3Com DUA1647-7AAA01 User Manual

SuperStack® 3 Baseline 8 Port Gigabit Switch
10BASE-T/100BASE-TX/1000BASE-T (3C16477) User Guide

DUA1647-7AAA01

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INTRODUCTION

The SuperStack® 3 Baseline 8 Port Gigabit Switch is a versatile,
easy-to-use switch. It is ideal for users who want the high-speed
performance of 10/100/1000 switching but do not need
sophisticated management capabilities. The Baseline 8 Port
Gigabit Switch is shipped ready for use. No configuration is
necessary.

The Baseline 8 Port Gigabit Switch can be rack-mounted or free
standing.

The Baseline 8 Port Gigabit Switch includes:

 One power cord
 One mounting kit
 Four standard height, self-adhesive rubber pads

The Switch is powered from the AC mains supply.

The Baseline 8 Port Gigabit Switch provides high performance
switched connections to 10 Mbps, 100 Mbps, and 1000 Mbps
hubs, switches, servers and workstations that need a dedicated
switched link. The following figure illustrates one possible
configuration. The Baseline 8 Port Gigabit Switch has 8 shielded
RJ-45, 10/100/1000 Mbps auto-negotiating ports on the front
panel. Each 10/100/1000 Mbps port automatically determines
the speed, duplex mode, and MDIX mode of the connected
equipment and provides a suitable switched connection. The
10/100 Mbps connections on these 1000BASE-T ports operate in
half or full duplex mode while the 1000 Mbps connections
operate in full duplex mode.

The Baseline 8 Port Gigabit Switch supports a maximum of 8192
MAC adddresses.

Baseline Dual Speed Hub
with 10/100 connection

Baseline 8 Port Gigabit Switch

Servers with
1000Mbps
connections

1000Mbps
connections

Baseline 10/100 Switch plus Gigabit

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F

EATURES OF THE

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B

ASELINE

8 P

ORT

G

IGABIT

S

WITCH

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The numbers in this diagram refer to numbered sections in the
text.

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Front Panel

1 8 RJ-45 10/100/1000 Ports

WARNING

sockets. They cannot be used as standard traditional
telephone sockets, or to connect the unit to a traditional
PBX or public telephone network. Only connect RJ-45
data connectors, network telephony systems, or network
telephones to these sockets. Either shielded or
unshielded data cables with shielded or unshielded jacks
can be connected to these data sockets.

AVERTISSEMENT: Les ports RJ-45. Ceux-ci sont

protégés par des prises de données. Ils ne peuvent pas
être utilisés comme prises de téléphone conventionnelles
standard, ni pour la connection de l’unité à un réseau
téléphonique central privé ou public. Raccorder
seulement connecteurs de données RJ-45, systèmes de
réseaux de téléphonie ou téléphones de réseaux à ces
prises. Il est possible de raccorder des câbles protégés ou
non protégés avec des jacks protégés ou non protégés à
ces prises de don.

WARNUNG: RJ-45-Porte. Diese Porte sind geschützte

Datensteckdosen. Sie dürfen weder wie normale
traditionelle Telefonsteckdosen noch für die Verbindung
der Einheit mit einem traditionellem privatem oder
öffentlichem Telefonnetzwerk gebraucht werden. Nur
RJ-45-Datenanscluße, Telefonnetzsysteme or
Netztelefone an diese Steckdosen anschließen. Entweder
geschützte oder ungeschützte Buchsen dürfen an diese
Datensteckdosen angeschlossen werden.

The Baseline 8 Port Gigabit Switch has 8 10/100/1000 Mbps
auto-negotiating ports. Each port automatically determines the
correct speed and duplex mode as one of the following:

 10BASE-T half duplex
 10BASE-T full duplex
 100BASE-TX half duplex
 100BASE-TX full duplex
 1000BASE-T full duplex

: RJ-45 ports. These are shielded RJ-45 data

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CAUTION: The Baseline 8 Port Gigabit Switch supports
full duplex auto-negotiation. If the connected device

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does not support auto-negotiation, the Switch will
operate in half duplex mode (only for 10BASE-T and
100BASE-TX). In such a configuration, you may notice
some degradation of network performance. 3Com
recommends that you use devices that are capable of
auto-negotiation (and that you ensure that
auto-negotiation is enabled, if it is a configurable
option).

All ports auto-sense an MDI/MDIX connection and can be used
to connect to either another switch port, server, or workstation
without additional configuration. Each port can be connected to
a device with a normal ‘straight through’ TP (twisted pair) cable
or a ‘cross-over’ TP cable.

