Dell PowerConnect 2608 User manual

www.dell.com | support.dell.com
Dell™ PowerConnect™ 26 xx Switches
User’s Guide

Notes, Notices, and Cautions
NOTE: A NOTE indicates important information that helps you make better use of your computer.
NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to
avoid the problem.
CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.
____________________
Information in this document is subject to change without notice.
© 2003 Dell Inc. All rights reserved.
Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, Inspiron, Dell Precision, Dimension, OptiPlex, Latitude, PowerEdge,
PowerVault,PowerApp,Axim,DellNet, and PowerConnect are trademarks of Dell Inc.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or
their products. Dell Inc. disclaims any proprietary interest in trademarks and trade names other than its own.
Models PowerConnect 2608, PowerConnect 2616, PowerConnect 2624
October 2003 Rev. A00

Contents 3
Contents
1 Introduction
Package Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Front Panel Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Power (POWER) LED . . . . . . . . . . . . . . . . . . . . . . . . . 6
10/100/1000 Ports Link/Activity (SPD/LNK/ACT) LED . . . . . . . . . . . 6
10/100/1000 Ports Duplex Mode/Collisions (FDX/HDX) LED . . . . . . . . 6
Connecting Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
RJ-45 Switch Ports . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SFP Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting Switches to Each Other . . . . . . . . . . . . . . . . . . 8
Connecting Switches to Systems. . . . . . . . . . . . . . . . . . . . 9
Class-of-Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mounting Kit Instructions . . . . . . . . . . . . . . . . . . . . . . . . . 10
Installing the Switch on a Flat Surface . . . . . . . . . . . . . . . . . 10
Installing the Switch in a Rack . . . . . . . . . . . . . . . . . . . . . 10
Installing the Switch on a Wall . . . . . . . . . . . . . . . . . . . . . 11
Technical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2 Troubleshooting
3 Getting Help
Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Online Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
AutoTech Service . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Automated Order-Status Service. . . . . . . . . . . . . . . . . . . . 18
Technical Support Service. . . . . . . . . . . . . . . . . . . . . . . 19
Dell Enterprise Training and Certification . . . . . . . . . . . . . . . . . . 19
Problems With Your Order . . . . . . . . . . . . . . . . . . . . . . . . . 19
Product Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4Contents
Returning Items for Warranty Repair or Credit. . . . . . . . . . . . . . . . 19
Before You Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Contacting Dell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figures
Figure 1-1. PowerConnect 2608 . . . . . . . . . . . . . . . . 7
Figure 1-2. PowerConnect 2616 . . . . . . . . . . . . . . . . 7
Figure 1-3. PowerConnect 2624 . . . . . . . . . . . . . . . . 8
Figure 1-4. Cascading Switches . . . . . . . . . . . . . . . . 9
Figure 1-5. Brackets for Rack Installation . . . . . . . . . . . 11
Figure 1-6. Brackets for Wall Installation . . . . . . . . . . . 12
Tables
Table 1-1. Tag-Based Prioritization . . . . . . . . . . . . . . 9
Table 1-2. Specifications . . . . . . . . . . . . . . . . . 12
Table 2-1. Basic Troubleshooting . . . . . . . . . . . . . . 15

Introduction 5
1
Introduction
Dell ™ PowerConnect ™ 26 xx switches provide 10/100/1000-Mbps Gigabit Ethernet connectivity.
The switches have the following features:
• 10/100/1000-Mbps switch ports
– 8 ports (PowerConnect 2608)
– 16 ports (PowerConnect 2616)
– 24 ports, including one combination RJ-45/small form factor (SFP) port
(PowerConnect 2624)
• Complies with IEEE 802.3 10Base-T, IEEE 802.3u 100Base-TX, IEEE 802.3z/ab 1000Base-T
• Tag-based IEEE 802.1p Class-of-Service with two priority queues per port
• IEEE 802.3x PAUSE frames flow control in full-duplex operation
• Automatic negotiation for speed and full- and half-duplex mode on all ports
• Backpressure flow control in half-duplex operation
• Collision detection on all ports
• Auto MDI/MDIX
• 4K MAC address entries supported
• Comprehensive LED indicator panel to monitor overall switching condition
• 19-inch rackmountable and wallmountable, standard 1U chassis
• Internal power supply
Package Contents
Before you install a switch, verify that your package contains the following items:
•Switch
• Self-adhesive rubber pads for desktop installation
• Kit for 19-inch rack installation
• Kit for wallmount installation of 16- and 24-port switches
•
PowerConnect 26xx Switches CD
•ACpowercord

