HP ProCurve 2124 User manual

hp procurve
switch 2124
installation guide
www.hp.com/go/hpprocurve

HP Procurve
Switch 2124
Installation Guide

Hewlett-Packard Company
8000 Foothills Boulevard, m/s 5552
Roseville, California 95747-5552
http://www.hp.com/go/hpprocurve
© Copyright 2001 Hewlett-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
J4868-90001
June 2001
Applicable Products
HP Procurve Switch 2124 (HP J4868A)
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 THIS MATERIAL,
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 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 Customer Support/Warranty booklet included with
the product.
A copy of the specific warranty terms applicable to your
Hewlett-Packard products and replacement parts can be
obtained from your HP Sales and Service Office or
authorized dealer.
Safety
Before installing and operating this product, please read the
“Installation Precautions” in chapter 2, “Installing the Switch
2124”, and the safety statements in appendix C, “Safety and
EMC Regulatory Statements”.

iii
Contents
1 Introducing the HP Procurve Switch 2124
Front of the Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Network Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Reset Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
LED Mode Select Button and Indicator LEDs . . . . . . . . . . . . . . . . . . . . 1-4
Back of the Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Power Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Switch Operation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Address Table Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2 Installing the Switch 2124
Included Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Installation Precautions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
1. Prepare the Installation Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2. Install An Optional Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
3. Verify the Switch Operates Correctly . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
4. Mount the Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
5. Connect the Switch to a Power Source . . . . . . . . . . . . . . . . . . . . . . 2-12
6. Connect the Network Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Example Network Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
As a Desktop Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
As a Segment Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Connecting to a Backbone Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

iv
3 Troubleshooting
Basic Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Diagnosing with the LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Hardware Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Testing the Switch by Resetting It . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Testing Twisted-Pair Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Testing End-to-End Network Communications . . . . . . . . . . . . . . . . . . 3-6
HP Customer Support Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
A Specifications
Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Acoustic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
B Switch Ports and Network Cables
Switch Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Twisted-Pair Cable/Connector Pin-Outs . . . . . . . . . . . . . . . . . . . . . . . B-2
Straight-Through Twisted-Pair Cable for
10 Mbps or 100 Mbps Network Connections . . . . . . . . . . . . . . . . . . . . B-4
Crossover Twisted-Pair Cable for
10 Mbps or 100 Mbps Network Connection . . . . . . . . . . . . . . . . . . . . . B-5
C Safety and EMC Regulatory Statements
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
EMC Regulatory Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
Index

1-1
Introducing the HP Procurve
Switch 2124
1
Introducing the HP Procurve Switch 2124
The HP Procurve Switch 2124 is a multiport switch that can be used to build
high-performance switched workgroup networks. This switch is a store-and-
forward device that offers low latency for high-speed networking.
Throughout this manual, this switch will be abbreviated as the Switch 2124.
The Switch 2124 has 24 auto-sensing 10/100Base-TX RJ-45 ports, and a slot for
installing an HP 100-FX SC Transceiver (HP J4853A).
You can directly connect end node devices such as computers, printers, and
servers to this switch, providing dedicated bandwidth to those devices. You
can also connect this switch to hubs, other switches, or routers as part of your
network infrastructure.
This chapter describes your HP Switch 2124 including:
■Front and back of the switch
■Features
■Switch operation overview
HP Procurve Switch 2124 (HP J4868A)

1-2
Introducing the HP Procurve Switch 2124
Front of the Switch
Introducing the HP Procurve
Switch 2124
Front of the Switch
Network Ports
■24 auto-sensing 10/100Base-TX RJ-45 ports
All these ports have the “HP Auto-MDIX” feature, which means that you
can use either straight-through or crossover twisted-pair cables to
connect any network devices to the switch.
■One transceiver slot for installing the HP 100-FX SC Transceiver
(HP J4853A)
Reset Button
This button is used to reset the switch while it is powered on. This action
executes the switch self test, and may clear certain error conditions that have
occurred.
Power
LED
Fault
LED
10/100Base-TX RJ-45 ports
LED Mode Select button
and indicator LEDs
Reset button
Slot for
HP 100-FX SC Transceiver
Link and
Mode LEDs
for each
port
All 10/100Base-TX RJ-45 ports have the “HP Auto-MDIX” feature

