8
2.5 Features and Benefits.....................................................................................9
2.6 Applications.................................................................................................10
3.0 INSTALLATION .................................................................................... 11
3.1 Locating Magnum DS80 Dual-Speed Hubs...................................................11
3.1.1 Table-Top or Shelf Mounting............................................................11
3.1.2 Wall (or Vertical Surface) Mounting.................................................11
3.2 Connecting Ethernet Media ........................................................................12
3.2.1 Connecting Twisted Pair (RJ-45, Cat-3, CAT-5)................................12
3.3 Powering the Magnum DS80........................................................................13
4.0 OPERATION .......................................................................................... 14
4.1 Dual-Speed Functionality.............................................................................14
4.2 Auto-negotiation and speed-sensing .............................................................15
4.3 LEDs ..........................................................................................................16
4.4 Up-link Switch.............................................................................................16
5.0 TROUBLESHOOTING ........................................................................... 17
5.1 Before Calling for Assistance .......................................................................17
5.2 When Calling for Assistance ........................................................................18
5.3 Return Material Authorization (RMA) Procedure .........................................18
5.4 Shipping and Packaging Information.............................................................19
APPENDIX A: WARRANTY INFORMATION........................................................ 20

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
2
1.0 SPECIFICATIONS
1.1 Technical Specifications
100 or 10 Mbps per port, auto-sensing for speed. DS80 Personal Hubs
support two traffic domains, one at 100Mbps and one at 10Mbps,
have eight RJ-45 ports, and an up-link port for cascading to another hub.
Performance
When a port is operating at 100Mbps:
Data Rate: 100Mbps
PDV (Path Delay Value) : 80BT, exceeds Class II
When a port is operating at 10Mbps:
Data Rate: 10Mbps
Partitioning: Enforced after 63 consecutive collisions
Auto-reconnect: Occurs after one packet of error-free reception
Network Standards
100Mb: Ethernet IEEE 802.3u ,100BASE-TX
10Mb: Ethernet IEEE 802.3, 10BASE-T
Auto-sensing for speed: IEEE 802.3u
Packet-Processing Between Domains (internal 10/100 switch)
Filtering & Forwarding Rate from 100Mbps ports: 148,800 pps max
Filtering and Forwarding Rate from 10 Mbps ports: 14,880 pps max.
Processing type : Store and Forward
Auto-learning : 1.8K address table, shared for both traffic domains
Packet buffers : 256KB, dynamically shared on both domains
Latency (not including packet time) : 100 to 10 Mbps : 5µs
10 to 100Mbps : 5µs
CPU Type : State Machine
Maximum Ethernet Segment (or Domain) Lengths
10BASE-T (Unshielded twisted pair) - 100 m (328 ft)
100BASE-TX (CAT 5 UTP) - 100 m (328 ft)
Operating Environment
Ambient Temperature: 32§F to 122§F (0§C to 50§C)
Storage Temperature: -5§C to 160§F (-20§C to 70§C)
Ambient Relative Humidity: 10% to 95% (non-condensing)
Power Supply (External)
Input: 95-125 vac at 60Hz for “-d” Models
200-250 vac at 50Hz for “-i” Models, which have IEC
power cable connector in the external power unit.
Output: 5VDC, 3Amps
Polarity: center positive, shell negative
Power Consumption: 8 watts typical, 10watts max.