6Introduction
www.dell.com | support.dell.com
Front Panel Indicators
All 26 xx switches contain two rows of LEDS that provide information about connection speed, data
activity, and duplex operation mode.
Power (POWER) LED
• Green — The switch is powered on.
• Off — The switch is not powered on.
10/100/1000 Ports Link/Activity (SPD/LNK/ACT) LED
• Steady green — A 1000-Mbps link has been established, but no data is being transmitted or
received.
• Blinking green — A 1000-Mbps link has been established and data is being transmitted or
received.
• Steady amber — A 10-Mbps or 100-Mbps link has been established, but no data is being
transmitted or received.
• Blinking amber — A 10-Mbps or 100-Mbps link has been established and data is being
transmitted or received.
• Off — No link established.
10/100/1000 Ports Duplex Mode/Collisions (FDX/HDX) LED
• Steady green — The port is operating in full-duplex mode.
• Blinking green — Collisions are occurring on the port.
• Off — The port is operating in half-duplex mode.

Introduction 7
Figure 1-1. PowerConnect 2608
Figure 1-2. PowerConnect 2616
power LED
SPD/LNK/ACT LEDs
FDX/HDX LEDs
RJ-45 ports
RJ-45 ports
FDX/HDX LEDs
S
PD/LNK/ACT LEDs
power LED

8Introduction
www.dell.com | support.dell.com
Figure 1-3. PowerConnect 2624
Connecting Devices
RJ-45 Switch Ports
RJ-45 connectors are located on the front panel of the switch.
NOTE: Ensure that Category 5E (CAT 5E) cabling is used for connecting devices at 1000-Mbps Gigabit
Ethernet speed.
All ports can negotiate full- and half-duplex modes automatically. These switching ports allow users
to connect the switches to 10Base-T, 100Base-TX and 1000Base-T devices.
SFP Port
On the 24-port switch, you can use the SFP port to connect to a device that is more than
100 meters away. However, using the SFP port disables the RJ-45 connector of port 24 on the
switch.
Connecting Switches to Each Other
Each port supports Auto MDI and MDIX functionality. When cascading with other switches or
hubs, each port can connect directly to a switch or hub with straight-through twisted-pair cable
(see Figure 1-4).
RJ-45 ports
power LED
FDX/HDX LEDs
SPD/LNK/ACT LEDs
SFP port

Introduction 9
NOTE: Do not connect two switches together with more than one cable. Using multiple cables to
connect switches can create a loop and cause collisions.
Figure 1-4. Cascading Switches
Connecting Switches to Systems
By connecting a switch to systems, you can form a small network. To improve network efficiency,
use 1000-Mbps full-duplex operation between the server and switch if the LAN adapter on the
server can operate in full-duplex mode.
All the RJ-45 ports support Auto MDI/MDIX and therefore automatically detect the type of cable
used to connect the network device. Crossover or straight-through networking cables can be used
to connect PCs as well as other networking devices like hubs or routers to the switch. All ports on
the switch automatically negotiate speed and whether to operate in full duplex or half duplex.
Class-of-Service
The switch supports tag-based prioritization following the IEEE 802.1p standard. The eight levels
of IEEE 802.1p priority are mapped to the two priority queues of each port. For each port, the two
priority queues are scheduled following a Weighted Round Robin scheme.
NOTE: The IEEE 802.1p priority information is part of the IEEE 802.1q tag that also defines VLAN
memberships. The switches will ignore the VLAN membership information in the tag (that is, all ports are
part of all VLANs), but will preserve the full tag information—including packet priority and VLAN ID—
when transmitting the packet at the destination port.
Table 1-1. Tag-Based Prioritization
IEEE 802.1p Priority Priority Queue Scheduling Weight
0-3 0 1
4-7 1 2

