Compaq 2724, 2824 User Manual
Netelligent 2724/2824
Dual-Speed Hubs
User Guide
©1997 Compaq Computer Corporation.All rights reserved.
Compaq Registered U.S.Patent and Trademark Office.
Company and product names mentioned herein may be
trademarks and/or registered copyright and trademarks of
their respective companies.
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NOTICE
The information in this publication is subject to change without notice.
COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR
EDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN, NOR FOR INCIDENTAL OR
CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE, OR
USE OF THIS MATERIAL.
This publication contains information protected by copyright. No part of this publication may be
photocopied or reproduced in any form without prior written consent from Compaq Computer
Corporation.
The software described in this guide is furnished under a license agreement or non-disclosure agreement.
The software may be used or copied only in accordance with the terms of the agreement.
Product names mentioned herein may be trademarks and/or registered trademarks of their respective
companies.
1997 Compaq Computer Corporation.
All rights reserved. Printed in the U.S.A.
Compaq
Registered United States Patent and Trademark Office.
Netelligent is a trademark of Compaq Computer Corporation.
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
First Edition (June 1997)
Part Number 299440-001
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v
Federal Communications Commission Notice
Part 15 of the Federal Communications Commission (FCC) Rules and Regulations has established
Radio Frequency (RF) emission limits to provide an interference-free radio frequency spectrum. Many
electronic devices, including computers, generat e RF energy incidental to their int ended function and
are, therefore, covered by these rules. These rules place comput ers and related peripheral devices into
two classes, A and B, depending upon their intended installation. Class A devices are those that may
reasonably be expected to be installed in a business or commercial environment . Class B devices are
those that may reasonably be expected to be installed in a residential environment (i.e., personal
computers). The FCC requires devices in both classes to bear a label indicating the interference
potential of the device as well as addit i onal opera ti ng i nst r ucti ons f or the us er.
The rating label on the device shows which clas s (A or B) the equipment falls into. Class B devices
have an FCC ID on the label. Class A devices do not have an FCC ID on the label . Once the class of
the device is determi ned, r ef er to t he f oll owing corr es ponding s tat em ent .
Connections to the serial COM port on this device must be made with shielded cables with metallic
RFI/EMI connector hoods in order to m ai nta in com pl ia nce with FCC Rules and Regulati ons.
NOTE:
If this equipment contains a Token Ring interface, this equipment is a Class A digital device
when the Token Ring interface is utilized.
Class A Equipment
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, us es, and can radiate radio frequency energy and, if not ins talled and used in
accordance with the instructions, m ay cause harmful interfer ence to radio communicati ons. Operation
of this equipment in a residential area is likely to cause harmful interference, in which case the user
will be required to correct the interference at personal expense.
Modifications
The FCC requires the user to be notifi ed t hat any changes or modifi cat ions made to t hi s device that are
not expressly approved by Compaq Computer Corporat ion may void t he user's author ity to operate the
equipment.
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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vi
Canadian Notice
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment
Regulations.
Avis Canadien
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel
brouilleur du Canada.
European Union (EU) Notice
Products with the CE Marking comply with both the EMC Directive (89/336/EEC) and the Low Voltage
Directive (73/23/EEC) issued by the Commission of the European Community.
Compliance with these directives implies conformity to the following European Norms (in brackets are
the equivalent international standards):
■
EN55022 (CISPR 22) - Electromagnetic Interference
■
EN50082-1 (IEC801-2, IEC801-3, IEC801-4) - Electromagnetic Immunity
■
UL 1950, Third Edition; CAN/CSA C22.2 No. 950-95, July 1995; TUV Rheinland
EN 60950; and 1988 + A1/1990+A2/1991 - Product Safety
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v
Japanese Notice
Fiber Port Class 1 Classification
Compaq fiber ports have been tested in accordance with the IEC 825-1 test standard and found to meet
the Class 1, intrinsically eye-safe emitter classification.
Product Label
CLASS 1 LED
KLASSE 1 LED
The fiber ports on this product have been tested in accordance with the
IEC 825-1 Test Standard and found to meet the Class 1, intrinsically
eye-safe emitter classification.
