HP J3188A User Manual

Installation and
Reference Guide

HP J3188A

HP 10Base-T Hub-16M

HP 10Base-T Hub-16M (J3188A)

Installation and Reference Guide

© Copyright 1997 Hewlet t-Packard Company
All Rights Reserved.

This document contains information which is protected by
copyright. Reproduction, adaptation, or translation without
prior permission is prohibited, except as allowed under the
copyright laws.

Publication Number

J3188-90001
Edition 1
July 1997

Applicable Product

HP 10Base-T Hub-16M (J3188A)

Trademark Credits

MS-DOS® and Microsoft® are U.S. registered trademarks of
Microsoft Corporation. Ethernet is a registered trademark of
Xerox Corporation. CiscoView is a trademark of Cisco
Systems, Inc.

Disclaimer

The information contained in this document is subject to
change without notice.

HEWLETT-PACKARD COMPANY MAKES NO WARRANTY
OF ANY KIND WITH REGARD TO TH IS MAT ERIAL,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. Hewlett-Packard shall not
be liable for errors contained herein or for incidental or
consequential damages in connect ion w ith the fu rn is hing,
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 booklet and the registration form included
with the product.

A copy of the specific warranty terms applicable to this
product and replacement parts can be obatined from your
Cisco Sales and Service Office or authorized dealer.

HP 10Base-T Hub-16M (J3188A)

F

b

Back of the Hub

HP 10Base-T Hub-16M (J3188A)

The HP 10Base-T Hub-16M (J3188A) is a multiport repeater with 16 twisted­pair ports, and one AUI port. With thi s hub, you can connect computers,
printers, and server s togethe r for file sharing. Thi s hub is com pliant with the
IEEE 802.3 Type 10Base -T sta ndard and supports both 802.3 and Ethernet
networks. The HP Hub-16M follows these two st andards by providing these
features:

■ lighting the hub’s port LED when it detects the connected device is

powered on and cable is good.

■ retransmitting data that did not suc cessfully arrive at the destination

device (collision detect ion).

■ temporarily disabling a port if a device connected to the port persistently

causes problems for the ne twork (auto-partioning).

ront of the Hu

System

Hub status LEDs (Fault, Security,
Collision, Activity)

RPS Status

Twisted Pair port
status LEDs

MDI/MDI-X
switch for
port 16.

Twisted-pair
ports

RPS connector Serial Port Password

AUI Connector for
External
Transceiver

Reset
Button

iii

HP 10Base-T Hub-16M (J3188A)

Features

Network Connections • Sixteen RJ-45 ( twisted-pair ) ports to connect to end nodes or other devices.

• A Media Depend en t Interface (MDI) switch for Port 16 which allows you to connect
either an end node (MDI-X position) or to cascade a hub (MDI position) to the port ,
using a “straight-through” twisted-pair cable in both cases. Ports 1 through 15 always
are MDI-X. P ort 16 ha s a fact ory defa ult of MDI- X, but ca n be togg led to an MDI state
with the adjacent push-button.

• An AUI port in the fr ont of the hub for several t ypes of extern al transceiv ers, includ ing
ThinLAN, twisted-pair, and fiber-optic. The twisted-pair transceiver adds another RJ­45 port for a total of 17 twisted-pair por ts on the hub. The fiber- optic transceiver
allows you to connect your hub to a fiber - optic backbone.

Easy-to-Use Design • Hub Status LEDs showing power, activity, collisions, RPS status, fault, securit y an d

Standards-Based
Compatibility

Other Features • Extended hub manag eme nt capabilities, providing a full set of management

port status prov ide quick, easy-to-read hub status in formation and tro ubleshooting
help.

• Metal brackets (included with the hub) that can be easily attached to the hub for
mounting the hub in a standard 19-inch telco rack.

• IEEE 802.3 Type 10Base-T standard compatibility to support both 802.3 and Ethernet
networks.

• Advanced embedded SNMP agent code enabling the hub to be managed remotely
from a network manag ement station that supports Simple Network Management
Protocol (SNMP) over IP (using the configured IP address) or Novell NetWare (IPX).
The agent code also provides HP EASE (Embedded Advanced Sampling Environment),
which samples network data for enhanced diagnostics from a network management
station.

commands tha t can be executed from an ASCII cons ole session. Thes e are describe d
later in this document in chapter 3, “Managing the Hub.”