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
3
(1.1 Technical Specifications, continued)
48VDC Power Supply (Optional)
Power Input Voltage : 36 to 70 VDC (auto ranging)
Terminal Block in rear: “-, GND, +”
Power Consumption: 20 watts max.
Network Cable Connectors - for the eight RJ-45 shielded female ports per hub
100Mbps : Category 5 UTP/STP
10 Mbps : Category 3, 4, 5 UTP (Note: speed-sensing does not sense the
cable type)
UP-LINK
Up-link port for connecting to a central hub or another cascaded hub. The
up-link port #8X is auto-sensing for speed, and the auto-negotiating up-link
port works the same at 10 Mbps or 100Mbps .
Packaging
Enclosure: High strength metal. Metal mounting brackets included.
Suitable for wiring closet shelf, wall or desktop mounting.
Dimensions: 8.6 in D x 4.0 in. W x 10 in. H ( 21.9cm x 100.1cm x 2.6cm)
Weight: 1.75 lb. ( 810 g.)
Cooling method: Fan cooled, internal @ 5 cfm
LED Indicators
PWR: Steady On when power applied
COL: Collision LEDs, one each for 100Mb and 10Mb speed domains
ACT: Common packet activity indicator, one for each traffic domain
LINK/ACT(10Mbps): Steady On when speed is 10Mbps, with no traffic,
blinking indicates 10 Mbps activity
LINK/ACT(100Mbps): Steady On when speed is 100Mbps, with no traffic,
blinking indicates 100Mbps activity
Agency Approvals
UL Listed (UL 1950), cUL, CE
Emissions: meets FCC Part 15, Class A
Warranty
Three years, return to factory Made in USA

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
4
1.2 Ordering Information
Magnum DS80 Dual-Speed Personal Hubs
Magnum DS80-d: Dual-Speed 10/100 Personal Hub with eight RJ-45
ports, each auto-sensing for 100Mbps or 10 Mbps operation, and an internal switch
that bridges the two traffic domains, filtering and selectively forwarding packets
between the 100Mbps and 10 Mbps domains. The internal switch has a 256K
dynamic store-and-forward buffer and an 1.8K node address table. An external
115vac 60Hz power supply provides DC power at 5V. Fan-cooled for high reliability,
even in very warm locations. Metal mounting clips are included.
Magnum DS80-i: Same as Magnum DS80-d but with external
230VAC 50Hz power supply
Garrett Communications reserves the right to change specifications, performance
characteristics and/or model offerings without notice.

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
5
2.0 INTRODUCTION
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:
1Magnum DS80 Dual-Speed Hub unit
1External Power Supply, 5VDC from either 115v 60Hz or 230v 50Hz
1Set of metal clips and screws for secure shelf or wall-mounting
1Installation and User Guide
1Product Registration Card
Remove the Magnum DS80 Dual-Speed 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 use the original shipping container. Refer to Chapter 5,
Troubleshooting, for specific return procedures.

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
6
2.2 Product Description - General
Magnum DS80 Dual-Speed hubs have eight RJ-45 ports, each 10/100Mbps
auto-sensing. Each port can independently identify (via IEEE 802.3u auto-sensing) and
accept either 100Mbps or 10 Mbps Ethernet signals, adapting to match the best speed of
the connected device. There are two internal traffic domains in Magnum DS80 hubs,
one for the 100Mbps traffic and one for the 10 Mbps traffic. The 100Mbps users share
the 100Mbps domain’s bandwidth and the 10 Mbps users share the 10 Mbps domain’s
bandwidth.
Figure 2.2.1 : Magnum DS80 is functionally both a 10 Mbps and a 100Mbps hub
in one
The Magnum DS80 includes an internal bridge or switch I.C. (Integrated
Circuit) which interconnects the 10 Mbps and the 100Mbps traffic domains. This
enables all users on a DS80 hub, whether 100Mbps or 10Mbps, to talk to each other.
The internal switch of the DS80 filters and selectively forwards packets between the 10
Mbps and the 100Mbps domains, maintaining peak performance in each domain
unaffected by local traffic in the other domain. The internal bridge is self-learning, with
large address table capacity for up to 1.8K node addresses. As networked nodes are
added or removed or move from one speed domain to the other, the DS80’s internal
switch automatically keeps track.
Figure 2.2.2 : DS80 with a
switch chip built-in for 10 to
100 bridging
Any DS80 port can connect into either the 100 or the 10 Mbps traffic domain,
and can also change from one traffic domain to the other at any time without affecting
the speed of other ports. The automatic per-port speed-sensing is continuous (it takes
place at LINK enable, see Section 4.2 for details), allowing the connected devices to
GARRETT
PWR 1 2 3 4 5 6 7 8
Magnum
8000E 9 10 11 12
Stackable
Hub
GARRETT
PWR 1 2 3 45 6 7 8 9 10 11 12
10Mbps Hub 100Mbps Hub DS80
1 2 3 4 5 6 7 8 - 8X
COL
PWR 1 2 3 4 5 6 7 8
100M LINK/ACT
10M LINK/ACT
GARRETT
Magnum DS80 Dual-Speed
Personal HubR
1 2 3 4 5 6 7 8 - 8 X
COL
PWR 1 2 3 4 5 6 7 8
100M LINK/ACT
10M LINK/ACT