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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viii
Lithium Battery
The non-volatile RAM (NVRAM) chip on the motherboard of the Netelligent 2824 hub contains a nonreplaceable lithium battery. Only trained service personnel should dispose of this chip.
La puce mémoire non volatile contient une pile au lithium non remplaçable. L'élimination de cette
puce devrait être confieé à un per sonnel quali f i é.
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Contents
Chapter 1
Overview
Features.........................................................................................................................1-2
Package Contents..........................................................................................................1-4
Hub Components ..........................................................................................................1-5
RJ-45 Ports ............................................................................................................1-5
Smart Uplink Slot..................................................................................................1-5
LED Indicators ......................................................................................................1-6
Serial COM Port.................................................................................................... 1-8
Host/Target DIP Switch ........................................................................................1-9
Managed/Unmanaged DIP Switch ......................................................................1-10
Internal 10/100 Switch Disable DIP Switch........................................................1-10
10 ONLY - 10/100 Switch ..................................................................................1-10
10 MDI - 10/100 MDI-X Switch.........................................................................1-11
Segmentation ..............................................................................................................1-12
ix
Chapter 2
Planning Installation
Installation Requirements.............................................................................................2-1
Environmental Requirements................................................................................2-1
Electrical Requirements.........................................................................................2-1
Spatial Requirements.............................................................................................2-2
Cable Requirements...............................................................................................2-2
System Planning Charts................................................................................................2-5
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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x
Chapter 3
Installing the Hub
Mounting the Hub.........................................................................................................3-1
Attaching the Rubber Feet.....................................................................................3-1
Rack-Mounting the Hub........................................................................................3-1
Installing a Smart Uplink Module ................................................................................3-3
Inserting the Smart Uplink Module into the Smart Uplink Slot............................3-3
Connecting Cable..........................................................................................................3-5
Interconnecting Hubs....................................................................................................3-6
Connecting Power.......................................................................................................3-10
Disconnecting Power...........................................................................................3-11
Connecting to the Serial Port......................................................................................3-11
Chapter 4
Configuring the Hub for Management
Setting the IP Address Using VT100............................................................................4-1
Setting the IP Address Using a BOOTP Server............................................................4-7
Chapter 5
Managing the Hub
Management Features...................................................................................................5-1
Management Interface ..................................................................................................5-1
SNMP Management......................................................................................................5-3
Supported MIBs.....................................................................................................5-3
Supported Frame Types.........................................................................................5-3
IP Frame Types......................................................................................................5-4
IP Protocols ...........................................................................................................5-6
IPX Frame Type ....................................................................................................5-7
IPX Protocols.........................................................................................................5-9
SLIP Protocols.....................................................................................................5-10
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Traps.................................................................................................................... 5-11
RMON Support...........................................................................................................5-13
Statistics Group....................................................................................................5-13
History Group......................................................................................................5-14
Alarm Group........................................................................................................5-15
Event Group.........................................................................................................5-16
Firmware Updates.......................................................................................................5-17
Download Problems ............................................................................................5-18
Parameters Stored in NVRAM...................................................................................5-19
Compaq Specific Parameters......................................................................................5-20
Appendix A
Specifications
Physical........................................................................................................................A-1
Electrical...................................................................................................................... A-1
Environmental..............................................................................................................A-1
xi
Appendix B
Using the VT100 Interface
Connecting the Hub for VT100................................................................................... B-1
Setting Up the Communications Program.................................................................. B-1
Starting the VT100 Interface....................................................................................... B-2
Basic Update Fields.............................................................................................. B-4
VT100 Management Options....................................................................................... B-5
Displaying a Data Screen............................................................................................. B-6
Navigating the VT100 Screens.................................................................................... B-6
Viewing System Information....................................................................................... B-8
Viewing the Management Agent Configuration........................................................ B-10
Viewing Port Statistics .............................................................................................. B-12
Viewing the Stack Configuration .............................................................................. B-13
Viewing and Editing the Backup Port Configuration................................................ B-15
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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xii
Changing the Password.............................................................................................. B-17
Downloading Firmware............................................................................................. B-19
Setting Up the Serial Port.......................................................................................... B-21
Configuring User Access........................................................................................... B-23
Configuring IP User Access............................................................................... B-24
Configuring IPX User Access ............................................................................ B-28
Logging Out of the Management Session................................................................. B-30
Index
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1-1
Chapter 1
Overview
The Netelligent 2724 and 2824 Dual-Speed hubs feature a 10Base-T and a
100Base-TX repeater in each unit connected by an internal two-port 10/100
Mb/s switch. Each of the hubs’ 24 RJ-45 ports automatically detects and adjusts
to 10 Mb/s or 100 Mb/s port connection speeds. This makes the hub a perfect
solution for networks migrating from 10 Mb/s to 100 Mb/s, allowing you to
move from 10 Mb/s to 100 Mb/s speeds on a port-by-port basis. The 100 Mb/s
repeater is a 100Base-TX Class I repeater.