• An RS-232 serial port that provi des out-of-band m an agement access including:
– An ASCII consol e to configure, monit or, and troubleshoot the hub.
– Variable baud rates on the hub’s out-of-band management RS-232 port, and

automatic sensing of the selected baud rate when connecting to a terminal device.

– Full V.22bis modem line control for remote out-of-band management access to the

hub.

– Updatable firmware that enables enhancements to be downloaded either from a

computer attach ed to the out-of-band management port or over the network.

• A Redundant Power Supply (RPS) connector that enables an RPS to be connected to
the hub, providing an alternative redundant power source.

• Advanced inte grated design including an Intel i960 RISC processor, 1 megabyte RAM,
and 512 kilobyte s of fl ash EEPRO M for conf igur atio n and futur e up gr ade c apab iliti es.

iv

Contents

1 Installing the Hub

Installing and Configuring Your Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1. Verify included parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2. Connect the external transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

3. Verify the hub operates correctly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

4. Mount the hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

5. Connect the hub to your network . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Connecting Devices to the Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Connecting Hubs Together . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Interpreting LED Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Interpreting Hub Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Interpreting Port Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

2 Troubleshooting

Troubleshooting Approaches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Using a Checklist to Diagnose the Hub . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

LED Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Hub Maintenance Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Testing the Hub Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Clearing a Password for the ASCII Console . . . . . . . . . . . . . . . . . . . . . 2-5

Running Connectivity Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Obtaining Firmware Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

3 Managing the Hub

Setting up the ASCII Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Starting the Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Console Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

v

A Cables and Connectors

Recommended Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Twisted-Pair Cable/Connector Pin-Outs . . . . . . . . . . . . . . . . . . . . . . . A-3

Twisted-Pair Cable for Hub-to-Compu ter Network Connection . . . . A-3

RS-232 Connector and Cable Pin-Outs . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Minimum Cable Pinout for ASCII Console Connection . . . . . . . . . . . A-5

RS-232 Modem Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Twisted-Pair Cable Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

B Specifications

Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Electromagnetic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

C Modem Configuration

D Network Addressing

Communication Between the Hub and Network Management Station

D-1

IPX Addressing for Novell NetWare . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2

IPX Addressing Notes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2

IP Addresses for IP and Non-IP Networks . . . . . . . . . . . . . . . . . . . . . D-2

Globally Assigned IP Network Addresses . . . . . . . . . . . . . . . . . . . . . . D-2

Device IP Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-3

Using BOOTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4

The BOOTP Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4

BOOTP Table File Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-5

E Backup Links

How Backup Links Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

vi

Additional Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

Examples of Backup Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3

How the Backup Function Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3

Configuring a Backup Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5

Configuration/Installation Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . E-5

Identifying the Backup Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-6

Indications of Backup Link Activation . . . . . . . . . . . . . . . . . . . . . . . . . E-6

Reactivating the Primary Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7

F Security Information

Understanding Network Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

How Intruder Prevention Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2

How Eavesdrop Prevention Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2

Authorized MAC address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2

Setting Inbound Security with Intruder Prevention . . . . . . . . . . . . . F-4

Auto Port Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5

Send Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5

Setting Outbound Security with Eavesdrop Prevention . . . . . . . . . . F-6

G Safety and Regula tory Statements

Mounting Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1

Power Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-2

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-3

Informations concernant la sécurité . . . . . . . . . . . . . . . . . . . . . . . . . . . G-4

Hinweise zur Sicherheit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-5

Considerazioni sulla sicurezza . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-6

Consideraciones sobre seguridad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-7

Safety Information (Japanese) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-8

Regulatory Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-9

vii

Installing the Hub

This chapter describes how to install the hub. Topics in this chapter include

■ installing and configuring the hub

■ connecting devices to the hub

■ connecting hubs together

■ interpreting hub LEDs

1

Installing the Hub

Installing and Configuring Your Hub

Installing and Configuring Your Hub

To install and configure your hub, you must complete five basic tasks. They
are:

Installing the Hub

■ locating and verifying the necessary parts

■ connecting an external transceiver (if necessary)

■ connecting the hub to a power source

■ mounting the hub

■ connecting the hub to your network

1. Verify included parts

Each Hub-16M has the following components shipped with it:

■ HP 10Base-T Hub-16M (J3188A) Installation and Reference Guide—

this manual (J3188-90001)

■ A U.S./Canada/Mexico (8120-1378) power cord.