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
7
change speed at any time without impairing the operation of the other ports and
connected devices.
2.2.1 Magnum DS80 Chassis
The Magnum DS80 chassis houses one main PC board with a bridge IC on
board, and an external power supply unit. The front side of the chassis has eight RJ-45
twisted-pair ports and one cascading (Up-link or Crossover) Port, # 8X, on the right.
LEDs to indicate
operating status are on the left front side. There are power (PWR) and collision (COL)
indicators for the unit. There are Link and Activity (LINK/ACT) indicators for each of
the 10 Mbps and 100Mbps
domains, set into an aligned
arrangement, for visual
indication of the operating
status
Magnum DS80 Dual-Speed Hub
of each port. (See Section 1.1 “Specifications” for a technical description of the LEDs).
The unit has a small quiet cooling fan inside in the center which sends warm air out,
through the ¼” plenum space, away from the unit to the rear.
The DC power plug connector or “jack” is in the right rear of the chassis.
The external power supply is for either 95 - 125vac at 60 Hz for “-d” models or 200-
250vac at 50Hz for “-i” models, which have IEC power cable connector in the external
power supply housing.
2.2.2 10 / 100 Speed Auto-sensing
All eight RJ-45 twisted pair ports support auto-sensing for speed, independent
of the other ports. Speed-sensing is performed by the DS80’s electronics in accordance
with the standards of the IEEE 802.3u auto-negotiation standard. If the connected
device or node indicates that it is capable of 100Mbps speed, then operation on that port
will be at 100Mbps. If the connected device does not positively indicate that it is
capable of 100Mbps speed, then the operation on that DS80 port will be at 10Mbps. Of
1 2 3 4 5 6 7 8 - 8 X
COL
PWR 1 2 3 4 5 6 7 8
100M LINK/ACT
10M LINK/ACT
GARRETT
Magnum DS80 Dual-Speed
Personal HubR

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
8
course, the hubs’ auto-negotiation technique is only for 10/100 speed, and does not
provide for any full-duplex operation.
The per-port 10/100Mbps Link/Activity LEDs on the front panel
indicate the result of auto-sensed speed detection, and the resulting connectivity to
either a 10 Mbps or 100Mbps device. The 100Mbps LED will illuminate (GREEN)
when 100Mbps signals are detected; it will be steady ON if no traffic and blinking ON
when the port transmits and receives data packets. Similarly, the 10 Mbps port will be
on when a 10 Mbps signal (or no reply to auto-negotiation) is detected, and will blink if
the linked port is transmitting and receiving packets.

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
9
2.3 Bridge logic between the 10 Mbps and 100Mbps Domains
Figure 2.4 : Internal view of
DS80 with bridge chip
Magnum D80’s
contain a bridge chip (Integrated Circuit) to interconnect the two traffic domains,
filtering and selectively forwarding packets to allow only necessary packets to cross
between the domains. This enables all of the users and nodes connected into either
domain, whether 100Mbps or 10 Mbps , to communicate to each other, and it keeps
local traffic on one domain from consuming any of the bandwidth of the other domain.
The bridge operates in the store-and-forward mode, which filters out bad
packets and maintains optimum performance in both domains. Packet forwarding delay
is only 5µs (plus packet time), much less than traditional store-and-forward bridge
products, enabling DS80s to maintain high network performance. The bridge has 1.8K
node address capacity, suitable for use in medium-sized networks. Addresses are self-
learning so that filtering/forwarding of 10 Mbps and of 100Mbps packets is maintained
correctly even when users move their connection, or change speed, or power down.
2.4 Up-link Port 8X for Cascading
The unit has an up-link Port # 8X, located on the right-front side of the hub. It
enables the port’s cable to cascade to another shared hub or switching hub port. (See
Section 4.4 for more details about up-link). Like all DS80 ports, Port # 8X is a dual-
speed port which will sense the speed of the connected device. The up-link operates the
same, whether Port # 8X is connected to either 100Mbps or 10 Mbps devices.
When the up-link port is used to cascade two DS80 hubs, the auto-sensing
feature of the DS80 will cause the connecting link to operate at 100Mbps speed.
Bridge I.C