The 2824 hub is a managing hub, which means it contains a built-in
management agent.
The 2724 hub is a manageable hub, which means it does not contain a
management agent but can be managed by a hub that does contain a
management agent (2624 or 2824 hub, provided they are running v2.0 or higher
management firmware). To be managed by a managing hub, the 2724 must be
connected to a managing hub’s connectors on its back panel. Up to five hubs
(one managing 2824 or 2624 and four manageable 2524 or 2724) can exist in a
single stack for a total of up to 125 ports (with SUMs installed).
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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Overview
1-2
Features
The 2724/2824 hub provides the following set of features:
24 RJ-45 ports allows 10 Mb/s or 100 Mb/s connections by autodetecting
the wire speed.
Stackable lets you stack up to five hubs (four manageable 2724 hubs and
one managing 2824 hub) for up to 125 workstation connections. You can also
interconnect the 2724/2824 hubs with Netelligent 2524/2624 hubs.
Host/Target Design allows manageable hubs (Model 2724) to be managed
by a single managing hub (Model 2824)
24 Bi-Colored LED Indicators show port activity, port link, and port
disable/auto partition; other LEDs show collisions, the power supply status, and
the management status of the hub and the mode (10 or 100).
Backup Ports provide redundant port connections for mission-critical
applications (for example, order entry PCs connected to a file server).
Intrusion Detection provides a method of preventing unauthorized stations
from transmitting on the network.
Field-Upgradable Firmware lets you upgrade the 2824 hub firmware using
XMODEM and TFTP downloads via the BOOTP/TFTP sequence, the VT100
interface, or through SNMP. VT100 and SNMP can occur through both in-band
and out-of-band (SLIP) connections.
4-group RMON (Groups 1, 2, 3 & 9) allows remote monitoring and
gathering of network statistics without generating network traffic.
Compaq Netelligent Management Software provides an easy-to-use
graphical interface for managing the hub.
SNMP management over IP and IPX lets you monitor and manage the
hub via any industry-standard SNMP application, such as Compaq Netelligent
Management Software (provided at no extra charge with each unit).
VT100 interface allows out-of-band (serial port) and in-band (Telnet)
management for setting numerous configuration parameters.
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Rack Mount Kit lets you install the hub in a standard EIA 19-inch
equipment rack.
10/100 Switch Enable/Disable lets you enable or disable the internal 10/100
switch if the network uses an external bridge or router.
Multicast/Broadcast Filtering allows the hub to forward or block multicast
and broadcast packets independently on both the 10 and 100 Mb/s segments.
Statistics Separate statistics, similar to those available on the 10 and 100
Mb/s repeater ports, are available for both the 10 and 100 Mb/s ports on the
2-port 10/100 switch.
Smart Uplink Module Support allows the 2724/2824 hub to uplink to
another 2724/2824 hub to overcome the single repeater hop restriction for
Class I 100Base-T repeaters.
IP/IPX Autodiscovery allows the hub to be autodiscovered by network
management platforms such as Novell ManageWise, HP OpenView, SunNet
Manager, IBM NetView 6000.
1-3
Fast Ethernet Wiring Standards ensures compatibility with all types of
UTP cabling.