■ Accessory kit (5064-2 05 3) :

• bumper feet (4)

• hub-to-rack screws 10-32 (4)

• bracket-to-hub screws 10-32 (4)

• nylon fini shing washer (4)

• bracket-to-hub screws (2)

• AUI retainer assembly

1-2

2. Connect the external transceiver

Because of the way the external transceiver protrudes out from hub once it is
connected, you may wan t to i ns tal l th e ex te rn al tr ansceiver before insta l li n g
the hub. Inspect your installation site and identify whether enough room will
be available for the external transceiver to be connected. Then see your
external trans ceiver guide for i n stallation instruct ions.

3. Verify the hub operates correctly

Before mounting the hub, connect it to a power source and verify the hub will
operate correctly.

Installing and Configuring Your Hu b

Installing the Hub

1. Plug the power cord into the hub’s powe r cord recepta cle and into an AC
(alternating current) power source. If you are using an RPS as your
primary power source, refer to the Cisco RPS User Guide for specific
instructions.

Note If your RPS is the p rimary power source for the hub, disc onnect the AC powe r

cord connected directly to the hub for proper opera tion.

(Optional) Connect Redundant Power Supply connector
If not connecting a Redundant Power Supply,
connect included power cord here and to an
alternating current power source.

cord clip here.

Installing the Hub

Note The hub does not have a power switch; it is powered on when the power cord

is plugged in. HP recommends that you only use one power source at a given
time.

1-3

Installing the Hub

Installing and Configuring Your Hub

2. Check the LEDs on the hub’s front panel. When the hub is powered on, it
performs a power-on self te st. See the table below for the L ED pattern
that occurs during the self test.

Installing the Hub

On for 20 seconds,
then enters
normal operating
state.

On for five
seconds, then
enters normal
operating
state.

On for 20 seconds,
then enters
normal operating
state.

LED Pattern

Port LEDs,
Fault, Security,
AUI

Activity,
Collision, RPS

System Stays ON.

ON for approxim ately 20 seconds, then enters normal oper ating
state.

ON for approximately five seconds, then enters normal operating
state.

Note that once you have connected cables to the hub, a Port LED stays
on if link beat has been detected at the port. A Port LED turns off if link
beat is not detected. The AUI port stays on if it is enabled.

When the self test com pletes s uccessful ly, th e LEDs go into their normal
operational states. If a hub hardware fault exists, the hub will not
complete self test. This will be indic ated by an abnormal LED pattern.

1-4

If the self test time elapses and the Fault LED continues to stay on instead
of turning off, the h ub may have an error condi ti on . If re pe ati n g th e sel f
test does not correct the problem and the Fault LED still stays continu­ously on, contact your reseller for replacement information. After the hub
has passed its self test, you are ready to mount the hub.

4. Mount the hub

Installing and Configuring Your Hu b

Installing the Hub

The HP Hub-16M can be mounted in two ways:

1. in a rack or cabine t

2. on a table

The hardware for mounting the hub is included in the accessory kit
(5064-2053) packed with the hub. Before mounting the hub, unplug it.

See Appendix G, “Safety and Regulatory Standards,” for general mounting
precautions.

Rack or Cabinet Mounting

Warning The rack or cabinet should be adequately secured to prevent it from

becoming unstable and/or falling over. Please see Appendix G, “Safety
and Regulatory Standards,” for precautions and warnings associated with rack
mounting.

1. Using a Phillips T-1 0 screwdriver, attach the mounting brackets to the hub
with #10-32 x 7/16" silver scre ws (included in th e accessory kit).

2. Position the hub in the rack or cabinet and slide it up or down unt il the
rack holes line up with the bracket holes.

3. Then attach the hub to the rack with the #10-32 x 5/8" black screws and
black nylon washers included in th e accessory kit with a Phillips cross­head screwdriver. (Some cabinets require number 12-24 screws instead.
Make sure you have screws that fit your cabinet or rack before mounting
the hub.)

Installing the Hub

1-5

Installing the Hub

Installing and Configuring Your Hub

Installing the Hub

1-6

Table Mounting

To place the hub on a table or other horizontal surface, no special tools are
necessary. Apply the fo ur feet included in the accessory kit onto the bottom
of the hub. Be certain to pick a sturdy table in an uncluttered area. You may

want to secure the hub’s cabl es to t he leg of the ta ble to prev ent p eople from
tripping over them.

