HP J3128A AdvanceStack
10Base-T Hub-8E
Installation and
Reference Guide
©Copyright Hewlett-Packard
Company 1996. All Rights Reserved.
Reproduction, adaptation, or translation
without prior written permission is
prohibited, except as allowed under the
copyright laws.
Publication Number
Edition 1
February 1996
Applicable Product
HP J3128A
Trademark Credits
MS-DOS® and Microsoft® are U.S.
registered trademarks of Microsoft
Corporation. Ethernet is a registered
trademark of Xerox Corporation.
The information contained in this document is subject to change without
Hewlett-Packard shall not be liable for
errors contained herein or for incidental
or consequential damages in connection
with the furnishing, performance, or use
of this material. Hewlett-Packard
assumes no responsibility for the use or
reliability of its software on equipment
that is not furnished by Hewlett-Packard
Warranty. See the warranty statement
and the registration form included with
the product. A copy of the specific
warranty terms applicable to your
Hewlett-Packard product and replacement parts can be obtained from your
HP Sales and Service Office or
authorized dealer.
HP J3128A AdvanceStack 10Base-T Hub-8E
Use the Hub-8E to connect computers, printers, and servers
together to allow users to share resources and data.
The steps to set up your network are:
1. Verify included parts
2. Verify that the hub works
3. Mount the hub
4. Connect devices to the hub
1. Verify Included Parts
Your package includes the following items:
one 8-port hub
AC adapter
this guide
warranty booklet
2. Verify That the Hub Works
To verify that the hub works, follow these steps:
1. Plug the AC adapter’s power cord into the hub’s AC
AC adapter power
Your hub is shipped with one of these AC adapters:
Australia/New Zealand/China/Argentina
South Africa/India
United Kingdom/Hong Kong
Note If your installation requires a different AC adapter than
the one supplied with the hub, contact your
HP-authorized LAN dealer or your local HP sales office.
2. Plug the AC adapter into an AC power source. When
installing the Hub-8E, note that the AC outlet must be located
near the equipment and should be easily accessible.
Note: The hub does not have a power switch; it is powered
on when the power cord is plugged in.
3. Check the LEDs on the hub’s front panel.
When the hub is powered on, it performs a 10 second selfdiagnostic test. During the test, each LED is lit momentarily.
When the self-test completes successfully, the following
events occur:
Power LED stays on
The BNC Partition LED will remain lit unless a
properly terminated thin coax segment is
attached. This LED does not affect the operation
of the other ports.
A Link/Activity LED stays on if a signal has been detected
through a cable connected to the corresponding port. A
Link/Activity LED turns off a signal is not detected.
Before self-test completes, all of the LEDs light momentarily.
The following table describes the meaning of the LEDs:
Reflects the amount of traffic on the
network as a percentage.
Identifies the percentage of collisions
which shows network saturation.
Displays whether a port experienced
excessive collisions or the BNC port is not
properly terminated.
Displays the amount of network traffic for
this port.
Note that the bottom of the hub also provides information
about the meaning of the LEDs for this hub.
4. Before mounting the hub, unplug it. After the hub has passed
its self-test, you are ready to mount the hub.
3. Mount the Hub
The Hub-8E can be placed on a desk or mounted on any vertical or
horizontal surface, for example on a wall or under a desk.
To locate the hub on a table or other horizontal surface, no special
tools are necessary. Be certain to pick a sturdy table in an uncluttered area. You may want to secure the hub’s cables to the leg of the
table to prevent people from tripping over them. If you are placing
the hub on a table, skip the mounting instructions below and continue the installation procedure starting on page 5.
Equipment Required to Mount the Hub
To mount the hub on a wall or under a desk, you will need the
following equipment:
two number 6 by half-inch or M3 by 12 mm pan head wood
screws (not included)
a Phillips (cross-head) screwdriver (not included)
Before mounting the hub, follow these mounting precautions:
Plan the hub’s location and orientation relative to other devices
and equipment. Also consider the cabling that will be attached to
the hub and ports that will be used. In the back of the hub, leave
3 inches (76 mm) of space for twisted-pair cables and the AC
Ensure that the HP AdvanceStack hub(s) do not overload the
power circuits, wiring, and over-current protection. To determine the possibility of overloading the supply circuits, add
together the amperage ratings from the nameplates of all your
hubs (and other equipment) installed on the same circuits and
compare the total with the rating limits for the supply circuits.
Do not install the HP AdvanceStack hub in an environment
where the operating ambient temperature might exceed 40°C
Make sure the air flow around the sides of the hub is not
Marking the Location
A hub should be mounted only to a
wall or wood surface that is at least
1/2-inch (12.7 mm) plywood or its
1. Mark the screw hole locations 5 11/16 inches (14.5 cm) apart
on the mounting surface. Make sure you allow enough room
to make the cable connections to the hub and to access the
cables if they have to be moved.