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
10
2.5 Features and Benefits
nn Supports 10 or 100Mbps network connections on each RJ-45 port
Magnum DS80 Dual-Speed 10/100 hubs combine two logical hubs -- one at
10 Mbps and one at 100Mbps -- in one physical box supporting two traffic
domains. Each port can operate at either 10 or 100Mbps, independently of the
other ports.
nn Auto-sensing for speed, 10 or 100Mb on each port
All ports support 10/100 auto-negotiation for speed, operating separately on
each port. Any mix of 10 Mbps and 100Mbps users can be connected to the
ports. Speed-sensing is continuous, occurring at LINK enable. Individual
ports can change to 100Mbps or 10 Mbps speed at any time, adapting to any
changes in the connected device’s speed. Speed-sensing complies with IEEE
802.3u, providing interoperability with other products.
nn An internal switch connects the 10 and 100Mb domains
Magnum DS80 has an internal switch for filtering/forwarding traffic between
the 10 and 100Mbps domains, allowing all connected devices to communicate
to each other. High performance switching provides full bandwidth in each
domain, unaffected by local traffic on the other domain.
nn Installation is “Plug and Play”, operation is transparent to software
The Magnum DS80 operates as a hardware switch, only forwarding those
packets from each domain that are needed on the other domain. Internal
address tables are self-learning, enabling users to change port connections or
10/100 domains without affecting operations. The switch in the DS80 will
not affect any standard software applications or SNMP network management
platforms.
nn Small enclosure enables use in offices and labs
The compact packaging of Magnum DS80s allows them to be installed in
offices and labs, or virtually any location within reach of a standard AC wall
outlet. They come in a durable metal enclosure for table-top or wall-mounting.
They have an external AC to 5VDC power supply. (Models with a 48vdc
external power supply are optionally available).

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
11
nn Fan cooled operation for high reliability
A small (6mm) quiet fan inside of the DS80 keeps the 100Mb electronics cool
for longer life without failure, and for operation in very warm ambient
temperatures.
2.6 Applications
Example 1 : A Magnum DS80 Personal Hub serves a small office with mixed speed
requirements. Some users operate at 100Mbps, and some users and utility devices (such
as print servers) run at 10Mbps. All share the same hub, and communicate to each
other via the bridge chip inside. Any node can change speed at any time without
affecting network operation or impacting other users.
Figure 2.7.1 : DS80 connects combinations of 10 Mbps and100Mbps network
devices
Example 2 : Where there are existing 10 Mbps hubs and users, they can easily be
cascaded into any port of the DS80. This allows simple plug-and-play addition of
100Mbps ports to an existing 10 Mbps network without having to change it. Nodes that
are capable of 100Mbps speed can be moved to any DS80 dual-speed port, and will
automatically operate at the higher speed. The dual-speed ports on the DS80 can be
used for adding 100Mbps users or for accommodating existing high performance users.
The 100Mbps traffic does not use the bandwidth of the 10 Mbps domain, so overall
performance of the network is improved.
1 2 3 4 5 6 7 8 - 8 X
COL
PWR 1 2 3 4 5 6 7 8
100M LINK/ACT
10M LINK/ACT
GARRETT
Magnum DS80 Dual-Speed
Personal Hub R
Print Server Router
100
Users
Server
100 100
100100
10