Installing and Configuring Your Hu b

5. Connect the hub to your network

Installing the Hub

Reconnect the hub to either an AC power source or the RPS, depending on
which source you are using . With the hub mounted, you are now ready to
connect the hub to your network. Typical hub connections are:

■ hub-to-device connections. Connecting to network devices such as

computers, and printers.

■ hub-to-hub connections. Connecting to another HP 10Base-T hub, or

other Ethernet hub.

■ hub-to-network backbones. Connecting to a network backbone.

This section describes the different ways you can connect your hub to your
network.

Installing the Hub

1-7

Installing the Hub

Installing and Configuring Your Hub

Connecting Devices to the Hub

To connect a device to the hub, push the RJ-45 plug into the RJ-45 jack until
the tab on the plug clicks into place.

Installing the Hub

RJ-45

Connector
unshielded twisted-pair cable
Category 3, 4, or 5
Cat 3, 4 maximum distance: 100 meters

Connecting Hubs Together

Twisted-Pair Cascade Connections

To expand your network, the hub can be connected to other hubs with
straight-through cable by using the Media Dependent Interface (MDI) switch.

MDI/MDI-X switch

The MDI/MDI-X switch controls h ow the si gnals are s ent through the twiste d­pair cable connected to Port 16. The hub is shipped with the switch in the MDI­X position. The switch has two positio ns:

■ In the MDI posit ion, use Port 16 to connect your hub to another hub. In

this position, the hub reverses the Tx and Rx port pairs for you. This allows

you to use “strai ght-through” ca ble rather than “cross-over” cable t o
connect two hubs together. The cable can be up to 100 meters in length.

■ In the MDI-X position, use Port 16 to connect your hub to a PC or similar

device using “straight-through” cable.

1-8

Installing and Configuring Your Hu b

Installing the Hub

In the following illustration, the first hub is connected to two end nodes and
to a second hub. Note the second hub shows Port 16 connecting to a PC, using
a straight through cable with the port in the MDI-X position.

Straight­Through
Cable from
Hub to PCs

Hub attached to
Port 16: switch in
MDI position and
straight-through
cable is used.

Up to 100 meters

Installing the Hub

PC attached to
Port 16: switch in
MDI-X position
and straight­through cable is
used.

ThinLAN Connections

With an HP ThinLAN External Transceiver for 10Base2 netw orks, you can
connect your hub or a stack of hubs to a thin LAN network. The following
illustration shows a hub with an HP ThinLAN E xternal Transceiver.

1-9

Installing the Hub

Installing and Configuring Your Hub

Installing the Hub

You can connect u p to 30 hubs t ogether on a c ommon ThinLA N segment. The
ThinLAN segment can include a com puter attach ed to a hub at one end of the
segment that can communicate with a computer attached to another hub at
the other end of the segment. By using the BNC port on the module, the
maximum repeater hop-count increment through the entire segment is only
two. The following illustration shows you how to connect three hubs together
from one ThinLAN port to another.

50-ohm
terminator

ThinLAN coax
connecting the
hubs together

50-ohm
terminator

Hub-16M

Hub-16U

HP AdvanceStack
10Base-T Hub-24

Note Each ThinLAN cab le se gment m ust b e ter minat ed u sing a 50- oh m termin at or

at each end. In the illustration above, a 50-ohm terminator is placed at each
end of the cable segment.

1-10

Interpreting LED Status

Connecting the Hub-16M to a Fiber-Optic Backbone

Installing the Hub

With an HP Fiber-Optic external transceiver for 10Base-F L networks, you can
connect your hub to a fiber-optic backbone. The following illustration shows
a hub with an HP Fiber -Opti c ex ter n al tr an sce iv er co n ne cte d to a f i be r- o pt ic
backbone:

Fiber-optic
cable to a
fiber-optic
backbone

HP J2606A Fiber-Optic

For more information about cabling configuration, see the documentation
accompanying the opt ional transceiver modules.

Interpreting LED Status

Installing the Hub

Two types of LEDs exist on the hub. They are:

■ Hub Status LEDs. These LEDs reflect certain conditions that exist on the

hub at large and are not explicitly referring to a give n port.