1-3
Introducing the HP Procurve Switch 2124
Front of the Switch
Introducing the HP Procurve
Switch 2124
LEDs
Table 1-1. Switch LEDs
Switch LEDs State Meaning
Power
(green)
On The switch is receiving power.
Off The switch is NOT receiving power.
Fault
(orange)
Off The normal state; indicates that there are no fault conditions on the switch.
Blinking* An unsupported transceiver has been installed in the transceiver slot. Under this
condition, the Port 25 Link LED will also blink simultaneously.
On On briefly after the switch is powered on or reset, at the beginning of switch self test.
If on for a prolonged time, the switch has a hardware failure, or has failed its self test.
See chapter 3, “Troubleshooting” for more information.
Link
(green –
overlaid with
the port
number)
On Indicates the port is enabled and receiving a link indication from the connected
device.
Off One of these conditions exists:
• no active network cable is connected to the port
• the port is not receiving link beat (RJ-45 ports), or sufficient light (transceiver port)
• for Port 25 (transceiver port), the transceiver has failed
Blinking*
(Port 25 only)
If the Port 25 Link LED is blinking simultaneously with the Fault LED, it indicates that
an unsupported transceiver has been installed in the transceiver slot.
Mode
(green)
Displays network activity information, or whether the port is configured for full-duplex operation, or
100 Mbps operation depending on the mode selected. See “LED Mode Select Button and Indicator
LEDs” on the next page for more information.
LED Mode
Select
indicators
(3 green LEDs)
Act Indicates that the port Mode LEDs are displaying network activity information.
FDx Indicates that the port Mode LEDs are lit for ports that are in Full Duplex Mode.
100 Indicates that the port Mode LEDs are lit for ports that are operating at 100 Mbps.
* The blinking behavior is an on/off cycle once every 1.6 seconds, approximately.

1-4
Introducing the HP Procurve Switch 2124
Front of the Switch
Introducing the HP Procurve
Switch 2124
LED Mode Select Button and Indicator LEDs
To optimize the amount of information that can be displayed for each of the
switch ports without overwhelming you with LEDs, the Switch 2124 uses a
Mode LED for each port. The operation of this LED is controlled by the LED
Mode Select button, and the current setting is indicated by the Mode indicator
LEDs near the button. Press the button to change from one mode to the next.
■If the Activity (Act) indicator LED is lit, the Mode LED for each port
displays activity information for the port — it flickers as network traffic
is received and transmitted through the port.
■If the Full Duplex (FDx) indicator LED is lit, the Mode LEDs light for those
ports that are operating in full duplex.
■If the 100 Mbps (100) indicator LED is lit, the Mode LEDs light for those
ports that are operating at 100 Mbps.
Mode LEDs
(one per port)
LED Mode Select button
and indicator LEDs

1-5
Introducing the HP Procurve Switch 2124
Back of the Switch
Introducing the HP Procurve
Switch 2124
Back of the Switch
.
Power Connector
The Switch 2124 does not have a power switch; it is powered on when
connected to an active AC power source. The switch automatically adjusts to
any voltage between 100--240 volts and either 50 or 60 Hz. There are no voltage
range settings required.
AC power connector
cooling vent - make sure this is not
obstructed for proper switch operation

1-6
Introducing the HP Procurve Switch 2124
Features
Introducing the HP Procurve
Switch 2124
Features
The features of the Switch 2124 include:
■24 auto-sensing 10/100Base-TX RJ-45 ports with “HP Auto-MDIX”
■a slot for installing an HP 100-FX SC Transceiver (HP J4853A)
■plug-and-play networking — all ports are enabled — just connect the
network cables to active network devices and your switched network is
operational
■“HP Auto-MDIX” on all 10/100 twisted-pair ports, meaning that all
connections can be made using straight-through twisted-pair
cables. Cross-over cables are not required, although they will also work.
The pin operation of each port is automatically adjusted for the attached
device: if the switch detects that another switch or hub is connected to
the port, it configures the port as MDI; if the switch detects that an end-
node device is connected to the port, it configures the port as MDI-X.
■automatic learning of the hardware addresses in the switch’s 4000-entry
address forwarding table
■automatically negotiated full-duplex operation for the fixed 10/100 RJ-45
ports when connected to other auto-negotiating devices — the transceiver
port always operates at full duplex.
■auto-negotiation of flow control for ports operating at full duplex
Switch Operation Overview
Address Table Operation
Address Learning. As devices are connected to the switch ports, either
directly or through hubs or other switches that are connected to the switch,
the MAC addresses of those devices are learned automatically and stored in
the Switch 2124’s 4000-entry address table. The switch also identifies the
number of the port on which each address is learned so it knows the relative
network location of each device.