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
12
Figure 2.7.2 :
DS80 adds a new
100Mbps domain
to existing 10
Mbps network
3.0 INSTALLATION
This chapter provides instructions for installing Magnum DS80 hubs.
3.1 Locating Magnum DS80 Dual-Speed Hubs
The location of a Magnum DS80 Dual-Speed Personal Hub is dependent on
the physical layout of the network. Typically the hub is placed where combinations of
10 Mbps and 100Mbps network devices need to be connected to communicate with each
other. The sleek and compact size of the unit allows it to be conveniently placed in an
office or lab area, and it can also be either shelf of wall-mounted (see mounting
instructions in 3.1.2 below). Metal wall-mounting clips are included.
Locate an AC receptacle that is within six feet (2 meters) of the intended
Magnum DS80 site. The rugged metal case of the Magnum DS80 will normally protect
it from accidental damage in a lab or workplace setting. Maintain an open view of the
front to visually monitor the status LEDs. Place the unit in an open area so that fan-
driven cooling air can enter each side of the unit and exit in the rear..
3.1.1 Table-Top or Shelf Mounting
The Magnum DS80 Dual-Speed Personal Hub can be easily mounted on a
table-top or any suitable horizontal surface, and has four rubber feet to provide stability
without scratching finished surfaces.
1 2 3 4 5 6 7 8 - 8 X
COL
PWR 1 2 3 4 5 6 7 8
100M LINK/ACT
10M LINK/ACT
GARRETT
Magnum DS80 Dual-Speed
Personal HubR
Print Server
100
Router
10 Mb Hub
100
Users
100 100
100
Server
GARRETT
1 2 3 4 5 6 7 8 9 10 11 12
10 10
10 10

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
13
3.1.2 Wall (or Vertical Surface) Mounting
Each Magnum DS80
Personal Hub is shipped with two
metal mounting brackets (and screws)
to allow the unit to be mounted in
nearly any desired orientation or
position. The brackets are attached
to the metal hub case using one of the
metal screws for each bracket and attaching to the Magnum DS80 through the round
hole of the bracket. A user-supplied screw attaches the bracket to the mounting surface.
It is recommended that the brackets be attached to two opposite corners of the unit.
When properly attached, the
brackets will extend slightly below
the base of the unit to allow
clearance for the rubber feet.
3.2 Connecting Ethernet Media
The Magnum DS80 Dual-Speed Personal Hub can be connected to the
following two media types: 100BASE-TX and 10BASE-T. CAT 5 cables should be
used when making 100BASE-TX connections. When the ports are used as 10BASE-T
ports, CAT 3 may be used. In either case, the maximum distance for unshielded
twisted pair cabling is 100 meters (328 ft).
Media IEEE Standard Connector
Twisted Pair (CAT 3) 10BASE-T RJ-45
Twisted Pair (CAT 5) 100BASE-TX RJ-45
NOTE : It is recommended that high quality CAT. 5 cables (which work for both 10
Mbps and 100Mbps ) be used whenever possible in order to provide flexibility
in a mixed-speed network, since dual-speed ports are auto-sensing for either
10 and 100Mbps. Note that the speed auto-sensing function does not sense
the cable type.
Proper attachment of
mounting bracket for wall mounting
PWR
COL
Magnum DS80 Dual Speed
Personal Hub
Top view - Magnum DS80 with
brackets attached for wall mounting
GARRETT

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
14
3.2.1 Connecting Twisted Pair (RJ-45, CAT 3 or CAT 5, Unshielded or
Shielded)
The following procedure describes how to connect a 10BASE-T or 100BASE-
TX twisted pair segment to the RJ-45 port. The procedure is the same for both
unshielded and shielded twisted pair cables.
1. Using standard twisted pair media, insert either end of the cable with an RJ-45
plug into the RJ-45 connector of the port. Note that, even though the connector is
shielded, either unshielded or shielded cables and wiring may be used.
2. Connect the other end of the cable to the corresponding device.
3. Use the LINK LED to ensure proper connectivity by noting that the LED will be
illuminated when the unit is powered and proper connection is established. If
this does not help, ensure that the cable is connected properly and that the device
on the other end is powered and is not defective.
4. For Port # 8, if the LINK LED is not illuminated, exchange the RJ-45 wiring
plug with port # 8X which has a cross-over or up-link connector for linking to
another hub.
3.3 Powering the Magnum DS80
Magnum DS80 Personal Hub is provided with an external power supply, and has
a jack for the DC power cord in the rear. A lightweight DC power cord for 5V, 3Amps
is supplied with each unit. The small DC power cord from the power supply plugs into
the matching rear power jack of the DS80. When the power is applied, the green PWR
LED will illuminate.
Each Magnum DS80
power supply supports
standard AC installation
environments and comes in
two types; one version for
AC input power of 115vac at 60Hz for “-d ” models, and other version of 230vac at 50
Hz for “-i ” models that have IEC power cable connector in the external power unit.
Examine the power supply to make sure the version you have is the right type for
your AC power system. The 115vac 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 230vac version has a small transformer integral with an
Power Jack
External
Power Supply
Magnum DS80 Stackable
Personal Hub
GARRETT
DC5V