■ Port Status LEDs. These LEDs reflect basic conditi ons (for example, Link

Beat being enabled) that exist on a specific port.

Status information for both are described in the following tables.

1-11

Installing the Hub

Interpreting LED Status

Interpreting Hub Status LEDs

The hub status LEDs indicate whether the hub is functioning properly. For
further details on error conditions indicated by the Status LEDs, see chapter

2, “Troubleshooting”.

LED State Meaning of LED

Installing the Hub

SYSTEM

(Power)
(green)

ACT

(Activity)
(green)

FLT

(Fault)
(Orange)

SEC

(Security)
(Orange)

RPS

(RPS)
(green)

COL

(Collision)
(orange)

On The hub is receiving power.
Off The hub is not receiving power.

Flickering ON while a pack et is being transm itted. Normall y, the LED appear s

to flicker. In heavy traffic, it may app e ar on all the time.

On
Off
Flash

On
Off
Flash

On
Off

Flickering This LED is on while a collision is detected. If it appears on

An error has been detected on the hub.
No error has been detected on the hub.
Flashes simultaneously with port LEDs, indicating the port is

partitioned.
A security violation has occurred.

Hub security has no t be en violated.
Flashes simultaneously with port LEDs, indicating the port had a

security violation.
The RPS is providing power.

The RPS is not providing power.

continuously (with no flicker), it is a possible indicator of a network
fault or an imp roperly termin ated cable.

1-12

Interpreting Port Status LEDs

Installing the Hub

Interpreting LED Status

The following table provides LED port information.

LED State Meaning of LED

Twisted-pair
Port (green)

AUI
Port (green)

* The slow flash is approximately once every 1.5 seconds.

On Link beat is detected from the attached node.
Off The port is not receiving the link beat signal from the attached

Slow
Flash*

On The AUI port is enabled.
Off The AUI port is di sa b led .
Slow

Flash

node.
The port has been auto-partition ed. This port has been auto-

partitioned (disabled) due to excessive collisions. This port will
reenable when the connected device no longer causes
collisions.

The port has been auto-partition ed.

Installing the Hub

1-13

Troubleshooting

This chapter describes ways to troubleshoot the hub. Topics covered are:

■ troubleshooting approaches

■ using a checklist to diagnose the hub

■ interpreting the LED pattern during self test

■ hub maintenance tasks

Troubleshooting Approaches

There are three primary ways to diagnose hub problems:

■ By checking the LEDs on the front of the hub as described in the section,

“Using a Checklist to Diagnose the Hub” later in this chapter.

■ By using the ASCII console’s diagnostic functions as described in chapter

3, “Managing the Hub.”

■ By using the CiscoView network management application as described in

the CiscoView online help.

2

Troubleshooting
Using a Checklist to Diagnose the Hub

Using a Checklist to Diagnose the Hub

Use the following table to diagnose t he problem with your HP Hub-16M.

Problem Solution

How do I reset the hub? Remove the plug on th e power cord from the

None of the LEDs are on. Verif y that the power cord is plugged into an

Troubleshooting

I lost the password. Press the password reset button for 10 seconds.

IP configuration errors have been
reported.

I want to see if each cable is connected
correctly.

A user can’t send data to another user. Use the Connectivity tests in the ASCII console

power source and reconnect it.

active power source and to the hub. Make sure
these connecti on s ar e sn ug . Tr y p owe r cy cl ing
the hub by unplugging and plugging the hu b
back in.

If the Power LED is still not on, verify the AC
source works by plug ging another device int o
the outlet. Or try plugging the hub into a different
outlet or try a different power cord.

If this condition persists, call your
HP-authorized LAN dealer or HP representative
for assistance.

See page 2-4 for more details.

Use the ASCII console’s IP Conf iguration
function as described in the ch apter 3,
“Managing the Hub.”

Run TEstlink. See the command description in
chapter 3, “Managing the Hub.”

or in CiscoView to test the cabling. The tests are
described in this chapter.

2-2

The Fault LED is on . Remove the plug on the power cord from the

The Security LED is flashing. How do I
get it to stop?

power source and rec onnect it. If problem
persists, the device has an internal failure.
Contact your HP aut ho r iz e d dealer or reselle r .

Use the ASCII console or C iscoView to view t he
intruder log an d clear the security violations.