1-7
Introducing the HP Procurve Switch 2124
Switch Operation Overview
Introducing the HP Procurve
Switch 2124
Forwarding, Filtering, Flooding. When the switch receives a packet, it
determines the destination address, and looks for the address in the address
table. Based on the port location of that address, the switch then determines
whether to forward, filter-out, or flood the packet.
■forward - if the destination address is on a different port than the one on
which the packet was received, the packet is forwarded to the destination
port and on to the destination device.
■filter out - if the destination address is on the same port as the one on
which the packet was received, the packet is filtered out. The switch
thereby isolates local traffic so the rest of the network connected to the
switch does not use bandwidth dealing with unnecessary traffic.
■flood - whenever a new destination address is found in a packet received
on a port, the destination address will not yet be in the switch’s address
table and the Switch 2124 cannot know whether to forward or filter out
the packet. In this case, it sends the packet to all the other switch ports.
This is referred to as “flooding”. When the destination device receives the
packet, it replies, and the switch learns the new address from the reply
packet. Then, all future packets destined for that address are forwarded
or filtered out appropriately.
Network Moves and Changes. When devices are moved in the network,
and become connected to a different switch port, the Switch 2124 automati-
cally recognizes the change and updates the address table with the new port
location of the device. Communication with the device is automatically main-
tained, without any address table manipulation being required.

2-1
Installing the Switch 2124
2
Installing the Switch 2124
The HP Switch 2124 is easy to install. It comes with an accessory kit that
includes the brackets for mounting the switch in a standard 19-inch telco rack
or an equipment cabinet, or on a wall, and with rubber feet that can be attached
so the switch can be securely located on a horizontal surface. The brackets
are designed to allow mounting the switch in a variety of orientations.
This chapter shows you how to install your Switch 2124.
Included Parts
The Switch 2124 has the following components shipped with it:
■HP Procurve Switch 2124 Installation Guide (J4868-90001), this manual
■Customer Support/Warranty booklet
■Accessory kit (5064-2085)
•two mounting brackets
•four 8 mm M4 screws to attach the mounting brackets to the switch
•four 5/8-inch number 12-24 screws to attach the switch to a rack
•four rubber feet
■Power cord, one of the following:
Australia/New Zealand
China
Continental Europe
Denmark
Japan
Switzerland
United Kingdom/Hong Kong/Singapore
United States/Canada/Mexico
8120-6803
8120-8377
8120-6802
8120-6806
8120-6804
8120-6807
8120-8709
8120-6805

2-2
Installing the Switch 2124
Installation Procedures
Installing the Switch 2124
Installation Procedures
Summary
Follow these easy steps to install your switch. The rest of this chapter provides
details on these steps.
1. Prepare the installation site. Make sure that the physical environment
into which you will be installing the switch is properly prepared including
having the correct network cabling ready to connect to the switch, and
having a good location for the switch. Please see page 2-3 for some
installation precautions.
2. (Optional) Install the transceiver. The Switch 2124 has a slot for
installing an HP 100-FX SC Transceiver (HP J4853A). Depending on
where you will locate the Switch 2124, it may be easier to install the
transceiver first.
3. Verify that the switch passes its self test. This is a simple process of
plugging the switch into a power source and observing that the LEDs on
the switch’s front panel show correct operation. See page 2-7.
4. Mount the switch. The Switch 2124 can be mounted in a 19-inch telco
rack or equipment cabinet, on a wall, or on a horizontal surface.
5. Connect power to the switch. Once the switch is mounted, plug it in
to the nearby AC power source.
6. Connect the network devices. Using the appropriate network cables,
connect computers, printers, servers, hubs, other switches, routers, and
other network devices to the switch ports.
At this point, the switch is fully installed and your network should be up and
running. See the rest of this chapter if you need more detailed information on
any of these installation steps.

2-3
Installing the Switch 2124
Installation Procedures
Installing the Switch 2124
Installation Precautions:
Follow these precautions when installing your HP Switch 2124.
Warning ■The rack or cabinet should be adequately secured to prevent it from
becoming unstable and/or falling over.
Devices installed in a rack or cabinet should be mounted as low as
possible, with the heaviest device at the bottom and progressively
lighter devices installed above.
Cautions ■Make sure that the power source circuits are properly grounded, then
use the power cord supplied with the switch to connect it to the power
source.
■If your installation requires a different power cord than the one supplied
with the switch, be sure the cord is adequately sized for the switch’s
current requirements. In addition, be sure to use a power cord displaying
the mark of the safety agency that defines the regulations for power
cords in your country. The mark is your assurance that the power cord
can be used safely with the switch.
■When installing the switch, note that the AC outlet should be near the
switch and should be easily accessible in case the switch must be powered
off.
■Ensure that the switch does not overload the power circuits, wiring,
and over-current protection. To determine the possibility of overloading
the supply circuits, add together the ampere ratings of all devices
installed on the same circuit as the switch and compare the total with
the rating limit for the circuit. The maximum ampere ratings are usually
printed on the devices near the AC power connectors.
■Do not install the switch in an environment where the operating
ambient temperature might exceed 55C (131F).
■Make sure the air flow around the sides and back of the switch is
not restricted.
■Make sure that if no transceiver is installed in the transceiver slot, the
cover plate is installed to cover the slot. A cover plate is required for
safe operation, and to ensure proper switch cooling.