10 Introduction
www.dell.com | support.dell.com
Mounting Kit Instructions
These switches come with mounting brackets and screws for rackmounting or wallmounting and
rubber feet for stationing on a flat surface.
Installing the Switch on a Flat Surface
The switch can be installed on any appropriate level surface that can safely support the weight of
the switches and their attached cables. There must be adequate space around the switch for
ventilation and access to cable connectors.
To install the switch on a flat surface, complete the following steps:
1 Set the switch on the flat surface and check for proper ventilation.
Allow at least 5.1 cm (2 inches) on each side for proper ventilation and 12.7 cm (5 inches) at
the back for power cable clearance.
2 Attach rubber feet on each marked location on the bottom of the chassis.
The rubber feet are optional, but are recommended to keep the switch from slipping.
Installing the Switch in a Rack
The switch can be installed in Dell PowerEdge™ racks, which are 48.3 cm (19 inches). It can also be
installed in most other standard 19-inch racks and most telco two-post racks.
NOTE: Do not install rubber feet on the switch if you are rackmounting the switch.
To install the switch in a rack, complete the following steps:
1 Use the supplied screws to attach a mounting bracket to each side of the switch (see
Figure 1-5).

Introduction 11
Figure 1-5. Brackets for Rack Installation
2
Install the cage nuts onto the mounting rails of your rack, if your rack requires them.
NOTE: Additional screws are provided for racks that have threaded mounting holes.
3 Position the switch in the rack and align the holes in the mounting bracket with the holes in
the rack.
4 Insert and tighten two screws appropriate for your rack through each of the mounting
brackets.
Installing the Switch on a Wall
To mount the switch on a wall, complete the following steps:
1 Ensure that the mounting point meets the following requirements:
• The wall surface must be capable of supporting the switch.
• Allow at least 5.1 cm (2 inches) on each side for proper ventilation and 12.7 cm (5 inches)
at the back for power cable clearance.
• The location must not be located in direct sunlight.
• The location must not be within 2 feet of any heating vents, nor should any area heating
vent point toward the unit.
• The location must be ventilated to prevent heat buildup.
• Do not locate the switch where there may be data or electrical cabling located directly
behind the unit.
• The power cable must reach an outlet.
2 Use the supplied screws to attach a mounting bracket to each side of the switch (see
Figure 1-6).

12 Introduction
www.dell.com | support.dell.com
Figure 1-6. Brackets for Wall Installation
3
Place the switch against the wall and mark the wall through the holes of the brackets.
4 Drill holes in the wall for the brackets and install the appropriate mounting hardware (not
supplied).
5 Place the against the wall so that the bracket holes align with the holes in the wall.
6 Insert and tighten the screws through each of the mounting brackets.
Technical Information
Table 1-2. Specifications
Network Protocol and Standards Compatibility
IEEE 802.3 CSMA/CD
IEEE 802.3 10Base-T
IEEE 802.3u 100Base-TX
IEEE 802.3z/ab 1000Base-T
IEEE 802.3x Flow Control
IEEE 802.3p Priority
Interface
RJ-45 connectors; one SFP connector available on 24-port switch
Power Supply
100–240 VAC/5060 Hz universal input

Introduction 13
Physical Dimensions
24-port switch 330 x 228 x 44 mm (W x D x H)
13 x 9 x 1.7 inches
16-port switch 330 x 228 x 44 mm (W x D x H)
13 x 9 x 1.7 inches
8-port switch 266 x 162 x 44 mm (W x D x H)
10.5 x 6.4 x 1.7 inches
Environmental Specifications
Operating temperature 0º to 40ºC (32º to 104ºF)
Storage temperature –20º to 70ºC (–4º to 158ºF)
Operating Humidity 10 to 90% RH
Storage Humidity 10 to 95% RH
Table 1-2. Specifications
(continued)

14 Introduction
www.dell.com | support.dell.com

Troubleshooting 15
2
Troubleshooting
This section provides troubleshooting information for your switch. Table 2-1 describes general
cluster problems you may encounter and the probable causes and solutions.
Table 2-1. Basic Troubleshooting
Problem Probable Cause Corrective Action
Power LED is not lighted. There is no power to the switch. Confirm that the switch is
connected to a properly
functioning and active power
source.
Ensure that the power cable is
securely connected to the switch
and to a power source.