Most problems with the hub can be diagnosed using t he LEDs on its front
panel. The following section describes the normal LED pattern during self­test, and LED patterns that indicate error conditions on the hub.

Troubleshooting

LED Operation

LED Operation

The tables on the following pages list the hub’s LEDs, their possible states,
and diagnostic tips to resolve any error conditions.

LED patterns indicating problems Diagnostic Tips

Power Coll Por t L ED Sec Fault RPS

OFF** ***Verify that the power cord is plugged

into an active power source and to the
hub. Make sure these connections are
snug. Try power cycling the hub by
unplugging and plugging the hub back
in.

If the Power LED is sti ll not on, verify the
AC source works by plugg ing another
device into the outlet. Or try plugging
the hub into a different outlet or try a
different power co rd.

If this condition persists, call your
HP-authorized LA N dealer or HP
representative for assistance.

ON*OFF***Check cabl ing on the in dica ted po rt a ll

the way out to the device attached to
that port. Faulty wiring or a bad
connection could exist somewhere in
that connecti on.

The end node or hub attached to the
port is off.

The port may be disabled. Use the
ASCII console or management
application to enable the port.

Troubleshooting

If Port 16, check the position of the
MDI/MDI-X switch. See the figure in
chapter 1 that details the MDI/MDI-X
switch.

ON ON * * * * Very frequent collis ions a re occu rring,

which could in dicate a network fa ult or
improperly ter m inated cable.

*This LED is not important for the diagnosis.

2-3

Troubleshooting
LED Operation

LED patterns indicating problems Diagnostic Tips

Power Coll Por t L ED Sec Fault RPS

ON * Fast

Flash

ON * Slow

Flash

ON * * Fast

ON * * * ON * The hub has failed its self-test. Power-

Troubleshooting

ON** **OFFThe internal power supply is operating

ON** **ONThe internal po wer supply has failed or

Fast

**A security violation has occurred on

Flash

*Slow

Flash

**Network management security

Flash

the port that is flashing. See SEcure
command for definition and details in
Chapter 3.

* The port has been aut o- partitioned

because of an excessive collision
condition. Ch eck cable connections
and status of attached network devices
for causes of the excess collisions. The
hub will automatically recover after
certain IEEE 802.3 criteria are
successfully met.

violation occurred. See SEcure
command for details.

cycle the hub. If this condition persists,
call your HP-authorized LAN deal er o r
HP representative for assistance.

properly and the RPS is not being used.

has been unplugged and the RPS has
been activated as the current
operating po w er supply.

2-4

*This LED is not important for the diagnosis.

Troubleshooting

Hub Maintenance Tasks

Hub Maintenance Tasks

There are several hub maintenance tasks you can perform. They include:

■ testing the hub only

■ clearing a password from the ASCII console

■ running connec tivity tests

Each of these tasks is described in the following sections.

Testing the Hub Only

If you believe that th e hub is not operat ing co rrectly, remove and re insert the
power cord for that hub. Th is procedure will cause the hub to complete its
power-on self-test. If any erro r conditions exist in the hub, the LEDs should
display the condition.

Clearing a Password for the ASCII Console

You can use the Password Reset button to clear a forgotten console password
that was previously configured on the hub. The password is configured from
the ASCII console.

Password
Reset

To clear the password, follow these steps:

1. Verify the hub has powered-up, passed power-on test, and that the System
LED is lit.

Troubleshooting

2. Press the Password Reset button on the bac k of the hub for 10 seconds.

2-5

Troubleshooting
Hub Maintenance Tasks

Running Connectivity Tests

Both the hub and cabling can be tested by running an end-to-end communica­tions test -- a test that sends known data from one network device to another
through the hub -- such that you can verify that the data was correctly
transmitted between the devices.

PC sending test
packets.

PC responding to
the test packets.

Troubleshooting

2-6

See your LAN adapter’ s manual for information on running an end-to-end
communication test.

Obtaining Firmware Enhancements

In the future, Hewlett-Packard may provide improv ements to this product
through fi rmware up grades. T he upg rade code can be downloade d from a P C
attached to the hub’s RS-232 port or over the network. The update procedures
are described in documents that come with the firmware enhancements.

You can determine the current firmware version on the hub from the ASCII
console. Look for the SNMP Agent EEPROM version number to determine the
revision. When you access the console, the version number appears.