Three-Year Limited Warranty
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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1-4 Overview
Package Contents
Before you start to install the hub, verify that this package contains the
following items:
■
Netelligent 2724 or 2824 Dual-Speed Hub
■
AC power cord
■
Rack-mounting kit (two mounting brackets, eight 3/8-inch bracket
screws, and four 1/2-inch rack-mount screws)
■
Four adhesive-backed rubber feet
■
Compaq Netelligent Management Software
■
Compaq Netelligent 2724/2824 Dual-Speed Hub Quick Install Guide
■
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide CD
■
Safety compliance guide
■
Registration card
Figure 1-1.
P
ackage Contents
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Hub Components
This section provides an overview of the hub's components including the LED
indicators, RJ-45 ports, and fiber ports. Figure 1-2 shows the hub’s front panel.
1-5
Figure 1- 2.
RJ-45 Ports
The hub’s RJ-45 ports allow connections to UTP cabling to workstations and
servers in a 10Base-T or 100Base-TX network. The hub automatically detects
the wire speed and adjusts accordingly. You can force Port 1 to run at 10 Mb/s
by setting the 10 Mb/s ONLY / 10/100 switch on the front panel to 10 ONLY.
You can also use Port 1 as an uplink port by setting the MDI / MDI-X switch to
the MDI position. See “MDI / MDI-X Switch” and “10 Mb/s ONLY / 10/100
Switch” for more information.
Smart Uplink Slot
The Smart Uplink slot houses an optional Smart Uplink Module (SUM), which
serves as a connection point between hubs, hub stacks, and other manufacturers'
100Base-TX, 100Base-TX(SC), 100Base-TX(ST) hubs or stacks. Smart Uplink
modules let you extend your network without the usual repeater hop limitations
inherent with Class I repeaters.
2724/2824 Hub Front Panel with Smart Uplink Module Installed
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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Overview
1-6
Figure 1- 3.
The SUM provides two status LEDs: activity and collision. The activity LED is
a solid green when the link is active and flashes green when there is activity on
the port. The collision LED flashes yellow when a collision is detected and
lights solid yellow when the port is disabled. The collision LED does not reflect
conditions at the SUM’s hub port, only at the external interface port.
LED Indicators
The LED panel of the 2724/2824 hub helps you monitor the hub’s operation.
When you power on a hub, it performs a power-on self test (POST) which lasts
about 1 minute. After the POST, all LEDs reflect the current operational modes
which are described in Table 1-1.
Smart Uplink Modules
Figure 1- 4.
Hub Status LEDs
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Table 1-1
2724/2824 LEDs
LED Status and Description
The power supply is operating properly.
POWER
Green
The hub is not powered on.
Off
1-7
STATUS
10 COL (Collision)
2824 Managing Hub:
A basic failure occurred where the firmware agent cannot execute code
Off
or the LED control cannot be accessed
The firmware agent is in the process of booting up and is not ready
Yellow
for management processing.
Flashing Yellow
LED is yellow for one second and off for one second.
Flashing Yellow/Green
hardware error such as an NVRAM failure or internal 2-port 10/100 switch
failure. The LED is yellow for one second and green for one second.
The firmware agent has finished booting and is now ready for any
Green
management processing.
2724 Manageable Hub (in a managed stack):
The hub is not being managed by the stacks managing hub. This
Off
indicates either a Host/Target switch misconfiguration or a hardware problem.
The STATUS indicator is always off if the 2724 hub is in an unmanaged stack.
Flashing Green
(unmanaged). The LED is green for one second and off for one second.
Flashing Yellow/Green
hardware error such as an internal 2-port 10/100 switch failure. The LED is
yellow for one second and green for one second.
The hub is properly configured and is being managed by the stacks
Green
managing hub.