2. Using a Phillips (cross-head) screwdriver, screw in the two
pan head wood screws leaving 1/8-inch (3 mm) between the
screw head and the mounting surface. (You may need to
pre-drill the surface first with a 3/32-inch bit.)
4. Connect Devices to the Hub
RJ-45 Ports
You can connect printers, servers, personal computers, and other
Ethernet devices to these ports. Each computer must have a LAN
adapter card.
To connect a device to the hub, follow these steps:
1. Push the twisted-pair RJ-45 plug into the RJ-45 jack until the tab
on the plug clicks into place. Use up to 100 meters of cable
between the hub and an end node.
RJ-45 plug
unshielded or shielded
twisted-pair cable
to a computer or printer
2. Connect the other end of the cable to a computer’s LAN adapter
card, printer interface card, server or other device.
Adding More Users To Your Network
You can add more users to your network by joining two or more
hubs together using either thin coaxial cable or twisted-pair cable.
Using Thin Coaxial Cable
You can connect up to 30 hubs together on a common thin coax
segment. The following illustration shows you how to attach a BNC
“T” connector and a required terminator to a hub.
50-ohm terminator
Connect to hub
BNC “T” connector
Thin coax segment
connected to an existing or
new thin coax network
The following illustration shows two hubs connected together with
a thin coax segment:
50-ohm terminator
Thin coax segment
Minimum length: 0.5 meters.
Maximum length: 185 meters.
50-ohm terminator
Each thin coaxial segment must be
terminated using a 50-ohm terminator
at each end or the devices will not be
able to communicate together.
Using Twisted-Pair Cable
To expand your network, the hub can be cascaded to another hub by
using the Cascade port. You can connect up to 4 hubs together by
using this port. The following illustration shows two hubs chained
Standard twisted-pair cable.
No mimimum cable length.
Maximum length: 100 meters.
(This type of connection is also called “MDI/MDI-X” where MDI is the
hub-to-hub connection and MDI-X is the hub-to-a-device connection.
A device is a printer, computer, or other Ethernet product.)
If you connect cable to both the Cascade
port and port 8, the connections will not
work. The two ports cannot be used
Use “straight-through” cable not “crossover cable” between the hubs when using
the Cascade port.
The bottom of the Hub-8E has a troubleshooting key for the LEDs.
Use the table on the bottom of the hub to try to solve the problem
first. Most problems are because of the wrong type of cable,
improper termination of thin coax cable, bad cable, or exceeding the
maximum allowable cable lengths. Use the table below to
troubleshoot your hub.
One of the users on the network can’t
communicate with another network
device through the Hub-8E.
There are a variety of possible solutions
to this problem:
1) Find the port that the user is
currently connected to. Check that
the Link/Activity LED is on. If it is not,
remove the cable from the port and
connect it to another port. If the LED
is still not on, use the “Test Link”
option in the user’s LAN adapter test
program to verify the communication
path between two PCs (connected to
the hub) is working.
2) Connect a different cable from the
end user to the hub.
3) Perform a self-test on the LAN
adapter in the user’s computer and/or
the device that cannot be reached.
4) Verify cable lengths do not exceed
100 meters.
I have coax cable connected to the hub Verify the cable is connected and
but the Partition LED stays orange.
terminated properly. See the illustration
on page 6.
I’ve tried everything in this table but the The hub or power supply may have
hub still doesn’t appear to be working. failed. Try removing the AC adapter and
reinserting it to see if the LEDs begin
normal operation. Try a different
electrical outlet. If the problem
persists, return the hub and AC adapter
to your HP-authorized dealer or reseller
following the instructions in the
warranty booklet.
If you are replacing your hub, remove the cables connected to the
hub before returning it to Hewlett-Packard. For instructions on how
to return the Hub-8E to Hewlett-Packard, see the warranty booklet
included with the hub.
Customer Support Services
Hewlett-Packard offers a range of customer support services
including the World Wide Web, fax, and Network Phone-In Support.
World Wide Web
Do you have questions about designing your expanding network?
From this web site, you can also download the Designing
HP AdvanceStack Workgroup Networks Guide which addresses
capacity planning or dial 1-800-752-0900 to receive a copy by mail.
HP FIRST Fax Retrieval Service
HP FIRST is an automated fax retrieval service that is available 24
hours a day, seven days a week. HP FIRST provides information on
the following topics:
Product information
Troubleshooting instructions
Technical reviews and articles
Configuration information
To access HP FIRST, dial one of the following phone numbers:
Phone Number
U.S. and Canada Only
Dial 1 (800) 333-1917 with
your fax machine or touchtone phone and press 1.
Outside the U.S. and
Dial 1 (208) 344-4809 from
your fax machine and
press 9.