Priority Queuing

The Switch offers priority queuing, which means all packets that
are received are examined to see if they have been priority
encoded. If a packet has been, then the Switch will read the
priority level and determine whether the packet should be
directed through the normal or high priority channel. This feature
can be useful for example during excessive loads when one type
of traffic may require priority over another. The Switch is
configured to comply with 802.1p, VLAN tagged frames.

Traffic prioritization ensures that high priority data is forwarded
through the Switch without being delayed by lower priority data.
It differentiates traffic into classes and prioritizes those classes
automatically. Traffic prioritization uses the multiple traffic queues
that are present in the hardware of the Switch to ensure that
high priority traffic is forwarded on a different queue from lower
priority traffic, and is given preference over that traffic. This
ensures that time-sensitive traffic gets the highest level of service.
The 802.1D standard specifies eight distinct levels of priority
(0 to 7), each of which relates to a particular type of traffic. The
priority levels and their traffic types are shown in the following
table.

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Priority Level Traffic Typ e

0 Best Effort

1 Background

2 Standard (spare)

3 Excellent Effort (business critical)

4 Controlled Load (streaming multimedia)

5 Video (Interactive media), less than 100 milliseconds

latency and jitter.

6 Voice (Interactive voice), less than 10 milliseconds

latency and jitter.

7 Network Control Reserved traffic

Duplex Status LEDs

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The second row of Status LEDs, which are colored yellow, show
the duplex status of the related ports:

Status Meaning

On Yellow The port is operating in full duplex mode.

Off The port is operating in half duplex mode.

1000BASE-T only operates in full duplex mode.
10BASE-T/100BASE-TX can be in half or full duplex
mode.

Power LED

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The traffic prioritization feature supported by the Switch
is compatible with the relevant sections of the IEEE

802.1D standard (incorporating IEEE 802.1p).

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Activity/Link/Speed Status LEDs

The top row of Status LEDs, labelled “Link/Activity,” show the
link and activity status of the related ports:

Status Meaning

On The link has been established.

Flashing Packets are being received or transmitted on the port.

Off If the link has not been established, either nothing is con-

Green The link is operating at 1000 Mbps.

Yellow The link is operating at 10 or 100 Mbps.

nected to the port, or there is a problem:

■ Check that the attached device is powered on.

■ Check that the cable is the correct type and is not faulty.

If these checks do not identify the cause of the problem, it
may be that the unit or the device connected to the port is
faulty. Contact your supplier for further advice.

INSTALLING THE SWITCH

Positioning the Switch

When deciding where to position the Baseline 8 Port Gigabit
Switch ensure:

 It is accessible and cables can be connected easily.
 Cabling is away from sources of electrical noise. These

include lift shafts, microwave ovens, and air conditioning
units. Electromagnetic fields can interfere with the signals on
copper cabling and introduce errors, therefore slowing down
your network.

 Water or moisture cannot enter the case of the unit.
 Air flow around the unit and through the vents in the side

of the case is not restricted (3Com recommends that you
provide a minimum of 25 mm (1 in.) clearance).

 The air is as free from dust as possible.
 Temperature operating limits are not likely to be exceeded. It

is recommended that the unit is installed in a clean, air
conditioned environment.

The Power LED shows the power status of the Switch:

Status Meaning

On Green The unit is powered on and ready for use.

Off ■ The unit is not receiving power:

■ Check that the power cord is connected correctly.

■ If the unit still does not operate, contact your supplier.

Rear Panel Connections

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The Baseline 8 Port Gigabit Switch automatically adjusts to the
supply voltage. Only use the power cord that is supplied with the
unit.

Rack Mounting or Free Standing

This unit can be mounted in a 19-inch equipment rack using the
Mounting Kit. Refer to “Mounting Kit Instructions” on page 4. It
can also be free standing. Do not place objects on top of the
unit or stack.

The unit is supplied with four self-adhesive rubber pads. If the
unit is to be part of a free standing stack, apply the pads to each
marked corner area on the underside of the unit. Place the unit
on top of the lower unit, ensuring that the pads locate with the
recesses of the lower unit.

Do not apply the pads if you intend to rack mount the
unit.

CAUTION: If installing the Baseline 8 Port Gigabit Switch
in a free standing stack of different size SuperStack II or
SuperStack 3 units, the smaller units must be installed
above the larger ones. Do not build a free standing
stack of more than six units.

It is always good practice to wear an anti-static wrist
strap when installing network equipment, connected to
a ground point. If one is not available, try to keep in
contact with a grounded rack and avoid touching the
unit's ports and connectors, if possible. Static discharge
can cause reliability problems in your equipment.

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