Flashing Yellow
No collisions on the segment
OFF
The firmware encountered a failure during the POST. The
The hub is operational, but the agent detected a
The hub has its MAN/UNM switch set to UNM
The hub is operational, but the agent detected a
Collisions on the 10 Mb/s segment
100 COL (Collision)
Flashing Yellow
No collisions on the segment
OFF
Collisions on the 100 Mb/s segment
continued
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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Overview
1-8
LED Status and Description
10/100 SW (Switch)
100 BP (Backplane)
ALT (Alternating)
Flashing Yellow
overflows, address table full
Internal 10/100 switch is enabled
Green
Internal 10/100 switch is disabled; 10 Mb/s segment is isolated
OFF
100 Mb/s connected to a 100 Mb/s backplane
Green
100 Mb/s isolated from the 100 Mb/s backplane
OFF
Port LEDs alternate between 10 Mb/s and 100 Mb/s status
Green
Alternating mode off
OFF
Internal 10/100 switch problems, such as buffer
Mode button
100 MBPS (Management Port)
10 MBPS (Management Port)
Activity
Collision
Serial COM Port
The 2824 (managing) hub contains a serial COM port that uses a DB9
connector with a standard AT pinout. This port lets you perform the following
operations:
■
XMODEM firmware downloads
■
VT100 console interface for basic management and initially setting the
IP address
Disables the alternating mode and selects 10/100 port LED display
Port LEDs show 10 Mb/s status
Green
Port LEDs do not show 10 Mb/s status
OFF
Port LEDs show 100 Mb/s status
Green
Port LEDs do not show 100 Mb/s status
OFF
Smart Uplink Module (SUM-TX)
Flashing Green
Link active, no traffic on the module
Green
No link
OFF
Flashing Yellow
No collisions
OFF
100 Mb/s traffic occurring on the module
Collisions on the module
■
SLIP (Serial Line Internet Protocol) transfers, including remote (out-ofband) management, SNMP, Telnet, and TFTP firmware downloads.
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See Chapter 4 “Configuring the Hub for Management” and Appendix B “Using
the VT100 Interface” for more information about the serial port.
Host/Target DIP Switch
On the back panel of the 2724 hub is a HOST/TARGET DIP switch that
determines whether the hub is a host or target hub in a hub stack. For example,
you can connect up to two 2724 hubs and designate one as the host and the
other hub as a target for an unmanaged stack. Or, if you have a managing hub
(2824) in the stack, you can set up to four 2724 manageable hubs as target hubs
for a managed stack. The 2824 hub does not have a HOST/TARGET DIP
switch.
: There may be only one host hub in a stack. More than one host hub prevents
NOTE
the stack from passing Ethernet traffic or management commands between units.
1-9
Figure 1- 5.
2724 Hub DIP Switches
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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Overview
1-10
Managed/Unmanaged DIP Switch
On the back panel of the 2724 hub is a MAN/UNM DIP switch that sets the
hub’s initial 100 Mb/s port enable/disable and backplane connection status.
When the switch is set to “MAN,” the hub sets the initial 100 Mb/s port
enable/disable and backplane connection status. When the switch is set to
“UNM,” the initial 100 Mb/s port and backplane status is set to the hardware
default (enabled). The 2824 hub does not have a MAN/UNM DIP switch.
: When a managing hub is present, it can set port statuses regardless of the
NOTE
switch setting.
Internal 10/100 Switch Disable DIP Switch
The internal 10/100 switch disable DIP switch, located on the back panel of the
2724 hub, lets you disable the internal two-port switch. When you set the switch
to “SW DIS,” the internal switch is disabled, preventing 10 Mb/s packets from
being forwarded to the 100 Mb/s segment and vice-versa. This effectively
isolates the 10 Mb/s segment and disables connectivity to the management
agent. When you set the switch to “SW EN,” the internal switch allows packets
to be forwarded between the 10 Mb/s and 100 Mb/s segments, unless the switch
is disabled by the management agent.
If you set the DIP switch to “SW EN,” you can enable and disable the switch
using the n2feTen100SwEnable MIB variable. However, if you set the DIP
switch to “SW DIS,” the hardware disables the bridge, which the management
agent cannot change.
You can view the status of the internal switch in the Netelligent 2000/FE (Fast
Ethernet) MIB variable n2feTen100SwHardwareDisableSwitchStatus.
10 ONLY - 10/100 Switch
The 10 ONLY - 10/100 switch, located on the front panel of both 2724 and
2824 hubs, lets you set the allowable connection types for Port 1. When you set
the switch to “10 ONLY,” Port 1 allows 10 Mb/s connections only. When you
set the switch to “10/100,” Port 1 allows 10 Mb/s or 100 Mb/s connections.
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1-11
If the switch is set to “10/100,” you can force 10 Mb/s connections using the
n2fePortAutoNegCapAdvertised MIB variable. However, if the switch is set to
“10 ONLY,” the hardware forces the connection speed and cannot be changed
by the management agent. To view the status of this switch, see the
n2feForce10 Mb/sSwitchStatus MIB variable.
