GarrettCom Switch H80B User Manual

G
A
R
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E
T
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Magnum  
Corporate Headquarters:  
Personal Hubs  
Garrett Communications  
213 Hammond Avenue  
Fremont, CA 94539  
Models H80B and H80P  
Phone: 510.438.9071  
Fax:  
510.438.9072  
Installation and User Guide  
 
Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 trademark 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 Garrett Communications  
Please use the mailing address, phone and fax numbers and email  
address listed below:  
Garrett Communications  
213 Hammond Avenue  
Fremont, CA 94539  
Phone: 510.438.9071  
Fax: 510.438.9072  
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 States of America.  
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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 INSTALLATION.................................................................. 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: WARRANTY 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.  
iii  
 
MAGNUM  
ETHERNET C ONNEC TIVITY PRODUC TS  
"DESIG NED AND MANUFAC TURED 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  
 
Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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)- 150 m (492 ft)  
AUI Drop Cable  
10BASE2 ThinNet (BNC)  
- 50 m (164 ft)  
- 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) (H80B, 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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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  
H80-d-ps  
H80-i-ps  
DESCRIPTION  
External 115 vac 60 Hz power supply.  
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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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
1
Magnum H80B or H80P Personal Hub  
External Power Supply, either 115v 60 Hz or  
230v 50 Hz (H80B only)  
1
Velcro® Tape section, approximately 3 inches in  
length  
1
1
User Guide  
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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 Description  
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-medium-  
size office or lab environments (up to eight persons) that need an  
independent Ethernet network. They operate as self-sufficient units  
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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
2.2.2  
Magnum H80P Product Description  
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 unit 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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 location. 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 simple way for  
operational connections of each 10BASE-T segment to be  
verified.  
Low cost, stand-alone 10BASE-T connectivity  
Operating in a stand-alone environment 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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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.  
11  
 
Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 power 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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 straight-  
through or = position so that the switchable up-link port is a user  
port, not an up-link to another hub.  
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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 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 Personal Hub unit.  
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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 in the package. The metal screws in each side 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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
3.5  
Ethernet Media Connections  
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  
Twisted Pair 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 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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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  
1
2
3
4
Function  
Control In Circuit Shield 10  
Control In Circuit A  
Data Out Circuit A  
Data In Circuit Shield  
Data In Circuit A  
Pin  
Function  
Data Out Circuit B  
Data Out Circuit Shield  
Data In Circuit B  
Voltage Plus (+)  
Voltage Shield  
11  
12  
13  
14  
15  
5
6
Voltage Common  
Control Out Circuit B  
7
Control Out Circuit A  
SHELL Protective Ground  
8
9
Control Out Circuit Shield (conductive shell)  
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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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.  
21  
 
Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 the 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 re-  
assurance 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.  
22  
 
Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 Extension: Personal Hubs will automatically add bits to a  
received data packet of less than 96 bits (a "fragment") so that the  
forwarded packet is 96 bits long.  
23  
 
Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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  
1.  
Before Calling for Assistance  
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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Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 Authorization (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) 438-  
9071 (office hours: 8AM - 5PM Pacific Standard Time) or send  
email to [email protected]. 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.  
25  
 
Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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 Information  
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  
26  
 
Magnum H80B and H80P Personal Hubs User Guide (07/95)  
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.  
27  
 

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