To receive a list of currently available documents, enter document
number 19941. The information you requested will be sent to you by
return fax.
HP Network Phone-In Support (NPS)
Call your HP Authorized Dealer or the nearest HP Sales and Support
Office. In addition, the HP Network Phone-In Support (NPS) service
provides expert technical assistance for U.S. customers through an
NPS contract or at an hourly rate (1-800-790-5544) Monday through
Friday, 5 am to 6 pm.
19 cm by 13.2 cm by 2.6 cm
(7.5 in by 5.25 inches by 1 inch)
635 grams
(1.40 pounds)
AC voltage:
Hub maximum current:
Frequency range:
100–250 volts
(Voltage tolerance of +/- 10%)
0.8 A max
50/60 Hz
(The above specifications are AC adapter specific.)
5°C to 40°C
(41°F to 104°F)
-40°C to 70°C
(-40°F to 158°F)
Relative humidity:
15% to 80%
at 40°C (104°F)
at 65°C (149°F)
Maximum altitude:
3.1 km (10,000 ft)
4.6 km (15,000 ft)
The RJ-45 twisted-pair ports are compatible with the IEEE 802.3
Type 10Base-T standard. Use Category 3, 4, or 5 cabling.
The BNC thin coax port is compatible with the IEEE 802.3 Type
10Base2 standard.
Complies with
IEC 950: (1991)+A1,A2/.EN60950 I(1992)+A1,A2
CSA 950
FCC part 15 Class A
EN 55022 Class A / CISPR-22 Class A
VCCI Level I
Complies with Canadian EMC Class A requirements.
See the Declaration of Conformity for details at the end of the Regulatory
Acoustic Noise
Not applicable
Safety and Regulatory Statements
Safety Information
There are no user-serviceable parts inside these products. Any servicing, adjustment,
maintenance, or repair must be performed only by service-trained personnel.
These products do not have a power switch; they are powered on when the power
cord is plugged in.
Informations concernant la sécurité
Aucune pièce contenue à l’intérieur de ce produit ne peut être réparée par l’utilisateur. Tout dépannage, réglage, entretien ou réparation devra être confié exclusivement à un personnel qualifié.
Cet appareil ne comporte pas de commutateur principal ; la mise sous tension est effectuée par branchement du cordon d’alimentation.
Hinweise zur Sicherheit
Dieses Gerät enthält innen keine durch den Benutzer zu wartenden Teile. Wartungs-,
Anpassungs-, Instandhaltungs- oder Reparaturarbeiten dürfen nur von geschultem
Bedienungspersonal durchgeführt werden.
Dieses Gerät hat keinen Netzschalter; es wird beim Anschließen des Netzkabels
Considerazioni sulla sicurezza
Nessun componente di questo prodotto può essere riparato dall’utente. Qualsiasi lavoro di riparazione, messa a punto, manutenzione o assistenza va effettuato esclusivamente da personale specializzato.
Questo apparato non possiede un commutatore principale; si mette scotto tensione
all’inserirsi il cavo d’alimentazione.
Consideraciones sobre seguridad
Este aparato no contiene pieza alguna susceptible de reparación por parte del
usuario. Todas las reparaciones, ajustes o servicio de mantenimiento debe realizarlos
solamente el técnico.
Este producto no tiene interruptor de potencia; se activa cuando se enchufa el cable
de alimentación.
Regulatory Statements
FCC Statement (For U.S.A. Only)
Federal Communications Commission Radio Frequency
Interference Statement
Warning: This equipment generates, uses, and can radiate radio frequency energy.
If it is not installed and used in accordance with the instruction manual, it may cause
interference to radio communications. It has been tested and found to comply with
the limits for a Class A computing device pursuant to 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.
If this equipment causes interference to radio reception (which can be determined by
unplugging the power cord from the equipment) try these measures: Re-orient the
receiving antenna. Relocate the equipment with respect to the receiver. Plug the
equipment and receiver into different branch circuits. Consult your dealer or an
experienced technician for additional suggestions.
VCCI Class 1 (For Japan Only)
This is a class A product. In a domestic
environment, this product may cause radio
interference, in which case the user may
be required to take adequate measures.
Declaration of Conformity
The following Declaration of Conformity for the HP AdvanceStack
10Base-T Hub-8E complies with ISO/IEC Guide 22 and EN 45014.
The declaration identifies the product, the manufacturer’s name and
address, and the applicable specifications that are recognized in the
European community.
Technical information in this
document is subject to change
without notice.
All rights reserved.
Reproduction, adaptation, or
translation without prior
written permission is
prohibited except as allowed
under the copyright laws.
© Copyright 1996
Hewlett-Packard Company
Printed in U.S.A. 2/96
Manual Part Number
J3128-90001, Edition 1
Download PDF