: This switch must be set to 10 ONLY if you set the 10 MDI / 10/100 MDI-X
NOTE
switch to 10 MDI.
Figure 1- 6.
Port 1 Switches
10 MDI - 10/100 MDI-X Switch
The 10 MDI / 10/100 MDI-X switch is located on the front panel of the 2724
and 2824 hubs. This switch lets you set Port 1 as an MDI 10Base-T (uplink)
port (for connecting to another hub) or as an MDI-X port (for connecting
directly to a network controller card). The 10 MDI setting is for 10Base-T
connections only.
: If you set this switch to 10 MDI, be sure the 10 ONLY - 10/100 switch is set
NOTE
to 10 ONLY.
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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Overview
1-12
Segmentation
A segment is a single collision domain where all network traffic within that
domain contends for the same bandwidth. The Netelligent 2724/2824 hub has a
10 Mb/s segment and a 100 Mb/s segment that are connected via an internal
two-port (10 Mb/s / 100 Mb/s) switch. The process of segmentation lets you
isolate the 10 Mb/s segment from the 100 Mb/s segment, which prevents packet
forwarding between the two segments and isolates the hub’s 10 Mb/s segment
from the common 100 Mb/s backplane. This can improve the bandwidth in your
network by reducing the number of nodes that contend for the same segment
thereby reducing collisions. For information about isolating the
10 Mb/s segments, see “Internal 10/100 Switch Disable DIP Switch.”
You can also isolate the hub’s 100 Mb/s segment from the common 100 Mb/s
backplane in a stack. To do so, view the Stack Configuration screen of the
VT100 interface and set the Backplane Status field to “Isolated” (see “Appendix
B – Using the VT100 Interface” for more information). Or, set the
n2feBkplnStatus MIB variable using a MIB browser or SNMP management
application such as Compaq Netelligent Management Software.
All 2824/2724 ports have access to the management agent regardless of
connection speed as long as they have access to the stack’s common 100 Mb/s
backplane. When any hub’s internal 10/100 switch is disabled, its 10 Mb/s
connections lose their access to the agent. When a manageable hub (2724) is
isolated from the common 100 Mb/s backplane, all ports lose their access to the
management agent. 100 Mb/s connections on the managing (2824) hub always
have access to the agent, regardless of the hub’s configuration.
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2-1
Chapter 2
Planning Installation
This chapter contains installation requirements and system planning charts that
will help you prepare for installing the hub.
Installation Requirements
To help ensure a correct installation, read this section to determine the
environmental, electrical, spatial, and cable requirements.
Environmental Requirements
Be sure the operating environment for the hub is within the following ranges:
■
Temperature: 32° to 104° F (0° to 40° C)
■
Humidity: 5% to 95% (non-condensing)
■
Altitude: 0 to 10,000 feet (0 to 3 km)
■
Clearance: minimum of 2 inches (5.1 centimeters) on each side of the
hub (for proper ventilation)
Electrical Requirements
The electrical requirements for the hub are as follows:
■
Voltage: 100 to 240 VAC
■
Power: 2.0A (@ 100 VAC) to 1.0A (@ 240 VAC)
■
Frequency: 50 to 60 Hz
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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Planning Installation
2-2
CAUTION:
grounded outlet. Do not use a three-to-two pronged adapter at the outlet.
Doing so may result in electrical shock and/or damage to the hub and will
void your warranty.
Spatial Requirements
The hub dimensions are 2.5 x 17 x 13.5 inches, 6.4 x 43.6 x 34.6 cm (HxWxD).
Be sure to allow at least 2 inches (5.1 centimeters) on each side of the hub for
proper air circulation and cable connections.
Cable Requirements
The following information states the required cable type and distance
limitations for 10Base-T, 100Base-TX, and 100Base-FX.
10Base-T
The 10Base-T twisted-pair wiring you connect to the hub’s RJ-45 ports must
meet the following minimum specifications and requirements to ensure longterm LAN reliability.
■
The wiring must be unshielded twisted-pair (UTP), Category 3 or better.