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
15
IEC-type power plug for a user-supplied AC power cord with a convenience power
outlet plug.
3.4 Cooling the Magnum DS80
Magnum DS80 based on smart cooling design is a fan cooled unit. DS80 is designed
very carefully, so that the unit get cooled easily while running. The air exhale out
smoothly from the rear side of the unit. There is two layer of metal on the top of the box
and the cooling fan is mounted on the bottom layer of the top. The gap between these
two layer of metal is used for exhaled out the hot air inside and keep the unit cooler. It
is shown in the figure above.
4.0 OPERATION
This chapter describes the function and operation of the Magnum DS80 hubs.
4.1 Dual-Speed Functionality
The Magnum DS80 handles the two different traffic domains separately. The
DS80 provides switched (bridged) connectivity between the Ethernet (10Mbps) and
Fast Ethernet (100Mbps) domains. It joins the two network domains for unified
operation, and filters/ forwards packets in both directions to maximize bandwidth
utilization and performance. Magnum DS80s are hardware plug-and-play devices. There
is no software set-up to be done at installation or for maintenance. The functions of the
DS80s are described in this manual.
Each time a packet is received on one domain of the bridge chip, the decision
is taken to either to filter or forward the packet. Errored packets are always filtered. For
good packets, the filter and forward decisions are made based on the destination address
contained in each packet. If the destination address is on the same domain from which
GARRETT
DC 5V
Cooling Fan
Air coming out of the rear of unit

Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
GARRETT
16
the packet originated, then it is filtered and not forwarded to the other domain. If the
destination address is not found to be a match in the address table for the originating
domain, then it is forwarded to the other domain. If it is a new node address coming in
which the switch did not previously know about, it “learns” the new address and puts it
in the correct port address table. See “Address Learning” for more details.
This diagram below shows the filter / forward logic for both domains.
Magnum DS80
Figure 4.1 : Filtering and Forwarding in DS80 Personal Hubs
Packet Source Destination Address Table Filter/Forward
Source Address Address Maintenance Action
10 Mbps Not in table Not in table Add source to table Forward
10Mbps Not in table In table Add source to table Filter
10Mbps In table Not in table None Forward
10Mbps In table In table None Filter
100Mbps Not in table Not in table Add source to table Forward
100Mbps Not in table In table Add source to table Filter
100Mbps In table Not in table None Forward
100Mbps In table In table None Filter
Table 4.1: DS80 Dual-Speed Hub Functionality
2. Address Learning (Address Table Maintenance)
The Magnum DS80 bridge chip is a state machine design which has a total
address table capacity of 1.8K addresses. With a large address table, a Magnum DS80
can serve the needs of a medium-sized to large network. Table 4.1 shows what filter /
forward action the Magnum DS80 will take in each packet-processing situation, and
when a new node address will be added to the internal Address Table. When a new
node-address packet comes into a port for the first time, then the new source address is
10 Mbps Domain
100 Mbps Traffic
10Mb Domain : 10Mbps packets are
forwarded when the destination addresse is
NOTin the 10Mb domain address table. 100Mbps Domain :100Mbps packets are
forwarded when the destination address is
NOTin the 100Mb domain address table.
10Mbps Domain:10Mbps packets are
filteredwhen the destination address is
in the 10Mbps domain address table.
100Mbps Domain :
100Mbps packets are
filtered when the destination address is
in the 100Mbps domain address table.
10 Mbps Traffic
BridgeI.C
100 Mbps Domain