2-4
Installing the Switch 2124
Installation Procedures
Installing the Switch 2124
1. Prepare the Installation Site
■Cabling Infrastructure - Ensure that the cabling infrastructure meets
the necessary network specifications. See the following table for cable
types and lengths, and see appendix B, “Switch Ports and Network
Cables”for more information:
Table 2-1. Summary of Cable Types to Use with the Switch
■Installation Location - Before installing the switch, plan its location and
orientation relative to other devices and equipment:
•At the front of the switch, leave at least 7.6 cm (3 inches) of space for
the twisted-pair and fiber-optic cabling.
•At the back of the switch, leave at least 7.6 cm (3 inches) of space for
the power cord and cooling.
•On the sides of the switch, leave at least 3.8 cm (1 1/2 inches) for
cooling.
Port Type Cable Type Length Limits
10/100Base-TX • 10 Mbps operation:
Category 3, 4, or 5, 100-ohm differential
unshielded twisted-pair (UTP) or shielded
twisted-pair (STP).
• 100 Mbps operation:
Category 5, 100-ohm differential UTP or
STP.
100 meters.
Note: Since the 10Base-T operation is through
10/100Base-TX ports, if you ever want to upgrade
the ports to 100Base-TX, it would be best to cable
the ports initially with category 5 cable.
The 10/100-Base-TX ports on the Switch 2124
includethe”HPAuto-MDIX”feature, which allows
you to use either straight-through or crossover
twisted-pair cables for connecting to any network
devices including end nodes, such as computers,
or to other switches, hubs, and routers.
100Base-FX
for transceiver
connection
62.5/125 ←m or 50/125 ←m (core/cladding)
diameter, graded-index, multimode fiber-
optic cables, complying with the ITU-T G.651
and ISO/IEC 793-2 Type A1b or A1a
respectively, fitted with SC connectors.
2 kilometers for full-duplex connections.
(When installed in a Switch 2124, the HP 100-FX SC
Transceiver operates only in full-duplex mode.)

2-5
Installing the Switch 2124
Installation Procedures
Installing the Switch 2124
2. Install An Optional Transceiver
Install an optional HP 100-FX SC Transceiver into the transceiver slot as
shown in the illustration below, or by following the instructions in the manual
that comes with the transceiver.
The slot cover can be removed with either a flat-bladed or Torx T-10 screw-
driver. Retain the slot cover for future use.
Transceiver
Notes
■Install only the HP J4853A 100-FX SC Transceiver into the transceiver slot
in the Switch 2124.
■Make sure the transceiver is fully installed and that you screw in the
retaining screws to secure the transceiver in place.
■If you do not install a transceiver in the slot, make sure that the slot cover
plate is still attached over the slot for safe operation and proper switch
cooling.
■In the Switch 2124, the transceiver can operate only at full duplex. Half
duplex operation is not supported.
Installing a Transceiver
Supported Transceiver Model: Install only the HP J4853A 100-FX SC
Transceiver into the transceiver slot.
1. Unplug the AC power from the switch.
2. Insert the transceiver into the guides and
slide it in until it stops.
3. Press in firmly until the transceiver is flush
with the face of the switch.
4. Tighten the retaining screws on the
transceiver until they are secure, but do not
overtighten them.
5. Plug the AC power back into the switch to
reboot the switch and initialize the
transceiver.

2-6
Installing the Switch 2124
Installation Procedures
Installing the Switch 2124
3. Verify the Switch Operates Correctly
After you have optionally installed a transceiver, but before mounting the
switch in its network location, you should first check that it is working
properly by plugging it into a power source and verifying that it passes its self
test.
1. Connect the power cord supplied with the switch to the power connector
on the back of the switch, and then into a nearby properly grounded
electrical outlet.
Note The Switch 2124 does not have a power switch. It is powered on when the
power cord is connected to the switch and to a power source. For safety, the
power outlet should be located near the switch installation.
The switch automatically adjusts to any voltage between 100-240 volts and
either 50 or 60 Hz. There are no voltage range settings required.
If your switch requires a different power cord than the one supplied with the
switch, please see the Installation Precautions on page 2-3.
2. Check the LEDs on the switch. The LED behavior is described on the next
page.
Connect power cord to
the power connector