The power outlet must be a non-switched, three-pronged,
■
Two pairs of wiring are required.
■
The building codes may require different insulation materials.
■
The wire gauge should be between 18 and 26 AWG. (Most telephone
installations use 24-gauge wiring.)
■
UTP wire should meet the following requirements:
Solid copper
Nominal capacitance: less than 16 pF/ft
Nominal impedance: 100 Ohms
Nominal attenuation: less than 11.5 db
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2-3
100Base-TX
100Base-TX is the IEEE 802.3u specification for transmitting 100 Mb/s
Fast Ethernet over two pairs of copper wire. The pinout, connectors (RJ-45
modular plugs), and protocol (CSMA/CD) are exactly the same as
for 10Base-T.
Unshielded Twisted Pair (UTP)
■
Category 5 only
■
Two pairs used (same as 10Base-T)
■
Maximum 100-meter (328-foot) link
Figure 2-1 shows a one-to-one cable pinout for 100Base-TX.
Figure 2- 1.
NOTE:
One-to-One Cable Pinout for 100Base-TX
To prevent potential electromagnetic interference, terminate the unused
wires (4, 5, 7, and 8).
Tables 2-1 and 2-2 show the wiring for straight-through and crossover twistedpair cable.
Table 2- 1
Straight-Through Twisted-Pair Wiring
Twisted Pair Number Pin Number Signal
Description
11
2
23
6
TD+
TD-
RD+
RD-
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
To Pin Number Signal
Description
➔
➔
➔
➔
1
2
3
6
TD+
TD-
RD+
RD-
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Planning Installation
2-4
Table 2-2
Crossover Twisted-Pair Wiring
Twisted Pair Number Pin Number Signal
Description
11
2
23
6
TD+
TD-
RD+
RD-
To Pin Number Signal
Description
➔
➔
➔
➔
3
6
1
2
RD+
RD-
TD+
TD-
100Base-FX
100Base-FX is the IEEE 802.3u specification for transmitting 100 Mb/s Fast
Ethernet over two strands (one pair) of fiber optic cable. The 2724/2824 hub
supports both SC type (low-cost fiber optic interface connector) and ST (optical
medium connector plug and socket) connections.
Cable Type
■
Fiber optic
■
Multi-mode 62.5/125 to 100/150 micron fiber
■
Both strands used
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2-5
System Planning Charts
The charts in Figures 2-2 and 2-3 provide a convenient way of planning the
connections for your hub.
Figure 2- 2.
Hub Setup and Cabling Chart
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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Planning Installation
2-6
Figure 2- 3
. Rack Inventory Chart
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3-1
Chapter 3
Installing the Hub
This chapter explains how to mount the hub, attach cables, and connect power.
Mounting the Hub
You can place the hub on a level surface (table top or shelf, for example) or
mount it in a standard EIA 19-inch rack.
Attaching the Rubber Feet
If you will place the hub on a table top or shelf, attach the supplied adhesivebacked rubber feet, as described in the following steps.
1. Turn the hub over so that its bottom side faces up.
2. Remove the four rubber feet from their packaging.
3. Peel the protective paper backing off the rubber feet. Then position the
feet in the recessed areas near the corners of the hub and press the feet
into place.
4. Turn the hub to its upright position and place it on the
mounting surface.
: Be sure you allow at least 2 inches (5 cm) on each side of the hub for proper
NOTE
air flow.
Rack-Mounting the Hub
The hub occupies 1 ½ slots in a standard 19-inch rack. To mount the hub in a
rack, use the supplied installation kit. This kit includes two side mounting
brackets, eight bracket screws, and four larger rack-mount screws.
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
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Installing the Hub
3-2
To attach the brackets, follow these steps:
1. Remove the two screws from the left and right side of the hub. (These
screws are extras and are not needed to install the
mounting brackets.)
2. Position the bracket as shown in Figure 3-1 and secure it with the
smaller bracket screws. Then attach the remaining bracket to the other
side of the hub.
Figure 3- 1.
3. After you attach both mounting brackets, position the bracket slots over
Figure 3- 2.
Attaching the Mounting Brackets
the desired holes on the rack (Figure 3-2). Then insert and tighten the
supplied rack-mount screws.
Positioning the Hub in a Rack
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