16 Troubleshooting
www.dell.com | support.dell.com
Link LED is not lighted. The cable is not securely
connected to the switch or the
attached device.
Ensure that the connectors are
fully inserted into the ports of the
switch and the attached device.
The attached device is not
configured correctly, or it is not
powered on.
Ensure that the attached device is
powered on. Verify that the NIC
on the attached device is
operating properly.
The cable is damaged or not
properly terminated.
Test the cable.
Try a known working cable.
Ensure that the cables are
terminated using TIA 568A or
568B standards.
The cable’s maximum distance
has been exceeded.
10Base-T, 100Base-T, and
1000Base-T cables have
limitations for link lengths. Move
the connected device closer to the
switch and use a shorter cable.
Mismatched duplex mode. Ensure that all devices connected
to the switch are configured to
automatically detect and set port
speed and duplex settings.
Bad switch port. Reconnect the connector for the
affected link to a different switch
port.
Link speed LED indicates a lower
speed than expected.
Incorrect cable grade. Ensure that you are using
Category 5 cable or better for all
10Base-T and 100Base-T links, or
Category 5e for 1000Base-T links.
Damaged cable. Test any cables that have kinks,
sharp bends, or appear to be
damaged.
The cable’s maximum distance
has been exceeded.
10Base-T, 100Base-T, and
1000Base-T cables have
limitations for link lengths. Move
the connected device closer to the
switch and use a shorter cable.
Table 2-1. Basic Troubleshooting
(continued)
Problem Probable Cause Corrective Action

Troubleshooting 17
Link LED is lighted, but the
activity (ACT) LED does not
blink.
There is no Ethernet traffic on the
link. The LED blinks only when
traffic is being passed to or sent
from a device that is connected to
the port.
No action required.
The attached device is not
configured correctly.
Verify that the port or NIC on the
attached device is operating
properly.
Link LED is lighted and the
FDX/HDX LED blinks
occasionally.
This can be normal link activity.
Some collisions take place during
normal operation.
No action required.
Link LED is lighted and the
FDX/HDX LED blinks frequently.
Mismatched duplex mode. Ensure that any devices
connected to the switch are set to
automatically detect and set port
speed and duplex settings.
The link is reaching its maximum
capacity.
Resegment the network to
decrease the number of users on
the link.
Table 2-1. Basic Troubleshooting
(continued)
Problem Probable Cause Corrective Action

18 Troubleshooting
www.dell.com | support.dell.com

Getting Help 17
3
Getting Help
Technical Assistance
If you need assistance with a technical problem, use Dell's extensive suite of online services
available at Dell Support at
support.dell.com for help with installation and troubleshooting
procedures. For more information, see "Online Services."
If you cannot resolve the problem using the online services, call Dell for technical assistance. See
"Contacting Dell."
NOTE: Call technical support from a phone near or at the system so that technical support can assist you with
any necessary procedures.
NOTE: Dell’s Express Service Code system may not be available in all countries.
When prompted by Dell's automated telephone system, enter your Express Service Code to
route the call directly to the proper support personnel. If you do not have an Express Service
Code, open the
Dell Accessories folder, double-click the Express Service Code icon, and
follow the directions.
For instructions on using the technical support service, see "Technical Support Service" and
"Before You Call."
NOTE: Some of the following services are not always available in all locations outside the continental U.S. Call
your local Dell representative for information on availability.
Online Services
You can access Dell Support at support.dell.com . Select your region on the WELCOME TO
DELL SUPPORT
page, and fill in the requested details to access help tools and information.
You can contact Dell electronically using the following addresses:
•WorldWideWeb
www.dell.com/
www.dell.com/ap/
(Asian/Pacific countries only)
www.dell.com/jp (Japan only)
www.euro.dell.com (Europe only)

18 Getting Help
www.dell.com | support.dell.com
www.dell.com/la (Latin American countries)
www.dell.ca (Canada only)
• Anonymous file transfer protocol (FTP)
ftp.dell.com/
Log in as user:anonymous , and use your e-mail address as your password.
• Electronic Support Service
[email protected]
[email protected] (Asian/Pacific countries only)
support.jp.dell.com (Japan only)
support.euro.dell.com (Europe only)
• Electronic Quote Service
[email protected]
[email protected] (Asian/Pacific countries only)
[email protected] (Canada only)
• Electronic Information Service
[email protected]
AutoTech Service
Dell's automated technical support service—AutoTech—provides recorded answers to the
questions most frequently asked by Dell customers about their portable and desktop computer
systems.
When you call AutoTech, use your touch-tone telephone to select the subjects that correspond to
your questions.
The AutoTech service is available 24 hours a day, 7 days a week. You can also access this service
through the technical support service. See the contact information for your region.
Automated Order-Status Service
To check on the status of any Dell™ products that you have ordered, you can go to
support.dell.com , or you can call the automated order-status service. A recording prompts you for
the information needed to locate and report on your order. See the contact information for your
region.